In:
Atmospheric Chemistry and Physics, Copernicus GmbH, Vol. 19, No. 15 ( 2019-08-13), p. 10257-10278
Abstract:
Abstract. Trace gas maps retrieved from satellite measurements show enhanced
levels of the atmospheric volatile organic compounds formaldehyde
(HCHO) and glyoxal (CHOCHO) over the Atlantic Ocean. To
validate the spatial distribution of this continental outflow, ship-based
measurements were taken during the Continental Outflow of Pollutants
towards the MArine tRoposphere (COPMAR) project. A Multi-AXis Differential Optical
Absorption Spectrometer (MAX-DOAS) was operated aboard the research vessel
(RV) Maria S. Merian during cruise MSM58/2. This cruise was
conducted in October 2016 from Ponta Delgada (Azores) to Cape Town (South
Africa), crossing between Cabo Verde and the African continent. The
instrument was continuously scanning the horizon, looking towards the African
continent. Enhanced levels of HCHO and CHOCHO were found in the
area of expected outflow during this cruise. The observed spatial gradients
of HCHO and CHOCHO along the cruise track agree with the
spatial distributions from satellite measurements and the Model for OZone and Related chemical Tracers version 4 (MOZART-4) model
simulations. The continental outflow from the African continent is observed
in an elevated layer, higher than 1000 m, and probably originates from
biogenic emissions or biomass burning according to FLEXible PARTicle dispersion model (FLEXPART) emission
sensitivities.
Type of Medium:
Online Resource
ISSN:
1680-7324
DOI:
10.5194/acp-19-10257-2019
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2019
detail.hit.zdb_id:
2092549-9
detail.hit.zdb_id:
2069847-1
