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. Trace gas maps retrieved from satellite measurements show enhancedlevels of the atmospheric volatile organic compounds formaldehyde( HCHO ) and glyoxal ( CHOCHO ) over the Atlantic Ocean. Tovalidate the spatial distribution of this continental outflow, ship-basedmeasurements were taken during the Continental Outflow of Pollutantstowards the MArine tRoposphere (COPMAR) project. A Multi-AXis Differential OpticalAbsorption Spectrometer (MAX-DOAS) was operated aboard the research vessel(RV) Maria S. Merian during cruise MSM58/2. This cruise wasconducted in October 2016 from Ponta Delgada (Azores) to Cape Town (SouthAfrica), crossing between Cabo Verde and the African continent. Theinstrument was continuously scanning the horizon, looking towards the Africancontinent. Enhanced levels of HCHO and CHOCHO were found in thearea of expected outflow during this cruise. The observed spatial gradientsof HCHO and CHOCHO along the cruise track agree with thespatial distributions from satellite measurements and the Model for OZone and Related chemical Tracers version 4 (MOZART-4) modelsimulations. The continental outflow from the African continent is observedin an elevated layer, higher than 1000 m, and probably originates frombiogenic emissions or biomass burning according to FLEXible PARTicle dispersion model (FLEXPART) emissionsensitivities.

Detection of outflow of formaldehyde and glyoxal from the African continent to the Atlantic Ocean with a MAX-DOAS instrument