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    Particle export from the upper ocean over the continental shelf of the west Antarctic Peninsula: A long-term record, 1992–2007

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    New Trap Ms March 08 revision clean.pdf (751.4Kb)
    Date
    2008-03
    Author
    Ducklow, Hugh W.  Concept link
    Erickson, Matthew  Concept link
    Kelly, Joann  Concept link
    Montes-Hugo, Martin  Concept link
    Ribic, Christine A.  Concept link
    Smith, Raymond C.  Concept link
    Stammerjohn, Sharon E.  Concept link
    Karl, David M.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/2565
    As published
    https://doi.org/10.1016/j.dsr2.2008.04.028
    Abstract
    We report on results of a long-term (1993-2007) time series sediment trap moored at 170 m to the west of the Antarctic Peninsula in the mid-continental shelf region (350 m depth; 64º30’ S, 66º00’ W). This is a region characterized by late spring-summer diatom blooms, moderately high seasonal primary productivity (50-150 mmol C m-2 d-1 in December-February) and high phytoplankton and krill biomass in the seasonal sea ice zone. The mass flux ranged from near 0 to over 1 g m-2 d-1 and was near 0 to >30% organic carbon (mean 8%). Sedimentation from the upper ocean as estimated by the trap collections at 170 m exhibited strong seasonality with high fluxes (1-10 mmol C m-2 d-1) in November-March following ice retreat and very low fluxes (<0.001 mmol C m-2 d-1) during the Austral winter and under sea ice cover. An average of 85% of the annual export of 212 mmol C m-2 occurred during the seasonal peak flux episodes. Over the trap record, the annual peak flux episode has tended to occur later in the Austral summer, advancing by about 40 days since 1993. The time-integrated sedimentation during the peak flux episode was <1 – 50% of the SeaWiFS-estimated primary production (mean 4%) at the trap site over the period 1998-2006. The elemental composition of material captured in the traps had an average C:N:P of 212:28:1, greater than the canonical Redfield values. High C:P ratios (400- 600) corresponded with the annual flux peak, indicating preferential loss of P from the sinking particles in the summer, ice-free period. The composition of the exported material more closely approximated the Redfield composition during the low-flux, winter period.
    Description
    Author Posting. © The Author(s), 2008. 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 55 (2008): 2118-2131, doi:10.1016/j.dsr2.2008.04.028.
     
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    Suggested Citation
    Preprint: Ducklow, Hugh W., Erickson, Matthew, Kelly, Joann, Montes-Hugo, Martin, Ribic, Christine A., Smith, Raymond C., Stammerjohn, Sharon E., Karl, David M., "Particle export from the upper ocean over the continental shelf of the west Antarctic Peninsula: A long-term record, 1992–2007", 2008-03, https://doi.org/10.1016/j.dsr2.2008.04.028, https://hdl.handle.net/1912/2565
     
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