VSLS measurements in the tropical East Atlantic

VSLS measurements

in 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 Atlas Flux calculations: Helmke Hepach, PhD thesis

CHBr

:

atmospheric concentrations [ppt]

and air-sea flux (pmol/(m²*hr)]

Leg 2 CHBr₃: atmospheric concentration_ppt Leg 2 CHBr₃: air-sea flux _(m²*hr)^pmol

Leg 3 CHBr₃: atmospheric concentration ppt

Air sample analysis: Elliot Atlas Flux calculations: Helmke Hepach, PhD thesis

CH

Br

:

atmospheric concentrations [ppt]

and air-sea flux (pmol/(m²*hr)]

Leg 3 CH₂Br₂: atmospheric concentration ppt

Leg 2 CH₂Br₂: atmospheric concentration_ppt Leg 2 CH₂Br₂: air-sea flux _(m²*hr)^pmol

Air sample analysis: Elliot Atlas Flux calculations: Helmke Hepach, PhD thesis

CH

I:

atmospheric concentrations [ppt]

Leg 2 CH₃I: atmospheric concentration ppt

Leg 3 CH₃I: atmospheric concentration ppt

CHBr

:MLH = -0.94 CH

Br

:MLH = -0.94 CH

I:MLH = -0.54 CHBr

:CH

Br

= 0.97 CHBr

:CH

I = 0.69 CH

I:CH

Br

= 0.74

Correlations:

= 24 h station Date

Comparison/Correlation of trace gases and mixing layer height

Air mass classification: Open ocean

5-day backward trajectories

1. station 2. station 3. station

C H B r

Air mass classification: Coast

1-day backward trajectories

4. station 5. station 6. station

C H B r

1

r_wd = 0.85

= 24 h station

Lower values ≈ younger sources