14.07.2011
VSLS measurements
in the tropical East Atlantic
Steffen Fuhlbrügge, Kirstin Krüger, Birgit Quack, Elliot Atlas,
Helmke Hepach, Franziska Wittke and the DRIVE-Poseidon Team
DRIVE: HySplit 10-day backward trajectories
HySplit calculations
-- start of the cruise
-- end of the cruise
Leg 2 CHBr3: atmospheric concentration ppt
Leg 3 CHBr3: atmospheric concentration
Leg 2 CHBr3: air-sea flux
pmol
(m²*hr)
ppt
CHBr3:
atmospheric concentrations [ppt]
and air-sea flux (pmol/(m²*hr)]
Air sample analysis: Elliot Atlas
Flux calculations: Helmke Hepach, PhD thesis
Leg 2 CH2Br2: atmospheric concentrationppt
Leg 3 CH2Br2: atmospheric concentration
Leg 2 CH2Br2: air-sea flux
pmol
(m²*hr)
ppt
CH2Br2:
atmospheric concentrations [ppt]
and air-sea flux (pmol/(m²*hr)]
Air sample analysis: Elliot Atlas
Flux calculations: Helmke Hepach, PhD thesis
Leg 2 CH3I: atmospheric concentration
ppt
Leg 3 CH3I: atmospheric concentration
CH3I:
atmospheric concentrations
[ppt]
ppt
Air sample analysis: Elliot Atlas
Flux calculations: Helmke Hepach, PhD thesis
Comparison/Correlation of trace gases and mixing layer height
Correlations:
= 24 h station
Date
CHBr3:MLH = -0.94
CH2Br2:MLH = -0.94
CH3I:MLH = -0.54
CHBr3:CH2Br2 = 0.97
CHBr3:CH3I = 0.69
CH3I:CH2Br2 = 0.74
Air mass classification: Open ocean
5-day backward trajectories
CHBr3
1. station
2. station
3. station
Air mass classification: Coast
1-day backward trajectories
4. station
5. station
ppt
CHBr3
1
rwd = 0.85
6. station
Lower values ≈ younger sources
= 24 h station