摘要
对塞罕坝地区多年气温和降水的大尺度环流异常进行合成分析,研究其环流特征及关键因子.结果表明:1962-2020年塞罕坝地区气温总体呈偏高趋势,春、秋、冬季降水呈偏多趋势,夏季降水呈偏少趋势.大尺度环流背景下,各季节影响塞罕坝地区气温和降水的主要因子不同,通过挑选最优因子分析得出:塞罕坝地区受大气环流指数影响明显,春季太平洋—北美遥相关型指数(PNA)、夏季北大西洋涛动指数(NAO)、秋季西太平洋遥相关型指数(WP)、冬季高原季风指数(PMI)与该地气温和降水有较好的关系.
Abstract
This study analyzed the circulation characteristics and key factors of the Saihanba area through a comprehensive analysis of the long-term abnormal temperature and precipitation patterns.The results indicated that the temperature in the Saihanba area exhibited an increasing trend from 1962 to 2020,with higher values observed in spring,autumn,and winter,and lower values in summer.Similarly,precipitation levels were higher in spring,autumn,and winter,but lower in summer.In each season,the temperature and precipitation in the Saihanba area were influenced by different factors within the context of large-scale circulation.By identifying the most influential factors,we can draw meaningful conclusions.The Saihanba area is strongly influenced by the atmospheric circulation index.Additionally,its temperature and precipitation exhibit significant correlations with the Pacific North American Pattern(PNA)in spring,the North Atlantic Oscillation(NAO)in summer,the West Pacific Pattern(WP)in autumn,and the Plateau Monsoon Index(PMI)in winter.
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