WU Shu-yan,GU Jian-feng,LIU Hai-wen,et al.Interannual Relationship between Winter Snow Depth over TibetanPlateau and Summer Precipitation over Chongqing[J].Journal of Chengdu University of Information Technology,2018,(02):184-189.[doi:10.16836/j.cnki.jcuit.2018.02.013]
高原冬季雪深与重庆夏季降水的年际关系研究
- Title:
- Interannual Relationship between Winter Snow Depth over TibetanPlateau and Summer Precipitation over Chongqing
- 文章编号:
- 2096-1618(2018)02-0184-06
- Keywords:
- meteorology; accumulated snow; Tibetan Plateau; rainfall in Chongqing; interannual relationship
- 分类号:
- P466
- 文献标志码:
- A
- 摘要:
- 为了探究青藏高原冬季雪深对重庆夏季降水的影响,利用地面观测资料和NCEP/ NCAR再分析资料集等资料,使用相关分析、合成分析等方法,分析了二者之间的年际关系。结果表明:冬季高原积雪与重庆夏季降水之间存在着显著的正相关关系,当前期青藏高原冬季雪深越深(浅),重庆夏季降水则偏多(少)。青藏高原冬季积雪影响重庆夏季降水的主要原因是当前期青藏高原积雪异常偏深时,在当年夏季,中国大陆东部以及西太平洋地区500 hPa位势高度距平场呈“+-+”“三极”型分布,表明副热带高压异常偏南,东亚夏季风偏弱,异常偏弱的东亚夏季风使得来自南海、中南半岛和日本海的两支水汽在长江流域辐合,有利于重庆夏季降水的偏多; 当青藏高原积雪偏浅时,中国大陆东部以及西太平洋地区500 hPa位势高度呈“+-”“偶极”型分布,副热带高压异常偏北,东亚夏季风异常偏强,使得来自索马里越赤道的异常偏强的水汽一直延伸到我国的东北地区,重庆在单一的暖湿气流控制之下,不利于在重庆地区形成水汽的辐合,导致重庆夏季降水偏少。
- Abstract:
- Using observations and NCEP/NCAR reanalysis data,this paper investigates the interannual relationship between the winter snow depth over the Tibetan Plateau(TP)and the summer rainfall in Chongqing.Results show a significant positive correlation between them, which indicates more(less)summer rainfall in Chongqing when preceding winter snow depth is deeper(shallower)over the TP. Mechanism analysis reveals that when the winter snow depth over the TP is deeper, a tripole appears in the Eastern China and western Pacific in terms of 500 hPa geopotential height anomalies. It suggests a southward displacement of the subtropical high and thus a weaker East Asian summer monsoon(EASM). Further, this circulation pattern induces the water vapor from South China Sea and Indo-China Peninsula to converge in Yangtze River basin, which is favorable for more precipitation in Chongqing. However, when the winter snow depth over the TP is shallower, the EASM intensifies with the subtropical high moving northward and an anomalous dipole in the 500 hPa geopotential height. The water vapor of the Somalian cross-equatorial stream flow stretches into the Northeast China. Chongqing experiences less summer rainfall due to the worse convergence condition dominated by the single warm and moist air.
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备注/Memo
收稿日期:2017-03-07基金项目:国家自然科学基金重点资助项目(91337215); 四川省科技处应用基础基金资助项目(2015JY0109); 重庆市气象局开放式研究基金资助项目(KFJJ-201102、YU-XM-201103028)