Tropospheric Studies using Infrared Spectroscopic Measurements
from Space

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

Pierre-François Coheur

Spectroscopie de l'Atmosphère, Chimie Quantique et Photophysique, Université Libre de Bruxelles
CP160/09, 50 Av. F.D. Roosevelt, B-1050 Bruxelles
Tel.:  +32-(0)2 6502432
e-mail:  pfcoheur@ulb.ac.be
Fax:  +32-(0)2 6504232

The present research proposal is a contribution to the study of the Earth’s tropospheric composition, of its evolution in space and time, and of its impacts on air quality and on climate. It will rely mainly on the analysis of atmospheric spectra measured by a number of space-borne infrared sounders, which will follow specific orbits and will operate in different geometries, depending on the scientific objectives they aim to achieve, and on prospective studies for future space missions.

Figure 1: Ozone profile retrieval for selected IMG spectra, coincident with the Uccle (left panel) and the Ny-Alesund (right panel) observing sites. Globally, between 2 and 4 independent pieces of information can be retrieved independently from thermal IR nadir spectra, thereby providing an accurate representation of the ozone content in both the troposphere and the stratosphere. These results open promising perspectives to obtain a global view of the changing ozone vertical distributions from the operation of new generation tropospheric sounders (e.g. TES and IASI). Further improvements are expected from the synergetic use of IR and UV-visible instruments observing the same scene.

The foreseen tasks include:

- The retrieval of trace gas vertical profiles from nadir infrared radiance. This will include the improvement and testing of the ULB retrieval software and its application to the measurements of past (IMG), present (TES) or forthcoming (IASI) thermal infrared tropospheric sounders. The emphasis will be put on O3 (see Figure 1), CO, HNO3 and possibly volcanic SO2

- The coupling of the infrared and UV/visible measurements (IMG/GOME, TES/OMI, IASI/GOME-2) to improve the accuracy and the vertical sensitivity of the ozone tropospheric measurements from space.

- The analysis of solar occultation measurements provided by ACE, to probe the upper troposphere and the lower stratosphere (UTLS).

- Prospective studies to evaluate the possibility to detect and characterize from space (leo or geo satellites), local or regional pollution events involving fast reactive species.

Time schedule

 

2004

2005

2006

2007

2008

2009

Activity 1

***

***

***

***

**

**

Activity 2

**

**

**

*

*

*

Activity 3

*

*

*

 

 

 

Activity 4

***

**

*

*

 

 

Approximate manpower and cost

 

2004

2005

2006

2007

2008

2009

Personnel / man-years

3

3

3

2

2

2

Yearly cost (kEuro)

20

20

20

15

15

15

Likely funding agencies

ESA/Prodex fundings through the Belgian Science Policy

Co-workers

Daniel Hurtmans,  Chimie Quantique et Photophysique, ULB, Belgium

Cathy Clerbaux, Service d'Aeronomie / CNRS, Paris, France

Solene Turquety,  Service d'Aeronomie / CNRS, Paris, France


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