Light-driven cycling of dimethylsulfide (DMS) in the Sargasso Sea : closing the loop
Toole, Dierdre A.
Siegel, David A.
MetadataShow full item record
The factors driving dimethylsulfide (DMS) cycling in oligotrophic environments are isolated using a time-series of DMS sampled in the Sargasso Sea. The observed distribution of DMS is inconsistent with bottom-up processes related to phytoplankton production, biomass, or community structure changes. DMS concentrations and estimates of net biological community production are most highly correlated with physical and optical properties, with the dose of ultraviolet radiation (UVR) accounting for 77% of the variability in mixed layer DMS concentrations. Physiological stresses associated with shallow mixed layers and high UVR are the first order determinant of biological production of DMS, indicating that DMS cycling in open-ocean regions is fundamentally different than in eutrophic regions where phytoplankton blooms provide the conditions for elevated DMS concentrations. The stress regime presented here effectively closes the DMS-climate feedback loop for open-ocean environments. This response may also provide a climatic role for phytoplanktonic processes in response to anthropogenic forcing.
Author Posting. © American Geophysical Union, 2004. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 31 (2004): L09308, doi:10.1029/2004GL019581.
Showing items related by title, author, creator and subject.
Gradients in dimethylsulfide, dimethylsulfoniopropionate, dimethylsulfoxide, and bacteria near the sea surface Zemmelink, Hendrik J.; Houghton, Leah; Sievert, Stefan M.; Frew, Nelson M.; Dacey, John W. H. (Inter-Research, 2005-06-23)Gradients of dimethylsulfide (DMS), dimethylsulfoniopropionate (DMSP), dimethylsulfoxide (DMSO), and bacterial numbers and diversity from the surface microlayer to 500 cm depth were assessed in coastal waters surrounding ...
Ledyard, Kathleen Mei (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1993-02)Dimethylsulfide (DMS) plays a central role in the transfer of sulfur from the ocean to the atmosphere, and ultimately to land. The most abundant volatile organosulfur compound in seawater, DMS is believed to account for ...
Dimethylsulfoniopropionate in six species of giant clams and the evolution of dimethylsulfide after death Hill, Richard W.; Dacey, John W. H.; Hill, Susan D.; Edward, Ahser; Hicks, Wayne A. (National Research Council Canada, 2004-06-23)Substantial accumulation of dimethylsulfoniopropionate (DMSP) is documented in tissues of all six of the common species of giant clams (Tridacnidae). Results include measures of DMSP concentrations in siphonal mantle, ...