VSLS measurementsin the tropical East Atlantic

Steffen Fuhlbrügge, Kirstin Krüger, Birgit Quack, Elliot Atlas,Helmke Hepach, Franziska Wittke and the DRIVE-Poseidon Team

14.07.2011

DRIVE: HySplit 10-day backward trajectories

HySplit calculations-- start of the cruise-- end of the cruise

Air sample analysis: Elliot AtlasFlux calculations: Helmke Hepach, PhD thesis

CHBr3:atmospheric concentrations [ppt]and air-sea flux (pmol/(m²*hr)]

Leg 2 CHBr3: atmospheric concentration Leg 2 CHBr3: air-sea fluxpptpmol

(m²*hr)

Leg 3 CHBr3: atmospheric concentration ppt

Air sample analysis: Elliot AtlasFlux calculations: Helmke Hepach, PhD thesis

CH2Br2:atmospheric concentrations [ppt]and air-sea flux (pmol/(m²*hr)]

Leg 3 CH2Br2: atmospheric concentration ppt

Leg 2 CH2Br2: atmospheric concentration Leg 2 CH2Br2: air-sea fluxpptpmol

(m²*hr)

Air sample analysis: Elliot AtlasFlux calculations: Helmke Hepach, PhD thesis

CH3I:atmospheric concentrations

[ppt]

Leg 2 CH3I: atmospheric concentration ppt

Leg 3 CH3I: atmospheric concentration ppt

CHBr3:MLH = -0.94CH2Br2:MLH = -0.94

CH3I:MLH = -0.54CHBr3:CH2Br2 = 0.97

CHBr3:CH3I = 0.69CH3I:CH2Br2 = 0.74

Correlations:

Date= 24 h station

Comparison/Correlation of trace gases and mixing layer height

Air mass classification: Open ocean5-day backward trajectories

1. station 2. station 3. station

CHBr

3

Air mass classification: Coast1-day backward trajectories

4. station 5. station 6. station

CHBr

3pp

t

1

rwd = 0.85

= 24 h station

Lower values ≈ younger sources