Influence of ocean freshening on shelf phytoplankton dynamics


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dc.contributor.author Ji, Rubao
dc.contributor.author Davis, Cabell S.
dc.contributor.author Chen, Changsheng
dc.contributor.author Townsend, David W.
dc.contributor.author Mountain, David G.
dc.contributor.author Beardsley, Robert C.
dc.date.accessioned 2010-04-28T19:25:29Z
dc.date.available 2010-04-28T19:25:29Z
dc.date.issued 2007-12-28
dc.identifier.citation Geophysical Research Letters 34 (2007): L24607 en_US
dc.identifier.uri http://hdl.handle.net/1912/3352
dc.description Author Posting. © American Geophysical Union, 2007. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 34 (2007): L24607, doi:10.1029/2007GL032010. en_US
dc.description.abstract Climate change-induced freshening of the ocean can enhance vertical stratification and alter circulation patterns in ways that influence phytoplankton dynamics. We examined the timing of spring phytoplankton blooms and the magnitude of net primary productivity in the Nova Scotian Shelf (NSS) - Gulf of Maine (GoM) region with respect to seasonal and interannual changes in surface water freshening from 1998 to 2006. The general pattern of temporal westward progression of the phytoplankton bloom corresponds with the gradient of increasing sea surface salinity from the NSS in the east to the western GoM. Increased freshening enhances the spatial gradients in bloom timing by stimulating earlier blooms upstream (NSS), but it has less impact downstream (the western GoM). Strong spatial gradients (increasing westward) of mean chlorophyll concentration and net primary productivity during post-bloom months (May–June) indicate that lower sea surface salinity upstream can likely impede nutrient fluxes from deep water and therefore affect overall productivity. en_US
dc.description.sponsorship We thank NSF grant OCE-0727033 and NOAA grant NA17RJ1223 to RJ, CSD and RCB, NSF grants OCE- 0606612 and OCE-0726577 to DWT, and NSF grants OCE-0606928 and OCE-0726851 to CC. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri http://dx.doi.org/10.1029/2007GL032010
dc.subject Ocean freshening en_US
dc.subject Phytoplankton bloom en_US
dc.subject Primary productivity en_US
dc.title Influence of ocean freshening on shelf phytoplankton dynamics en_US
dc.type Article en_US
dc.identifier.doi 10.1029/2007GL032010

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