envs 100 lecture 18

envs 100 lecture 18 - 11/21/2010 The Icy Edge of Climate...

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11/21/2010 1 Jeffrey Bury Department of Environmental Studies University of California, Santa Cruz The Icy Edge of Climate Change Glacier Recession and Environmental Governance in the Andes Glaciers are Receding Very Rapidly
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11/21/2010 2 •0.10˚C/decade •overall +0.68°C since 1939 •last 20 years: only 2 (1996 and 1999) below the long term (1961-90) average Vuille et al. 2008, Ear Sci Rev Observed Andean temperature change
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11/21/2010 3 Cordillera Blanca 71% in Peru 22% in Bolivia 4% in Ecuador 3% in Colombia ~1% Venezuela
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11/21/2010 4 Glaciers on 3 Peaks in Sierra Merida Pico Bolivar, Humboldt, Bonpland Lost more than 95% of glacier-covered area since mid-1800’s (10 glaciers mapped in 1952-5 Left) Sierra Nevada de Santa Marta-50% Loss, past 20 yrs. Sierra Nevada de Cocuy Nevados de Tolima and del Ruiz 30-45% Loss, past 20 yrs
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11/21/2010 5 Cotopaxi 1976-1997-Loss of 30% of surface area Quelccaya Ice Cap (Qori Kalis Glacier) 1963-1978-Baseline (Thompson-Ohio State) 1983-1991-3 Times Faster 1991-2005-10 Times Faster
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11/21/2010 6 The Peruvian Andes are home to 70% of all tropical glaciers Since 1970, ~25% of glaciers have melted ~15 million people
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envs 100 lecture 18 - 11/21/2010 The Icy Edge of Climate...

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