Estuarine removal of glacial iron and implications for iron fluxes to the ocean

Geophysical Research Letters
By: , and 

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Abstract

While recent work demonstrates that glacial meltwater provides a substantial and relatively labile flux of the micronutrient iron to oceans, the role of high-latitude estuary environments as a potential sink of glacial iron is unknown. Here we present the first quantitative description of iron removal in a meltwater-dominated estuary. We find that 85% of “dissolved” Fe is removed in the low-salinity region of the estuary along with 41% of “total dissolvable” iron associated with glacial flour. We couple these findings with hydrologic and geochemical data from Gulf of Alaska (GoA) glacierized catchments to calculate meltwater-derived fluxes of size and species partitioned Fe to the GoA. Iron flux data indicate that labile iron in the glacial flour and associated Fe minerals dominate the meltwater contribution to the Fe budget of the GoA. As such, GoA nutrient cycles and related ecosystems could be strongly influenced by continued ice loss in its watershed.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Estuarine removal of glacial iron and implications for iron fluxes to the ocean
Series title Geophysical Research Letters
DOI 10.1002/2014GL060199
Volume 41
Issue 11
Year Published 2014
Language English
Publisher American Geophysical Union
Contributing office(s) Alaska Science Center Geology Minerals
Description 8 p.
First page 3951
Last page 3958