High export of dissolved silica from the Greenland Ice Sheet.

Meire, L., Meire, P., Struyf, E., Krawczyk, D. W., Arendt, K. E., Yde, J. C., Juul Pedersen, T., Hopwood, Mark J. , Rysgaard, S. and Meysman, F. J. R. (2016) High export of dissolved silica from the Greenland Ice Sheet. Open Access Geophysical Research Letters, 43 (17). pp. 9173-9182. DOI 10.1002/2016GL070191.

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Abstract

Silica is an essential element for marine life and plays a key role in the biogeochemistry of the ocean. Glacial activity stimulates rock weathering, generating dissolved silica that is exported to coastal areas along with meltwater. The magnitude of the dissolved silica export from large glacial areas such as the Greenland Ice Sheet is presently poorly quantified and not accounted for in global budgets. Here we present data from two fjord systems adjacent to the Greenland Ice Sheet which reveal a large export of dissolved silica by glacial meltwater relative to other macronutrients. Upscaled to the entire Greenland Ice Sheet, the export of dissolved silica equals 22 ± 10 Gmol Si yr−1. When the silicate-rich meltwater mixes with upwelled deep water, either inside or outside Greenland's fjords, primary production takes place at increased silicate to nitrate ratios. This likely stimulates the growth of diatoms relative to other phytoplankton groups.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/FP7/306933
Additional Information: WOS:000385357200043
Keywords: silica cycle; Greenland Ice Sheet; biogeochemistry; weathering
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/2016GL070191
ISSN: 0094-8276
Projects: ERC
Date Deposited: 30 Sep 2016 06:04
Last Modified: 01 Feb 2019 15:01
URI: http://oceanrep.geomar.de/id/eprint/34069

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