[gradsusr] Reanalysis Question

[Mike Bosilovich]

I see.  All variables that are provided are listed in the MERRA File
Specification Document:
http://gmao.gsfc.nasa.gov/research/merra/file_specifications.php

The simgle level  fields at certain pressure levels were added for higher
temporal frequency analysis, but not all pressure levels are included
there. 700 mb data are in the 3 dimensional data files.

Mike


On Sat, Apr 6, 2013 at 2:13 AM, avi kojokro <kojokroavi at gmail.com> wrote:

> Hello mike.
>
> I think I did not frame my question properly, or did not understand you.
> I asked why there is no temperature data or height of  level 700 hpa?. I
> am attaching a screenshot:
> I circled in red marks what  missing t700 and h700?.
>
>
> 2013/4/5 Mike Bosilovich <mike.bosilovich at gmail.com>
>
>> 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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>>>> >
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>>>
>>>
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>>
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