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Specific Cruise Objectives

Draft Form for Discussion

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» Proposed Station Positions

» Station Time Table
Compiled by Ed Boyle

GEOTRACES ATLANTIC SECTION OBJECTIVES, GOALS, HYPOTHESES
 Ordered as discussed… 

1. Aerosol deposition and rain for TEIs with a significant atmospheric source (?sink?)
             - emphasize techniques for establishing source and provenance (Nd, Pb isotopes, - aerosol deposition (?rain?) is particularly relevant for the North Atlantic because of strong aerosol dust and anthropogenic sources (?210Pb?)- also note that nitrate N isotopes may illuminate N cycle- water consequences: Al, 232Th, Mn, Hg 

2. Ventilation: this factor is important for TEIs in N. Atlantic, but not well-quantified
 - use CFCs, SF6 (?3He, 14C?) ?would CLIVAR be interested in paying for sample collection and analysis?- link to Pb and Pb isotopes as a chemically active transient tracer- Nd isotopes and paleoventilation interpretations- 231Pa, 230Th as tracers of boundary scavenging and ventilation 

3. Boundary processes; lateral inputs from continental margins
 Important in Atlantic because of nepheloid layers and broad shelves (also note issue of Nd isotope exchange). Need for closely spaced near-bottom samples. Ra isotopes, Al for close-spaced near bottom samples, 232Th, 228Th, FeInputs from abyssal sediments 

4. Mode water formation and its influence on TEI distributions (Al, Pb, 3He/3H, CFCs, SF6)
 

5. Trace element association with dominant phases
 - scavenging (all Th, 210Pb, 210Po, Nd, REE, iso)- SiO2, MnO2 [southern track advantage] and Fe2O3 as scavengers (?selective leaches?)- biogenic phases; remineralization functions 

6. Hydrothermal inputs – importance of slow-spreading ridges for deeper mantle rock sources sink of TEI from ocean. ?Hg?.
 

7. Effect of Mediterranean water on TEI distributions (Al & other atm elements, Pb, Pb isotopes, Nd isotopes; 228Ra anomaly); Med outflow end-member; exchange w/bottom seds
 

8. surface Al gradient between eastern and western N. Atlantic: why is this there, does it have implications for other TEI?
 

9.
d13C as a critical GT parameter – what is its importance in N. Atlantic (paleo tracer?) 

10. trace element / nutrient correlations (Cd, Zn, Co), paleoceanographic implications
 

11. Redox processes near OMZ, boundary sediments
 

Last updated: September 26, 2008
 


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