Hannover 2003 – wissenschaftliches Programm

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UP: Umweltphysik

UP 1: Atmosphäre und Klima – Poster

UP 1.9: Poster

Donnerstag, 27. März 2003, 16:00–18:00, Lichthof

Highly Resolved Global Distribution of Tropospheric NO₂ using Satellite Data — •Steffen Beirle¹, Ulrich Platt¹, Mark Wenig², and Thomas Wagner¹ — ¹Institut für Umweltphysik, INF 229, 69120 Heidelberg, Germany — ²NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA

Modern satellite experiments (Global Ozone Monitoring Experiment (GOME), since 1995; SCIAMACHY (SCanning Imaging Absorption SpectroMeter for Atmospheric CHartographY), since 2002) enable the retrieval of global total column densities of atmospheric trace gases, inter alia NO₂. Tropospheric vertical column densities (VCDs) are derived by estimating the stratospheric fraction over the ocean. Since the lifetime of tropospheric NO₂ is in the order of one day, the measured VCD reflects the amount of emitted NO₂. The long year mean of GOME data clearly points up regions of enhanced industrial activity. Also the influence of biomass burning and large lightning activity can be seen. However, the emissions of punctiform sources like large cities are smeared out due to the resolution of 320*40 km² of the GOME viewing pixels.

In this study we achieve maps of tropospheric NO₂ VCD in a better resolution, using a) the meanwhile large amount of GOME measurements in the narrow swath mode (80*40 km²), executed every tenth day, and b) the highly resolved measurements of SCIAMACHY.(60*30 km²). This allows the seperation of sources located close together and will help to identify and quantify the different sources of NO₂.