Non-linear response of summertime marine productivity to increased meltwater discharge around Greenland.

Hopwood, Mark J. , Carroll, D., Browning, T. J., Meire, L., Mortensen, J., Krisch, Stephan and Achterberg, Eric P. (2018) Non-linear response of summertime marine productivity to increased meltwater discharge around Greenland. Open Access Nature Communications, 9 (3256). DOI 10.1038/s41467-018-05488-8.

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Abstract

Runoff from the Greenland Ice Sheet (GrIS) is thought to enhance marine productivity by adding bioessential iron and silicic acid to coastal waters. However, experimental data suggest nitrate is the main summertime growth-limiting resource in regions affected by meltwater around Greenland. While meltwater contains low nitrate concentrations, subglacial discharge plumes from marine-terminating glaciers entrain large quantities of nitrate from deep seawater. Here, we characterize the nitrate fluxes that arise from entrainment of seawater within these plumes using a subglacial discharge plume model. The upwelled flux from 12 marine-terminating glaciers is estimated to be >1000% of the total nitrate flux from GrIS discharge. This plume upwelling effect is highly sensitive to the glacier grounding line depth. For a majority of Greenland’s marine-terminating glaciers nitrate fluxes will diminish as they retreat. This decline occurs even if discharge volume increases, resulting in a negative impact on nitrate availability and thus summertime marine productivity.

Document Type: Article
Keywords: Greenland Ice Sheet (GrIS), summertime marine productivity, meltwater discharge, Greenland
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1038/s41467-018-05488-8
ISSN: 2041-1723
Date Deposited: 27 Aug 2018 10:31
Last Modified: 24 May 2019 09:49
URI: http://oceanrep.geomar.de/id/eprint/44066

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