Frank Dehairs’s multi-proxy team

The Southern Ocean Water Mass Circulation and Biogeochemistry

• Stéphanie Jacquet (ANCH)

• Marc Elskens (ANCH)

• Anne Julie Cavagna (ANCH)

• Damien Cardinal (MRAC , Tervuren)

The Southern Ocean

• 18 % of the World Ocean, circumpolar distribution• Active hydrological and ecological dynamics

Key role in the global C cycle and climatic changes

CO2 , HCO3-

NO3-, NH4

+, urea

Si(OH)415N, 13,14C, 30,32Si, algae biomarkers

234Th

Baxs

Surface layer

Mesopelagic Zone

Deep water

Bottom

F ratio, new production,Pk communitiesC Export production

C remineralization

Water mass pathway+

Better constrain the Baxs proxy

Bad

Atmosphere

100m

1000m

Multi-proxy approach to assess C export and mineralization

CO2

Analytical part:

* Isotope dilution method

* ICP-MS and HR-ICP-MS instruments

(inductively coupled plasma mass spectrometry)

* Optimization of the method on the HR-ICP-MS instrument

30°S

40°S

50°S

60°S

20°S

Anta rc tic

Peninsula

Ka p pNorve g iaWe d d e ll Ba sin

Sc o tia Sea

So uthSa nd wic hIsla nd s

So uth G e org ia

South Sc otia Rid g e

End e rb y Ba sin

Southwest Ind ia n Ridge

North We d d e ll Rid g e

70°W

60°W

50°W

40°W30°W 20°W 10°W

0°

10°E

20°E

30°E

70°S

70°S

60°S

60°S

50°S

50°S

Anta rc tic a

NM

M a ud Rise

J

J o invilleIsla nd

Ba sin Powe ll

ANT XXII/3; Weddell sea

Master Thesis proposal2006-2007

“ Dissolved barium to investigate the water mass pathways in the Southern Ocean and better constrain the Baxs proxy “

Analysis of dissolved Barium in seawater and comparison of Ba results with the other physical and biogeochemical water mass properties.

If you’re interested in•Analytical chemistry & biogeochemistry

•The southern Ocean•The global C cycle & climatic changes

If you’re interested in doing research

... Fell free to contact us with any questions !

Thank you