Ice sheets as a significant source of highly reactive nanoparticulate iron to the oceans.

Abstract:

:The Greenland and Antarctic Ice Sheets cover ~ 10% of global land surface, but are rarely considered as active components of the global iron cycle. The ocean waters around both ice sheets harbour highly productive coastal ecosystems, many of which are iron limited. Measurements of iron concentrations in subglacial runoff from a large Greenland Ice Sheet catchment reveal the potential for globally significant export of labile iron fractions to the near-coastal euphotic zone. We estimate that the flux of bioavailable iron associated with glacial runoff is 0.40-2.54 Tg per year in Greenland and 0.06-0.17 Tg per year in Antarctica. Iron fluxes are dominated by a highly reactive and potentially bioavailable nanoparticulate suspended sediment fraction, similar to that identified in Antarctic icebergs. Estimates of labile iron fluxes in meltwater are comparable with aeolian dust fluxes to the oceans surrounding Greenland and Antarctica, and are similarly expected to increase in a warming climate with enhanced melting.

journal_name

Nat Commun

journal_title

Nature communications

authors

Hawkings JR,Wadham JL,Tranter M,Raiswell R,Benning LG,Statham PJ,Tedstone A,Nienow P,Lee K,Telling J

doi

10.1038/ncomms4929

subject

Has Abstract

pub_date

2014-05-21 00:00:00

pages

3929

issn

2041-1723

pii

ncomms4929

journal_volume

5

pub_type

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