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High concentrations and turnover rates of DMS, DMSP and DMSO in Antarctic sea ice
Author(s) -
Asher Elizabeth C.,
Dacey John W. H.,
Mills Matthew M.,
Arrigo Kevin R.,
Tortell Philippe D.
Publication year - 2011
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2011gl049712
Subject(s) - oceanography , sea ice , geology , climatology , environmental science
The vast Antarctic sea‐ice zone (SIZ) is a potentially significant source of the climate‐active gas dimethylsulfide (DMS), yet few data are available on the concentrations and turnover rates of DMS and the related compounds dimethylsulfoniopropionate (DMSP) and dimethylsulfoxide (DMSO) in sea ice environments. Here we present new measurements characterizing the spatial variability of DMS, DMSP, and DMSO concentrations across the Antarctic SIZ, and results from tracer experiments quantifying the production rates of DMS from various sources. We observed extremely high concentrations (>200 nM) and turnover rates (>100 nM d −1 ) of DMS in sea‐ice brines, indicating intense cycling of DMS/P/O. Our results demonstrate a previously unrecognized role for DMSO reduction as a major pathway of DMS production in Antarctic sea ice.