Heidelberg 2015 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 4: Postersession Atmosphäre

UP 4.5: Poster

Mittwoch, 25. März 2015, 10:45–19:45, G/Foyer

Spectroscopic measurements in the tropical tropopause layer from aboard the NASA Global HawkJ. Stutz1, M. Spolaor1, J. Festa1, F. Colosimo1, B. Werner2, R. Raecke1,2, •L. Scalone2, K. Pfeilsticker2, M. Chipperfield3, and R. Hossaini31Department of Atmospheric and Oceanic Science, UCLA, Los Angeles, USA — 2IUP, University of Heidelberg, Heidelberg, Germany — 3Institute for Climate and Atmospheric Science, SEE, University of Leeds, Leeds, UK

The Nasa initiated ATTREX (Airborne Tropical TRopopause EXperiment) project aims to answer relevant scientific questions such as the photochemistry, the micro-physics of aerosols and cloud particles, and air mass transport into and within the tropical tropopause layer (TTL). Within the ATTREX project, DOAS measurements were performed, using a 3 channel (UV/vis/near-IR) optical spectrometer. The DOAS measurements aim to measure the vertical profiles of Ozone relevant species in the TTL, such as O3, NO2, O4, BrO, IO and H2O, the liquid and ice water paths as well as some micro-physical properties of aerosols and clouds. Here an overview of the data is presented which were collected during the two field campaigns led from Edwards Air Force Base (EAFB) and Guam into the Eastern and Western Pacific. In particular we focus on the BrO and IO spectral retrieval which are interpreted using the radiative transfer model McArtim and predictions based on the photochemical fields simulated by SLIMCAT model. From the data new insights will be obtained into the photochemistry of halogen oxides in the TTL.

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