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dc.contributor.authorLi, Xingwen  Concept link
dc.contributor.authorMcGillicuddy, Dennis J.  Concept link
dc.contributor.authorDurbin, Edward G.  Concept link
dc.contributor.authorWiebe, Peter H.  Concept link
dc.date.accessioned2007-02-07T16:15:57Z
dc.date.available2007-02-07T16:15:57Z
dc.date.issued2006-03-14
dc.identifier.urihttps://hdl.handle.net/1912/1482
dc.descriptionAuthor Posting. © Elsevier B.V., 2006. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Deep Sea Research Part II: Topical Studies in Oceanography 53 (2006): 2632-2655, doi:10.1016/j.dsr2.2006.08.011.en
dc.description.abstractAn adjoint data assimilation approach was used to quantify the physical and biological controls on Calanus finmarchicus N3 to C stages on Georges Bank and its nearby environs. The mean seasonal cycle of vertically-averaged distributions, from 5 years of the GLOBEC Georges Bank Broad-Scale Surveys between January and June, was assimilated into a physical-biological model based on the climatological circulation. Large seasonal and spatial variability is present in the inferred supply sources, mortality rates, computed molting fluxes, and physical transports. Estimated mortalities fall within the range of observed rates, and exhibit stage structure that is consistent with earlier findings. Inferred off-bank initial conditions indicate that the deep basins in the Gulf of Maine are source regions of early-stage nauplii and late-stage copepodids in January. However, the population increase on Georges Bank from January to April is controlled mostly by local biological processes. Magnitudes of the physical transport terms are nearly as large as the mortality and molting fluxes, but their bank-wide averages are small in comparison to the biological terms. The hypothesis of local biological control is tested in a sensitivity experiment in which upstream sources are set to zero. In that solution, the lack of upstream sources is compensated by a decrease in mortality that is much smaller than the uncertainty in observational estimates.en
dc.description.sponsorshipThis work was supported by the US GLOBEC Georges Bank program: Integration and Synthesis of Georges Bank Broad-Scale Survey Results, sponsored by NSF (OCE-0233800) and NOAA (NA17RJ1223).en
dc.format.extent2950222 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen
dc.relation.urihttps://doi.org/10.1016/j.dsr2.2006.08.011
dc.subjectCalanus finmarchicusen
dc.subjectPopulation dynamicsen
dc.subjectGeorges Banken
dc.subjectInverse modelingen
dc.subjectAdjoint methoden
dc.titleBiological control of the vernal population increase of Calanus finmarchicus on Georges Banken
dc.typePreprinten


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