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Global Climate Change

Global Climate Change. Sara Parr Sigrid Smith Kellogg Biological Station. What is Global Climate Change?. Changes in global temperature Changes in patterns of precipitation and extreme weather events ( increased risk of droughts and floods)

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Global Climate Change

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  1. Global Climate Change Sara Parr Sigrid Smith Kellogg Biological Station

  2. What is Global Climate Change? • Changes in global temperature • Changes in patterns of precipitation and extreme weather events (increased risk of droughts and floods) • additional sea-level rise that will gradually inundate coastal areas • threats to biodiversity • potential challenges for public health.

  3. Source: http://www.sustainablescale.org/images/uploaded/GREENHOUSE%20EFFECT.JPG

  4. What does that mean for us? • Continuation of historical trends of greenhouse gas emissions will result in additional warming over the 21st century, with current projections of a global increase of 2.5ºF to 10.4ºF by 2100, with warming in the U.S. expected to be even higher.

  5. What Causes Global Climate Change? • Increases in greenhouse gas concentrations, particularly water vapor, CO2, CH4, N2O, CFCs, and HCFCs • Decreases in the cover of ice sheets changes the albedo of the earth • Land use changes and changes in the water cycle may also influence global climate change.

  6. http://www.mlo.noaa.gov/HISTORY/PUBLISH/20th%20anniv/Geophy/GAS/Co2/figure%203%20(40).gifhttp://www.mlo.noaa.gov/HISTORY/PUBLISH/20th%20anniv/Geophy/GAS/Co2/figure%203%20(40).gif

  7. Lake ice data • Another longterm data record collected for several lakes • Predictions: If global temperatures are increasing, we might see… • Later ice formation in winter (“ice-on”) • Earlier ice thawing in spring (“ice-off”) • Shorter ice duration (number of days lake is frozen during winter)

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