A Great Lakes Primer. Great Lakes Basin Great Lakes Profile.

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Presentation transcript:

A Great Lakes Primer

Great Lakes Basin

Great Lakes Profile

LakeDepth (m)Surface Area (km 2 ) Volume (km 3 ) Retention Time (yr) Population (millions) Basin Area Lake Area Ratio Superior14782,10012, Michigan8557,8004, Huron5959,6003, Erie1925, Ontario8618,9601, Morphometry and Development

Phosphorus and Eutrophication

Trophic State Index

Toxic Substances

Invasive Species 183 non-indigenous species in the Great Lakes (NOAA)

Areas of Concern Areas of Concern (AOCs): severely degraded sites with impaired beneficial use Remedial Action Plans (RAPs): specify problems and methods of correcting them Lakewide Management Plans (LaMPs): plan to assess, restore, and protect ecosystem health GLWQA

Areas of Concern Waukegan Harbor (IL) PCBs Outboard Marine Corporation Rouge River (MI) Urban storm water discharges, CSOs, nonpoint source pollution, and municipal and industrial discharges Presque Isle Bay (PA) PAHs, heavy metals

From the Literature – Lake Superior Toxaphene was a popular replacement for DDT until being banned in Here, atmospheric sampling and back-trajectory analysis are applied to quantify rates of deposition and sources for Lake Superior.

From the Literature – Lake Michigan Beach closing due to fecal contamination are closely associated with public perception of water quality

From the Literature – Lake Huron Numbers on x-axis refer to depth zones: 1 = shallow, 2 = intermediate, 3 = deep

From the Literature – Lake Erie Black area is region of anoxia. Number at bottom is depletion rate.

From the Literature – Lake Ontario Mirex is an organic chemical used as a fire retardant and insecticide (fire ants). It has a long half-life. It was found to be present in fish in northern Lake Ontario, but no source was identified.

A Great Lakes Primer