anthropogenic climate change. global temperature is increasing
Post on 02-Jan-2016
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Anthropogenic Climate Change
Global Temperature is Increasing
How We Know This
• Measured data• Natural indicators• Observation• Ice• Weather• Wildlife
Natural Forcing
Source: IPCC (Intergovernmental Panel on Climate Change)
- “Radiative forcing is a measure of the influence a factor has in altering the balance of incoming and outgoing energy in the Earth-atmosphere system and is an index of the importance of the factor as a potential climate change mechanism. In this report radiative forcing values are for changes relative to preindustrial conditions defined at 1750 and are expressed in Watts per square meter (W/m2)” -IPCC
Source: “High-resolution carbon dioxide concentration record 650,000–800,000 years before present”
-Compilation of CO2 records and EPICA (European Project for Ice Coring in Antarctica) Dome C temperature anomaly over the past 800 thousand years- Changes in past atmospheric carbon dioxide concentrations were determined by measuring the composition of air trapped in ice cores from Antarctica-atmospheric carbon dioxide is strongly correlated with Antarctic temperature throughout eight glacial cycles
Source: United States Global Change Research Program (2009)
Anthropogenic Forcing
• s
Source: NOAA (National Oceanic and Atmospheric Administration)
Greenhouse Gases
• CO2, N2O, CH4, H2O, CFCs, O3
• Energy absorption– Larger gases vibrate when struck– Think about ozone
• CO2 absorbs infrared emitted from Earth’s surface• Bouncing around of energy keeps surface warm• Net positive forcing of 1.6 W/m2
• Varying atmospheric lifespan
Source: http://centerforoceansolutions.org/climate/impacts/cumulative-impacts/storm-intensity/
Source: Greenpeace
Source: U.S. Environmental Protection Agency
Source: U.S. Environmental Protection Agency
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