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Project CCP1

Aerosol-induced feedbacks in the Earth system

J.-B. W. Stuut, U. Merkel, G. Fischer
H. Fischer, M. H. Iversen, G. Mollenhauer, C. Vogt, M. Zabel

Staff

The aim is to develop a mechanistic understanding of the transport processes of dust and to shed light on the impact of dust deposition on marine environmental processes as a key element in the biogeochemistry of the Earth system, by combining dust records with remote sensing and climate modeling.

 
 

Large uncertainties remain in our understanding of the different roles of mineral aerosols in the climate system (IPCC 2007). In addition to affecting the Earth’s radiative balance, it has been suggested that mineral dust plays an important role in marine biogeochemical cycles through fertilization (e.g. Bishop et al. 2002) and ballasting effects (e.g. Armstrong et al. 2009). To enhance the knowledge base, a multi-disciplinary approach to the study of Saharan dust deposited off the northwest African coast and its impact on the North Atlantic is proposed. The project will combine expertise from OC (on climate modeling and dust-flux reconstructions), SD (on dust mobilization, transport and deposition), and GB (on ballasting) with information from remote sensing. In addition to the interactions with biogeochemical processes, we aim to quantify dust-related changes of SST (Evan et al. 2009).

Key Hypotheses

  • Mineral aerosol deposition has significant impact on ocean fertilization, ballasting, and related feedbacks.
  • The cooling effect of mineral aerosols on the upper ocean off NW Africa is sufficiently large to induce a positive feedback on dust mobilization via reduced rainfall.

Specific Methods

  • Assessment of deposition processes using marine sediment traps off Cape Blanc, the dust-collecting buoy off Cape Blanc, and the dust station on Barbados
  • Use of an appropriate set of specific dust-climate and sediment-transport model experiments to assess feedbacks between mineral aerosols and climate (in close cooperation with Project OC2)

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