scholarly journals Hydrogen peroxide in the marine atmospheric boundary layer during the Atlantic Stratocumulus Transition Experiment/Marine Aerosol and Gas Exchange experiment in the eastern subtropical North Atlantic

1997 ◽  
Vol 102 (D5) ◽  
pp. 6003-6015 ◽  
Author(s):  
Daniel Martin ◽  
Maria Tsivou ◽  
Bernard Bonsang ◽  
Christian Abonnel ◽  
Thomas Carsey ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Hydrogen Peroxide ◽  
Gas Exchange ◽  
Atmospheric Boundary Layer ◽  
North Atlantic ◽  
Marine Aerosol ◽  
Marine Atmospheric Boundary Layer

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

2013 ◽  
Vol 13 (13) ◽  
pp. 6345-6357 ◽  
Author(s):  
S. Fuhlbrügge ◽  
K. Krüger ◽  
B. Quack ◽  
E. Atlas ◽  
H. Hepach ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Atlantic Ocean ◽  
Atmospheric Boundary Layer ◽  
Methyl Iodide ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Marine Atmospheric Boundary Layer ◽  
Regional Variability ◽  
Mixing Ratios ◽  
Upwelling Area

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).

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

2012 ◽  
Vol 12 (12) ◽  
pp. 31205-31245 ◽  
Author(s):  
S. Fuhlbrügge ◽  
K. Krüger ◽  
B. Quack ◽  
E. Atlas ◽  
H. Hepach ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Atlantic Ocean ◽  
Atmospheric Boundary Layer ◽  
Methyl Iodide ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Marine Atmospheric Boundary Layer ◽  
Diurnal Variability ◽  
Mixing Ratios ◽  
Upwelling Area

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. Highest VSLS mixing ratios were found near the Mauritanian coast and close to Lisbon (Portugal). Air mass origins were calculated with 5-day backward trajectories starting at the surface and at the boundary layer top. 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. 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 diurnal variability up to 50% for bromoform, 26% for dibromomethane and 56% for methyl iodide. A relationship was found between the marine atmospheric boundary layer (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 MABL height variations are an important driver for VSLS mixing ratio variations and elevated atmospheric abundances and may explain the so far observed missing VSLS sources in this region.

scholarly journals Inference of Marine Atmospheric Boundary Layer Moisture and Temperature Structure Using Airborne Lidar and Infrared Radiometer Data

1998 ◽  
Vol 37 (3) ◽  
pp. 308-324 ◽  
Author(s):  
Stephen P. Palm ◽  
Denise Hagan ◽  
Geary Schwemmer ◽  
S. H. Melfi
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Potential Temperature ◽  
Airborne Lidar ◽  
Temperature Structure ◽  
Marine Atmospheric Boundary Layer ◽  
Space Technology ◽  
Near Surface ◽  
Surface Moisture ◽  
Infrared Radiometer

Abstract A new technique for retrieving near-surface moisture and profiles of mixing ratio and potential temperature through the depth of the marine atmospheric boundary layer (MABL) using airborne lidar and multichannel infrared radiometer data is presented. Data gathered during an extended field campaign over the Atlantic Ocean in support of the Lidar In-space Technology Experiment are used to generate 16 moisture and temperature retrievals that are then compared with dropsonde measurements. The technique utilizes lidar-derived statistics on the height of cumulus clouds that frequently cap the MABL to estimate the lifting condensation level. Combining this information with radiometer-derived sea surface temperature measurements, an estimate of the near-surface moisture can be obtained to an accuracy of about 0.8 g kg−1. Lidar-derived statistics on convective plume height and coverage within the MABL are then used to infer the profiles of potential temperature and moisture with a vertical resolution of 20 m. The rms accuracy of derived MABL average moisture and potential temperature is better than 1 g kg−1 and 1°C, respectively. The method relies on the presence of a cumulus-capped MABL, and it was found that the conditions necessary for use of the technique occurred roughly 75% of the time. The synergy of simple aerosol backscatter lidar and infrared radiometer data also shows promise for the retrieval of MABL moisture and temperature from space.

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