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Tracer-derived freshwater composition of the Siberian continental shelf and slope following the extreme Arctic summer of 2007

Abrahamsen, E. Povl; Meredith, Michael P.; Falkner, Kelly Kenison; Torres-Valdes, Sinhue; Leng, Melanie J.; Alkire, Matthew B.; Bacon, Sheldon; Laxon, Seymour W.; Polyakov, Igor; Ivanov, Vladimir. 2009 Tracer-derived freshwater composition of the Siberian continental shelf and slope following the extreme Arctic summer of 2007. Geophysical Research Letters, 36 (7), L07602. 5, pp. 10.1029/2009GL037341

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Abstract/Summary

We investigate the freshwater composition of the shelf and slope of the Arctic Ocean north of the New Siberian Islands using geochemical tracer data (δ18O, Ba, and PO4*) collected following the extreme summer of 2007. We find that the anomalous wind patterns that partly explained the sea ice minimum at this time also led to significant quantities of Pacific‐derived surface water in the westernmost part of the Makarov Basin. We also find larger quantities of meteoric water near Lomonosov Ridge than were found in 1995. Dissolved barium is depleted in the upper layers in one region of our study area, probably as a result of biological activity in open waters. Increasingly ice‐free conditions compromise the quantitative use of barium as a tracer of river water in the Arctic Ocean.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2009GL037341
Programmes: BGS Programmes 2008 > NERC Isotope Geoscience Laboratory
BAS Programmes > Other Special Projects
NOC Programmes
ISSN: 0094-8276
NORA Subject Terms: Marine Sciences
Earth Sciences
Date made live: 02 Apr 2009 13:25
URI: http://nora.nerc.ac.uk/id/eprint/6378

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