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Wong, C. S.; Wong, S. E.; Richardson, W. A.; Smith, G. E.; Arychuk, M. D.; Page, J. S. (2011)
Publisher: Tellus B
Journal: Tellus B
Languages: English
Types: Article
Dimethylsulfide (DMS) was measured in the upper 400 m of the northeast Pacific from February 1996 to June 2001. The sampling took place along Line P (48°34.5′N, 125°30′W to 50°N, 145°W). DMS concentrations increased diurnally from a pre-dawn low to a mid-day maximum and from coastal waters to open ocean, in a high-nutrient–low-chlorophyll-a (HNLC) water mass. The mean surface DMS in winter was 2 nM, in spring 6 nM and in summer 10 nM. Our June surface DMS amounts were comparable with those obtained by the Pacific Marine Environmental Laboratory. A sea to air flux of DMS at Station P (50°N, 145°W) was high in the summer of 1997 and the early autumn of 1998 and 2000 and was significantly higher than at other Line P stations. The average flux along Line P was 27 μmol m−2 d−1 by Wanninkhof's formula while that by Liss and Merlivat was 16 μmol m−2 d−1. DMS profiles showed a decreasing trend with depth, as did temperature and chlorophyll-a (Chl-a), but an increasing trend with salinity and nitrate. Average DMS concentrations at mixed-layer depth (DMSMLD) were low in winter at an average of 2.4 nM, moderate in spring at 8 nM and high in summer at 16 nM. For open ocean stations P20 and P26 DMSMLD was high, while Chl-aMLD was low for late spring and early summer during 1996–1998. That is the “summer paradox” phenomenon. The ratio of DMSMLD to Chl-aMLD was out of phase with the mixed-layer depth. Our data confirm the high DMS concentrations previously reported for this region and suggest that this is characteristic of the subarctic HNLC region.DOI: 10.1111/j.1600-0889.2005.00156.x
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