FN Archimer Export Format
PT J
TI Glacial influence on the geochemistry of riverine iron fluxes to the Gulf of Alaska and effects of deglaciation
BT 
AF SCHROTH, Andrew W.
   CRUSIUS, John
   CHEVER, Fanny
   BOSTICK, Benjamin C.
   ROUXEL, Olivier
AS 1:1;2:2,3;3:4;4:5;5:4,6,7;
FF 1:;2:;3:;4:;5:PDG-REM-GM-LGM;
C1 Woods Hole Coastal and Marine Science Center, U.S. Geological Survey, Woods Hole, Massachusetts, USA
   Woods Hole Coastal and Marine Science Center, U.S. Geological Survey, Woods Hole, Massachusetts, USA
   University of Washington, Coastal and Marine Geology Program, U.S. Geological Survey, School of Oceanography, Seattle, Washington, USA
   European Institute for Marine Studies, University of Brest, Technopôle Brest-Iroise, Plouzané, France
   Lamont-Doherty Earth Observatory, Palisades, New York, USA
   Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA
   IFREMER, Centre de Brest, Plouzané, France
C2 WOODS HOLE, USA
   WOODS HOLE, USA
   UNIVERSITY OF WASHINGTON, USA
   UBO, FRANCE
   LDEO, USA
   WOODS HOLE, USA
   IFREMER, FRANCE
SI BREST
SE PDG-REM-GM-LGM
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
IF 3.792
TC 38
UR https://archimer.ifremer.fr/doc/00044/15483/12872.pdf
LA English
DT Article
AB Riverine iron (Fe) derived from glacial weathering is a critical micronutrient source to ecosystems of the Gulf of Alaska (GoA). Here we demonstrate that the source and chemical nature of riverine Fe input to the GoA could change dramatically due to the widespread watershed deglaciation that is underway. We examine Fe size partitioning, speciation, and isotopic composition in tributaries of the Copper River which exemplify a long-term GoA watershed evolution from one strongly influenced by glacial weathering to a boreal-forested watershed. Iron fluxes from glacierized tributaries bear high suspended sediment and colloidal Fe loads of mixed valence silicate species, with low concentrations of dissolved Fe and dissolved organic carbon (DOC). Iron isotopic composition is indicative of mechanical weathering as the Fe source. Conversely, Fe fluxes from boreal-forested systems have higher dissolved Fe concentrations corresponding to higher DOC concentrations. Iron colloids and suspended sediment consist of Fe (hydr)oxides and organic complexes. These watersheds have an iron isotopic composition indicative of an internal chemical processing source. We predict that as the GoA watershed evolves due to deglaciation, so will the source, flux, and chemical nature of riverine Fe loads, which could have significant ramifications for Alaskan marine and freshwater ecosystems. Citation: Schroth, A. W., J. Crusius, F. Chever, B. C. Bostick, and O. J. Rouxel (2011), Glacial influence on the geochemistry of riverine iron fluxes to the Gulf of Alaska and effects of deglaciation, Geophys. Res. Lett., 38, L16605, doi:10.1029/2011GL048367.
PY 2011
PD AUG
SO Geophysical Research Letters
SN 0094-8276
PU Amer Geophysical Union
VL 38
IS L16605
UT 000294368100002
DI 10.1029/2011GL048367
ID 15483
ER

EF