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Climate Change Impacts in the United States

Climate Change Impacts in the United States. Biogeochemical Cycles. Third National Climate Assessment. [Name] [Date]. Biogeochemical Cycles http:// nca2014.globalchange.gov/report/sectors/biogeochemical-cycles. Convening Lead Authors James N. Galloway, University of Virginia

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Climate Change Impacts in the United States

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  1. Climate Change Impacts in the United States Biogeochemical Cycles Third National Climate Assessment [Name] [Date]

  2. Biogeochemical Cycleshttp://nca2014.globalchange.gov/report/sectors/biogeochemical-cycles • Convening Lead Authors • James N. Galloway, University of Virginia • William H. Schlesinger, Cary Institute of Ecosystem Studies • Lead Authors • Christopher M. Clark, U.S. Environmental Protection Agency • Nancy B. Grimm, Arizona State University • Robert B. Jackson, Duke University • Beverly E. Law, Oregon State University • Peter E. Thornton, Oak Ridge National Laboratory • Alan R. Townsend, University of Colorado Boulder • Contributing Authors • Rebecca Martin, Washington State University Vancouver

  3. Human-Induced Changes Human activities have increased atmospheric carbon dioxide by about 40% over pre-industrial levels and more than doubled the amount of nitrogen available to ecosystems. Similar trends have been observed for phosphorus and other elements, and these changes have major consequences for biogeochemical cycles and climate change.

  4. Major North American Carbon Dioxide Sources and Sinks Figure source: King et al. 20121

  5. Human Activities that Form Reactive Nitrogen and Resulting Consequences in Environmental Reservoirs Figure source: adapted from EPA 2011;1 Galloway et al. 2003;2 with input from USDA. USDA contributors were Adam Chambers and Margaret Walsh

  6. Sinks and Cycles In total, land in the United States absorbs and stores an amount of carbon equivalent to about 17% of annual U.S. fossil fuel emissions. U.S. forests and associated wood products account for most of this land sink. The effect of this carbon storage is to partially offset warming from emissions of CO2 and other greenhouse gases.

  7. Nitrogen Emissions Figure source: adapted from Pinder et al. 20121

  8. Impacts and Options Altered biogeochemical cycles together with climate change increase the vulnerability of biodiversity, food security, human health, and water quality to changing climate. However, natural and managed shifts in major biogeochemical cycles can help limit rates of climate change.

  9. Many Factors Combine to Affect Biogeochemical Cycles James Galloway, University of Virginia

  10. U.S. Carbon Sinks Absorb a Fraction of CO2Emissions Data from EPA 20123 and CCSP 20074

  11. U.S. Carbon Sources and Sinks from 1991 to 2000 and 2001 to 2010 Data from EPA 20121 and CCSP 20072

  12. Climate Change Impacts in the United Stateshttp://nca2014.globalchange.gov #NCA2014 Third National Climate Assessment @usgcrp facebook.com/usgcrp [Name & Contact Info]

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