Articles | Volume 15, issue 4
https://doi.org/10.5194/tc-15-2083-2021
https://doi.org/10.5194/tc-15-2083-2021
Research article
 | 
27 Apr 2021
Research article |  | 27 Apr 2021

Early spring subglacial discharge plumes fuel under-ice primary production at a Svalbard tidewater glacier

Tobias Reiner Vonnahme, Emma Persson, Ulrike Dietrich, Eva Hejdukova, Christine Dybwad, Josef Elster, Melissa Chierici, and Rolf Gradinger

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Latest update: 12 Sep 2025
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Short summary
We describe the impact of subglacial discharge in early spring on a sea-ice-covered fjord on Svalbard by comparing a site influenced by a shallow tidewater glacier with two reference sites. We found a moderate under-ice phytoplankton bloom at the glacier front, which we attribute to subglacial upwelling of nutrients; a strongly stratified surface layer; and higher light penetration. In contrast, sea ice algae biomass was limited by low salinities and brine volumes.
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