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Coarse data

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The coarse data of model outputs, which are active data, and external data.

Table of contents

  • Active data
  • Retrieved variables
  • Cumulated variables
  • T
  • PS
  • Active test data
  • Notes
  • See also

Active data

Numerical models of a dynamical process produce active data. They are given at time steps, and usually make up the lion’s share of the required data. In the benchmark demo test case, there is only one time step available. In lies in the nature of a demo to pre-select the area. The introduction of new data is of course not as restricted. As of June 2018, the only tests with a more complete data set have maintained their shared area.

Multiple year COSMO-DE surface analysis data are available on the local machine:

/automount/ags/tr32/COSMO_DE_ANA

Their format is Grib.

The domain of COSMO-DE encompasses the part of Central Europe between the the Alps and the North and Baltic Sea. Read_grib1 crops from this a rectangle around the lower Rhine with an area of 2*10^11 m². As read_grib1 is a Fortran subroutine employing ecCodes, the 1st index is 1, not 0 like in NCL. The crop vertices are roughly Frankfurt/Main, Hannover, Amsterdam and Reims, its coordinates in terms of NCL indices are:

1st direction (longitude):  40... 40+160-1 =  40...199
2nd direction  (latitude): 151...151+160-1 = 151...310

This is a larger domain than the test data.

Example of coarse active data from grib files Example of coarse active data from grib files, with passe-partout
Fig. 1: A spatially complete field of an example variable at an example time step from COSMO-DE data.
Fig. 2: The area around the lower Rhine from from the data on the left. The plotted area is the same as there for scale.

Retrieved variables

Table: The variables this project plans to retrieve from COSMO-DE output (in Unicode order) along with their Grib keys

|^.
|. name |. German name |. ee |. lvtyp |_. tab |
|-.

ALB_RAD Albedo des Bodens im Kurzwelligen 84 1 2
ASOB_S Kurzw. Strahlungsbilanz an der Oberflaeche 111 1 2
ATHB_S Langw. Strahlungsbilanz an der Oberflaeche 112 1 2
PS Unreduzierter Bodendruck 1 1 2
T Temperatur 11 110 2
TD_2M 2m-Taupunkt 17 105 2
TOT_PREC Gesamtniederschlag 61 1 2
T_G Temperatur der Unterlage 11 1 2
U_10M Zonaler Wind 33 105 2
V_10M Meridionaler Wind 34 105 2

The table provides an overview of what variables this project chooses from COSMO-DE. A few of them deserve special attention.

Cumulated variables

ATHB_S, ASOB_S and TOT_PREC are not instantaneous variables like the others. Instead the former 2 are averaged over a few preceeding hours and the latter just adds some up.

T

‘T’ is the name for temperature on layers throughout the atmosphere and showcases multiple layers in its entry.

PS

A property of COSMO-DE is that the surface pressure PS is a diagnostic variable. Pressure prognosis is prepared on the pressure of the lowest model layer, as well as further layers.

Active test data

Test data for the downscaling code are available within the downscale source code. Their format is NetCDF:
source:data_oasis3/ann/benchmark/*.nc

Example of coarse active data from netCDF files, in context of COSMO-DE
Fig. 3: A spatiotemporally complete field of an example variable from the test data. The plotted area could just house the COSMO-DE domain.

Notes

  • lvtyp=100 and lvtyp=103 are reserved for alternative layers, results from interpolations, which COSMO does not (actively) use.

See also

  • source:oasis3/lib/downscal/src/src_downscal2.F90
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