Monitoring Nitrogen Oxides in the Troposphere
with GOME and SCIAMACHY

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

Steffen Beirle

Institut für Umweltphysik, University of Heidelberg INF 229
D-69120 Heidelberg, Germany
Tel.:  +49-(0)6221 546314
Fax:  +49-(0)6221 546405

Nitrogen oxides (NO+NO2=NOx) are important ozone precursors in the troposphere. Column densities of NO2 are detectable from satellite platforms using differential optical absorption spectroscopy (DOAS). Tropospheric column densities can be retrieved by estimating and subtracting the stratospheric fraction. From GOME observations, a time series of 8 years (1996-2003) of NO2 column densities is available on a global scale with a spatial resolution of
320 ´ 40km2. Since March 2002, SCIAMACHY provides the continuation of the GOME time series with an improved spatial resolution (60 ´ 30km2) and new viewing geometries, allowing also direct stratospheric measurements.

We performed a number of studies to identify and quantify the different sources of nitrogen oxides (traffic, industry, ship emissions, biomass burning and lightning) from the GOME data. In several cases we could also use the GOME results to estimate the lifetime of tropospheric NOx. We want to use the specific advantages of SCIAMACHY, i.e. the higher spatial resolution, to continue and refine these studies to provide additional and independent estimates of source strengths of nitrogen oxides on regional and global scales. This may help to improve the absolute numbers as well as the distribution patterns of source inventories.

Time schedule

 

2004

2005

2006

2007

2008

2009

NO2 analysis from GOME and SCIAMACHY

*

*

*

 

 

 

Dependence on clouds and aerosols

*

*

*

*

 

 

Systematic studies on the source strengths of NOx

*

*

*

*

*

*

Estimation of the lifetime of NOx

*

*

*

*

*

*

Trends of NO2

 

 

*

*

*

*

Approximate manpower and cost

 

2004

2005

2006

2007

2008

2009

Personnel / person-years

0.4

0.4

0.4

0.4

0.4

0.4

Yearly cost (kECU)

5

5

5

5

5

5

Likely funding agencies

BMBF, EU, DFG

Co-workers

Dr. Thomas Wagner

Prof. Ulrich Platt

Institut für Umweltphysik, University of Heidelberg,
INF 229, D-69120 Heidelberg, Germany

 

 


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