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Fuhlbruegge, Steffen; Krüger, Kirstin; Quack, Birgit; Atlas, Elliot L; Hepach, Helmke; Ziska, Franziska (2013): Underway measurements of halocarbons (air) during POSEIDON cruise POS399 in June 2010. PANGAEA,, Supplement to: Fuhlbruegge, S et al. (2013): Impact of the marine atmospheric boundary layer conditions on VSLS abundances in the eastern tropical and subtropical North Atlantic Ocean. Atmospheric Chemistry and Physics, 13(13), 6345-6357,

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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).
Median Latitude: 21.017111 * Median Longitude: -17.916075 * South-bound Latitude: 17.595911 * West-bound Longitude: -24.308262 * North-bound Latitude: 40.243931 * East-bound Longitude: -9.509456
Date/Time Start: 2010-06-03T23:00:00 * Date/Time End: 2010-06-23T11:58:00
Minimum ALTITUDE: 14 m * Maximum ALTITUDE: 14 m
POS399/2-track * Latitude Start: 28.115450 * Longitude Start: -15.408700 * Latitude End: 28.138630 * Longitude End: -15.422700 * Date/Time Start: 2010-05-31T00:00:00 * Date/Time End: 2010-06-17T00:00:00 * Location: Eastern Tropical North Atlantic * Campaign: POS399/2 (23-10) * Basis: Poseidon * Method/Device: Underway cruise track measurements (CT) * Comment: Las Palmas - Las Palmas
POS399/3-track * Latitude Start: 29.166780 * Longitude Start: -15.499200 * Latitude End: 42.230970 * Longitude End: -8.737280 * Date/Time Start: 2010-06-18T00:00:00 * Date/Time End: 2010-06-24T00:00:00 * Location: Eastern Tropical North Atlantic * Campaign: POS399/3 (23-10) * Basis: Poseidon * Method/Device: Underway cruise track measurements (CT) * Comment: Las Palmas - Vigo
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventFuhlbruegge, Steffen
2DATE/TIMEDate/TimeFuhlbruegge, SteffenGeocode
3LATITUDELatitudeFuhlbruegge, SteffenGeocode
4LONGITUDELongitudeFuhlbruegge, SteffenGeocode
5ALTITUDEAltitudemFuhlbruegge, SteffenGeocode
6DibromomethaneCH2Br2pptvFuhlbruegge, Steffen
7ChlorodibromomethaneCHClBr2pptvFuhlbruegge, Steffen
8BromoformCHBr3pptvFuhlbruegge, Steffen
9DichlorodifluoromethaneCCl2F2pptvFuhlbruegge, Steffen
10TrichlorfluormethanCCl3FpptvFuhlbruegge, Steffen
111,1,2-Trichloro-1,2,2-trifluoroethaneC2Cl3F3pptvFuhlbruegge, Steffen
121,2-DichlorotetrafluoroethaneC2Cl2F4pptvFuhlbruegge, Steffen
13ChlorodifluoromethaneCHClF2pptvFuhlbruegge, Steffen
141-Chloro-1,1-difluoroethaneCH3CClF2pptvFuhlbruegge, Steffen
151,1-Dichloro-1-fluoroethaneC2H3Cl2FpptvFuhlbruegge, Steffen
161-Chlor-1,2,2,2-tetrafluorethanC2HClF4pptvFuhlbruegge, Steffen
171,1,1,2-TetrafluoroethaneCH2FCF3pptvFuhlbruegge, Steffen
181,1-DifluoroethaneC2H4F2pptvFuhlbruegge, Steffen
19BromochlorodifluoromethaneCBrClF2pptvFuhlbruegge, Steffen
201,2-DibromotetrafluoroethaneC2Br2F4pptvFuhlbruegge, Steffen
21Dimethyl sulfate(CH3O)2SO2pptvFuhlbruegge, Steffen
22Carbonyl sulfideCOSpptvFuhlbruegge, Steffen
23PropaneC3H8pptvFuhlbruegge, Steffen
24Isobutanei-C4H10pptvFuhlbruegge, Steffen
25n-Butanen-C4H10pptvFuhlbruegge, Steffen
26Isopentanei-C5H12pptvFuhlbruegge, Steffen
27n-Pentanen-C5H12pptvFuhlbruegge, Steffen
28n-Hexanen-C6H14pptvFuhlbruegge, Steffen
29IsopreneC5H8pptvFuhlbruegge, Steffen
30BenzeneC6H6pptvFuhlbruegge, Steffen
31TolueneC6H5CH3pptvFuhlbruegge, Steffen
32ChloromethaneCH3ClpptvFuhlbruegge, Steffen
33BromomethaneCH3BrpptvFuhlbruegge, Steffen
34Methyl iodideCH3IpptvFuhlbruegge, Steffen
35DichloromethaneCH2Cl2pptvFuhlbruegge, Steffen
36ChloroformCHCl3pptvFuhlbruegge, Steffen
371,2-DichloroethaneC2H4Cl2pptvFuhlbruegge, Steffen
38Methyl ChloroformCH3CCl3pptvFuhlbruegge, Steffen
39TetrachlormethanCCl4pptvFuhlbruegge, Steffen
40TetrachloroethyleneC2Cl4pptvFuhlbruegge, Steffen
41Methyl nitrateCH3NO3pptvFuhlbruegge, Steffen
42Ethyl nitrateC2H5NO3pptvFuhlbruegge, Steffen
43Isopropyl nitrateC3H7NO3pptvFuhlbruegge, Steffen
44n-Propyl nitrateC3H7NO3pptvFuhlbruegge, Steffen
45sec-Butyl nitrateC4H9NO3pptvFuhlbruegge, Steffen
46Methyl acetateC3H6O2pptvFuhlbruegge, Steffen
7351 data points

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