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- Dec. 1999: Measuring waves... with waves.
- Nov. 1999: Eddies: two sides to the story.
- Oct. 1999: Mediterranean tides are more than meets the eye.
- Sep. 1999: Mare nostrum, Mare incognita ?.
- Aug. 1999: Great Lakes as seen by Topex/Poseidon.
- Jul. 1999: Aral Sea could be rising from the dust.
- Jun. 1999: An eddy blown by the wind.
- May 1999: A turbulent sea.
- Apr. 1999: Jason-1 put to the test.
- Mar 1999: Observing the ocean to improve forecasting.
- Feb. 1999: Route du Rhum 1998.
- Jan. 1999: A glassy sea... of ridges and valleys.
- 1998.
- Operational News.
Great Lakes as seen by Topex/Poseidon
Image of the Month - August 1999
- Lake Ontario water level change since September 1992. Seasonal variations show typical level minima in January and level maxima in June-July. The 1999 minima was 20-30 cm lower than previous years.
The Topex/Poseidon Altimetry satellite has been optimized to measure the level of the oceans. However, inland seas and lakes are also easily observable, offering an expanse of water for the instrument to view and monitor.
The Great Lakes, situated in the North-East of the United States, are among the largest fresh water lakes on Earth. Flown over by Topex/Poseidon, we have been able to monitor surface water levels and their seasonal variations since 1992. At the end of 1998, some of the lakes (e.g. Lake Ontario) experienced lower than normal minimum levels possibly due to the El Niño/La Niña phenomenon.
See also:
- Lakes and enclosed seas monitoring
- El Niño - Southern Oscillation
Websites on this subject:
- Great Lakes and El Niño on Noaa website : Recent Lake Levels and Precipitation in Historical Perspective