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Dimethylsulfide production variations over the past 200 k.y. in the equatorial Atlantic: A first estimate

¹ Division of Applied Geology, Luleå University of Technology, SE-971 87 Luleå, Sweden
² Geologisch-Paläontologisches Institut, University of Kiel, D-24 118 Kiel, Germany
³ Biogeochemistry Centre, Earth Sciences, University of Bristol, Bristol BS8 1TH, UK

Dimethylsulfide (DMS) released from phytoplankton produces cloud condensation nuclei in the marine troposphere, thereby providing a climate-regulating mechanism by increasing cloud albedo. A 200-k.y.-long sedimentary record from the equatorial Atlantic of DMS-producing phytoplankton suggests that DMS production increased during the glacial stages, thus potentially working to further cool the glacial world. Important factors limiting the operation of this possible feedback mechanism for planetary cooling may be the strength of trade winds and the availability of fine, iron-rich dust needed to fertilize growth of DMS producers.

Key Words: dimethylsulfide • phytoplankton • climate-regulation • equatorial Atlantic