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<div>Dear grads user.</div>
<div> </div>
<div>I´m Davide Tononi and i'm doing some research about moisture on structure. For that i need the precipitation data for some cities in different part of Europe.</div>
<div>For the data of precipitation i download from the web page: <a href="http://data-portal.ecmwf.int/data/d/interim_daily"><font color="#0000FF"><u>http://data-portal.ecmwf.int/data/d/interim_daily</u></font></a> the data of total precipitation.</div>
<div>This data are every 12 hours so 2 times for day and is the sum of the 12 previous hours.</div>
<div>I've tried to compare this data, downloaded with step 3, with the data of metereological observation and the situation is like this:</div>
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<td> </td>
<td><font face="Times New Roman, serif" size="3">city</font></td>
<td><font face="Times New Roman, serif" size="3">Average temperature [ºC]</font></td>
<td><font face="Times New Roman, serif" size="3">Average RH [%]</font></td>
<td><font face="Times New Roman, serif" size="3">Annual precipitation from INTERIM [mm]</font></td>
<td><font face="Times New Roman, serif" size="3">Annual precipitation [mm] from observation</font></td>
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<tr>
<td><font face="Times New Roman, serif" size="3">B</font></td>
<td><font face="Times New Roman, serif" size="3">Florence</font></td>
<td><font face="Times New Roman, serif" size="3">13.7</font></td>
<td><font face="Times New Roman, serif" size="3">76</font></td>
<td><font face="Times New Roman, serif" size="3">386</font></td>
<td><font face="Times New Roman, serif" size="3">920</font></td>
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<tr>
<td><font face="Times New Roman, serif" size="3">C</font></td>
<td><font face="Times New Roman, serif" size="3">Helsinki</font></td>
<td><font face="Times New Roman, serif" size="3">6.3</font></td>
<td><font face="Times New Roman, serif" size="3">83</font></td>
<td><font face="Times New Roman, serif" size="3">293</font></td>
<td><font face="Times New Roman, serif" size="3">653</font></td>
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<div> Do you know how is possible this difference?</div>
<div>I've tried also to download the data with step 6 and in this case for the city of helsinki the situation change but now is bigger than in the real situation.</div>
<table border="1" width="771" style="border:1 solid; border-collapse:collapse; margin-left: -5pt; ">
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<col width="119">
<col width="119">
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<col width="154">
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<td> </td>
<td><font face="Times New Roman, serif" size="3">city</font></td>
<td><font face="Times New Roman, serif" size="3">Average temperature [ºC]</font></td>
<td><font face="Times New Roman, serif" size="3">Average RH [%]</font></td>
<td><font face="Times New Roman, serif" size="3">Annual precipitation from INTERIM [mm]</font></td>
<td><font face="Times New Roman, serif" size="3">Annual precipitation [mm] from observation</font></td>
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<td><font face="Times New Roman, serif" size="3">C</font></td>
<td><font face="Times New Roman, serif" size="3">Helsinki</font></td>
<td><font face="Times New Roman, serif" size="3">6.3</font></td>
<td><font face="Times New Roman, serif" size="3">83</font></td>
<td><font face="Times New Roman, serif" size="3">1380</font></td>
<td><font face="Times New Roman, serif" size="3">653</font></td>
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</table>
<div>And if i sum al the precipitation for 10 years for different cities in Europe the sum are very close each other for different cities.</div>
<div> </div>
<div>So some of you can explain to me the meaning of the step? Some of you have already use that data and can explain better how is the meaning of this total precipitation?</div>
<div> </div>
<div>Thank you so much</div>
<div>Best regards</div>
<div> </div>
<div>Davide Tononi</div>
<div>VTT researcher</div>
<div> </div>
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