ZHAO Yan-bin,XIAO Tian-gui.The Temporal and Spatial Distribution of Heavy Rainfall in Sichuan[J].Journal of Chengdu University of Information Technology,2016,(01):94-101.
四川地区强降水的时空分布特征
- Title:
- The Temporal and Spatial Distribution of Heavy Rainfall in Sichuan
- 文章编号:
- 2096-1618(2016)01-0094-08
- Keywords:
- atmospheric sciences; climate change; Sichuan area; heavy rainfall; temporal and spatial distribution
- 分类号:
- P467
- 文献标志码:
- A
- 摘要:
- 为研究四川地区强降水特征,利用1966 ~ 2013 年的逐日降水资料给出四川地区强降水的定义,并利用 统计学方法分别对强降水次数和强度的时空特征进行分析,结果表明:四川盆地地区较其它地区强降水事件次数 偏多,强度偏强,强降水主要发生在夏季,与夏季降水相关性最好,其次是秋季和春季,和冬季降水的相关性最差。 四川地区强降水事件次数空间表现为第一模态盆地正异常,周边负异常;第二模态为盆地负异常,周边正异常;第 三模态为南北反向型,四川地区强降水强度则分别表现为第一模态盆地负异常,周边正异常;第二模态全区基本一 致;第三模态自北向南呈现“-+-冶。强降水事件最集中的时间段为6 ~9 月,强中心位于8 月。强降水事件集中发 生的年份有明显的2 ~4 年的年际变化。为四川地区强降水的相关预测预报提供气候背景。
- Abstract:
- In order to study the characteristics of heavy rainfall in Sichuan, with the daily precipitation data of 1966- 2013, giving the definition of heavy rain in Sichuan, and us the statistical methodsthe spatial and temporal characteris- tics of the times and intensity of heavy rainfall in Sichuan. The main conclusions are as follows: The number of heavy rainfall events in basin is more than other areas, and the strength of heavy rainfall basin is higher than other areas. Heavy rainfall occurs mainly in the summer, it has a best correlation with summer rainfall, followed by the fall and spring, and a worst correlation with winter rainfall. The space of the number of heavy rainfall in Sichuan shows that the basin is positive anomaly and negative anomaly around in first model; the basin is negative anomaly and positive anomaly around in second model; the north-south reverse type in third model. The space of the strength of heavy rainfall in Si- chuan shows that the basin is negative anomaly and positive anomaly around in first model; Sichuan is basically the same in second model; from north to south as “-+-冶in third model. Heavy precipitation events most concentrated period 6- 9 months, most concentrated in August. eavy rain events occurred concentrated 2-4 years of annual variation. It pro- vides the climate background for the forecast of heavy rainfall in Sichuan.
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备注/Memo
收稿日期:2015-04-14 基金项目:国家自然科学基金资助项目(91337215);国家重点基础 研究发展计划973 资助项目(2012CB417202,2013CB733206);四川省科 技资助项目(2013JY0063)