Lake Superior summer water temperatures are increasing more rapidly than regional air temperatures: A positive ice-albedo feedback
Article first published online: 23 MAR 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 6, March 2007
How to Cite
2007), Lake Superior summer water temperatures are increasing more rapidly than regional air temperatures: A positive ice-albedo feedback, Geophys. Res. Lett., 34, L06604, doi:10.1029/2006GL029021., and (
- Issue published online: 23 MAR 2007
- Article first published online: 23 MAR 2007
- Manuscript Accepted: 7 FEB 2007
- Manuscript Revised: 31 JAN 2007
- Manuscript Received: 7 DEC 2006
- Lake Superior;
- climate change;
 Lake Superior summer (July–September) surface water temperatures have increased approximately 2.5°C over the interval 1979–2006, equivalent to a rate of (11 ± 6) × 10−2°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.