Regensburg 2007 – scientific programme
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UP: Fachverband Umweltphysik
UP 5: Atmosphäre und Klima II
UP 5.1: Talk
Monday, March 26, 2007, 12:00–12:15, Phy 5.0.20
Ground-based solar absorption measurements of CH4, CO, C2H6, C2H2 and HCN in the tropics — •Anna Katinka Petersen1, Thorsten Warneke1, Voltaire Velasco1, Justus Notholt1, and Otto Schrems2 — 1Institute of Environmental Physics (IUP), University of Bremen, Bremen, Germany — 2Alfred Wegener Institute for Polar and Marine Research (AWI), Bremerhaven, Germany
The composition of the tropical atmosphere and its change is of significant importance for global climate. Currently large uncertainties in the budgets of many trace gases in the tropics exist, mainly due to a lack of measurements in the tropics. We have performed solar absorption Fourier Transform InfraRed measurements at Paramaribo, Suriname (5.83°N, 55.17°W) during four consecutive dry seasons, starting in autumn 2004. Currently these are the only remote sensing measurements performed in the inner-tropics over a longer time period. In the case of methane these measurements represent the only tropical ground-based remote sensing data of sufficient precision to validate satellite retrievals of CH4. Here we present first results on methane (CH4) and trace gases related to biomass burning. Methane retrievals are compared with model simulations, satellite retrievals from SCIAMACHY and in situ data. In addition we investigate the pollution from biomass burning using CO, C2H6, C2H2 and HCN. Backward-trajectories and global fire maps were used to identify the origin of the polluted air masses. Correlations between the different gases are analysed and compared to literature data.