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      Summer meltwater and spring sea ice primary production, light climate and nutrients in an Arctic estuary, Kangedussuaq, west Greenland

      Lund-Hansen, Lars Chresten; Hawes, Ian; Nielsen, Morten Holtegaard; Dahllöf, Ingela; Sorrell, Brian K.
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      2018 hawes Arctic, Antarctic, and Alpine Research.pdf
      Published version, 1.543Mb
      DOI
       10.1080/15230430.2017.1414468
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      Lund-Hansen, L. C., Hawes, I., Nielsen, M. H., Dahllöf, I., & Sorrell, B. K. (2018). Summer meltwater and spring sea ice primary production, light climate and nutrients in an Arctic estuary, Kangedussuaq, west Greenland. Arctic, Antarctic, and Alpine Research, 50(1). https://doi.org/10.1080/15230430.2017.1414468
      Permanent Research Commons link: https://hdl.handle.net/10289/12065
      Abstract
      The estuary is dominated by sea ice and snow cover from winter to spring, and a highly turbid meltwater plume during summer. The aims were to quantify the variability in optical conditions, inorganic nutrients, and primary production between these two extremes, and identify the drivers of variability. Data were obtained during a summer cruise along a transect in the estuary in August 2007, and a spring campaign on the ice in March 2011. The study comprises conductivity, temperature, and depth (CTD), K𝒹(PAR), K𝒹(λ), PAR transmittance, photic depth, chl-a, nutrients (NO₃, NO₂, NH₃, PO₄, and SiO₂), primary production, and sediment concentrations. PAR transmittance varied between 5% below snow and ice and 85% in clear water with 44% in turbid meltwater. Primary production rates were similar below the ice in March (76.8 mg C m⁻² d⁻¹) and in the highly turbid meltwater in August (94.8 mg C m⁻² d⁻¹), but higher (246.6 mg C m⁻² d⁻¹) at the mouth of the fjord. Meltwater inflow was the main driver of variability during summer and the snow and sea ice during spring. Under-ice primary production will increase three-fold with less snow on the sea ice, and the higher meltwater turbidity with increased melting of glacial ice and runoff will only reduce primary production slightly.
      Date
      2018
      Type
      Journal Article
      Publisher
      Taylor & Francis
      Rights
      © 2018 The authors. Published with license by Taylor & Francis. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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      • Science and Engineering Papers [3122]
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