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Interannual variability of primary production and dissolved organic nitrogen storage in the North Pacific Subtropical Gyre

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dc.contributor.author Luo, Ya-Wei
dc.contributor.author Ducklow, Hugh W.
dc.contributor.author Friedrichs, Marjorie A. M.
dc.contributor.author Church, Matthew J.
dc.contributor.author Karl, David M.
dc.contributor.author Doney, Scott C.
dc.date.accessioned 2012-09-21T14:28:35Z
dc.date.available 2013-03-10T08:45:36Z
dc.date.issued 2012-08-10
dc.identifier.citation Journal of Geophysical Research 117 (2012): G03019 en_US
dc.identifier.uri http://hdl.handle.net/1912/5377
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 Journal of Geophysical Research 117 (2012): G03019, doi:10.1029/2011JG001830. en_US
dc.description.abstract The upper ocean primary production measurements from the Hawaii Ocean Time series (HOT) at Station ALOHA in the North Pacific Subtropical Gyre showed substantial variability over the last two decades. The annual average primary production varied within a limited range over 1991–1998, significantly increased in 1999–2000 and then gradually decreased afterwards. This variability was investigated using a one-dimensional ecosystem model. The long-term HOT observations were used to constrain the model by prescribing physical forcings and lower boundary conditions and optimizing the model parameters against data using data assimilation. The model reproduced the general interannual pattern in the observed primary production, and mesoscale variability in vertical velocity was identified as a major contributing factor to the interannual variability in the simulation. Several strong upwelling events occurred in 1999, which brought up nitrate at rates several times higher than other years and elevated the model primary production. Our model results suggested a hypothesis for the observed interannual variability pattern of primary production at Station ALOHA: Part of the upwelled nitrate input in 1999 was converted to and accumulated as semilabile dissolved organic nitrogen (DON), and subsequent recycling of this semilabile DON supported enhanced primary productivity for the next several years as the semilabile DON perturbation was gradually removed via export. en_US
dc.description.sponsorship This work was supported in part by the Center for Microbial Oceanography, Research and Education (C-MORE) (NSF EF-0424599), Hawaii Ocean Time series program (NSF OCE09–26766), the Gordon and Betty Moore Foundation, and the Marine Biological Laboratory. en_US
dc.format.mimetype text/plain
dc.format.mimetype application/msword
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/10.1029/2011JG001830
dc.subject Mesoscale activity en_US
dc.subject North Pacific Subtropical Gyre en_US
dc.subject Dissolved organic nitrogen en_US
dc.subject Interannual variability en_US
dc.subject Primary production en_US
dc.title Interannual variability of primary production and dissolved organic nitrogen storage in the North Pacific Subtropical Gyre en_US
dc.type Article en_US
dc.description.embargo 2013-03-10 en_US
dc.identifier.doi 10.1029/2011JG001830


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