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AGU journal highlights - 6 January 2004

tle: Evidence for enhanced mercury reactivity in response to estuarine mixing
Authors: Kristofer R. Rolfhus, University of Wisconsin-La Crosse, La Crosse, Wisconsin; Carl H. Lamborg, William F. Fitzgerald, Prentiss H. Balcom, University of Connecticut, Groton, Connecticut.
Source: Journal of Geophysical Research-Oceans (JC) paper 10.1029/2001JC001297, 2003
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10. Effects of sea ice keels on polar surface waters
The keels of sea ice contribute to the heat flux of Arctic waterways by enhancing the underwater mixing of warmer and cooler waters. Skyllingstad et al. simulated the effects from varying ice keel depths on the upper ocean during summer and winter, when the changes in ice thickness affect the polar oceans' flow patterns and ice coverage. The authors note that shallow ice keels (one meter [three feet] or less) seen during summer generate a turbulent wake below the ice sheets that extend hundreds of meters [yards] downstream and help mix warmer fresh meltwater with cooler saltwater. They then analyzed the strong differences estimated to occur between the summertime ice keels and the deeper wintertime keels, which can reach up to 10 meters [30 feet] below the surface, and propose that the shallower keels generate stronger mixing closer to the ice and increased ice melting rates. Conversely, the deeper keels follow a similar pattern but mix the water further from the surface and force ice bottom melting during the winter when new ice is usually forming.

Title: Effects of keels on ice bottom turbulence exchange
Authors: Eric D. Skyllingstad, Clayton A. Paulson, W. Scott Pegau, Oregon State University, Corvallis, Oregon; Miles G. McPhee, McPhee Research Company, Naches, Washington; Timothy Stanton, Naval Postgraduate School, Monterey, California.
Source: Journal of Geophysical Research-Oceans (JC) pap
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Contact: Harvey Leifert
hleifert@agu.org
202-777-7507
American Geophysical Union
6-Jan-2004


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