摘要
对发生于新生代的６次巨大天体撞击作用（６５Ｍａ，３４Ｍａ，１５Ｍａ，２．４Ｍａ，１．１Ｍａ，０．７Ｍａ）的气候效应进行的模拟表明，这６次巨大天体撞击作用产生的尘埃进入平流层后，可使全球平均温度下降至零度以下，降温效应持续时间最长可达３０年之久。首次在模拟中考虑全球性森林大火产生的ＣＯ２和死亡生物分解生成的ＣＯ２的温室效应，研究表明这两种作用使大气中ＣＯ２增量最大仅达６７％，其增温效应远远低于尘埃层产生的降温作用．但考虑全球碳循环，这两种作用对大气中ＣＯ２影响可达１００年左右．
The paleoclimate effects of six asteroid impact events on the Earth happened in Cenozoic are studied by employing a energy-balance model. The result shows that when the dusts produced by these impacts entered the stratosphere, the average temperature of the Earth decrease to below 0℃, the disturbances caused by the impacts on temperature are last for about 30 years in maximum. It is first time that greenhouse effect of the carbon diozide produced by global fire and decomposition the died animals and plants is considered in modeling. However, at maximum, carbon dioxide produced by these two effects (global fire and decomposition of the died animals and plains) only makes an increase of 67% the atmospheric carbon dioxide, the greenhouse effect is so small that it can be negleted while compared with the effect of the antigreenhouse effect of the dusts. When the global carbon cycle is considered,these two effects on atmospheric carbon dioxide are last for 100 years.
出处
《空间科学学报》
CAS
CSCD
北大核心
1996年第2期109-114,共6页
Chinese Journal of Space Science
基金
国家自然科学基金
