摘要
根据北半球云场资料的研究，作者提出对环流季节变化的一种新认识：北半球大气环流的季节变化是由上下边界加热场与波状低云之间的一个负反馈过程和一个正反馈过程所制约的。负反馈过程发生于夏半年：夏季高纬地区强烈回暖→高纬波状低云形成→波状低云冷却大气（5～9月）→为冬季极涡南扩准备了条件。正反馈过程发生于冬半年:高纬地区强烈降温→高纬波状低云消失,中纬波状低云生成→冷却中纬大气（从10月到次年5月）→为夏季西风槽北缩准备条件。在这两种反馈过程中，低纬洋面作为一个常年稳定的热源,与中、高纬多变的热汇构成斜压不稳定区。并强烈影响冬夏的气候变化。
Based on clouds data in Northern Hemisphere,the author discovered that seasonal variation of Atmospheric Circulation are controlled by two feedback processes. One is a positive feedback occurred in winter:severe cooling atmosphere in high latitude areas→Lower Undulatus Clonds(LUC) disappearing in high Latitude but LUC forming in some mid-latitude areas→cooling mid-latitude atmosphere by LUC from October to May→forming Westerly trough in Summer.Another is a negative feedback process in summer:Severe heating atmosphere in high latitude areas→LUC forming in high Latitude→cooling atmosphere in high latitude areas form May to September→forming polar vortex in winter. During all the two feedback processes, as a stable heating source in lower latitude ocean, with cooling source caused by LUC it caused baroclinic zones and affected climate variability of winter and summer.
出处
《黑龙江八一农垦大学学报》
1999年第4期6-11,共6页
journal of heilongjiang bayi agricultural university
关键词
大气环流
季节变化
波状低云
冷却作用
北半球
seasonal variation of atmosphere circulation
Lower Undulatuse Clouds
cooling effect
