[gradsusr] Reanalysis Question

[Mike Bosilovich]

Yes, The GEOS5 output diagnostics for the MERRA data do not extrapolate
data for pressure levels greater than the surface pressure, near
topography. Care must be taken when comparing MERRA to other data that do
extrapolate underground.

http://gmao.gsfc.nasa.gov/research/merra/pressure_surface.php

There is a third party routine to fill those data:

https://reanalyses.org/atmosphere/extrapolation-merra-reanalyses-obtain-continuous-fields

Mike




On Fri, Apr 5, 2013 at 9:51 AM, avi kojokro <kojokroavi at gmail.com> wrote:

> HI mike
>
> Thanks for the reply.
>
> I know that in this server has the monthly average is ready for use
>
> http://goldsmr2.sci.gsfc.nasa.gov/dods/MATMNXSLV.info
>
> I'm doing a monthly average of March, from 1979 to 2012 and then compare
> that to the monthly average of March 2013.
>
> I have another question about MERRA.
>
> Why in this server:
>
> http://goldsmr2.sci.gsfc.nasa.gov/dods/MAT1NXSLV.info
>
> And also on this server:
>
> http://goldsmr2.sci.gsfc.nasa.gov/dods/MATMNXSLV.info
>
> there is missing data on the level of 700 MB ?.
>
> avi.
>
>
>
>
> 2013/4/5 Mike Bosilovich <mike.bosilovich at gmail.com>
>
>> Hi Avi,
>>
>> The procedure we use to release data is discussed here:
>> http://gmao.gsfc.nasa.gov/research/merra/faq.php
>>
>> question 1, on the FAQ list  :-)   However, in reviewing that, I think
>> it's become dated. The near real time data are intended to be
>> processed within two weeks of the end of a month. After that, data and
>> automated quality checks are reviewed for problems. In January, we did
>> have to hold data for apparent problems during the processing.
>>
>> In going back through emails, February data was released by the GMAO
>> on Mar 19. After which, the GES DISC registers the data on their
>> servers.  While it all takes some time, and the people who are doing
>> it have other tasks as well. This is a stable way to routinely update
>> the data, and ensure we are not posting data with problems. While
>> problems are rare, its best to look at the data before releasing to
>> the community.
>>
>> Thanks for your interest in MERRA. Oh, and I notice that you are
>> computing monthly means, and wanted to be sure you know that we have
>> precomputed monthly averages on hat server. While there are many
>> reasons to do this for yourself, if you just need monthlies, then
>> using the precomputed data would be more efficient.
>>
>> mike
>>
>> On Fri, Apr 5, 2013 at 6:38 AM, avi kojokro <kojokroavi at gmail.com> wrote:
>> > Hello, Does anyone know the products of MERRA at this link?.
>> >
>> > http://goldsmr2.sci.gsfc.nasa.gov/dods/
>> >
>> >
>> > I use the number 10 and number 16 to make monthly average calculation.
>> > The question is, does anyone know when these servers are updated?, We
>> are
>> > now in early April, but these servers is updated by the end of February.
>> >
>> > Regards
>> >
>> > avi.
>> >
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