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Theme 3

Oceanic responses to atmospheric drivers

Trace metal flux via dust deposition

Dust deposition is the major source of mineral nutrients in remote oceanic regions that are not directly influenced by land erosion. The input of trace species such as iron or phosphorus from minerals can significantly alter the ocean biogeochemical cycles and, thus, in the long term influence the feedback and emissions of the ocean.
In SOPRAN III the investigation of mineral dust and trace metal flux is addressed in subprojects with the aim to
•    Investigate the effect of dust on radiative transfer and the long term effect on the ocean biology and phytoplankton development. (3.4 H. Siegel / T. Ohde, 3.5 D. Stammer)
•    Quantify the amount of trace metals and their chemical forms that are deposited into the ocean and understand the factors that control trace metal (especially iron) solubility in both the ocean and the atmosphere. (3.6 H. Herrmann / A. Wiedensohler, 3.7 C. Völker / D. Wolf-Gladrow)
•    Modell the dust transport from the source regions to the sub-tropical Atlantic using remote sensing and a regional model COSMO-MUSCAT. (3.8 I. Tegen, 3.9 C. Garbe)


Subprojects


3.1: Impacts of ocean acidification: complementing and synthesizing the SOPRAN mesocosm dataset (U. Riebesell)
3.2: Data-model synthesis of ocean acidification mesocosm experiments – Establishing a mesocosm modelling workbench (M. Schartau / A. Oschlies)

3.3: Effects of ocean acidification on trace metal cycling and bioavailability – clarifying the dust chain (K. Wuttig)
3.4: Dust impact on radiative transfer, optical properties and phytoplankton development - Improved analyses and synthesis in cooperation with other sub-projects (H. Siegel / T. Ohde)
3.5: Synthesis of Cap Verdes radiation measurements with respect to Sahara dust impact on the ocean surface radiation budget (D. Stammer)
3.6: Aerosol-Ocean Interaction: Oceanic Import of Dust (H. Herrmann / A. Wiedensohler)
3.7: Determinants of the bioavailability of iron from dust input: CDOM, reactive oxygen, ligands, and acidification (C. Völker / D. Wolf-Gladrow)
3.8: Regional modelling of Saharan dust export to the tropical Atlantic (I. Tegen)


Theme leaders:
Ulf Riebesell, GEOMAR; uriebesell@geomar.de
Hartmut Herrmann, TROPOS, IfT Leipzig; hartmut.herrmann@tropos.de