Glacier change in the American West. The Mazama legacy of f glacier measurements
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2 Glacier change in the American West 1946 The Mazama legacy of f glacier measurements
3 The relevance of Glaciers Hazards: Debris Flows Outburst Floods Vatnajokull, 1996 White River Glacier, Mt. Hood
4 The relevance of Glaciers Climatic Indicator: past and present Landscape Modification Information in the ice
5 The relevance of Glaciers Water Flow: Frozen Reservoirs Alpine Streams Global Sea Level Rise Robert Stallard Digital Vision
6 Global Changes in Air Temperature and Sea Level From the IPCC SPM-3, 2007
7 Causes of Global Sea Level Rise Antarctica Greenland Dotted line uncertainty in estimates Grey - observed Sea level rise mm yr Glaciers and ice caps Thermal Expansion observed Blue contribution Of melting ice Red - thermal expansion of ocean water due to atmospheric warming From the IPCC SPM report 2007
8 USGS Surveys of the West USGS explorations make the first scientific observations of glaciers King Survey, Watkins photographer
9 CLARENCE KING Mount Shasta, CA September 11, 1871 discovered the first glacier in the western states C.E. Watkins, 1871 Hague discovered glaciers on Mt. Hood Arnold Hague
10 Glaciers in the American West 1 : 24, glaciers km 2 (266 miles 2 ) US Forest Service lands National Park Service lands Glaciers
11 Examples of glacier change over the past 100 years Eliot Glacier, Mount Hood, OR Provided by Darryl Lloyd
12 Benson Glacier Wallowas, OR 1920 (H. Richardson) 1992 (D. Jensen) (courtesy USDA)
13 Grinnell Glacier Lewis Range, Montana Glacier National Park T.J. Hileman D. Fagre
14 1907 Darwin Glacier Sierra Nevada Kings Canyon Nat. Park August 14, 1907 G.K.Gilbert 2003 August 2, 2003 Hassan Basagic
15 Andrews Glacier Colorado Front Range Rocky Mountain National Park
16 South Cascade Glacier, WA 1960 USGS 2004 John Scurlock
17 Current (2007) USGS topographic map and its depiction of South Cascade Glacier
18 Current (2007) aerial photograph of South Cascade Glacier. The map on the previous image is really about 40 years out of date andhas not kept up with climate change.
19 South Cascade Glacier Cummulative Mass Change (m weq) US Geological Survey
20 How glaciers work Winter Snow Summer melt Mass Change + -
21 Trends in Winter Snowpack since 1950 (Mote et al., 2005) Red thinning April 1 snow packs Blue thickening April 1 snowpacks. Consequently, we expect glaciers to retreat except in the high Sierra.
22 Total Glacier Area Changes % % 0.8 Area (km 2 ) Fractional Area 60% % % 0.2 Oregon Cascades Sierra Nevada Lewis Range ` %
23 Glacier Area Change Elevation (m) % 10% 20% 30% 40% 50% 60% 70% 80% 90% Sierra Glacier Nat Pk Mt Hood Mt Rainier Olympics Local effects: Glaciers in the Northwest (Rainier) with high elevations are receding more slowly than others. Effect of increased snow above the local freezing level. Sierra have different local effects. Area Change Decrease
24 Article from a California newspaper in SEP 2004 Basagic IC Russell 1883 R.H. Anderson 1940 geologists believe that within 50 years these ancient ice masses may disappear completely. Have to be careful with predictions. The glaciers in the Sierra are very small and have retreated into protective Niches (cirques) which contribute extra snow via avalanches and reduces
25 Fraction of Glacier Area Lost since % 24% 66% 30% 40% 60% The 60% loss in the Sierra despite local snow gains in the region indicates that Other processes are at work.
26 Global Glacier Change Kaser et al., 2006
27 Global Sea Level Rise Antarctica Greenland Sea level rise mm yr Glaciers and ice caps Thermal Expansion observed Now about the contribution to global sea level from Greenland IPCC SPM report 2007
28 Melting on the Greenland Ice Sheet 2005 The red/orange indicates the extent of melting on the Greenland Ice Sheet. Arctic Impacts of Arctic Warming, Cambridge Press, 2004 Koni Steffen, University of Colorado
29 A new response: INCREASED ICE FLOW TO THE OCEAN From Alley, EGU 2006 Howat et al., 2005, GRL, Helheim Glacier, Greenland
30 Melting Melting & Ice Flow Its not just melting and water flow to the oceans, now it includes rapid ice flow to the oceans.
31 SEA LEVEL RISE
32 How do we know the cause is humans and not natural causes? Through computer models, which are becoming increasingly accurate. IPCC
33 Web page on the glaciers we study.
34 Appearances Time/ABC/Stanford poll: About 85% of Americans say global warming is happening right But 65% think scientists disagree about global warming wrong The community of climate research scientists are in broad agreement that humans are warming the planet.
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