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UP: Fachverband Umweltphysik

UP 9: Poster session

UP 9.3: Poster

Mittwoch, 7. März 2018, 16:15–18:15, Orangerie

MAX-DOAS measurements of African continental pollution outflow over the Atlantic Ocean — •Lisa K. Behrens¹, Hilboll Andreas^1,2, Peters Enno^1,3, Richter Andreas¹, Alvarado Leonardo¹, Wittrock Folkard¹, Burrows John P.¹, and Vrekoussis Mihalis^1,2 — ¹IUP, Bremen, Germany — ²MARUM, Bremen, Germany — ³DLR, Bremerhaven, Germany

Trace gas global maps retrieved from satellite measurements revealed enhanced levels of atmospheric key pollutants, namely nitrogen dioxide (NO₂), formaldehyde (HCHO) and glyoxal (CHOCHO) over the Atlantic Ocean. To validate the spatial distribution of the continental outflow, we conducted ship-based measurements during the DFG project COPMAR (Continental outflow of pollutants towards the marine troposphere). A multi-axis differential optical absorption spectrometer (MAX-DOAS) was installed on board the research vessel Maria S. Merian for the cruise MSM58/2. This cruise was conducted in October 2016 and went from Ponta Delgada (Azores) to Cape Town (South Africa), crossing between Cape Verde and the African continent. The instrument was continuously scanning the horizon looking towards the African continent. We investigated the temporal variability of the above three species, and identified their spatial gradients over the Atlantic Ocean. The observed spatial gradients of HCHO and CHOCHO along the cruise track have a similar spatial distribution as satellite measurements and as model simulations. Furthermore, possible sources of the discrepancies are discussed.