BISC 304W Final: Final Study-309.pdf
23 Feb 2014
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Document Summary
What is the physical basis for climate change? a. Some infrared radiation passes through the atmosphere but most is absorbed and re-mitted in all directions by greenhouse gas molecules and clouds i. ii. Effect: warm the earths surface and lower atmosphere. About half of the solar radiation is absorbed by earth"s surface and warms it. Radiative forcing: net irradiance at the atmospheric boundary between the troposphere and stratosphere. Net irradiance: is the difference between the incoming radiation energy and outgoing radiation energy in a given climate system, measured in watts per square meter. Greenhouses: co2 (deforestation, fossil fuels), methane( agriculture, natural gas), n2o (fertilizer), halocarbons(chloroflurocarbon gases for refrigerators) i. ii. i. Changing geographic distributions of fish populations and species. Range expansion of southern species, range contraction of n species, deepening of n sea fishes. Shifters are typically smaller and lower age maturity. Dangerous cc increase extremes as well as mean effects.
