ROM SAF - NRT Notification Detail

NRT Notification Detail

Changes to the Metop NRT products (13 October 2016 and 20 October 2016)

DATE: 2016-10-07 19:17
TYPE: NRT-GTS

Description

Dear ROM SAF GTS User

Issued : 2016-10-07 19:13 UTC

On October 20, 2016, EUMETSAT will change the GRAS Radio Occultation
Level 1b processing from Geometrical Optics to Wave Optics (see: http://www.eumetsat.int/website/home/News/DAT_3212696.html).
In relation to this change, the ROM SAF will introduce additional QC checks
of the level 2a (refractivity) and 2b (1D-Var) products.
The ROM SAF operational system will be upgraded with these additional
QC checks already on October 13, 2016.

Thus, users of the refractivity products (GRM numbers 01 and 40) and the
1D-Var products (GRM numbers 02-05 and 41-44) can expect changes twice
within the next two weeks:

1) October 13, 2016:
Change of the ROM SAF QC. More profiles will be marked non-nominal.

2) October 20, 2016:
Change to Wave Optics processing at EUMETSAT. This will also
affect the refractivity and 1D-Var products.
Specifically the change allows to exploit refractivity data below 8 km which were previously declared non-nominal. In the 1D-Var products this will result in increased deviations from the ECMWF model in the troposphere.

The main impact of the new ROM SAF QC checks on the Wave Optics
data is twofold:

a) It will reduce the number of cases with erroneous oscillations
above 30 km, and generally reduce standard deviation in the stratosphere.

b) It will reduce the increased number of cases with large deviations from the
ECMWF model below 10 km, and generally reduce standard deviation in
the troposphere.

Details of the new QC will be given in validation reports currently
being prepared (and to be made available on the website:
http://www.romsaf.org/product_archive.php).

For more information on EUMETSAT Headquarters change see:
http://www.eumetsat.int/website/home/News/DAT_3212696.html

Please do not hesitate to contact us if you have any questions related
to the data, or if you would be interested in level 2a or 2b test data.

Kind regards
The ROM SAF Team

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