摘要
用一个有限区域５层原始方程模式对由区域性大火（油田大火、森林大火）引起的地面总辐射异常减少对当地气候造成的影响进行了一系列的数值研究．试验结果表明，这类影响表现为在该区域及其邻近地区对流层大气整层降温，而地面附近降温最大．地面气压随着温度降低而升高，升高的幅度防高度增加而减小，在对流层中层以上变为降压．就象在该区域及其邻近地区对流层下部的大气中加了一个“距平冷高压”．这类“距平冷高压”夏季如出现在青藏高原测可能会削弱季风．这类影响有明显的季节变化和地区差异．另外，它除了使地面气温降低以外，在其它方面的影响要比气候的年际变化小得多（但夏季在青藏高原地区可能例外）．
In order to study climate response to anomalous decrease of toeal radiation at surface induced by regional disastrous fire such as oil field or forest fire, some numerical experiments have been performed by using a five-layer primitive equations model. The results of these experiments show that 1) the anomalous decrease of total radiation in the fire region not only causes atmospheric cooling (especially near surface) but also modifies the thermal structure and circulation of the atmosphere and the effect is like an“anomal cold high”being added in the atmospere over the fireregion and its neighbour region; 2) the effect would be diffrent with diffrent region or season; 3) in the Tibetan Plateau region the anomalous decrease of total radiation would weaken the monsoon; and 4) in general, the climate response to anomalous decrease of toeal radiation is less important in contrast with the effects of interannual change of climate, except for the decrease of the temperature near the surface.
出处
《热带气象学报》
CSCD
1996年第1期43-50,共8页
Journal of Tropical Meteorology
基金
国家自然科学基金
关键词
地面总辐射
气候响应
数值试验
Total radiation at surface Climate response Numerical experiment
