Heidelberg 2015 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 4: Postersession Atmosphäre

UP 4.4: Poster

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

Aircraft-borne DOAS limb observations of UV/visible absorbing trace gas species over Borneo — •Katja Großmann1, Marcel Dorf2, Bodo Werner1, and Klaus Pfeilsticker11Institute of Environmental Physics, Heidelberg, Germany — 2Max Planck Institute for Chemistry, Mainz, Germany

Airborne spectroscopic measurements were carried out aboard the research aircraft DLR-Falcon during the SHIVA campaign at Malaysian Borneo in November and December 2011 to study the abundance and transport of trace gases in the lower atmosphere. The measurements were evaluated using the DOAS technique in limb geometry, which supports observations of UV/visible absorbing trace gases. Vertical profiles of IO were inferred with maximum mixing ratios of 0.5-1.5 ppt close to its source region in the marine boundary layer. Enhanced IO concentrations occasionally occurred in the mid-troposphere, suggesting rapid vertical transport by shallow to medium strong convection. BrO did not exceed the detection limit since in the terrestrial tropical atmosphere around Borneo the chemistry of volatile organic compounds (VOCs) acts as a large sink for reactive bromine species. Frequently enhanced concentrations of HCHO and CHOCHO indicate efficient VOC photochemistry around Borneo since they are mainly produced through the oxidation of VOCs emitted from the tropical rain forest and from distinct anthropogenic sources. Signatures of HONO, HCHO, and NO2 in the outflow of convective clouds suggest a rapid transport of HCHO and NO2 from polluted near surface air into the upper troposphere as well as lightning-induced production of HONO and NOx.

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