کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6383321 | 1626177 | 2012 | 14 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Research papersDiagnostic modeling of dimethylsulfide production in coastal water west of the Antarctic Peninsula Research papersDiagnostic modeling of dimethylsulfide production in coastal water west of the Antarctic Peninsula](/preview/png/6383321.png)
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 dâ1 at station B (closer to shore) and 2.7±0.6 nM dâ1 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 dâ1)/(mg mâ3) at station B and 0.7±0.2 (nM dâ1)/(mg mâ3) 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 dâ1)/(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 dâ1)/(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 dâ1)/(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.
⺠Estimated gross biological DMS production west of the Antarctic Peninsula. ⺠Average production was 3.1±0.6 nM dâ1 at station B and 2.7±0.6 nM dâ1 at station E. ⺠DMSPt-normalized production was similar in contrasting biogeochemical environments. ⺠Estimated average normalized production is 0.06±0.01 (nM DMS dâ1)/(nM DMSPt).
Journal: Continental Shelf Research - Volume 32, 1 January 2012, Pages 96-109