HR: 0800h
AN: A51C-0581    [Abstracts]
TI: DOAS Measurements of Reactive Halogens at Greenland Summit in May and June, 2007
AU: * Hurlock, S C
EM: steveh@atmos.ucla.edu
AF: Department of Atmospheric and Oceanic Sciences University of California Los Angeles, Room 7127 Math-Sciences Building, Los Angeles, CA 90095, United States
AU: Stutz, J
EM: jochen@atmos.ucla.edu
AF: Department of Atmospheric and Oceanic Sciences University of California Los Angeles, Room 7127 Math-Sciences Building, Los Angeles, CA 90095, United States
AU: von Glasow, R
EM: R.Von-Glasow@uea.ac.uk
AF: University of East Anglia School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, United Kingdom
AU: Piot, M
EM: matthias.piot@iup.uni-heidelberg.de
AF: Institute of Environmental Physics University of Heidelberg, Im Neuenheimer Feld 229, Heidelberg, D-69120, Germany
AB: Reactive halogens in the arctic atmosphere have been a subject of measurement and analysis since the mid- 1980s, when sudden arctic springtime ozone depletion events at arctic coastal stations were correlated with increases in reactive bromine compounds. Previous evidence of reactive halogens at Greenland Summit, where the coast is over 400 km away and the elevation is 3200 m, provided some of the motivation for a large field campaign at Greenland Summit during the late spring of 2007. This campaign was designed to quantify reactive halogens and other species and factors influencing the arctic atmosphere at higher elevations and far away from the coast. UCLA participated in this campaign with two DOAS instruments. The UCLA long path instrument, LP- DOAS, was operated on light paths of 2 or 5 km (one way) 2-3 m above the snow. A dedicated multi-axis (MAX)- DOAS, designed for the Summit environment and installed in 2006, was also used and collected scattered sunlight at elevation angles of 1, 3 and 10 degrees, as well as from the zenith. LP-DOAS measurements were made in 4 regions from 290 to 580 nm and the MAX-DOAS was set to record spectra from 318 to 385 nm, so that the BrO absorption in the 300 – 350 nm region was accessible to both. This poster presents results from the DOAS instruments at Summit, including observation of BrO in the lower boundary layer during the 2007 campaign. A number of periods of elevated BrO were observed during the month-long observation period of May 15 – June 15, with mixing ratios as high as 3 ppt.
DE: 0365 Troposphere: composition and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting