Trends in the Chemical Composition of the Troposphere using Satellite Data

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

Claire Granier

Service d'Aèrologie/IPSL, University of Paris 6; Boite 102
75005 Paris, France
Tel: +33 (0) 1 44 27 84 21 
Fax:  +33 (0) 1 44 27 37 76
 

The goal of this project is to analyse satellite observations of chemical compounds and identify year-to-year variability and trends in their distributions. Observations of the tropospheric columns of nitrogen dioxide are available from the GOME instrument from 1996 to the end of 2002, followed by the SCIAMACHY instrument on board ENVISAT since August 2002. MOPITT observations of the CO vertical profile have been made available since the beginning of 2000.

We will first analyze the observations of both NO2 and CO. Seasonal cycles will be quantified and compared for these two species. The seasonal cycles will be removed from the time series, in order to identify specific events as well as trends. Data for the largest world megacities will also be analysed and possible trends in these cities will be quantified. Finally, simulations using the MOZART-4 chemistry-transport global model will be performed over the full 1996-2004 period. The simulations results will be compared with the observations for both NO2 and CO, with a focus on seasonal variations and long-term trends. The consistencies between observed changes in the distributions of CO and NOx and changes in emissions distributions during the observation period will be studied. This work will also use results obtained from inverse modeling studies performed at the National Center for Atmospheric Research (Boulder, USA). High-resolution simulations will also be performed for the analysis of the observations corresponding to megacities.

Time schedule

 

2005

2006

2007

2008

Analysis of GOME/SCIAMACHY and MOPITT observations

*

 

 

 

Identification of interannual variability patterns and trends in large continental areas

*

*

 

 

Identification of trends in megacities

 

*

*

*

Modeling using a chemistry-transport model

*

*

*

*

Approximate person power and cost

 

2005

2006

2007

2008

Personnel / person-years

1

1

1

1

Yearly cost (kECU)

30

30

30

30

Likely funding agencies

CNRS, EU, CNES, NCAR, NOAA

Co-workers

Louisa Emmons, National Center for Atmospheric Research, Boulder, USA

Gabrielle Petron, National Center for Atmospheric Research, Boulder, USA

Andreas Richter, University of Bremen, Bremen, Germany

 

 


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