SHI Yu,XIAO Zi-niu,ZHU Ke-yun.Relationship between Angular Momentum Transportand Precipitation in Eastern China in Summer[J].Journal of Chengdu University of Information Technology,2018,(04):456-463.[doi:10.16836/j.cnki.jcuit.2018.04.016]
夏季角动量输送变化与中国东部降水的关系
- Title:
- Relationship between Angular Momentum Transportand Precipitation in Eastern China in Summer
- 文章编号:
- 2096-1618(2018)04-0456-08
- Keywords:
- atmospheric science; climate change; angular momentum transport; rainfall in eastern China in summer; multivariate variance analysis; significant key area
- 分类号:
- P434+.5
- 文献标志码:
- A
- 摘要:
- 为研究夏季角动量输送与同期中国东部降水的关系,采用多变量方差分析方法及合成分析方法,确定1951-2014年夏季不同雨带类型对应的角动量输送相关区域,再将相关区区域平均角动量输送通量与夏季160站降水求相关找到显著高相关区。最后通过合成分析对比强弱角动量输送年对应的环流场发现角动量输送异常时对中国东部降水的影响机制。研究结果表明夏季角动量输送显著高相关区在(35 °N～45 °N,105 °E～110 °E)地区,该地区角动量输送与中国东部夏季Ⅰ、Ⅲ类雨型分布(即南北降水反相变化分布型)紧密联系。对比强弱输送年对应环流场的差异,发现当欧亚大陆中纬地区纬向环流异常时角动量向北输送减弱或增强,导致东亚副热带高空西风急流的南北移动,南北冷暖空气交界面南北移动,从而影响中国东部夏季南北降水反相变化分布。
- Abstract:
- In order to study the relationship between angular momentum transport and rainfall in eastern China in summer, the multivariate analysis of variance and synthetic method is used. Firstly, the regions relate to the angular momentum transport responding to the three types of rain patterns in eastern China in summer from 1951 to 2014 is determined. Then it is correlated with the summer precipitation at 160 stations in China to find the significant key area. Finally, the influence mechanism of the anomalous angular momentum transport on the precipitation in eastern China is found by comparing the circulation field corresponding to strong and weak angular momentum transport year using synthetic analysis. The results show that the significant key area of angular momentum transport lies in(35 °N～45 °N, 105 °E～120 °E), and it is closely related to the distribution of first and third rain patterns in summer in eastern China. By comparing the difference of the corresponding circulation field in the year of strong and weak angular momentum year, it is found that angular momentum transports decreases or strengthens northward when the zonal circulation is abnormal in the middle latitudes of Eurasia, causing the East Asian subtropical westerly jet stream and the interface of cold and warm air to move toward north or south, ultimately affecting the reverse distribution of summer north and south precipitation in eastern China.
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备注/Memo
收稿日期:2018-02-10基金项目:国家自然科学基金资助项目(41375069)