Climate & b2 A) J. U& E
Today I w ant to talk about the earth last major climatic shift at the end of ice age first let us back up the moment and review what we know about climatic change in general first we de fine climate as consistent patterns of weather over significant periods of time in general changes in climate occur when energy balance of earth is disturbed solar energy enter the earth’s atmosphere as light and is radiate by the earth surface as heat land water and ice each affected the energy exchangdifferently The system is so complex that to date our best computer are only crude approximations and are sophisticated not enough to test hypotheses the causes of climatic change
4 N! a( _! }/ u0 C Of couse that does’t keep us from speculating for instance volcanic activity is one mechanism that might affect climatic change when large volcano erupt they disperse tons of particles into the upper atmosphere where particles then reflect light * y; ]1 p, f# z# ~, y4 |
Since less light is entering the system of energy exchange the result would be a cooling of the earth’s surface of coure this is probably just one mechanism of ! `1 _! R) x0 ?9 g& Z4 C
global climatic change In all probability a complete explanation would involve several different mechanisms operating at the same time
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