Establishment of an Integrated Ground Truthing Station
for Satellite Data Products

A contribution to ACCENT-TROPOSAT-2, Task Group 3

Ralf Sussmann

IMK-IFU, Forschungszentrum Karlsruhe, Kreuzeckbahnstrasse 19
82467 Garmisch-Partenkirchen, Germany
Tel.:  +49-(0)8821-183 159
Fax:  +49-(0)8821-183 73573

The aim of this PI contribution is to improve the capabilities for (i) validating satellite data products in the field of tropospheric atmospheric chemistry, aerosols and meteorology and for (ii) providing independent input-information for improving the trace-gas retrievals from satellite measurements by establishing and operating an “Integrated Ground Truthing Station - IGTS” at Zugspitze/Garmisch, Germany (47 °N, 11 °E) including in-situ, ground based remote and aircraft measurements in combination with transport modelling activities.

IGTS consists of two fully operational stations, at Zugspitze (2964 m) and Garmisch (734m) which are operated on a permanent basis, and are already equipped with a broad range of ground-based remote sounding instrumentation (e.g. lidar, FTIR, GPS, UV radiometry), and in-situ instrumentation. This equipment will be technically adapted and supplemented for the dedicated validation of tropospheric trace compounds (H2O, CO, CH4, N2O, O3, HCFC-22 (CHClF2), C2H6, Aerosols). This includes the development of new ground-based instrumentation, e.g. a differential absorption water vapour lidar at the Zugspitze, and the set up of a new FTIR system at Garmisch which will be used to characterize the boundary layer and complement the Zugspitze FTIR. In addition, a high-spectral-resolution lidar system will be set up at Garmisch for separating the retrieval of extinction and backscatter profiles which is a pre-requisite for validating the satellite-derived extinction profiles.

Improved ground-based retrieval methods will be developed and used for obtaining tropospheric trace-gas profiles from FTIR spectroscopic measurements. The advantages of coincident ground based remote measurements at the high-altitude site Zugspitze and the nearby low-altitude site Garmisch in combination with aircraft measurements will be exploited. This allows the retrieval of vertical trace gas profiles which are representative for a large horizontal area and, at the same time, characterize the boundary layer. The latter is important, e.g. for detecting pollution episodes (e.g. strongly impacting the NO2 columns). Furthermore, in the case of water vapour, a high-altitude site is the only means to reach by ground-based remote sensing the upper troposphere and lower stratosphere, which is a region otherwise nearly impossible to be validated.

Satellite retrievals of tropospheric trace compounds are impacted by the optical properties of aerosols, i.e. scattering and absorption of light on aerosols in the same altitude range. Therefore, one important topic in this PI contribution is to provide as an input to improved satellite retrievals the vertical profiles of aerosol size distributions and optical properties. This will be done under selected conditions with desert dust, biomass burning and industrial aerosols within the boundary layer using airborne measurements on small or ultra-light aircraft. The airborne investigations will be supported by continuous measurements with equivalent instrumentation at the Zugspitze and at the tropical GAW station at Mt. Kenya (3800 m).

Time schedule

 

2004

2005

2006

2007

2008

2008

Instrumentation

*

*

*

*

 

 

Retrievals

*

*

*

*

*

*

Comb. Instrum.

 

 

 

 

*

*

Airborne Aerosols

*

*

*

*

*

*

Approximate manpower and cost

 

2004

2005

2006

2007

2008

2008

Personnel / man-years

3

3

3

3

3

3

Yearly cost (kECU)

150

150

150

150

150

150

Likely funding agencies

EC; German BMBF/DLR, Helmholtz-Society, Deutsche Forschungsgemeinschaft (DFG)

Co-workers

Wolfgang Junkermann and Thomas Trickl
 

 


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