The authors attribute the unusual circulation and thermocline patterns to anticyclonic winds that tend to blow over Lake Erie. Such anticyclonic winds would cause the warm surface waters to converge in the center of the lake, driving down the depth of the thermocline. They suggest that the depressed thermocline squashes the cool region near the lake bed, where many species hide from the summer heat. The depressed thermocline could also be responsible for amplifying deep-water summer hypoxia, reducing the oxygen available to lake-bottom plants and animals.
Source: Geophysical Research Letters, doi:10.1029/2012GL051002, 2012 http://dx.doi.org/10.1029/2012GL051002
Title: Summer thermal structure and anticyclonic circulation of Lake Erie
Authors: Dmitry Beletsky and Raisa Beletsky: CILER, School of Natural Resources and Environment, University of Michigan, Ann Arbor, Michigan, USA;
Nathan Hawley, Henry A. Vanderploeg, David J. Schwab, and Steven A. Ruberg: Great Lakes Environmental Research Laboratory, NOAA, Ann Arbor, Michigan, USA;
Yerubandi R. Rao: National Water Research Institute, Environment Canada, Burlington, Ontario, Canada.
6. Fossilized plant matter points to desertification near Tibetan Plateau
Roughly 22 million years ago, at the onset of the Miocene, the Tibetan Plateau
started to lift upward. The rising land curbed the flow
|Contact: Mary Catherine Adams|
American Geophysical Union