GEOTRACES WORKING GROUP 11-12 September 2007
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GEOTRACES WORKING GROUP 11-12 September 2007 ATLANTIC OCEAN TROPICAL-SUBTROPICAL REGION PowerPoint PPT Presentation


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GEOTRACES WORKING GROUP 11-12 September 2007 ATLANTIC OCEAN TROPICAL-SUBTROPICAL REGION Chair Bill Landing Raporteur Eric Achterberg Group members: Bill Jenkins Peter Croot Peter Sedwick Simon Ussher Walter Geibert Armando Ramirez Pere Masque Tom Church Jana Friedrich. Overall plan

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GEOTRACES WORKING GROUP 11-12 September 2007 ATLANTIC OCEAN TROPICAL-SUBTROPICAL REGION

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GEOTRACES WORKING GROUP 11-12 September 2007

ATLANTIC OCEAN TROPICAL-SUBTROPICAL REGION

Chair Bill Landing

Raporteur Eric Achterberg

Group members:

Bill Jenkins

Peter Croot

Peter Sedwick

Simon Ussher

Walter Geibert

Armando Ramirez

Pere Masque

Tom Church

Jana Friedrich


Overall plan

We propose to undertake 2 transects:

Transect one will form part of a dust/Fe plume study cruise (possibly TEI-microbial)

Transect two will be part of a western boundary cruise

Stations are proposed at 2 degrees intervals. Not all stations will be full depth (1800 m).

We will undertake high resolution shallow casts and lower resolution deep casts to characterize deep water masses.


  • Important research goals are:

  • Link atmospheric TEI concentrations to dissolved and particulate TEI concentrations in the region under the Saharan dust plume.

  • Investigate the mechanisms for the maintenance of the tropical Fe plume, and Fe transport into and out of the plume. Is in-situ generation or lateral advection the most important process?

  • Investigate control of ocean productivity by TEIs

  • Characterise chemistry of N Atlantic deep water complex, and observe Antarctic Bottom Water


Considerations

Cruise track 1

-The dust cruise should take place in a period of year with enhanced atmospheric dust concentrations.

-We envisage the deployments of LIDAR on the cruises for ship-board aerosol observations.

-UK GEOTRACES proposal will have to be hypothesis driven, with consideration for linking micronutrient distributions and supply-removal to microbial processes and distributions. Consequently such a programme will consider a north-south transect.

Cruise track 2

-We will undertake a cross transect in the western basin to characterize deep water masses.

-It is envisaged that stations will be occupied in the Amazone river plume and in the Cariaco Basin region (to study isolated suboxic basin system).

-Seamounts will be included in the cruise track to study the impact of the nephloid layer on water column TEI concentrations and undertake proxy studies.

-Stations over hydrothermal vents on the mid-Atlantic ridge will be included to investigate dissolved and particulate TEI signatures


Links to other Transect

-Germans run north-south cruises on 23ºW. Peter Croot is contact person.

-Low oxygen studies (1 funded and 1 under review) Peter Croot is contact person.

-Extended W transect out of Cape Cod, via Bermuda to Barbados will form ideal link-up transect for our region.

-Cruise transect into the Angolan Basin will form ideal link-up for our region.

-We will attempt to re-occupy TTO and GEOSECS stations

-We envisage that the influence of the Romanche Fracture zone on deep waters will be investigated in other group proposals (Angolan Basin work).


GEOSECS sections


TTO sections


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