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13 Cards in this Set
- Front
- Back
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the green house effect
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some of the infrared radiation passes through the atmosphere but most is absorbed and re-emmited in all directions by greenhouse gas molecules and clouds
the effect of this is to warm the earth's surface and the lower atmosphere |
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major GHGs
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CO2
CH4 N2O |
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albedo
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the reflectance of solar energy off earth's surface
dark colors=Low albedo light colors = high albedo |
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relationship between CO2 & temperature
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in past natural events triggered warming which released CO2 into atm and that CO2 caused more warming
today humans are increasing atm CO2 level, which is raising global temperatures |
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how we know relationship of CO2 and temperature
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GHGs have ability to trap heart within earth atm
Keeling atm CO2 measurements in Hawaii show CO2 has been increasing since 1958 |
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since industrial revolution CO2 level increase
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increased from 280 to 400ppm
levels higher then been in last 800,000 years |
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milankovitch cycles
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predictable long term cycles of earth's position relative to the sun
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current status of global warming
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land temperature increased by 0.96ºC in 2010 compared to 20th century average
2013 37th consecutive year annual temp was above long term average sea surface temperatures increased by as much as 5ºF in some places |
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current consequences of warming
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weather extremes - more water evaporating from Earth surfaces areas close to body of water wetter intercontinental drier
precipitation changes - some places recieve more some recieve less increase in Storms - as sea surface rises storm intensity rises |
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more consequences of warming
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shift in species ranges to higher altitudes and latitudes
earlier blooming or hatching times changes can uncouple important community connections invasive/disease-carrying insects are expanding their ranges |
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mitigation
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any action taken to eliminate or reduce the long term risks/hazards of climate change
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adaptation
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adjustment to changes caused by climate change
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how humans will be effected
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drought- lands could increase from 1-3% today to 30% by 2090
wildfires decreased crop production- if temps intracellular more than 3º celcius crop production to decrease 20-40% coastal erosion and flooding- 30-300 million people will be affected increase 2-4ºC increased incidence of infectious disease biodiversity loss- 3ºC increase predicted to endanger 20-50% of land species |
