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Frontiers in Marine Science
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Pan-Arctic Ocean Primary Production Constrained by Turbulent Nitrate Fluxes

Authors: Achim Randelhoff; Achim Randelhoff; Johnna Holding; Johnna Holding; Markus Janout; Mikael Kristian Sejr; Mikael Kristian Sejr; +5 Authors

Pan-Arctic Ocean Primary Production Constrained by Turbulent Nitrate Fluxes

Abstract

Arctic Ocean primary productivity is limited by light and inorganic nutrients. With sea ice cover declining in recent decades, nitrate limitation has been speculated to become more prominent. Although much has been learned about nitrate supply from general patterns of ocean circulation and water column stability, a quantitative analysis requires dedicated turbulence measurements that have only started to accumulate in the last dozen years. Here we present new observations of the turbulent vertical nitrate flux in the Laptev Sea, Baffin Bay, and Young Sound (North-East Greenland), supplementing a compilation of 13 published estimates throughout the Arctic Ocean. Combining all flux estimates with a Pan-Arctic database of in situ measurements of nitrate concentration and density, we found the annual nitrate inventory to be largely determined by the strength of stratification and by bathymetry. Nitrate fluxes explained the observed regional patterns and magnitudes of both new primary production and particle export on annual scales. We argue that with few regional exceptions, vertical turbulent nitrate fluxes can be a reliable proxy of Arctic primary production accessible through autonomous and large-scale measurements. They may also provide a framework to assess nutrient limitation scenarios based on clear energetic and mass budget constraints resulting from turbulent mixing and freshwater flows.

Countries
Germany, France
Subjects by Vocabulary

Library of Congress Subject Headings: lcsh:QH1-199.5 lcsh:General. Including nature conservation, geographical distribution lcsh:Science lcsh:Q

Microsoft Academic Graph classification: Stratification (water) Climate change Atmospheric sciences chemistry.chemical_compound Water column Nitrate Sea ice Bathymetry geography geography.geographical_feature_category Ocean current chemistry Arctic Environmental science

Keywords

Science, Ocean Engineering, QH1-199.5, Aquatic Science, Oceanography, Arctic, nitrate, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography, Water Science and Technology, Global and Planetary Change, Q, turbulence, General. Including nature conservation, geographical distribution, sea ice, flux, climate change, primary production

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    Top 1%
    influence
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    impulse
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    Top 1%
  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    78
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 1%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Top 10%
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 1%
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
78
Top 1%
Top 10%
Top 1%
gold