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RELATIONSHIP BETWEEN WINTERTIME THERMAL CONTRAST OVER THE ASIAN CONTINENT AND THE CLIMATE IN CHINA 总被引：2，自引：1，他引：1
Recent studies indicated that except for the land-sea thermal contrast,there also existed the land-land thermal contrast.The composite analysis and t-test method are used to further study the local thermal contrast variation over the Asian continent,and to discuss the association of seasonal variation of land thermal state with circulation over East Asia,the early summer and summer monsoon activity,and the precipitation anomaly in China in the decadal scale.Results show that the positive meridional temperature anomaly transports downward from upper tropospheric layers in middle-high latitudes north of 25°N in the positive years.In the zonal direction,the Tibetan Plateau heating in the successive spring acts as a force to influence the atmosphere,leading to the rapid temperature warming over eastern Chinese continent,which could increase the land-sea thermal contrast with the negative SSTA.Accordingly,the monsoon activity in early summer over East Asian establishes earlier and the summer monsoon intensity becomes stronger.The early summer precipitation is more-than-normal over the Yangtze River,and the summer precipitation is more-than-normal over the north China and the southwest China.The situation is contrary in the negative years. 相似文献
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研究了1948～2004年东亚增暖背景下对流层顶高度的演变特征，重点分析对流层温度、平流层中下部温度与对流层顶高度变化之间的关系。结果表明：东亚地区对流层顶高度在1970年代后呈现波动上升趋势，其上升趋势不如南半球显著；东亚对流层温度与对流层顶高度呈显著正相关，特别是对流层中上部温度与对流层顶高度的正相关最显著，这说明对流层中上部的增温对对流层顶高度的抬升贡献较大；东亚平流层中下层温度与对流层顶高度基本呈显著负相关，70hPa层上的负相关最显著；近20年来东亚对流层温度上升了约0．2℃，平流层中下部温度下降了约1．2℃，对流顶高度上升了约86m，对流层的增暖和平流层的冷却作用共同导致了东亚对流层顶高度的变化。 相似文献
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2017年6月24日和2019年9月30日云南省昭通市盐津县出现了两次严重的地质灾害,造成重大人员伤亡和财产损失。本文利用NCEP再分析资料、地面自动站观测资料及多普勒天气雷达探测资料,对比分析了两次灾害的天气诱因。结果表明:“6.24”滑坡灾害发生在夏季主汛期,是由冷暖空气长时间交汇造成的持续性降水天气导致,期间伴有几次区域性强降水过程,雷达回波以大范围层积混合云回波特征为主,对流性暴雨特征不明显。“9.30”泥石流灾害发生在大气环流突变的秋季,冷暖空气势力较弱,天气尺度系统造成的区域降水强度不大,而由局地热力作用造成的单点对流性强降水才是灾害发生的主要诱因。 相似文献
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