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| 1 | 中国南海夏季风强、弱年多尺度相互作用能量学特征显示文摘中国南海夏季风为东亚季风的主要系统之一,其具有多重尺度特征,除季节平均环流场外,低频(季节内振荡)和高频(天气尺度)扰动也十分活跃,各尺度系统存在明显的年际变化。该研究使用ERA-Interim和NCEP/NCAR两套再分析资料,从季风平均动能(MKE)诊断的角度出发,探讨了1979—2010年中国南海夏季风环流年际变化的能量来源及其和扰动场的相互作用过程。结果表明:中国南海夏季风对流活跃年份,中国南海南部(12°N以南)及中南半岛一带为季风平均动能显著增强区,此与南亚季风区西风急流的增强并向东延伸有关;中国南海北部(12°N以北)及西太平洋为气旋性环流盘踞,季风槽加深。中国南海南部季风平均动能增强的能量源自于扰动动量通量与平均环流的相互作用,强季风年,平均环流失去较少的动能给扰动场(亦即平均环流保留较多的动能)。通过进一步探讨高频(<10d)及低频(10—90d)扰动场与平均环流不同分量的(散度、涡度、风垂直切变)相互作用过程,发现季风平均动能的增长主要来自于<10d扰动与季风平均散度和涡度的相互作用。中国南海北部季风槽区季风平均动能的维持来自于大气热源和平均上升运动的相互作用,但同时有较多的季风平均动能向扰动动能转换,有利于扰动的成长。因此,强季风年,中国南海北部热带气旋生成数目增多,夏季北传的季节内振荡也增强,导致中国南部沿海及华南地区出现较多的灾害天气。 | 杨悦 徐邦琪 何金海 | 2016 | 气象学报2016，74，4： | 2 |
| 2 | Summer Monsoon Indices on June Rainfall in Hong Kong and Its Vicinity显示文摘Climatologically, June is usually the wettest month in Hong Kong. With significant interannual variation of the summer monsoon, the rainfall variability in June is also large. As Hong Kong is in close proximity to the peripheries of different monsoon regions, the variability of June rainfall largely depends on the relative strength of various monsoon systems. In the present study, a new index comparing the relative condition of the western North Pacific summer monsoon and the South China Sea summer monsoon is developed based on the difference between the respective monsoon indices WNPMI(western North Pacific summer monsoon index) and UMI(unified monsoon index). It is shown that June rainfall in Hong Kong and its vicinity is better correlated with this new index than either WNPMI or UMI alone. Based on the signs of the new index in conjunction with those of WNPMI and UMI, a framework to stratify the monsoon conditions into different configurations together with a simple scheme to summarize the associated rainfall responses is formulated. This study highlights how the rainfall variability on a local or regional scale can be quantified by the broad-scale conditions of different monsoon systems. | 胡文志 唐恒伟 李子祥 | 2016 | Journal of Meteorological Research2016，30，5： | 0 |
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