On Sun, Sep 18, 2011 at 2:39 PM, Mubashar Dogar <span dir="ltr"><<a href="mailto:mubashardogar@gmail.com">mubashardogar@gmail.com</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div dir="ltr"><br><div class="gmail_quote"><div dir="ltr"><div class="gmail_quote"><div dir="ltr">Dear GrADS users,<br><div class="gmail_quote"><div dir="ltr"><div class="gmail_quote"><div dir="ltr"><div class="gmail_quote">
<div dir="ltr"><br>I am facing a problem with time steps of a netcdf file downloaded for synoptic monthly means of ECMWF ERA-INTERIM forecast product for the year 1989 (downloaded for surface total precipitation for all time steps available from: <a href="http://data-portal.ecmwf.int/data/d/interim_mnth/" target="_blank">http://data-portal.ecmwf.int/data/d/interim_mnth/</a>). This file is basically synoptic monthly means generated by long term average of corresponding 3 hour in all the days of a month, giving 8 time steps in a month. So instead of reading 96 values that represents to 12 months (8 values in each months) GrADS read all these values by considering 8 time steps in a day instead in a month. I mean GrADS reads these hours in a daily format instead of monthly. Does GrADS not deal with synoptic monthly means? I have grib file as well for the same data, what should be time increment in a ctl file to open the same grib file?<div>
<br></div></div></div></div></div></div></div></div></div></div></div></div></blockquote><div><br></div><div>One strategy is to use the ensemble dimension to deal with the fact that you have 2 time scales involved. For example, you you associate each month with the grads time dimension and each "time of the day" with the grads ensemble dimension. (Or you can swap these if you prefer.) This recipe discusses how this can be done for the MERRA monthly diurnal files.</div>
<div><br></div><div><a href="http://cookbooks.opengrads.org/index.php?title=Recipe-024:_Using_the_Ensemble_Dimension_with_Monthly_Mean_Diurnal_files_from_MERRA">http://cookbooks.opengrads.org/index.php?title=Recipe-024:_Using_the_Ensemble_Dimension_with_Monthly_Mean_Diurnal_files_from_MERRA</a></div>
<div><br></div><div> Arlindo</div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div dir="ltr"><div class="gmail_quote"><div dir="ltr"><div class="gmail_quote"><div dir="ltr"><div class="gmail_quote"><div dir="ltr"><div class="gmail_quote"><div dir="ltr"><div class="gmail_quote"><div dir="ltr"><div><font color="#888888"><font color="#888888"><br>
Mubashar Dogar<br>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br>Arlindo da Silva<br><a href="mailto:dasilva@alum.mit.edu">dasilva@alum.mit.edu</a><br>