Lecture6_Water budget_biomes

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Unformatted text preview: ace mining – Sewage discharge Water Problem Water Problem ► http://video.nytimes.com/video/2009/02/02/multimedia/1 (Aral Seas disappearing Video) ► http://video.nytimes.com/video/2009/02/02/multimedia/1 (Google earth and oceans) ► http://www.msnbc.msn.com/id/36167170/?GT1=43001 (Aral sea disappearing article) ► http://www.msnbc.msn.com/id/39312458/from/toolbar (growing lake in North Dakota) Water Problem Water Problem Lake Mead Marina on July 29, 2007 in the Lake Mead National Recreation Area, Nevada. A seven­year drought and increased water demand spurred by explosive population growth in the Southwest has caused the water level at Lake Mead, which supplies water to Las Vegas, Arizona and Southern California, to drop over 100 feet to its lowest level Australia: Water Budget Australia: Water Budget ► "The recent 12­year, 8­ month period is the driest in the 110­years­long record.” ► But there is no serious disputing that southern Australia must prepare for a much hotter and drier future; the government forecasts that rainfall will decline 22 to 71 percent by 2100. http://www.washingtonpost.com/wp­ dyn/content/article/2009/12/08/AR2009120804490_2.ht ml?sid=ST2009120804530 Water Cycle Water Cycle Water Budget around the World Water Budget around the World Water Budget around the World Water Budget around the World Water Budget around the World Water Budget around the World Future Flooding in Md Future Flooding in Md http://www.washingtonpost.com/wp­dyn/content/graphic/2009/01/25/GR2009012500603.html?sid=ST2009012500606&s_pos=list Goddard Role in Understanding the Global Water Budget Water Cycle Components Present Observational Capabilities and Future plans The Potential for a Global Observational System 02 February 2005 Goddard Space Flight Center 41 Observing the Global Water Cycle Importance to Human Health ► Water cycle variability: resolve a few percent per year Measurements stable over decades All components measured • Must evaluate: – Human uses of water – Impacts on availability 02 February 2005 Goddard Space Flight Center 42 Observing the Global Water Cycle Importance to Human Health ► Human health: Education concerning health Environmental pollution Availability of clean water • As NASA goal: – As long term vision for NASA Earth science – Supports weather & climate needs 02 February 2005 Goddard Space Flight Center 43 The Global Water Cycle ► Global water budget: ~ 2.5% of global water is fresh water Of the fresh water, ► ► ► ► ► ~ 69% is permanent ice / snow ~ 30% is ground water the balance is available in soil, lakes, rivers, etc. ~ 1% of the fresh water fuels life on Earth Large variability in fresh water availability due to: latitude and topography weather and climate human influences ► How will the availability of fresh water change as climate changes? 02 February 2005 Goddard Space Flight Center 44 The Global Water Cycle • Global fresh water budget: – – – –...
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