期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 11, 页码 3951-3958出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL060199
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资金
- USGS
- NCCWSC
- Coastal Marine Geology Program Alaska Climate Science Center
- NASA Roses Program
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.
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