Precipitation ClusterProcessing chain

H-SAF Training and Users Service, Rome, 14-15 December 2009

Cap. Davide MELFICap. Davide MELFI

ITALIAN AIR FORCE MET SERVICEC.N.M.C.A. - Satellite Branch

TOPICS

• HW architecture

• Overview on processing chains

• Changing in PR-OBS03 processing chain

Previous HW architecture for HSAF’s products

New HW architecture for HSAF’s products

BUFR output:Encoded by ECMWF libemoswith B0000801102

ASCII output:sea/land/coast indicationPNG output: Made with GMT freeware SW

PNG output: Made with GMT freeware SW

PNG output: Made with GMT freeware SWPNG output: Made with GMT freeware SW

BUFR output:Encoded by ECMWF libemoswith B0000801102

ASCII output:sea/land/coast indicationGRIB2 output: Encoded by ECMWF grib_api

GRIB2 output: Encoded by ECMWF grib_api

ftp://ftp.meteoam.it/utilities/Bufr_decode/

Header

Products ONLINE OFFLINE OUTPUT formatftp://ftp.meteoam.it/utilities/

PR-OBS01 3 min (input – 2,5 h delay)

BUFRPR-OBS02 30 sec (input – 5 min

delay)1 month /1 week +

Recovery from archive

PR-OBS03 1 min

1 month /1 week + Recovery from archive GRIB2

PR-OBS05 3 min

Processing Time

Changing in PR-OBS03 processing chain

• H03: version 1.0 First release

• H03: version 1.1

• H03: version 1.2 Exclusion of Semi-transparent cloud

• H03: version 1.3 Parallax error correction

Input in BUFR format

Decreasing of computational time:- Optimization of the SW- Masking of IR data (cloudy pixels)

MaskingNWCSAF - Cloud type

EFFECT OF OBSERVATION ZENITH ANGLE AND CLOUD TOP HEIGHT ON PARALLAX DISPLACEMENT

SUB SATELLITE POINT SSP PARALLEX

DISPLACEMENT

Parallax error

NWCSAF - CTH

Parallax error correction

EUMETSAT subroutine(Marianne König )

Case study 4-10-2008 16:42

2 pixels in the same new one The colder one remains

Parallax error correction

03:00 03:15 03:30 03:45 04:00 04:15 04:30 04:45 05:00 05:15 05:30 05:45

TimelineHSAF 03:15 RUNNING

03:30 05:45

SEVIRIMSU

SEVIRIMSUSSMI

Receiving time

Acquisition time

Delayed running

Last 3 H. 3 H before

Last 3 H.

12-9 before

9-6 before

6-3 before

Last 3 H.

Last 3 H.

6-3 before

9-6 before

12-9 before

24-12 before

Contribute of SSMI/S data to OBS5Cum. Prec

3.00 6.00 12.00 24.00

Thanks for attention!