As executive director of the Great Lakes Observing System, she's leading a campaign to map every meter of the lakes' bottom.

In the Great Lakes, water temperatures are roughly the same temperature from the surface to the bottom of the lake in spring and fall. During winter and summer, the water temperature from the ...

DOOR COUNTY (WLUK) -- The health of Great Lakes water quality will be in focus ... but if you give live-stream video from the bottom of the lake, it's priceless," said Mark Holey, Retired Fish ...

and 2013-14 (bottom) plainly show the relationship between colder or warmer winters and the subsequent ice cover. Image credit: NOAA/ESRL (left) and NOAA/GLERL (right). The Great Lakes ice season ...