mirror of https://github.com/ecmwf/eccodes.git
168 lines
6.1 KiB
HTML
168 lines
6.1 KiB
HTML
<p>For instantaneous fields, a monthly mean is the mean of the
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fields sampled at
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the specified averaging period. </p>
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<p>For accumulated fields, a monthly mean is the mean rate of
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accumulation of the
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fields. </p>
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<p>
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<table border="3">
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<tbody>
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<tr>
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<th> KSEC1 element</th>
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<th> Contents</th>
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<th> GRIB octet</th>
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<th style="vertical-align: top; text-align: center;">Recommended
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GRIB_API keys</th>
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<th style="vertical-align: top; text-align: center;">Coded
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GRIB_API keys</th>
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<th style="vertical-align: top; text-align: center;">Comments</th>
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</tr>
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<tr>
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<td> 37</td>
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<td>
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<pre>ECMWF local GRIB use definition identifier.<br>16 = ECMWF seasonal forecast monthly mean data</pre>
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</td>
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<td> 41</td>
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<th style="vertical-align: top; text-align: left;">localDefinitionNumber</th>
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<td style="vertical-align: top;">localDefinitionNumber</td>
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<td style="vertical-align: top;"><br>
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</td>
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</tr>
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<tr>
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<td>38</td>
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<td><a
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href="http://www.ecmwf.int/services/archive/d/table/grib_class/">Class</a></td>
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<td>42</td>
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<th style="vertical-align: top; text-align: left;">class</th>
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<td style="vertical-align: top;">marsClass</td>
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<td style="vertical-align: top;"><br>
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</td>
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</tr>
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<tr>
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<td>39</td>
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<td><a
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href="http://www.ecmwf.int/services/archive/d/table/grib_type/">Type</a></td>
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<td>43</td>
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<th style="vertical-align: top; text-align: left;">type</th>
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<td style="vertical-align: top;">marsType</td>
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<td style="vertical-align: top;"><br>
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</td>
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</tr>
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<tr>
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<td>40</td>
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<td><a
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href="http://www.ecmwf.int/services/archive/d/table/grib_stream/">Stream</a></td>
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<td>44-45</td>
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<th style="vertical-align: top; text-align: left;">stream</th>
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<td style="vertical-align: top;">marsStream</td>
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<td style="vertical-align: top;"><br>
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</td>
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</tr>
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<tr>
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<td>41</td>
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<td>
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<pre>Version number or experiment identifier.<br>(4 ASCII characters, right justified)</pre>
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</td>
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<td>46-49</td>
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<th style="vertical-align: top; text-align: left;">expver</th>
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<td style="vertical-align: top;">experimentVersionNumber</td>
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<td style="vertical-align: top;"><br>
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</td>
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</tr>
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<tr>
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<td> 42</td>
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<td>
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<pre>Number<br> Ensemble member number.<br> Control forecast is number 0,<br> perturbed forecasts 1-nn.<br> </pre>
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</td>
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<td> 50-51</td>
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<th style="vertical-align: top; text-align: left;">number<br>
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</th>
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<td style="vertical-align: top;">perturbationNumber<br>
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</td>
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<td style="vertical-align: top;"><br>
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</td>
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</tr>
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<tr>
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<td> 43</td>
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<td> Zero </td>
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<td> -</td>
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<th style="vertical-align: top; text-align: left;"><br>
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</th>
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<td style="vertical-align: top;"><br>
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</td>
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<td style="vertical-align: top;"><br>
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</td>
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</tr>
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<tr>
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<td> 44</td>
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<td>
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<pre>System number<br> The "scientific version" number.<br> 0 = RD experiment<br> 1 - 65534 = operational version number<br> 65535 = missing </pre>
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</td>
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<td> 52-53</td>
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<th style="vertical-align: top; text-align: left;">system<br>
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</th>
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<td style="vertical-align: top;">systemNumber<br>
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</td>
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<td style="vertical-align: top;"><br>
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</td>
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</tr>
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<tr>
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<td> 45</td>
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<td>
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<pre>Method number<br> Distinguishes scientifically different forecast ensembles<br> (eg different calibration/bias correction)<br> 0 = control integration (ie without data assimilation)<br> 1 - 65534 = operational version number<br> </pre>
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</td>
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<td> 54-55</td>
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<th style="vertical-align: top; text-align: left;">method<br>
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</th>
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<td style="vertical-align: top;">methodNumber<br>
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</td>
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<td style="vertical-align: top;"><br>
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</td>
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</tr>
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<tr>
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<td> 46</td>
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<td> Verifying month (in format YYYYMM)</td>
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<td> 56-59</td>
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<th style="vertical-align: top; text-align: left;">verifyingMonth<br>
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</th>
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<td style="vertical-align: top;">verifyingMonth<br>
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</td>
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<td style="vertical-align: top;"><br>
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</td>
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</tr>
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<tr>
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<td> 47</td>
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<td> Averaging period (eg 6-hour, 24-hour)</td>
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<td> 60</td>
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<th style="vertical-align: top; text-align: left;">averagingPeriod<br>
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</th>
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<td style="vertical-align: top;">averagingPeriod<br>
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</td>
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<td style="vertical-align: top;"><br>
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</td>
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</tr>
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<tr>
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<td>48</td>
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<td>Forecast month</td>
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<td>61-62</td>
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<th style="vertical-align: top; text-align: left;">forecastMonth<br>
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</th>
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<td style="vertical-align: top;">forecastMonth<br>
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</td>
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<td style="vertical-align: top;"><br>
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</td>
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</tr>
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<tr>
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<td> -</td>
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<td> Spare (set to zero)</td>
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<td> 63-80</td>
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<th style="vertical-align: top; text-align: left;"><br>
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</th>
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<td style="vertical-align: top;"><br>
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</td>
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<td style="vertical-align: top;"><br>
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</td>
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</tr>
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</tbody>
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</table>
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