Lake Erie is commonly ice covered in winter. In late February 2007, Lake Erie had over 90% of its surface frozen with depths ranging from fractions of an inch in newly opened areas to over 10 feet thick in windrows where wind in open leads blows ice into piles on the ice shelf edge. However, as recently as 2002 there was no ice cover on the lake. Moreover, a four-year running average of percentage ice-cover on Lake Erie calculated by the United States Environmental Protection Agency shows a downward trend, possibly a harbinger of regional climate warming. What impact this could have on how the lake functions is not clear. Some suggest that ice protection prevents sediment suspension and keeps phosphorus, a key algal nutrient locked in sediments. Lower phosphorus levels will reduce the bloom of algae that happens every spring. Algal blooms are considered the prime culprit for the absence of oxygen deep in Lake Erie during the summer months due to the sinking of the algae and their decomposition that consumes oxygen.
Twiss is the director of the Great Rivers Center (www.clarkson.edu/cce/great_rivers.html ) at Clarkson University. The St. Lawrence River is the conduit through which the Great Lakes flow to the ocean. The explicit mission of the Great Rivers Center is to ensure that the quality of this freshwater resource is the highest possible. Water quality is defined by chemical purity, ecosystem health, and water ethics. To meet this task the GRC is a focal point for creative multidisciplinary research, scholarly
activity and community outreach.
PHOTO CAPTIONS: Twiss.jpg Clarkson professor Michael R. Twiss is contributing to research that will protect the Great Lakes.