<br>I think Arlindo's comment on the use of MERRA or any reanalysis precipitation is spot on. I wanted to add that there is a lot of information on the MERRA web site about variables and how it is shaping both in climate and weather. This includes a frequently asked questions list, that can only grow if questions are asked!<br>
<br><a href="http://gmao.gsfc.nasa.gov/merra/">http://gmao.gsfc.nasa.gov/merra/</a><br><br>I also want to call out the File Specification document, which includes information on the grid and frequency of data, as well as the variable lists and discussion on the budgets. It is searchable PDF, so all the variables about a key word could be found. There are more than 300 variables across a dozen data collections.<br>
<br><a href="http://gmao.gsfc.nasa.gov/research/merra/file_specifications.php">http://gmao.gsfc.nasa.gov/research/merra/file_specifications.php</a><br><br>There is also an email for questions on MERRA that reaches model and data site developers, which helps because sometimes folks are out of town or not always available to respond. <br>
<br><a href="mailto:merra-questions@listserv.gsfc.nasa.gov">merra-questions@listserv.gsfc.nasa.gov</a> <br><br>Have a great weekend!!<br><br>Mike<br><br><div class="gmail_quote">On Thu, Jan 28, 2010 at 12:11 AM, Arlindo da Silva <span dir="ltr"><<a href="mailto:arlindo.dasilva@gmail.com">arlindo.dasilva@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br><br><div class="gmail_quote"><div class="im">On Wed, Jan 27, 2010 at 5:13 PM, Thiago Veloso <span dir="ltr"><<a href="mailto:thi_veloso@yahoo.com.br" target="_blank">thi_veloso@yahoo.com.br</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<table border="0" cellpadding="0" cellspacing="0"><tbody><tr><td style="font-family: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; font-size: inherit; line-height: inherit; font-size-adjust: inherit; font-stretch: inherit;" valign="top">
<div> Accordingly to this website (<a href="http://disc.sci.gsfc.nasa.gov/daac-bin/DataHoldings.pl" target="_blank">http://disc.sci.gsfc.nasa.gov/daac-bin/DataHoldings.pl</a>), there is no precipitation dataset on the listings.</div>
<div><br></div></td></tr></tbody></table></blockquote><div><br></div></div><div>MERRA's emphasis is on the hydrological cycle, therefore precipitation is a key parameter. If you have the opengrads bundle start</div><div>
<br>
</div><div>% merra</div><div><br></div><div>then click on the [Monthly]/[Surface Fluxes] and select any of the precipitation variables.</div><div class="im"><div> </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<table border="0" cellpadding="0" cellspacing="0"><tbody><tr><td style="font-family: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; font-size: inherit; line-height: inherit; font-size-adjust: inherit; font-stretch: inherit;" valign="top">
<div></div><div> However, I'd recommend you to look for precipitation data on GPCP, TRMM or CMORPH programs.</div><div>
<br></div></td></tr></tbody></table></blockquote><div><br></div></div><div>Precipitation from reanalyses are model derived parameters. Although MERRA precipitation has been evaluated against GPCP and other datasets, this is not a direct measurement. It is most useful in the context of the other climate parameters provided by MERRA.</div>
<div><br></div><div> Arlindo</div><div class="im"><div><br></div><div><br></div><div> </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<table border="0" cellpadding="0" cellspacing="0">
<tbody><tr><td style="font-family: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; font-size: inherit; line-height: inherit; font-size-adjust: inherit; font-stretch: inherit;" valign="top"><div>
</div><div> Best regards,</div><div><br></div><div> Thiago.</div><br>--- On <b>Wed, 27/1/10, Diego Souza <i><<a href="mailto:dsouza@CPTEC.INPE.BR" target="_blank">dsouza@CPTEC.INPE.BR</a>></i></b> wrote:<br>
<blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><br>From: Diego Souza <<a href="mailto:dsouza@CPTEC.INPE.BR" target="_blank">dsouza@CPTEC.INPE.BR</a>><br>Subject: Question about MERRA<div>
<br>To: <a href="mailto:GRADSUSR@LIST.CINECA.IT" target="_blank">GRADSUSR@LIST.CINECA.IT</a><br></div>Date: Wednesday, 27 January, 2010, 15:04<div><div></div><div><br><br><div>Hi,<div><br></div><div>I would like kown if have precipitation data in the MERRA
datasets.</div><div><br></div><div>Thanks,<br clear="all">_________________________________________<br><br>Diego Oliveira de Souza<br>Grupo de Estudos Ambientais Integrados (GEAI) <br>
Instituto Nacional de Pesquisas Espaciais - INPE<br>Cachoeira Paulista - SP<br>Fone: (12) 31869512<br>Cel: (12) 91219668<br>_________________________________________<br>
</div>
</div></div></div></blockquote></td></tr></tbody></table><br>
</blockquote></div></div><font color="#888888"><br><br clear="all"><br>-- <br>Arlindo da Silva<br><a href="mailto:dasilva@alum.mit.edu" target="_blank">dasilva@alum.mit.edu</a><br>
</font></blockquote></div><br>