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Lake Superior summer water temperatures are increasing more rapidly than regional air temperatures: A positive ice-albedo feedback

TitleLake Superior summer water temperatures are increasing more rapidly than regional air temperatures: A positive ice-albedo feedback
Publication TypeManual Entry
Year of Publication2007
AuthorsAustin, Jay A., and Steven M. Colman
GEOPHYSICAL RESEARCH LETTERS
Volume34
Date PublishedMAR 23
PublisherAMER GEOPHYSICAL UNION
Place Published2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
Type of ArticleArticle
ISSN0094-8276
Abstract

Lake Superior summer ( July - September) surface water temperatures have increased approximately 2.5 degrees C over the interval 1979 - 2006, equivalent to a rate of ( 11 +/- 6) x 10(-2) degrees C yr(-1), significantly in excess of regional atmospheric warming. This discrepancy is caused by declining winter ice cover, which is causing the onset of the positively stratified season to occur earlier at a rate of roughly a half day per year. An earlier start of the stratified season significantly increases the period over which the lake warms during the summer months, leading to a stronger trend in mean summer temperatures than would be expected from changes in summer air temperature alone.

DOI10.1029/2006GL029021
Citation Key683
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Lake Ice