Detecting the Origins of Moisture over Southeast China: Seasonal Variation and Heavy Rainfall
Detecting the Origins of Moisture over Southeast China: Seasonal Variation and Heavy Rainfall
复制标题
探寻中国东南部湿气的来源：季节变化和强降雨
DOI：
10.1007/s00376-015-4197-5
复制
发表时间：
2016
影响因子：
5.8
通讯作者：
Chen Yongqin David
中科院分区：
文献类型：
--
作者：
Li Xiuzhen;Zhou Wen;Chen Yongqin David
为检验混合单粒子拉格朗日积分轨迹模式（HYSPLIT）对中国东南地区水汽来源和路径的探测能力，对2012年4月1日至2013年3月31日中国东南地区3次典型区域性持续性强降水过程中释放的大气粒子轨迹进行了回溯分析。HYSPLIT模式提供了比水汽通量更有洞察力的信息。对沿着路径的比湿分析揭示了中国东南部水汽的来源及其对水汽供应的贡献。在北半球夏半年，来自印度洋东部、印度洋中部、南海（SCS）和北太平洋西部（WNP）的4条主要水汽输送路径分别贡献了10%、20%、31%和16%的水汽输送到中国东南部。在冬半年，来自西北太平洋和华北地区的路径贡献增加一倍。对暴雨过程的分析表明，在热带风暴条件下，所有的水汽输送路径在到达中国东南部之前都是气旋性旋转的。冷空气的入侵在夏半年和冬半年都能引发强降水，但作用不同：在夏半年，冷空气对水汽的供应没有贡献，但对水汽的汇聚和抬升起着关键作用;而在冬半年，冷空气在穿越西北太平洋时吸收了大量的水汽，从而提供了大量的水汽。
To examine the ability of the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model to detect the origins and paths of moisture supplied to Southeast China, trajectories of air particles released over Southeast China were traced backward during 1 April 2012 to 31 March 2013 and three typical regional persistent heavy rainfall events. The HYSPLIT model provides more insightful information than water vapor flux. Analysis of the specific humidity along the trajectories revealed the origins of moisture and their contributions to the moisture supply in Southeast China. In the boreal summer half year, four key moisture transport paths from the eastern Indian Ocean, central Indian Ocean, South China Sea (SCS), and western North Pacific (WNP) contribute 10%, 20%, 31%, and 16% of the moisture to Southeast China, respectively. In the winter half year, the contributions of the paths from the WNP and North China double. Examination of heavy rainfall events showed that under tropical storm conditions, all moisture transport routines are rotated cyclonically before reaching Southeast China. The invasion of cold air can trigger heavy rainfall in both the summer and winter half years but plays different roles: it does not contribute to the moisture supply but plays a key role in converging and uplifting the moisture in the summer half year, while it supplies a great amount of moisture in the winter half year as it absorbs abundant moisture in crossing the WNP.