LI Yi-tong,ZHAO Lin-na,GONG Yuan-fa,et al.The Relationship and Formation of Springtime Southern Branch Trough and Precipitation in China[J].Journal of Chengdu University of Information Technology,2017,(03):282-288.[doi:10.16836/j.cnki.jcuit.2017.03.009 ]
春季南支槽与中国降水的关系及成因
- Title:
- The Relationship and Formation of Springtime Southern Branch Trough and Precipitation in China
- 文章编号:
- 2096-1618(2017)03-0282-07
- Keywords:
- climatology; climate variation; springtime southern branch trough(SSBT); intensity index; precipitation
- 分类号:
- P468.O+24
- 文献标志码:
- A
- 摘要:
- 春季南支槽的变化特点及其与中国降水的关系,以及春季南支槽影响下的大气环流特征的研究具有重要意义。采用1948-2013年中国160个测站的月降水量和再分析资料,利用涡度场特征定义南支槽强度指数表示南支槽强弱变化。运用相关分析、对比分析方法研究春季南支槽与中国降水的关系及成因。结果表明:近66年春季南支槽有增强的趋势。春季南支槽强度指数越大南支槽越强,长江中部及西南部分地区降水越多,反之亦然。强弱春季南支槽年降水与环流系统关系密切,强年各高度上的环流系统配合紧密,有利于降水。弱年中国大部分地区为负距平,青藏高原一带正距平,不利于降水。 春季南支槽的强度和作用很大程度上反映了西风带南支波动本身的特征。春季南支槽的强度随着年际而变化的特征明显,对中国降水有显著的影响。
- Abstract:
- The studies on characteristics of Springtime Southern Branch Trough(SSBT)and its relationship with precipitation in China as well as atmospheric circulation characteristics are of great significance. Based on reanalyzed data and monthly precipitation data at 160 observation stations provided by NMIC, the index of south branch trough is defined by the vorticity field to represent the intensity of SSBT. Moreover, the relationship between SSBT and precipitation in China is studied by using correlation analysis and comparative analysis. The results of the analysis indicated that the intensity of SSBT has an increasing trend in the past 66 years. And the smaller the intensity index of SSBT is that, the stronger the SSBT is the more precipitation in the middle parts of the Yangtze River and southwestern of China. Precipitation in China is closely related to atmospheric circulation during the stronger/weaker SSBT years. Circulation system cooperate closely in all geopotential height is advantage to the precipitation in stronger SSBT years. The geopotential height anomaly on most parts of China is negative and it is positive on the Qinghai-Tibet Plateau, which is disadvantage to the precipitation in weaker SSBT years.
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备注/Memo
收稿日期:2016-10-31 基金项目:国家自然科学基金资助项目(41475044,91437104); 国家科技支撑计划资助项目(2015BAK10B03); 国家重点基础研究发展计划资助项目(2015CB452806); 国家重大专项资助项目(2013ZX07304-001-1)