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Journal article

Impact of the marine atmospheric boundary layer conditions on VSLS abundances in the eastern tropical and subtropical North Atlantic Ocean

Fuhlbruegge S, Krueger K, Quack B, Atlas E, Hepach H, Ziska F ...see all

ATMOSPHERIC CHEMISTRY AND PHYSICS, vol. 13, issue 13 (2013) pp. 6345-6357

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Abstract

During the DRIVE (Diurnal and Regional Variability of Halogen Emissions)
ship campaign we investigated the variability of the halogenated very
short-lived substances (VSLS) bromoform (CHBr3), dibromomethane (CH2Br2)
and methyl iodide (CH3I) in the marine atmospheric boundary layer in the
eastern tropical and subtropical North Atlantic Ocean during May/June
2010. The highest VSLS mixing ratios were found near the Mauritanian
coast and close to Lisbon (Portugal). With backward trajectories we
identified predominantly air masses from the open North Atlantic with
some coastal influence in the Mauritanian upwelling area, due to the
prevailing NW winds. The maximum VSLS mixing ratios above the
Mauritanian upwelling were 8.92 ppt for bromoform, 3.14 ppt for
dibromomethane and 3.29 ppt for methyl iodide, with an observed maximum
range of the daily mean up to 50% for bromoform, 26% for
dibromomethane and 56% for methyl iodide. The influence of various
meteorological parameters - such as wind, surface air pressure, surface
air and surface water temperature, humidity and marine atmospheric
boundary layer (MABL) height - on VSLS concentrations and fluxes was
investigated. The strongest relationship was found between the MABL
height and bromoform, dibromomethane and methyl iodide abundances.
Lowest MABL heights above the Mauritanian upwelling area coincide with
highest VSLS mixing ratios and vice versa above the open ocean.
Significant high anti-correlations confirm this relationship for the
whole cruise. We conclude that especially above oceanic upwelling
systems, in addition to sea-air fluxes, MABL height variations can
influence atmospheric VSLS mixing ratios, occasionally leading to
elevated atmospheric abundances. This may add to the postulated missing
VSLS sources in the Mauritanian upwelling region (Quack et al., 2007).

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Authors

  • S Fuhlbruegge

  • K Krueger

  • B Quack

  • E Atlas

  • H Hepach

  • F Ziska

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