Tracking Pollution from Space-borne Thermal IR Sounders

A contribution to ACCENT-TROPOSAT-2, Task Group 1

Philippe Ricaud

Laboratoire d'Aerologie UMR 5560 CNRS/Universite Paul Sabatier
Observatoire de Midi-Pyrenees 14, Avenue Edouard Belin
F-31400 Toulouse France
Tel: +33 5 61 33 27 23 or 05 61 33 27 23
Fax:   +33 5 61 33 27 90 or 05 61 33 27 90
 

The present proposal intends to investigate the potential offered by space borne thermal infrared nadir sounders to track and study pollution. Carbon monoxide (CO) will be used as a primary target as it is a good tracer of pollution and a strong thermal IR absorber. Data from past (IMG), present (MOPITT/AIRS/TES), and future (IASI) missions will be investigated. Prospective studies concerning forthcoming satellite missions and parallel assimilation of radiances will also be conducted.

The two first tasks of the proposed study will primarily rely on the radiative transfer forward and inverse model Atmosphit, developed at the Université Libre de Bruxelles (ULB). The third task will also require using the 3-D Chemistry Transport Model (CTM) MOCAGE of Meteo-France and the Projet d’Assimilation par Logiciel Multi-Methodes (PALM) developed at CERFACS.

Task 1: retrieval of CO vertical profiles from radiances measured by thermal IR nadir sounders (IMG, TES, IASI) using an Optimal Estimation Method. Characterization of the retrieved profiles in terms of precision and vertical information content.

Task 2: based on radiative transfer simulations and optimal estimation retrieval analysis, evaluation of the capabilities of a forthcoming “pollution sounder” to improve the determination of pollution parameters: primarily CO.

Task 3: direct assimilation of thermal IR radiances measured from space. The objective is to investigate the possibility to produce assimilated CO fields (level 3) from calibrated nadir radiances (level 1) through the parallel coupling of a radiative transfer model (Atmosphit) and a 3-D CTM (Mocage).

Time schedule

 

2005

2006

2007

2008

2009

Task 1

*

*

*

 

 

Task 2

*

*

*

*

 

Task 3

 

 

*

*

*

Approximate manpower and cost

 

2005

2006

2007

2008

2009

manpower

2

2

3

2

2

cost

15

15

20

15

15

Likely Funding Agency 

French Programmes: PNCA, CNES (TOSCA)

Co-workers involved

V.-H. Peuch, Météo-France, Toulouse, France.

D. Cariolle, CERFACS, Toulouse, France.

B. Barret, Université Libre de Bruxelles, Belgium.

 


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