Scientific Interpretation of SCIAMACHY CO, CO2 and CH4 Measurements

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

Sander Houweling

SRON – National Institute for Space Research, Sorbonnelaan 2, NL 3584 CA Utrecht
Tel.:  +31-(0)30-2532909
Fax:  +31-(0)30-2543163

The following contribution to the ACCENT TROPOSAT-2 programme is envisaged.

The interpretation of SCIAMACHY measurements of the medium to long-lived atmospheric trace gases CO, CH4, and CO2. The aim of this project is to explore the available calibrated and validated data and to investigate the extent to which these data corroborate the existing observational evidence, or point at possible gaps in our understanding. The focus will be on regions that are not well covered by conventional monitoring efforts, pertaining to most of the tropical continents, and remote temperate and boreal zones. The measurements will be used to narrow down the uncertainties in key processes that control long-term trends in mixing ratio, and variability on seasonal and inter-annual time scales. The main emphasis will be on the estimation of surface sources and sinks, quantifying budgets on scales ranging from global to regional. These estimates will be obtained by inverse modelling, which, in most of the current applications, makes use of atmospheric transport models only. As a next step we plan to investigate the use an atmospheric transport model (TM3/5), in combination with process-based models of the land surface, such as ecosystem models (for CO2) and wetland models (for CH4). This approach has the promising advantage that other satellite products can be taken into account as additional constraints to the optimization procedure. Promising candidates that will be explored within this project are NDVI/LAI (photosynthetic activity), ATSR fire counts/GLOBSCAR (biomass burning), and SAR (natural wetlands). At a later stage we will also investigate potential synergies of combining the measurement of different tracers with common sources, which is the case, for example, for CO and CO2.

This project will be in close collaboration with the proposed AT2 project ‘Retrieval and Validation of SCIAMACHY CO and CH4 Measurements’. In the first phase, before any validated SCIAMACHY measurements are available, preparatory work will be carried out including synthetic feasibility studies (activity 1). Once data are available mutual benefits are expected improving both the retrieval products and the source and sink estimates (activity 2). In a later stage the gained experience will be used to support promising new satellite missions (activity 3). 

Time schedule

 

2004

2005

2006

2007

2008

Activity 1

****

****

**

**

**

Activity 2

 

**

****

****

****

Activity 3

 

 

 

**

****

 Approximate manpower and cost

 

2004

2005

2006

2007

2008

Personnel / man-years

2

3

4

4

4

Yearly cost (kECU)

130

195

260

260

260

Likely funding agencies

BSIK, SRON-GO (National support programmes), and the  EU.

Co-workers

Drs. Joanne Skidmore and Prof. Dr. Ilse Aben 

          SRON

          Sorbonnelaan 2

          3584 CA Utrecht, The Netherlands

Dr. Maarten Krol

          Institute for Marine and Atmospheric research Utrecht (IMAU)

             PO box 80000,

             3508 TA Utrecht, The Netherlands

             email: M.Krol@phys.uu.nl

        

 

 


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