[Met_help] [rt.rap.ucar.edu #78739] History for General questions on MET

Fri Dec 2 09:17:58 MST 2016

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  Initial Request
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Hello MET help,

being PHD student at the Research Centre in Juelich, Germany, I have the following questions (before I install and run everything...):

1. I want to evaluate the WRF model with observations, so MET seems to fit :-) So MET is the first choice for this?

2. Is there a good observations coverage over Europe? In the dsxxx files, there are e.g. common synop stations included?

3. Is it possible to solely evaluate against ground station 2m temperature (I mean just extract one observation type)?

4. Is it possible to use solely observation from a single country (as I have seen a plot with synop stations just within the US in one of your tutorial slides).

5. Lets say I want to run or develop model output statistics (bias correction etc.). For this I need observations. Is it possible to use the MET scripts to extract observations from the dsxxx suitable for my domain? So giving me the observstions in some text file or so as a by-product.

Thank you very much for any kind of help on this, I highly appreciate this.

Cheers,
Jonas Berndt

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Forschungszentrum Juelich GmbH
52425 Juelich
Sitz der Gesellschaft: Juelich
Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498
Vorsitzender des Aufsichtsrats: MinDir Dr. Karl Eugen Huthmacher
Geschaeftsfuehrung: Prof. Dr.-Ing. Wolfgang Marquardt (Vorsitzender),
Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt,
Prof. Dr. Sebastian M. Schmidt
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  Complete Ticket History
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Subject: General questions on MET
From: John Halley Gotway
Time: Wed Nov 23 09:58:35 2016

Hello Jonas,

I see you have some questions about MET.  I'll answer them below.

Let me start by pointing you to the MET User's Guide:
   http://www.dtcenter.org/met/users/docs/overview.php
And the MET online tutorial:

http://www.dtcenter.org/met/users/support/online_tutorial/METv5.2/index.php

1. Yes, MET was written initially written to facilitate the
verification of
WRF model output.  Hopefully you'll find that MET meets your needs.
I'm
not aware of any alternative community-supported verification
packages.

2. The NCEP Global Data Assimilation system (GDAS) PREPBUFR point
observations include Europe.  Here's are some links:
   http://www.dtcenter.org/met/users/downloads/observation_data.php
Pay close attention to the note at the bottom of that page about the
quality control value for GDAS surface observations.

If you have an alternative point observation data source, let me know
and
we can talk about how to ingest them into MET.

3. The MET tools are controlled by ascii configuration files.  In them
you
set the variables/levels/message types you'd like to process.  So yes,
you
can easily process only surface temperature.

4. In the MET tools, you define spatial areas of interest which we
call
masking regions.  One way of defining those masking regions is by
specifying a list of lat/lon points, called polyline masking.  You can
verify over a single country by specifying the lat/lon points of its
boundary.  MET doesn't include a predefined mask for each of the
countries
in Europe.  But it does include map data for them... and it should be
pretty easy to adapt that map data into a polyline.

5. Yes.  First, you'd use the Point-Stat tool to compare gridded WRF
output
to point observations.  One of the output line types from Point-Stat
is
called MPR, for matched pair.  That contains one output line for each
forecast/observation pair.  While that's a very inefficient way of
storing
data, it's fine for a relatively small number of points.  Hopefully
that'll
give you what you need.

Hope that helps clarify.

Thanks,
John Halley Gotway

On Tue, Nov 22, 2016 at 8:59 AM, Jonas Berndt via RT
<met_help at ucar.edu>
wrote:

>
> Tue Nov 22 08:59:45 2016: Request 78739 was acted upon.
> Transaction: Ticket created by j.berndt at fz-juelich.de
>        Queue: met_help
>      Subject: General questions on MET
>        Owner: Nobody
>   Requestors: j.berndt at fz-juelich.de
>       Status: new
>  Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=78739 >
>
>
> Hello MET help,
>
> being PHD student at the Research Centre in Juelich, Germany, I have
the
> following questions (before I install and run everything...):
>
> 1. I want to evaluate the WRF model with observations, so MET seems
to fit
> :-) So MET is the first choice for this?
>
> 2. Is there a good observations coverage over Europe? In the dsxxx
files,
> there are e.g. common synop stations included?
>
> 3. Is it possible to solely evaluate against ground station 2m
temperature
> (I mean just extract one observation type)?
>
> 4. Is it possible to use solely observation from a single country
(as I
> have seen a plot with synop stations just within the US in one of
your
> tutorial slides).
>
> 5. Lets say I want to run or develop model output statistics (bias
> correction etc.). For this I need observations. Is it possible to
use the
> MET scripts to extract observations from the dsxxx suitable for my
domain?
> So giving me the observstions in some text file or so as a by-
product.
>
> Thank you very much for any kind of help on this, I highly
appreciate this.
>
> Cheers,
> Jonas Berndt
>
>
>
>
> ------------------------------------------------------------
> ------------------------------------
> ------------------------------------------------------------
> ------------------------------------
> Forschungszentrum Juelich GmbH
> 52425 Juelich
> Sitz der Gesellschaft: Juelich
> Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498
> Vorsitzender des Aufsichtsrats: MinDir Dr. Karl Eugen Huthmacher
> Geschaeftsfuehrung: Prof. Dr.-Ing. Wolfgang Marquardt
(Vorsitzender),
> Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt,
> Prof. Dr. Sebastian M. Schmidt
> ------------------------------------------------------------
> ------------------------------------
> ------------------------------------------------------------
> ------------------------------------
>
>
>

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