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UP: Fachverband Umweltphysik

UP 2: Atmosphäre

UP 2.6: Vortrag

Mittwoch, 25. März 2015, 11:00–11:15, G/gHS

Towards a better tropospheric ozone product from SCIAMACHY Limb-Nadir-Matching method — •Jia Jia, Alexei Rozanov, Annette Ladstätter-Weißenmayer, Felix Ebojie, Stefan Bötel, and John Burrows — Institute of Environmental Physics, Bremen, Germany

Tropospheric ozone is one of the most important green-house gases with an estimated RF of 0.40 +- 0.20 W/m2 (IPCC, 2013). It is the main component of photochemical smog. As a strongly oxidizer, it influences human health as well as vegetation. Tropospheric ozone is either transported from the stratosphere or photochemically produced during the pollution events in the troposphere. Satellite measurements are well suitable to investigate sources, transport mechanisms of tropospheric ozone in a global view and to studyb characteristics in regional scale. However, the usage of satellite data is associated with challenges as 90% ozone is located in the stratosphere and only about 10% can be observed in the troposphere.

The limb-nadir matching (LNM) technique is one of the methods used to retrieve tropospheric ozone distributions from space borne observations. It is an approach that involves the subtraction of the stratospheric ozone column from the total ozone column by using tropopause height information. In our study this approach is applied with SCIAMACHY instrument which alternates between limb and nadir geometry. Here we focus on reducing the uncertainty of the tropospheric ozone by refining both limb retrievals and the matching technique. The results are validated with ozone sonde measurements.