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UP: Fachverband Umweltphysik

UP 1: Poster Session

UP 1.25: Poster

Dienstag, 15. März 2011, 18:30–20:30, P2

MAX-DOAS Measurements aboard 'RV Polarstern' — •Johannes Lampel, Jens Tschritter, Udo Frieß, and Ulrich Platt — Institut für Umweltphysik, Heidelberg, Deutschland

Reactive bromine and iodine compounds emitted from the ocean in the atmosphere can be of great importance for the chemical balance of the marine boundary layer, even if they are present in very small amounts of only some parts per trillion. Their impact ranges from the destruction of ozone and the modification of the oxidative capacity to the formation of new ultrafine particles and possible influences on the global climate via modification of cloud optical properties. Here we present measurements from our long-term Multi-Axis DOAS instrument aboard the research vessel Polarstern. DOAS measurements, ranging from the Arctic over tropical regions to Antarctica, have been performed aboard Polarstern for almost ten years. In 2009, the spectrometer has been replaced to extend the spectral range and a new telescope unit has been installed which actively compensates for the roll movement of the ship. Focusing on the Atlantic transect ANT 26/1 from Bremerhaven/Germany to Punta Arenas/Chile in autumn 2009, its capabilities are discussed and iodine oxide column densities and aerosol profiles obtained during the cruise will be presented.