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    Decadal analysis of hydrography and in situ nutrient budgets in the western and eastern North Atlantic subtropical gyre

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    2006JC003788.pdf (1.533Mb)
    Date
    2007-07-24
    Author
    Cianca, Andrés  Concept link
    Helmke, Peer  Concept link
    Mourino, Beatriz  Concept link
    Rueda, María José  Concept link
    Llinas, Octavio  Concept link
    Neuer, Susanne  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3525
    As published
    https://doi.org/10.1029/2006JC003788
    Related Material/Data
    https://hdl.handle.net/1912/3535
    DOI
    10.1029/2006JC003788
    Keyword
     Nutrient transport; Eddies; Altimetry 
    Abstract
    The current debate about the mechanisms and magnitude of new nutrient input to the euphotic zone in subtropical gyres calls for studies which consider large and mesoscale perspectives by combining in situ time series and remote observations. We carried out a first of its kind comparative analysis of hydrography and sea level anomaly (SLA) at the oligotrophic time series stations BATS (Bermuda Atlantic Time Series Study) and ESTOC (European Station for Time Series, Canary Islands) using concomitant 10-yr in situ and satellite altimetry data. The stations are located at about the same latitude in the western and eastern boundaries of the subtropical North Atlantic gyre, respectively, and provide the opportunity to study differences that may exist between both regions. Observed SLA was 0.25 m at BATS, compared with 0.12 m at ESTOC, a consequence of the higher eddy kinetic energy in the western compared with the eastern subtropical gyre. We quantified a detailed in situ nutrient budget for both time series stations; ESTOC received about 75% of the nutrients available for new production at BATS (in average 0.28 mol N m−2 yr−1 compared with 0.38 mol N m−2 yr−1, respectively), but the difference was not significant. However, significant differences in input mechanisms existed between both stations; eddy pumping constituted the main new nutrient source BATS, whereas wintertime convection was the main nutrient supply mechanism at ESTOC. In addition, the nutricline was significantly shallower at ESTOC compared with BATS, partly compensating for shallower mixed-layer depths and SLA variability at the western station. We found considerable interannual variability in both eddy pumping and wintertime convection which may be related to NAO-induced changes in the pattern of the subtropical gyre.
    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 Journal of Geophysical Research 112 (2007): C07025, doi:10.1029/2006JC003788.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Article: Cianca, Andrés, Helmke, Peer, Mourino, Beatriz, Rueda, María José, Llinas, Octavio, Neuer, Susanne, "Decadal analysis of hydrography and in situ nutrient budgets in the western and eastern North Atlantic subtropical gyre", Journal of Geophysical Research 112 (2007): C07025, DOI:10.1029/2006JC003788, https://hdl.handle.net/1912/3525
     

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