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Updating the ATOVS and AVHRR Pre-processing Package (AAPP) for future Polar-orbiting Satellites

Nigel Atkinson

8th December 2004

Acknowledgements: Steve English, Amy Doherty, Brett Candy (Met Office)Pascal Brunel, Tiphaine Labrot, Philippe Marguinaud (Météo-France)

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Contents

Description of AAPP

Applications of AAPP

Updating AAPP for future satellites

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What is AAPP?

Pre-processing package for polar orbiter dataMaintained by EUMETSAT Satellite Applications Facility for Numerical Weather Prediction (NWP-SAF)Lead institute - Met Office~200 licensed users worldwideRuns on a range of Unix and Linux computer platforms

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AAPP capabilities

SatellitesNOAA-15, 16, 17 (current AAPP version 4.4)NOAA-N, N’ (AAPP v5 in preparation)METOP (launch April 2006 – AAPP v6)Pre-NOAA15 HRPT

InstrumentsAMSU-A, AMSU-B, HIRS, AVHRR, (MSU)MHS (AAPP v5)IASI (AAPP v6)

Data inputsHRPTNESDIS 1b archives (NOAA-15 and later)EARS (EUMETSAT ATOVS Retransmission Service) 1a or 1c

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AAPP structure

HRPT

Decommutation

HIRS 1a/b

AMSUA 1a/b

AMSUB 1a/b

AVHRR 1a/b

atovin

hirscl

amsuacl

amsubcl

avhrcl

TBUS orTLE

AMSUA 1c AMSUB 1cHIRS 1c

atovpp

(HIRS) 1d avh2hirs

Antenna corrections

Atlas (land/sea, height)

Thresholds

Satellite position file

Compatible withNOAA 1b formats

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Applications of AAPP

Use within EARS systemPre-processor for Numerical Weather PredictionImagery for forecasters

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EARS system

EUMETSAT

Direct broadcast

HRPT

AAPP

1a data

HRPT

AAPP

1a data

HRPT

AAPP

1a data

Network of ground stations

Commercial Comms Satellite

AAPP

ATOVSL1d HIRS grid

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EARS coverage

Black: current ground stations

24 hours ofdata

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EARS coverage

Black: current ground stations Red: proposed extension

24 hours ofdata

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ATOVS in NWP at the Met Office

For global model, forecast run starts 1hr 45 min after center of 6 hour assimilation windowTypically

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Example of extra data

Global data assimilatedIn main run

EARS and Global dataassimilated in main run

Blue = NOAA-16Red = NOAA-15

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Imagery from ATOVS level 1d

AMSU-ALiquid cloud

AMSU-BScattering1 Oct 2004, 1500 AMSU-A grid

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AMSU-B scattering index

12 Aug 2004, 0600-1100 AMSU-B grid

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HRPT station at Exeter

Installed Nov 2004Supplied by Kongsberg Spacetec (Norway)Receives

5 NOAA (12,14,15,16,17)MODIS on Terra + AquaFY-1D

METOP compatible

Possibly Windsat??

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AAPP Developments - METOP

METOP AHRPT(CCSDS packets)

ATOVS IASI ‘level 0’

ATOVS 1a/b

ATOVS 1c IASI 1c

BUFR decode

EUMETCASTGlobal IASI

EUMETCASTGlobal ATOVS+ EARS

ATOVS/IASI 1d

ATOVS 1d

BUFR decode

AAPP

OPS(CNES)

NB: IASI 1c = calibrated, corrected & Gaussianapodised

Reduced channel set and/orEigenvector scores

or GTNor GTN

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AAPP – future developments

NPP and NPOESSAAPP development effort will concentrate on METOP, but would like to process NPPNew instruments – CrIS, ATMS, VIIRSWill there be direct broadcast for NPP? If so, can we receive it?Need to define formats ASAP – e.g. level 1b. NB: Launch (“early 2006”) may be close to that of METOPNPP orbit is 1030 (c.f. METOP 0930)

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Conclusions

AAPP is used worldwide to pre-process direct-readout polar orbiter dataFreely available – seehttp://www.metoffice.com/research/interproj/nwpsaf/deliverables.html

Version 5 will be released soon after launch of NOAA-NPreparations well underway for METOP-compatible version, including IASIPlan to extend for NPP and NPOESS – but need detailed information on instruments and formats as soon as possible