Export production and its regulating factors in the West Antarctica Peninsula region of the Southern Ocean


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dc.contributor.author Huang, Kuan
dc.contributor.author Ducklow, Hugh W.
dc.contributor.author Vernet, Maria
dc.contributor.author Cassar, Nicolas
dc.contributor.author Bender, Michael L.
dc.date.accessioned 2012-05-22T13:23:45Z
dc.date.available 2012-10-24T08:40:24Z
dc.date.issued 2012-04-24
dc.identifier.citation Global Biogeochemical Cycles 26 (2012): GB2005 en_US
dc.identifier.uri http://hdl.handle.net/1912/5192
dc.description Author Posting. © American Geophysical Union, 2012. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 26 (2012): GB2005, doi:10.1029/2010GB004028. en_US
dc.description.abstract In connection with the Palmer LTER program, mixed layer water samples were collected during the cruise of the L.M. Gould in Jan., 2008 at 49 stations on a 20 × 100 km grid in the West Antarctica Peninsula (WAP) region of the Southern Ocean. In this study, [O2]/[Ar] ratios and the triple isotope composition of dissolved O2 were measured, and were used to estimate net community O2 production (NCP) and gross primary O2 production (GPP), respectively. These estimates are further converted to carbon export production, primary production and the f-ratio. Our measurements give NCP ranging from −3 to 76 mmol O2 m−2 day−1 (−25 to 650 mg C m−2 day−1), and GPP from 40 to 220 mmol O2 m−2 day−1 (180 to 1010 mg C m−2 day−1). The O2 NCP/GPP ratios range from −0.04 to 0.43, corresponding to f-ratios of −0.08 to 0.83. NCP and the NCP/GPP ratio are highest in the northern coastal areas, and decrease to lower values toward the southern coastal area and the open ocean. The inshore-offshore gradient appears to be regulated primarily by iron availability, as supported by the positive correlation between NCP and Fv/Fm ratios (r2 = 0.22, p < 0.05). Mixed layer depth (MLD) is inversely correlated with NCP (r2 = 0.21, p < 0.002) and NCP/GPP (r2 = 0.21, p < 0.02), and highest NCP occurred in the fresh water lenses probably formed from melted coastal glaciers. These results suggest that export production and the f-ratio increase where water stratification is intensified by input of fresh meltwater, and that mixed layer stratification is the major factor regulating NCP in the inner-shelf and coastal regions. Along-shelf variability of phytoplankton community composition is highly correlated with NCP, i.e., NCP increases when the diatom-dominated community in the south transitions to the cryptophyte-dominated one in the north. A high correlation is also observed between NCP and the logarithm of the surface chlorophyll concentration (r2 = 0.72, p < 0.0001) , which makes it possible to estimate carbon export as a function of Chl a concentration in this region. en_US
dc.description.sponsorship This research was supported by NSF-OPP grant 0823101 to Ducklow and NASA Earth and Space Sciences Fellowship to Huang. en_US
dc.format.mimetype application/pdf
dc.format.mimetype image/tiff
dc.format.mimetype text/plain
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri http://dx.doi.org/10.1029/2010GB004028
dc.subject Southern Ocean en_US
dc.subject Chlorophyll en_US
dc.subject Gross primary production en_US
dc.subject Net community production en_US
dc.subject Oxygen isotopes en_US
dc.subject Phytoplankton en_US
dc.title Export production and its regulating factors in the West Antarctica Peninsula region of the Southern Ocean en_US
dc.type Article en_US
dc.description.embargo 2012-10-24 en_US
dc.identifier.doi 10.1029/2010GB004028

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