Load and slice CMEMS adt

CMEMS_adt.ipynb

{
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  {
   "cell_type": "code",
   "execution_count": 1,
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   "outputs": [],
   "source": [
    "import xarray as xr\n",
    "import glob\n",
    "\n",
    "import dask\n",
    "from dask.distributed import Client"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
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       "    <div style=\"margin-left: 48px;\">\n",
       "        <h3 style=\"margin-bottom: 0px;\">Client</h3>\n",
       "        <p style=\"color: #9D9D9D; margin-bottom: 0px;\">Client-5422f926-2b27-11ec-9956-40f2e9c8cfce</p>\n",
       "        <table style=\"width: 100%; text-align: left;\">\n",
       "\n",
       "        <tr>\n",
       "        \n",
       "            <td style=\"text-align: left;\"><strong>Connection method:</strong> Cluster object</td>\n",
       "            <td style=\"text-align: left;\"><strong>Cluster type:</strong> distributed.LocalCluster</td>\n",
       "        \n",
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       "\n",
       "        \n",
       "            <tr>\n",
       "                <td style=\"text-align: left;\">\n",
       "                    <strong>Dashboard: </strong> <a href=\"/proxy/8787/status\" target=\"_blank\">/proxy/8787/status</a>\n",
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       "        \n",
       "            <details>\n",
       "            <summary style=\"margin-bottom: 20px;\"><h3 style=\"display: inline;\">Cluster Info</h3></summary>\n",
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       "        <h3 style=\"margin-bottom: 0px; margin-top: 0px;\">LocalCluster</h3>\n",
       "        <p style=\"color: #9D9D9D; margin-bottom: 0px;\">0970c12c</p>\n",
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       "                    <strong>Dashboard:</strong> <a href=\"/proxy/8787/status\" target=\"_blank\">/proxy/8787/status</a>\n",
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       "                <td style=\"text-align: left;\">\n",
       "                    <strong>Workers:</strong> 4\n",
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       "            <tr>\n",
       "                <td style=\"text-align: left;\">\n",
       "                    <strong>Total threads:</strong> 12\n",
       "                </td>\n",
       "                <td style=\"text-align: left;\">\n",
       "                    <strong>Total memory:</strong> 48.00 GiB\n",
       "                </td>\n",
       "            </tr>\n",
       "            \n",
       "            <tr>\n",
       "    <td style=\"text-align: left;\"><strong>Status:</strong> running</td>\n",
       "    <td style=\"text-align: left;\"><strong>Using processes:</strong> True</td>\n",
       "</tr>\n",
       "\n",
       "            \n",
       "        </table>\n",
       "\n",
       "        <details>\n",
       "            <summary style=\"margin-bottom: 20px;\">\n",
       "                <h3 style=\"display: inline;\">Scheduler Info</h3>\n",
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       "            <h3 style=\"margin-bottom: 0px;\">Scheduler</h3>\n",
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       "                    <td style=\"text-align: left;\">\n",
       "                        <strong>Comm:</strong> tcp://127.0.0.1:45333\n",
       "                    </td>\n",
       "                    <td style=\"text-align: left;\">\n",
       "                        <strong>Workers:</strong> 4\n",
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       "                        <strong>Dashboard:</strong> <a href=\"/proxy/8787/status\" target=\"_blank\">/proxy/8787/status</a>\n",
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       "                        <strong>Total threads:</strong> 12\n",
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       "                    <td style=\"text-align: left;\">\n",
       "                        <strong>Started:</strong> Just now\n",
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       "                        <strong>Total memory:</strong> 48.00 GiB\n",
       "                    </td>\n",
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       "\n",
       "    <details style=\"margin-left: 48px;\">\n",
       "        <summary style=\"margin-bottom: 20px;\">\n",
       "            <h3 style=\"display: inline;\">Workers</h3>\n",
       "        </summary>\n",
       "\n",
       "        \n",
       "        <div style=\"margin-bottom: 20px;\">\n",
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       "                <summary>\n",
       "                    <h4 style=\"margin-bottom: 0px; display: inline;\">Worker: 0</h4>\n",
       "                </summary>\n",
       "                <table style=\"width: 100%; text-align: left;\">\n",
       "                    <tr>\n",
       "                        <td style=\"text-align: left;\">\n",
       "                            <strong>Comm: </strong> tcp://10.6.121.4:39153\n",
       "                        </td>\n",
       "                        <td style=\"text-align: left;\">\n",
       "                            <strong>Total threads: </strong> 3\n",
       "                        </td>\n",
       "                    </tr>\n",
       "                    <tr>\n",
       "                        <td style=\"text-align: left;\">\n",
       "                            <strong>Dashboard: </strong> <a href=\"/proxy/40787/status\" target=\"_blank\">/proxy/40787/status</a>\n",
       "                        </td>\n",
       "                        <td style=\"text-align: left;\">\n",
       "                            <strong>Memory: </strong> 12.00 GiB\n",
       "                        </td>\n",
       "                    </tr>\n",
       "                    <tr>\n",
       "                        <td style=\"text-align: left;\">\n",
       "                            <strong>Nanny: </strong> tcp://127.0.0.1:37103\n",
       "                        </td>\n",
       "                        <td style=\"text-align: left;\"></td>\n",
       "                    </tr>\n",
       "                    <tr>\n",
       "                        <td colspan=\"2\" style=\"text-align: left;\">\n",
       "                            <strong>Local directory: </strong> /jobfs/29732753.gadi-pbs/dask-worker-space/worker-6i02xag2\n",
       "                        </td>\n",
       "                    </tr>\n",
       "\n",
       "                    \n",
       "\n",
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       "\n",
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       "                    <h4 style=\"margin-bottom: 0px; display: inline;\">Worker: 1</h4>\n",
       "                </summary>\n",
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       "                    <tr>\n",
       "                        <td style=\"text-align: left;\">\n",
       "                            <strong>Comm: </strong> tcp://10.6.121.4:39511\n",
       "                        </td>\n",
       "                        <td style=\"text-align: left;\">\n",
       "                            <strong>Total threads: </strong> 3\n",
       "                        </td>\n",
       "                    </tr>\n",
       "                    <tr>\n",
       "                        <td style=\"text-align: left;\">\n",
       "                            <strong>Dashboard: </strong> <a href=\"/proxy/42389/status\" target=\"_blank\">/proxy/42389/status</a>\n",
       "                        </td>\n",
       "                        <td style=\"text-align: left;\">\n",
       "                            <strong>Memory: </strong> 12.00 GiB\n",
       "                        </td>\n",
       "                    </tr>\n",
       "                    <tr>\n",
       "                        <td style=\"text-align: left;\">\n",
       "                            <strong>Nanny: </strong> tcp://127.0.0.1:36145\n",
       "                        </td>\n",
       "                        <td style=\"text-align: left;\"></td>\n",
       "                    </tr>\n",
       "                    <tr>\n",
       "                        <td colspan=\"2\" style=\"text-align: left;\">\n",
       "                            <strong>Local directory: </strong> /jobfs/29732753.gadi-pbs/dask-worker-space/worker-arhk4nfq\n",
       "                        </td>\n",
       "                    </tr>\n",
       "\n",
       "                    \n",
       "\n",
       "                    \n",
       "\n",
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       "                <summary>\n",
       "                    <h4 style=\"margin-bottom: 0px; display: inline;\">Worker: 2</h4>\n",
       "                </summary>\n",
       "                <table style=\"width: 100%; text-align: left;\">\n",
       "                    <tr>\n",
       "                        <td style=\"text-align: left;\">\n",
       "                            <strong>Comm: </strong> tcp://10.6.121.4:45707\n",
       "                        </td>\n",
       "                        <td style=\"text-align: left;\">\n",
       "                            <strong>Total threads: </strong> 3\n",
       "                        </td>\n",
       "                    </tr>\n",
       "                    <tr>\n",
       "                        <td style=\"text-align: left;\">\n",
       "                            <strong>Dashboard: </strong> <a href=\"/proxy/36787/status\" target=\"_blank\">/proxy/36787/status</a>\n",
       "                        </td>\n",
       "                        <td style=\"text-align: left;\">\n",
       "                            <strong>Memory: </strong> 12.00 GiB\n",
       "                        </td>\n",
       "                    </tr>\n",
       "                    <tr>\n",
       "                        <td style=\"text-align: left;\">\n",
       "                            <strong>Nanny: </strong> tcp://127.0.0.1:33471\n",
       "                        </td>\n",
       "                        <td style=\"text-align: left;\"></td>\n",
       "                    </tr>\n",
       "                    <tr>\n",
       "                        <td colspan=\"2\" style=\"text-align: left;\">\n",
       "                            <strong>Local directory: </strong> /jobfs/29732753.gadi-pbs/dask-worker-space/worker-oltymc5z\n",
       "                        </td>\n",
       "                    </tr>\n",
       "\n",
       "                    \n",
       "\n",
       "                    \n",
       "\n",
       "                </table>\n",
       "            </details>\n",
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       "        </div>\n",
       "        \n",
       "        <div style=\"margin-bottom: 20px;\">\n",
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       "            <div style=\"margin-left: 48px;\">\n",
       "            <details>\n",
       "                <summary>\n",
       "                    <h4 style=\"margin-bottom: 0px; display: inline;\">Worker: 3</h4>\n",
       "                </summary>\n",
       "                <table style=\"width: 100%; text-align: left;\">\n",
       "                    <tr>\n",
       "                        <td style=\"text-align: left;\">\n",
       "                            <strong>Comm: </strong> tcp://10.6.121.4:46475\n",
       "                        </td>\n",
       "                        <td style=\"text-align: left;\">\n",
       "                            <strong>Total threads: </strong> 3\n",
       "                        </td>\n",
       "                    </tr>\n",
       "                    <tr>\n",
       "                        <td style=\"text-align: left;\">\n",
       "                            <strong>Dashboard: </strong> <a href=\"/proxy/38421/status\" target=\"_blank\">/proxy/38421/status</a>\n",
       "                        </td>\n",
       "                        <td style=\"text-align: left;\">\n",
       "                            <strong>Memory: </strong> 12.00 GiB\n",
       "                        </td>\n",
       "                    </tr>\n",
       "                    <tr>\n",
       "                        <td style=\"text-align: left;\">\n",
       "                            <strong>Nanny: </strong> tcp://127.0.0.1:33943\n",
       "                        </td>\n",
       "                        <td style=\"text-align: left;\"></td>\n",
       "                    </tr>\n",
       "                    <tr>\n",
       "                        <td colspan=\"2\" style=\"text-align: left;\">\n",
       "                            <strong>Local directory: </strong> /jobfs/29732753.gadi-pbs/dask-worker-space/worker-gukwzf1h\n",
       "                        </td>\n",
       "                    </tr>\n",
       "\n",
       "                    \n",
       "\n",
       "                    \n",
       "\n",
       "                </table>\n",
       "            </details>\n",
       "            </div>\n",
       "        </div>\n",
       "        \n",
       "\n",
       "    </details>\n",
       "</div>\n",
       "\n",
       "        </details>\n",
       "    </div>\n",
       "</div>\n",
       "            </details>\n",
       "        \n",
       "\n",
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       "</div>"
      ],
      "text/plain": [
       "<Client: 'tcp://127.0.0.1:45333' processes=4 threads=12, memory=48.00 GiB>"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "from dask.distributed import Client\n",
    "client = Client()\n",
    "client"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Load raw data\n",
    "\n",
    "We load all raw satellite altimetry daily data from CMEMS."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
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       "</style><pre class='xr-text-repr-fallback'>&lt;xarray.Dataset&gt;\n",
       "Dimensions:         (time: 9928, longitude: 1440, bnds: 2, latitude: 720)\n",
       "Coordinates:\n",
       "  * time            (time) datetime64[ns] 1993-01-01 1993-01-02 ... 2020-03-07\n",
       "  * longitude       (longitude) float32 0.125 0.375 0.625 ... 359.4 359.6 359.9\n",
       "  * latitude        (latitude) float32 -89.88 -89.62 -89.38 ... 89.62 89.88\n",
       "Dimensions without coordinates: bnds\n",
       "Data variables:\n",
       "    longitude_bnds  (time, longitude, bnds) float32 dask.array&lt;chunksize=(365, 1440, 2), meta=np.ndarray&gt;\n",
       "    latitude_bnds   (time, latitude, bnds) float32 dask.array&lt;chunksize=(365, 720, 2), meta=np.ndarray&gt;\n",
       "    crs             (time) int32 1 1 1 1 1 1 1 1 1 1 1 ... 1 1 1 1 1 1 1 1 1 1 1\n",
       "    err             (time, latitude, longitude) float64 dask.array&lt;chunksize=(365, 720, 1440), meta=np.ndarray&gt;\n",
       "    adt             (time, latitude, longitude) float64 dask.array&lt;chunksize=(365, 720, 1440), meta=np.ndarray&gt;\n",
       "    ugos            (time, latitude, longitude) float64 dask.array&lt;chunksize=(365, 720, 1440), meta=np.ndarray&gt;\n",
       "    vgos            (time, latitude, longitude) float64 dask.array&lt;chunksize=(365, 720, 1440), meta=np.ndarray&gt;\n",
       "    sla             (time, latitude, longitude) float64 dask.array&lt;chunksize=(365, 720, 1440), meta=np.ndarray&gt;\n",
       "    ugosa           (time, latitude, longitude) float64 dask.array&lt;chunksize=(365, 720, 1440), meta=np.ndarray&gt;\n",
       "    vgosa           (time, latitude, longitude) float64 dask.array&lt;chunksize=(365, 720, 1440), meta=np.ndarray&gt;\n",
       "Attributes: (12/46)\n",
       "    CDI:                             Climate Data Interface version 1.9.8 (ht...\n",
       "    Conventions:                     CF-1.6\n",
       "    history:                         2019-01-17 16:58:51Z: Creation\n",
       "    source:                          Altimetry measurements\n",
       "    institution:                     CLS, CNES\n",
       "    Metadata_Conventions:            Unidata Dataset Discovery v1.0\n",
       "    ...                              ...\n",
       "    time_coverage_duration:          P1D\n",
       "    time_coverage_end:               1993-01-01T00:00:00Z\n",
       "    time_coverage_resolution:        P1D\n",
       "    time_coverage_start:             1993-01-01T00:00:00Z\n",
       "    title:                           DT merged all satellites Global Ocean Gr...\n",
       "    CDO:                             Climate Data Operators version 1.9.8 (ht...</pre><div class='xr-wrap' hidden><div class='xr-header'><div class='xr-obj-type'>xarray.Dataset</div></div><ul class='xr-sections'><li class='xr-section-item'><input id='section-8af603d1-a1d3-4c11-8e32-a20ade7322a8' class='xr-section-summary-in' type='checkbox' disabled ><label for='section-8af603d1-a1d3-4c11-8e32-a20ade7322a8' class='xr-section-summary'  title='Expand/collapse section'>Dimensions:</label><div class='xr-section-inline-details'><ul class='xr-dim-list'><li><span class='xr-has-index'>time</span>: 9928</li><li><span class='xr-has-index'>longitude</span>: 1440</li><li><span>bnds</span>: 2</li><li><span class='xr-has-index'>latitude</span>: 720</li></ul></div><div class='xr-section-details'></div></li><li class='xr-section-item'><input id='section-174c2e1e-a22e-41cf-b8ed-bac2e9e1416c' class='xr-section-summary-in' type='checkbox'  checked><label for='section-174c2e1e-a22e-41cf-b8ed-bac2e9e1416c' class='xr-section-summary' >Coordinates: <span>(3)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>time</span></div><div class='xr-var-dims'>(time)</div><div class='xr-var-dtype'>datetime64[ns]</div><div class='xr-var-preview xr-preview'>1993-01-01 ... 2020-03-07</div><input id='attrs-d2d1e29c-dbd9-46bb-9b68-c5aa0b51ce6a' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-d2d1e29c-dbd9-46bb-9b68-c5aa0b51ce6a' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-5c5b185e-dbab-4617-8639-84010ad26ca4' class='xr-var-data-in' type='checkbox'><label for='data-5c5b185e-dbab-4617-8639-84010ad26ca4' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>standard_name :</span></dt><dd>time</dd><dt><span>long_name :</span></dt><dd>Time</dd><dt><span>axis :</span></dt><dd>T</dd></dl></div><div class='xr-var-data'><pre>array([&#x27;1993-01-01T00:00:00.000000000&#x27;, &#x27;1993-01-02T00:00:00.000000000&#x27;,\n",
       "       &#x27;1993-01-03T00:00:00.000000000&#x27;, ..., &#x27;2020-03-05T00:00:00.000000000&#x27;,\n",
       "       &#x27;2020-03-06T00:00:00.000000000&#x27;, &#x27;2020-03-07T00:00:00.000000000&#x27;],\n",
       "      dtype=&#x27;datetime64[ns]&#x27;)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>longitude</span></div><div class='xr-var-dims'>(longitude)</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>0.125 0.375 0.625 ... 359.6 359.9</div><input id='attrs-997ed86e-0ede-4a5a-b3c1-d54492766eac' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-997ed86e-0ede-4a5a-b3c1-d54492766eac' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-0c5d44b1-e986-4b34-b0b1-07fa51ade7be' class='xr-var-data-in' type='checkbox'><label for='data-0c5d44b1-e986-4b34-b0b1-07fa51ade7be' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>standard_name :</span></dt><dd>longitude</dd><dt><span>long_name :</span></dt><dd>Longitude</dd><dt><span>units :</span></dt><dd>degrees_east</dd><dt><span>axis :</span></dt><dd>X</dd><dt><span>bounds :</span></dt><dd>longitude_bnds</dd></dl></div><div class='xr-var-data'><pre>array([1.25000e-01, 3.75000e-01, 6.25000e-01, ..., 3.59375e+02, 3.59625e+02,\n",
       "       3.59875e+02], dtype=float32)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>latitude</span></div><div class='xr-var-dims'>(latitude)</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>-89.88 -89.62 ... 89.62 89.88</div><input id='attrs-41c63e7c-8e99-4b6a-b06f-d52c5dfac8de' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-41c63e7c-8e99-4b6a-b06f-d52c5dfac8de' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-548ba947-06d8-4be2-ae3d-8bb6656e8fc6' class='xr-var-data-in' type='checkbox'><label for='data-548ba947-06d8-4be2-ae3d-8bb6656e8fc6' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>standard_name :</span></dt><dd>latitude</dd><dt><span>long_name :</span></dt><dd>Latitude</dd><dt><span>units :</span></dt><dd>degrees_north</dd><dt><span>axis :</span></dt><dd>Y</dd><dt><span>bounds :</span></dt><dd>latitude_bnds</dd></dl></div><div class='xr-var-data'><pre>array([-89.875, -89.625, -89.375, ...,  89.375,  89.625,  89.875],\n",
       "      dtype=float32)</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-c47b6a83-8d3e-4e5d-b049-33b4448cb510' class='xr-section-summary-in' type='checkbox'  checked><label for='section-c47b6a83-8d3e-4e5d-b049-33b4448cb510' class='xr-section-summary' >Data variables: <span>(10)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span>longitude_bnds</span></div><div class='xr-var-dims'>(time, longitude, bnds)</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>dask.array&lt;chunksize=(365, 1440, 2), meta=np.ndarray&gt;</div><input id='attrs-c4a21d51-77c5-4b44-bbbf-3fbcc7ea2121' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-c4a21d51-77c5-4b44-bbbf-3fbcc7ea2121' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-d077d7ce-b0a1-4577-ac36-ad79dbd9e227' class='xr-var-data-in' type='checkbox'><label for='data-d077d7ce-b0a1-4577-ac36-ad79dbd9e227' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><table>\n",
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       "                <tbody>\n",
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       "                        <th> Bytes </th>\n",
       "                        <td> 109.07 MiB </td>\n",
       "                        <td> 4.02 MiB </td>\n",
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       "                        <th> Shape </th>\n",
       "                        <td> (9928, 1440, 2) </td>\n",
       "                        <td> (366, 1440, 2) </td>\n",
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       "</table></div></li><li class='xr-var-item'><div class='xr-var-name'><span>crs</span></div><div class='xr-var-dims'>(time)</div><div class='xr-var-dtype'>int32</div><div class='xr-var-preview xr-preview'>1 1 1 1 1 1 1 1 ... 1 1 1 1 1 1 1 1</div><input id='attrs-68200485-0a18-445e-8fc5-436af5482081' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-68200485-0a18-445e-8fc5-436af5482081' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-6872faf7-aef9-4c45-a730-e8a7cbcac86a' class='xr-var-data-in' type='checkbox'><label for='data-6872faf7-aef9-4c45-a730-e8a7cbcac86a' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>comment :</span></dt><dd>This is a container variable that describes the grid_mapping used by the data in this file. This variable does not contain any data; only information about the geographic coordinate system.</dd><dt><span>grid_mapping_name :</span></dt><dd>latitude_longitude</dd><dt><span>inverse_flattening :</span></dt><dd>298.257</dd><dt><span>semi_major_axis :</span></dt><dd>6378136.3</dd></dl></div><div class='xr-var-data'><pre>array([1, 1, 1, ..., 1, 1, 1], dtype=int32)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span>err</span></div><div class='xr-var-dims'>(time, latitude, longitude)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>dask.array&lt;chunksize=(365, 720, 1440), meta=np.ndarray&gt;</div><input id='attrs-d6764ea6-f49e-4f34-a25e-0802cbff96dd' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-d6764ea6-f49e-4f34-a25e-0802cbff96dd' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-b97c8280-434f-435c-b7b9-2daa6ce59280' class='xr-var-data-in' type='checkbox'><label for='data-b97c8280-434f-435c-b7b9-2daa6ce59280' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>long_name :</span></dt><dd>Formal mapping error</dd><dt><span>units :</span></dt><dd>m</dd><dt><span>grid_mapping :</span></dt><dd>crs</dd><dt><span>comment :</span></dt><dd>The formal mapping error represents a purely theoretical mapping error. It mainly traduces errors induced by the constellation sampling capability and consistency with the spatial/temporal scales considered, as described in Le Traon et al (1998) or Ducet et al (2000)</dd></dl></div><div class='xr-var-data'><table>\n",
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       "</table></div></li><li class='xr-var-item'><div class='xr-var-name'><span>adt</span></div><div class='xr-var-dims'>(time, latitude, longitude)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>dask.array&lt;chunksize=(365, 720, 1440), meta=np.ndarray&gt;</div><input id='attrs-99f1cfe0-9f6f-4b1a-b33e-5167cda8087f' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-99f1cfe0-9f6f-4b1a-b33e-5167cda8087f' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-89506771-c2d7-4a17-9316-3308c45a3a91' class='xr-var-data-in' type='checkbox'><label for='data-89506771-c2d7-4a17-9316-3308c45a3a91' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>standard_name :</span></dt><dd>sea_surface_height_above_geoid</dd><dt><span>long_name :</span></dt><dd>Absolute dynamic topography</dd><dt><span>units :</span></dt><dd>m</dd><dt><span>grid_mapping :</span></dt><dd>crs</dd><dt><span>comment :</span></dt><dd>The absolute dynamic topography is the sea surface height above geoid; the adt is obtained as follows: adt=sla+mdt where mdt is the mean dynamic topography; see the product user manual for details</dd></dl></div><div class='xr-var-data'><table>\n",
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      "text/plain": [
       "<xarray.Dataset>\n",
       "Dimensions:         (time: 9928, longitude: 1440, bnds: 2, latitude: 720)\n",
       "Coordinates:\n",
       "  * time            (time) datetime64[ns] 1993-01-01 1993-01-02 ... 2020-03-07\n",
       "  * longitude       (longitude) float32 0.125 0.375 0.625 ... 359.4 359.6 359.9\n",
       "  * latitude        (latitude) float32 -89.88 -89.62 -89.38 ... 89.62 89.88\n",
       "Dimensions without coordinates: bnds\n",
       "Data variables:\n",
       "    longitude_bnds  (time, longitude, bnds) float32 dask.array<chunksize=(365, 1440, 2), meta=np.ndarray>\n",
       "    latitude_bnds   (time, latitude, bnds) float32 dask.array<chunksize=(365, 720, 2), meta=np.ndarray>\n",
       "    crs             (time) int32 1 1 1 1 1 1 1 1 1 1 1 ... 1 1 1 1 1 1 1 1 1 1 1\n",
       "    err             (time, latitude, longitude) float64 dask.array<chunksize=(365, 720, 1440), meta=np.ndarray>\n",
       "    adt             (time, latitude, longitude) float64 dask.array<chunksize=(365, 720, 1440), meta=np.ndarray>\n",
       "    ugos            (time, latitude, longitude) float64 dask.array<chunksize=(365, 720, 1440), meta=np.ndarray>\n",
       "    vgos            (time, latitude, longitude) float64 dask.array<chunksize=(365, 720, 1440), meta=np.ndarray>\n",
       "    sla             (time, latitude, longitude) float64 dask.array<chunksize=(365, 720, 1440), meta=np.ndarray>\n",
       "    ugosa           (time, latitude, longitude) float64 dask.array<chunksize=(365, 720, 1440), meta=np.ndarray>\n",
       "    vgosa           (time, latitude, longitude) float64 dask.array<chunksize=(365, 720, 1440), meta=np.ndarray>\n",
       "Attributes: (12/46)\n",
       "    CDI:                             Climate Data Interface version 1.9.8 (ht...\n",
       "    Conventions:                     CF-1.6\n",
       "    history:                         2019-01-17 16:58:51Z: Creation\n",
       "    source:                          Altimetry measurements\n",
       "    institution:                     CLS, CNES\n",
       "    Metadata_Conventions:            Unidata Dataset Discovery v1.0\n",
       "    ...                              ...\n",
       "    time_coverage_duration:          P1D\n",
       "    time_coverage_end:               1993-01-01T00:00:00Z\n",
       "    time_coverage_resolution:        P1D\n",
       "    time_coverage_start:             1993-01-01T00:00:00Z\n",
       "    title:                           DT merged all satellites Global Ocean Gr...\n",
       "    CDO:                             Climate Data Operators version 1.9.8 (ht..."
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     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# the CMEMS (observations, satellite altimetry)\n",
    "\n",
    "# load the daily gridded CMEMS; this product is at /g/data/ua8/CMEMS_SeaLevel in Australia's HPC @ NCI|\n",
    "filenames = glob.glob(\"/g/data/ua8/CMEMS_SeaLevel/timeseries/*.nc\")\n",
    "\n",
    "cmems = xr.open_mfdataset(filenames, parallel=True)\n",
    "\n",
    "cmems"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Now from the dataset above we only pick out `adt`."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
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       "</style><pre class='xr-text-repr-fallback'>&lt;xarray.DataArray &#x27;adt_cmems&#x27; (time: 9928, latitude: 720, longitude: 1440)&gt;\n",
       "dask.array&lt;rechunk-merge, shape=(9928, 720, 1440), dtype=float64, chunksize=(73, 240, 480), chunktype=numpy.ndarray&gt;\n",
       "Coordinates:\n",
       "  * time       (time) datetime64[ns] 1993-01-01 1993-01-02 ... 2020-03-07\n",
       "  * longitude  (longitude) float32 0.125 0.375 0.625 0.875 ... 359.4 359.6 359.9\n",
       "  * latitude   (latitude) float32 -89.88 -89.62 -89.38 ... 89.38 89.62 89.88\n",
       "Attributes:\n",
       "    standard_name:  sea_surface_height_above_geoid\n",
       "    long_name:      Absolute dynamic topography\n",
       "    units:          m\n",
       "    grid_mapping:   crs\n",
       "    comment:        The absolute dynamic topography is the sea surface height...</pre><div class='xr-wrap' hidden><div class='xr-header'><div class='xr-obj-type'>xarray.DataArray</div><div class='xr-array-name'>'adt_cmems'</div><ul class='xr-dim-list'><li><span class='xr-has-index'>time</span>: 9928</li><li><span class='xr-has-index'>latitude</span>: 720</li><li><span class='xr-has-index'>longitude</span>: 1440</li></ul></div><ul class='xr-sections'><li class='xr-section-item'><div class='xr-array-wrap'><input id='section-7907991a-5786-4994-a8db-15ecc793acf8' class='xr-array-in' type='checkbox' checked><label for='section-7907991a-5786-4994-a8db-15ecc793acf8' title='Show/hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-array-preview xr-preview'><span>dask.array&lt;chunksize=(73, 240, 480), meta=np.ndarray&gt;</span></div><div class='xr-array-data'><table>\n",
       "    <tr>\n",
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       "                <tbody>\n",
       "                    \n",
       "                    <tr>\n",
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       "                        <td> 76.69 GiB </td>\n",
       "                        <td> 64.16 MiB </td>\n",
       "                    </tr>\n",
       "                    \n",
       "                    <tr>\n",
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       "                        <td> (9928, 720, 1440) </td>\n",
       "                        <td> (73, 240, 480) </td>\n",
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       "                    <tr>\n",
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       "                        <td> 1224 Chunks </td>\n",
       "                    </tr>\n",
       "                    <tr>\n",
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       "       &#x27;1993-01-03T00:00:00.000000000&#x27;, ..., &#x27;2020-03-05T00:00:00.000000000&#x27;,\n",
       "       &#x27;2020-03-06T00:00:00.000000000&#x27;, &#x27;2020-03-07T00:00:00.000000000&#x27;],\n",
       "      dtype=&#x27;datetime64[ns]&#x27;)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>longitude</span></div><div class='xr-var-dims'>(longitude)</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>0.125 0.375 0.625 ... 359.6 359.9</div><input id='attrs-a7fb79c4-4751-48c5-9081-03753f17e2a9' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-a7fb79c4-4751-48c5-9081-03753f17e2a9' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-7af146d9-a52f-4518-8357-200b293e9a5e' class='xr-var-data-in' type='checkbox'><label for='data-7af146d9-a52f-4518-8357-200b293e9a5e' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>standard_name :</span></dt><dd>longitude</dd><dt><span>long_name :</span></dt><dd>Longitude</dd><dt><span>units :</span></dt><dd>degrees_east</dd><dt><span>axis :</span></dt><dd>X</dd><dt><span>bounds :</span></dt><dd>longitude_bnds</dd></dl></div><div class='xr-var-data'><pre>array([1.25000e-01, 3.75000e-01, 6.25000e-01, ..., 3.59375e+02, 3.59625e+02,\n",
       "       3.59875e+02], dtype=float32)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>latitude</span></div><div class='xr-var-dims'>(latitude)</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>-89.88 -89.62 ... 89.62 89.88</div><input id='attrs-3e96cd47-4cbb-47ef-a060-659e03d9cba5' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-3e96cd47-4cbb-47ef-a060-659e03d9cba5' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-441e2a24-895d-407d-9e13-f00046201bef' class='xr-var-data-in' type='checkbox'><label for='data-441e2a24-895d-407d-9e13-f00046201bef' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>standard_name :</span></dt><dd>latitude</dd><dt><span>long_name :</span></dt><dd>Latitude</dd><dt><span>units :</span></dt><dd>degrees_north</dd><dt><span>axis :</span></dt><dd>Y</dd><dt><span>bounds :</span></dt><dd>latitude_bnds</dd></dl></div><div class='xr-var-data'><pre>array([-89.875, -89.625, -89.375, ...,  89.375,  89.625,  89.875],\n",
       "      dtype=float32)</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-e71c4b82-9242-4e7b-9961-20e0513e2060' class='xr-section-summary-in' type='checkbox'  checked><label for='section-e71c4b82-9242-4e7b-9961-20e0513e2060' class='xr-section-summary' >Attributes: <span>(5)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>standard_name :</span></dt><dd>sea_surface_height_above_geoid</dd><dt><span>long_name :</span></dt><dd>Absolute dynamic topography</dd><dt><span>units :</span></dt><dd>m</dd><dt><span>grid_mapping :</span></dt><dd>crs</dd><dt><span>comment :</span></dt><dd>The absolute dynamic topography is the sea surface height above geoid; the adt is obtained as follows: adt=sla+mdt where mdt is the mean dynamic topography; see the product user manual for details</dd></dl></div></li></ul></div></div>"
      ],
      "text/plain": [
       "<xarray.DataArray 'adt_cmems' (time: 9928, latitude: 720, longitude: 1440)>\n",
       "dask.array<rechunk-merge, shape=(9928, 720, 1440), dtype=float64, chunksize=(73, 240, 480), chunktype=numpy.ndarray>\n",
       "Coordinates:\n",
       "  * time       (time) datetime64[ns] 1993-01-01 1993-01-02 ... 2020-03-07\n",
       "  * longitude  (longitude) float32 0.125 0.375 0.625 0.875 ... 359.4 359.6 359.9\n",
       "  * latitude   (latitude) float32 -89.88 -89.62 -89.38 ... 89.38 89.62 89.88\n",
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       "    long_name:      Absolute dynamic topography\n",
       "    units:          m\n",
       "    grid_mapping:   crs\n",
       "    comment:        The absolute dynamic topography is the sea surface height..."
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# adt CMEMS (observations, satellite altimetry)\n",
    "\n",
    "adt = cmems.adt\n",
    "adt = adt.sel(time=slice('1993-01', None))\n",
    "adt = adt.chunk(chunks='auto')\n",
    "adt = adt.rename('adt_cmems')\n",
    "adt"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "We can slice the data and only keep, e.g., anything below 30S, with"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
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       "  <line x1=\"50\" y1=\"0\" x2=\"121\" y2=\"70\" style=\"stroke-width:2\" />\n",
       "\n",
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       "\n",
       "  <!-- Horizontal lines -->\n",
       "  <line x1=\"80\" y1=\"70\" x2=\"121\" y2=\"70\" style=\"stroke-width:2\" />\n",
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       "\n",
       "  <!-- Vertical lines -->\n",
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       "  <line x1=\"107\" y1=\"70\" x2=\"107\" y2=\"100\" />\n",
       "  <line x1=\"121\" y1=\"70\" x2=\"121\" y2=\"100\" style=\"stroke-width:2\" />\n",
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       "</svg>\n",
       "        </td>\n",
       "    </tr>\n",
       "</table></div></div></li><li class='xr-section-item'><input id='section-3da9f556-a38d-4569-ad04-4e5424855a54' class='xr-section-summary-in' type='checkbox'  checked><label for='section-3da9f556-a38d-4569-ad04-4e5424855a54' class='xr-section-summary' >Coordinates: <span>(3)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>time</span></div><div class='xr-var-dims'>(time)</div><div class='xr-var-dtype'>datetime64[ns]</div><div class='xr-var-preview xr-preview'>1993-01-01 ... 2020-03-07</div><input id='attrs-05e79c19-3ef5-4d25-b071-5aed6df26889' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-05e79c19-3ef5-4d25-b071-5aed6df26889' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-31b0c9ff-bcfa-47d0-9fab-7a805c8f2cda' class='xr-var-data-in' type='checkbox'><label for='data-31b0c9ff-bcfa-47d0-9fab-7a805c8f2cda' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>standard_name :</span></dt><dd>time</dd><dt><span>long_name :</span></dt><dd>Time</dd><dt><span>axis :</span></dt><dd>T</dd></dl></div><div class='xr-var-data'><pre>array([&#x27;1993-01-01T00:00:00.000000000&#x27;, &#x27;1993-01-02T00:00:00.000000000&#x27;,\n",
       "       &#x27;1993-01-03T00:00:00.000000000&#x27;, ..., &#x27;2020-03-05T00:00:00.000000000&#x27;,\n",
       "       &#x27;2020-03-06T00:00:00.000000000&#x27;, &#x27;2020-03-07T00:00:00.000000000&#x27;],\n",
       "      dtype=&#x27;datetime64[ns]&#x27;)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>longitude</span></div><div class='xr-var-dims'>(longitude)</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>0.125 0.375 0.625 ... 359.6 359.9</div><input id='attrs-8b638f58-5b67-43f7-b4a7-0b9b743753d1' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-8b638f58-5b67-43f7-b4a7-0b9b743753d1' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-4ca32634-fea9-45d8-81fc-d03a9350fdc2' class='xr-var-data-in' type='checkbox'><label for='data-4ca32634-fea9-45d8-81fc-d03a9350fdc2' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>standard_name :</span></dt><dd>longitude</dd><dt><span>long_name :</span></dt><dd>Longitude</dd><dt><span>units :</span></dt><dd>degrees_east</dd><dt><span>axis :</span></dt><dd>X</dd><dt><span>bounds :</span></dt><dd>longitude_bnds</dd></dl></div><div class='xr-var-data'><pre>array([1.25000e-01, 3.75000e-01, 6.25000e-01, ..., 3.59375e+02, 3.59625e+02,\n",
       "       3.59875e+02], dtype=float32)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>latitude</span></div><div class='xr-var-dims'>(latitude)</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>-89.88 -89.62 ... -30.38 -30.12</div><input id='attrs-264479d6-bc75-43f2-8efd-f48bb157635a' class='xr-var-attrs-in' type='checkbox' ><label for='attrs-264479d6-bc75-43f2-8efd-f48bb157635a' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-87b044d2-0f59-40c5-9515-9c07eecf2854' class='xr-var-data-in' type='checkbox'><label for='data-87b044d2-0f59-40c5-9515-9c07eecf2854' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'><dt><span>standard_name :</span></dt><dd>latitude</dd><dt><span>long_name :</span></dt><dd>Latitude</dd><dt><span>units :</span></dt><dd>degrees_north</dd><dt><span>axis :</span></dt><dd>Y</dd><dt><span>bounds :</span></dt><dd>latitude_bnds</dd></dl></div><div class='xr-var-data'><pre>array([-89.875, -89.625, -89.375, ..., -30.625, -30.375, -30.125],\n",
       "      dtype=float32)</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-94bea6e1-9360-4cc8-ae40-ac93abd5ca45' class='xr-section-summary-in' type='checkbox'  checked><label for='section-94bea6e1-9360-4cc8-ae40-ac93abd5ca45' class='xr-section-summary' >Attributes: <span>(5)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>standard_name :</span></dt><dd>sea_surface_height_above_geoid</dd><dt><span>long_name :</span></dt><dd>Absolute dynamic topography</dd><dt><span>units :</span></dt><dd>m</dd><dt><span>grid_mapping :</span></dt><dd>crs</dd><dt><span>comment :</span></dt><dd>The absolute dynamic topography is the sea surface height above geoid; the adt is obtained as follows: adt=sla+mdt where mdt is the mean dynamic topography; see the product user manual for details</dd></dl></div></li></ul></div></div>"
      ],
      "text/plain": [
       "<xarray.DataArray 'adt_cmems' (time: 9928, latitude: 240, longitude: 1440)>\n",
       "dask.array<getitem, shape=(9928, 240, 1440), dtype=float64, chunksize=(73, 240, 480), chunktype=numpy.ndarray>\n",
       "Coordinates:\n",
       "  * time       (time) datetime64[ns] 1993-01-01 1993-01-02 ... 2020-03-07\n",
       "  * longitude  (longitude) float32 0.125 0.375 0.625 0.875 ... 359.4 359.6 359.9\n",
       "  * latitude   (latitude) float32 -89.88 -89.62 -89.38 ... -30.62 -30.38 -30.12\n",
       "Attributes:\n",
       "    standard_name:  sea_surface_height_above_geoid\n",
       "    long_name:      Absolute dynamic topography\n",
       "    units:          m\n",
       "    grid_mapping:   crs\n",
       "    comment:        The absolute dynamic topography is the sea surface height..."
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "adt = adt.sel(latitude=slice(None, -30))\n",
    "adt"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Packages used in notebook"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [],
   "source": [
    "%load_ext watermark"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "xarray: 0.19.0\n",
      "dask  : 2021.9.1\n",
      "\n"
     ]
    }
   ],
   "source": [
    "%watermark --iversions"
   ]
  }
 ],
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