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Title: Diagnostic modeling of dimethylsulfide production in coastal water west of the Antarctic Peninsula
Authors: Herrmann, Maria, Najjar, R.G., Neeley, Aimee R., Vila-Costa, Maria, Dacey, J.W.H., DiTullio, G.R., Kieber, David j., Kiene, Ronald P., Matrai, P.A., Simó, Rafel, Vernet, Maria
Keywords: Dimethylsulfide
Antarctic Peninsula
Palmer Station
Issue Date: Jan-2012
Publisher: Elsevier
Abstract: The rate of gross biological dimethylsulfide (DMS) production at two coastal sites west of the Antarctic Peninsula, off Anvers Island, near Palmer Station, was estimated using a diagnostic approach that combined field measurements from 1 January 2006 through 1 March 2006 and a one-dimensional physical model of ocean mixing. The average DMS production rate in the upper water column (0–60 m) was estimated to be 3.1±0.6 nM d−1 at station B (closer to shore) and 2.7±0.6 nM d−1 at station E (further from shore). The estimated DMS replacement time was on the order of 1 d at both stations. DMS production was greater in the mixed layer than it was below the mixed layer. The average DMS production normalized to chlorophyll was 0.5±0.1 (nM d−1)/(mg m−3) at station B and 0.7±0.2 (nM d−1)/(mg m−3) at station E. When the diagnosed production rates were normalized to the observed concentrations of total dimethylsulfoniopropionate (DMSPt, the biogenic precursor of DMS), we found a remarkable similarity between our estimates at stations B and E (0.06±0.02 and 0.04±0.01 (nM DMS d−1)/(nM DMSP), respectively) and the results obtained in a previous study from a contrasting biogeochemical environment in the North Atlantic subtropical gyre (0.047±0.006 and 0.087±0.014 (nM DMS d−1)/(nM DMSP) in a cyclonic and anticyclonic eddy, respectively). We propose that gross biological DMS production normalized to DMSPt might be relatively independent of the biogeochemical environment, and place our average estimate at 0.06±0.01 (nM DMS d−1)/(nM DMSPt). The significance of this finding is that it can provide a means to use DMSPt measurements to extrapolate gross biological DMS production, which is extremely difficult to measure experimentally under realistic in situ conditions.
Description: 14 pages, 10 figures, 3 tables.
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ISSN: 0278-4343
???metadata.dc.identifier.doi???: 10.1016/j.csr.2011.10.017
Citation: Continental Shelf Research 32 (1): 96-109 (2012)
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