Nutrient and Silicon Isotope Dynamics in the Laptev Sea and Implications for Nutrient Availability in the Transpolar Drift

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MARC

Laukert, G.Dalhousie University,GEOMAR Helmholtz Centre for Ocean Research Kiel,Woods Hole Oceanographic Institution (author)

Nutrient and Silicon Isotope Dynamics in the Laptev Sea and Implications for Nutrient Availability in the Transpolar Drift

Article/chapterEnglish2022

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2022

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LIBRIS-ID:oai:lup.lub.lu.se:22199837-848c-4390-9373-71506fa8af4b
https://lup.lub.lu.se/record/22199837-848c-4390-9373-71506fa8af4bURI
https://doi.org/10.1029/2022GB007316DOI

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Language:English
Summary in:English

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Subject category:ref swepub-contenttype

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Realistic prediction of the near-future response of Arctic Ocean primary productivity to ongoing warming and sea ice loss requires a mechanistic understanding of the processes controlling nutrient bioavailability. To evaluate continental nutrient inputs, biological utilization, and the influence of mixing and winter processes in the Laptev Sea, the major source region of the Transpolar Drift (TPD), we compare observed with preformed concentrations of dissolved inorganic nitrogen (DIN) and phosphorus (DIP), silicic acid (DSi), and silicon isotope compositions of DSi (δ30SiDSi) obtained for two summers (2013 and 2014) and one winter (2012). In summer, preformed nutrient concentrations persisted in the surface layer of the southeastern Laptev Sea, while diatom-dominated utilization caused intense northward drawdown and a pronounced shift in δ30SiDSi from +0.91 to +3.82‰. The modeled Si isotope fractionation suggests that DSi in the northern Laptev Sea originated from the Lena River and was supplied during the spring freshet, while riverine DSi in the southeastern Laptev Sea was continuously supplied during the summer. Primary productivity fueled by river-borne nutrients was enhanced by admixture of DIN- and DIP-rich Atlantic-sourced waters to the surface, either by convective mixing during the previous winter or by occasional storm-induced stratification breakdowns in late summer. Substantial enrichments of DSi (+240%) and DIP (+90%) beneath the Lena River plume were caused by sea ice-driven redistribution and remineralization. Predicted weaker stratification on the outer Laptev Shelf will enhance DSi utilization and removal through greater vertical DIN supply, which will limit DSi export and reduce diatom-dominated primary productivity in the TPD.

Subject headings and genre

NATURVETENSKAP Geovetenskap och miljövetenskap Klimatforskning hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Climate Research hsv//eng
NATURVETENSKAP Geovetenskap och miljövetenskap Geokemi hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Geochemistry hsv//eng
Arctic Ocean
diatoms
Laptev Sea
nutrients
silicon isotopes
transpolar drift

Added entries (persons, corporate bodies, meetings, titles ...)

Grasse, P.GEOMAR Helmholtz Centre for Ocean Research Kiel,German Centre for Integrative Biodiversity Research (iDiv) (author)
Novikhin, A.Arctic and Antarctic Research Institute (author)
Povazhnyi, V.Arctic and Antarctic Research Institute (author)
Doering, K.Lund University,Lunds universitet,Kvartärgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Quaternary Sciences,Department of Geology,Faculty of Science,GEOMAR Helmholtz Centre for Ocean Research Kiel(Swepub:lu)kr3260do (author)
Hölemann, J.Alfred-Wegener Institute, Helmholtz Center for Polar and Marine Research, Bremerhaven (author)
Janout, M.Alfred-Wegener Institute, Helmholtz Center for Polar and Marine Research, Bremerhaven (author)
Bauch, D.GEOMAR Helmholtz Centre for Ocean Research Kiel (author)
Kassens, H.GEOMAR Helmholtz Centre for Ocean Research Kiel (author)
Frank, M.GEOMAR Helmholtz Centre for Ocean Research Kiel (author)
Dalhousie UniversityGEOMAR Helmholtz Centre for Ocean Research Kiel (creator_code:org_t)

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In:Global Biogeochemical Cycles36:90886-6236

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By the author/editor: Laukert, G.; Grasse, P.; Novikhin, A.; Povazhnyi, V.; Doering, K.; Hölemann, J.; show more...; Janout, M.; Bauch, D.; Kassens, H.; Frank, M.; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Climate Research

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Geochemistry

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By the university: Lund University

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