Temporal and spatial distribution of dimethylsulfide in the subarctic northeast Pacific Ocean: a high-nutrient–low-chlorophyll region

Article English OPEN
Wong, C. S. ; Wong, S. E. ; Richardson, W. A. ; Smith, G. E. ; Arychuk, M. D. ; Page, J. S. (2011)

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
  • References (40)
    40 references, page 1 of 4

    Andreae, M. O. 1986. The ocean as a source of atmospheric sulfur compounds. In: The Role of Air-Sea Exchange in Geochemical Cycling (ed. D. Buat-Me´nard) Reidel, Dordrecht, 331-362.

    Andreae, M. O. and Crutzen, P. J. 1997. Atmospheric aerosols: biogeochemical sources and role in atmospheric chemistry. Science 276, 1052-1058.

    Bates, T. S., Kiene, R. P., Wolfe, G. V., Matrai, P. A., Chavez, F. P. and co-authors 1994. The cycling of sulphur in surface seawater of the Northeast Pacific. J. Geophys. Res. 99, 7835-7843.

    Bond, N. A., Overland, J. E., Spillane, M. and Stabeno, P. 2003. Recent shifts in the state of the North Pacific. Geophys. Res. Lett. 30(23), 2183, doi:10.1029/2003 GL018597.

    Boyd, P., Law, C. S., Wong, C. S., Nojiri, Y., Tsuda, A. and co-authors 2004. The decline and fate of an iron-induced subarctic phytoplankton bloom. Nature 428, 549-553.

    Bratbak, G., Levasseur, M., Michaud, S., Cantin, G., Fernanadez, E. and co-authors 1995. Viral activity in relation to Emiliania huxleyi blooms: a mechanism of DMSP release? Mar. Ecol. Progr. Ser. 128, 133-142.

    Bucciarelli, E. and Sunda, G. W. 2003. Influence of CO2, nitrate, phosphate and silicate limitation on intracellular dimethylsulfoniopripionate in batch culture of the coastal diatom Thalassiosoa pseudonana. Limnol. Oceanogr. 48(6), 2256-2265.

    Burkill, P. H., Archer, S. D., Robinson, C., Nightingale, P. D., Groom, S. B. and co-authors 2002. Dimethyl sulphide biogeochemistry within a coccolithophores bloom (DISCO): an overview. Deep-Sea Res. II 40, 2863-2885.

    Cantin, G., Levasseir, M., Gosselin, M. and Michaud, S. 1996. Role of zooplankton in the mesoscale distribution of surface dimethylsulfide concentrations in the Gulf of St. Lawrence, Canada. Mar. Ecol. Progr. Ser. 141, 103-117.

    Charlson, R. J., Lovelock, J. E., Andreae, M. O. and Warren, S. G. 1987. Oceanic phytoplankton, atmospheric sulphur, cloud albedo and climate. Nature 326, 655-661.

  • Metrics
    No metrics available
Share - Bookmark