UK GEOTRACES 40° S Atlantic Ocean Water column Biogeochemistry

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Presentation transcript:

UK GEOTRACES 40° S Atlantic Ocean Water column Biogeochemistry Eric Achterberg and Mark Moore

Modelled dust deposition (Mahowald, 2006)

Surface water dissolved Fe and Al along AMT17 DAl (nM) DFe (nM) dFe/Dal Micha Rijkenberg&Simon Ussher Moore et al., submitted

ID-ICP-MS Isotope dilution-inductively coupled plasma-mass spectrometry 6 elements - not suitable for mono-isotopic elements Can be used for Ag, Cd, Cu, Fe, Ni, Pb, Zn Off-line preconconcentration Single sample - 8 minutes extraction Use of isotopic ratio E.g. Fe56 (natural) and Fe57 (spike)

Preconcentration 12 ml sample Spiked with isotope mixture - 100 µl isotope mix - Standard addition - Buffer 1.5 M HNO3 12 ml sample Spiked with isotope mixture Standard addition for mono-isotopic elements (Al, Co, Mn) Chelating resin  1 ml elution

Accuracy Accuracy verified by intercalibration samples from SAFe project and Geotraces project

East and West edges

Cadmium

Cadmium

Cd vs. P Cadmium as a tracer fro paleophophorus concentrations Next slide put in historic Cd/P ratio (figure from paper) and compare to this study, see how the ratios hold for this work

Hypothesis for 40°S consortium Bioactive trace elements control productivity along 40ºS in the Atlantic Ocean. The bioactive trace elements are intimately involved in various physical-biogeochemical feedback loops that influence our climate

Objectives Determine deep water TEI supply from diapycnal mixing and upwelling (incl. turbulence measurements) Identify sources of TEI to the region through tracer measurements (Al, Ti, Mn) Establish natural microbial community structure Determine nitrogen fixation rates Establish trace elements and nutrient streams through modelling

Conclusions ID-ICP-MS - powerful technique for high accuracy multi-element detection in low volumes of seawater HNLC status of region results in preferential removal of Fe in surface waters relative to other elements Strong correlation observed between Cd and phosphate (in agreement with literature) Mn confirms sedimentary source of Fe for Kerguelen region