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UP: Fachverband Umweltphysik
UP 14: Atmosphäre - Spurengase, Aerosole und Labormessungen
UP 14.7: Vortrag
Donnerstag, 28. Februar 2013, 12:15–12:30, HS 5
Horizontal and vertical distribution of bromine monoxide in northern Alaska during BROMEX (spring 2012) derived from airborne imaging-DOAS measurements — •Denis Pöhler1, Stephan General1, Johannes Zielcke1, Paul B. Shepson2, Holger Sihler1, Udo Frieß1, Kerri A. Pratt2, Steve Walsh3, William R. Simpson3, and Ulrich Platt1 — 1Institut für Umweltphysik, Uni Heidelberg, Germany — 2Purdue University, West Lafayette, USA — 3Department of Chemistry and Biochemistry, University of Alaska Fairbanks, Fairbanks, AK
Bromine monoxide (BrO) is a reactive halogen species (RHS) and has been known for quite a while to have a profound impact on the chemistry of the polar tropospheric boundary layer. Details of the bromine release and reaction processes are still unclear, especially the role of different ice, atmospheric stability and aerosols. To investigate important details of the bromine release, a novel imaging DOAS instrument was deployed aboard a light twin-engine aircraft (ALAR, Purdue Univ.) as part of the BRomine, Ozone, and Mercury EXperiment (BROMEX) in Barrow, Alaska, in spring 2012. This instrument utilizes 1) a scanner system in nadir direction to map trace gas distributions of the overflown area at high spatial resolution and 2) a forward-looking system, to observe the vertical trace gas distribution of BrO and e.g. NO2. This was investigated over a wide variety of sea, ice and land surface conditions and observed a strong horizontal gradients of BrO within few km and a fast movement of BrO plumes. These and other results from 11 flights will be presented.