GEOTRACES 40 o S Cruise Planning Meeting Oxford, 24th March 2009.
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Transcript of GEOTRACES 40 o S Cruise Planning Meeting Oxford, 24th March 2009.
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are needed to see this picture.GEOTRACES40oS Cruise Planning Meeting
Oxford, 24th March 2009
Published in late 2006
Download PDF fromhttp://www.geotraces.org/Or hard copies available here
(also substantially replicated in Chemie de Erde paper in your workshop folders)
Science Plan
Mission
GEOTRACES guiding mission
To identify processes and quantify fluxes that control the distributions of key trace elements and isotopes (TEIs) in the ocean, and to establish the sensitivity of these distributions to changing environmental conditions.
Mission
What are “key” elements?
They include:- Those acting as micronutrients to control
ocean productivity and ecosystems- Those tracing modern processes in the
ocean- Contaminants in the present and future
ocean- Chemical species used as proxies to
reconstruct past climate
Mission
Include, but not limited to…
Mission
ProposedAtlanticsections
Some GEOTRACES news
“Enabling”-Second US-led intercalibration cruise will sail in May/June-Data management is set up at BODC jointly funded by NERC and NSF-The IPO is funded and will be set up in Toulouse-An ESF COST Action is enabling a networking and meetings across Europe
The actual science:Successful IPY cruises have occurred in 2008, more in 2009Germany will sail tropical Atlantic cruise in 2010USA will sail A03 during 2010Netherlands will sail some of A01 during 2010UK will sail A10 during 2010UK proposal for A06 is under review
The UK 40oS Atlantic Cruise
Henderson, Mills, Pancost and Rickaby(Oxford, NOCS, Bristol)Submitted standard NERC proposal to Dec 2007 round
Funded 32 day cruise plus calibration work on four paleoproxies:-Pa/Th-Cd-Si isotopes-Organic biomarkers
The two points to this meeting:
1. Fill this cruise with as much good science as possible (with GEOTRACES theme)
2. Plan funding for this research, including a NERC consortium proposal for July 1st 2010
An intro to 40oS in the Atlantic
Crosses deep basins (Argentine and Cape) and Mid-Atlantic Ridge
Comparison with WOCE
An intro to 40oS in the Atlantic
Productive region with appreciable sedimentation
An intro to 40oS in the Atlantic
Samples major deep water masses in Atlantic
Iron as a limiting nutrient in HNLC regions
Iron as a limiting nutrient in HNLC regions
Input fluxes of bioactive metals
DataLimited for Fe
Present ignorance: Existing deep ocean Fe data
Stations with Fe concentrations at depths > 2000 m.As of 2003. From P. Parekh (MIT)
Paucity of information about deep Fe distribution limits understanding of upwelling supply and internal cycling.
Other essential TEIs
Iron is not the only trace metal crucial for ocean biology
Figure from F. Morel
Deep-water supply to productive regions
Sources of micronutrients to oceans
Dust inputs are uncertain…
Substantial river input
MAR inputs are likely
de Baar et al. Zero and Drake cruise
Mission
ProposedAtlanticsections
MAR inputs are likely
de Baar et al. Zero and Drake cruise
Margin sediments with somewhat varied conditions
Tracing sources of metals
E.g.
REEs and Al in
Equatorial Pacific
(Yang et al)
Short-lived radioisotopes, Mn, radiogenic isotopes (Nd, Pb)
Sources of micronutrients to oceans
Provide nutrients for richly productive and varied region
DataLimitsModels
Constraining fluxes with models
(Parekh et al. 2005)
Some things to consider:
Cruise co-ordination and logistics
Equipment for clean sampling and shipboard analysis
Wire time and water budget
Funding
Will need to make tough choices re. berths, water, budgets
Two possible cruise tracks (approximate!)