Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 43, Issue 17, Pages 9173-9182Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL070191
Keywords
silica cycle; Greenland Ice Sheet; biogeochemistry; weathering
Categories
Funding
- Research Foundation Flanders (FWO aspirant grant)
- Canada Excellence Research Chair program
- European Research Council under the European Union [306933]
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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 2210GmolSiyr(-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.
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