Heidelberg 2015 – scientific programme

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UP: Fachverband Umweltphysik

UP 4: Postersession Atmosphäre

UP 4.15: Poster

Wednesday, March 25, 2015, 10:45–19:45, G/Foyer

Detection of noctilucent clouds in SCIAMACHY/Envisat nadir UV-measurements — •Martin Langowski and Christian von Savigny — EMAU Greifswald

The polar summer mesopause is the coldest region in the Earth's atmosphere and yields favorable conditions for cloud formation during three summer months and >50 deg. latitude. These clouds are called noctilucent clouds NLC, as through their high altitude of 82-88 km they are still illuminated several hours after/before sunset/sunrise.

Long term studies from SBUV satellite nadir measurements, e.g. DeLand et. al. (2007) and Shettle et. al. (2009), show an 11 years cycle for the occurence frequency of NLC as well as an long-term increase. The long term increase is not seen in other studies of the same dataset (e.g. Stevens et. al. 2007), in which the data is filtered for only certain local times.

Currently a new algorithm for the GOME, SCIAMACHY and GOME-2 instruments is being developed to extend the NLC data from nadir measurements. We will present this algorithm and show first results.