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The influence of Arctic Fe and Atlantic fixed N on summertime primary production in Fram Strait, North Greenland Sea.

https://arctichealth.org/en/permalink/ahliterature304715
Source
Sci Rep. 2020 09 17; 10(1):15230
Publication Type
Journal Article
Research Support, Non-U.S. Gov't
Date
09-17-2020
Author
Stephan Krisch
Thomas J Browning
Martin Graeve
Kai-Uwe Ludwichowski
Pablo Lodeiro
Mark J Hopwood
Stéphane Roig
Jaw-Chuen Yong
Torsten Kanzow
Eric P Achterberg
Author Affiliation
Marine Biogeochemistry Division, GEOMAR Helmholtz Centre for Ocean Research, 24148, Kiel, Germany.
Source
Sci Rep. 2020 09 17; 10(1):15230
Date
09-17-2020
Language
English
Publication Type
Journal Article
Research Support, Non-U.S. Gov't
Abstract
Climate change has led to a?~?40% reduction in summer Arctic sea-ice cover extent since the 1970s. Resultant increases in light availability may enhance phytoplankton production. Direct evidence for factors currently constraining summertime phytoplankton growth in the Arctic region is however lacking. GEOTRACES cruise GN05 conducted a Fram Strait transect from Svalbard to the NE Greenland Shelf in summer 2016, sampling for bioessential trace metals (Fe, Co, Zn, Mn) and macronutrients (N, Si, P) at?~?79°N. Five bioassay experiments were conducted to establish phytoplankton responses to additions of Fe, N, Fe?+?N and volcanic dust. Ambient nutrient concentrations suggested N and Fe were deficient in surface seawater relative to typical phytoplankton requirements. A west-to-east trend in the relative deficiency of N and Fe was apparent, with N becoming more deficient towards Greenland and Fe more deficient towards Svalbard. This aligned with phytoplankton responses in bioassay experiments, which showed greatest chlorophyll-a increases in?+?N treatment near Greenland and?+?N?+?Fe near Svalbard. Collectively these results suggest primary N limitation of phytoplankton growth throughout the study region, with conditions potentially approaching secondary Fe limitation in the eastern Fram Strait. We suggest that the supply of Atlantic-derived N and Arctic-derived Fe exerts a strong control on summertime nutrient stoichiometry and resultant limitation patterns across the Fram Strait region.
PubMed ID
32943713 View in PubMed
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