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AGU: Global Biogeochemical Cycles

 

Keywords

  • climate change
  • dimethyl sulphide
  • solar variability

Index Terms

  • Biogeosciences: Biosphere/atmosphere interactions
  • Global Change: Biogeochemical cycles, processes, and modeling
  • Global Change: Solar variability
  • Global Change: Climate variability

Abstract

GLOBAL BIOGEOCHEMICAL CYCLES, VOL. 19, GB1014, 12 PP., 2005
doi:10.1029/2004GB002333

Solar variability, dimethyl sulphide, clouds, and climate

S. H. Larsen

C-Research, Lincoln, New Zealand

It is proposed that Earth's climate may be modulated, in part, by changes in the flux of ultraviolet/blue light into the oceans. This occurs, at a range of timescales, through solar variability and from damage to the ozone layer. A conceptual model is presented where, through a number of synergistic processes and positive feedbacks, changes in the ultraviolet/blue flux alter the dimethyl sulphide flux to the atmosphere, and in turn the number of cloud condensation nuclei, cloud albedo, and thus sea surface temperature. The greatest effects are expected in the oligotrophic subtropical oceans, under the Hadley circulation, in summer.

Received 7 July 2004; accepted 3 January 2005; published 19 February 2005.

Citation: Larsen, S. H. (2005), Solar variability, dimethyl sulphide, clouds, and climate, Global Biogeochem. Cycles, 19, GB1014, doi:10.1029/2004GB002333.

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