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Bremen 2000 – wissenschaftliches Programm

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UP: Umweltphysik

UP 5: Datenauswertung (Atmosph
äre) I

UP 5.4: Vortrag

Mittwoch, 22. März 2000, 12:00–12:15, H2

SURFACE NO, NO2, AND NOy MIXING RATIOS AT NEUMAYER BASE, ANTARCTICA (70deg S, 8deg W) — •Rolf Weller1, Andrea Wille1, Katja Riedel1, Otto Schrems1, Anna Jones2, and Eric Wolff21Alfred Wegener Instutute for Polar and Marine Research — 2British Antartic Survey, NERC; High Cross, Madingley Road, Cambridge, CB3 0ET, UK

One major goal of the PEAN99 campaign (Photochemical Experiment at Neumayer, January/February 1999) was to assess the photochemistry of reactive nitrogen oxide compounds and their chemical and physical exchange processes with the firn layer. For this purpose we measured NO/NO2/NO y by two chemiluminescence detectors coupled with a photolytical NO 2 and a Au/CO catalysed NOy convertor, respectively. The focus of this contribution are gaseous NO/NO2 mixing ratios measured during the campaign and the first results of the continuous NOy record started in February 1999. Typically, background NO and NO 2 mixing ratios were below 10 pptv throughout the campaign and showed a distinct photochemically driven diurnal variation with maximum NO and NO 2 values around noon and midnight, respectively. Up to now (Nov. 99) the NO y mixing ratios were found to be in the range from 20 to 100 pptv. The diurnal and seasonal variability of the observed NO/NO 2 and NO y mixing ratios and the influence on local boundary layer photochemistry will be discussed.

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