| 摘要: |
| 本文通过对贵州夏季降水距平百分率场EOF的分解、贵州夏季降水距平百分率与WF指数的相关性和合成分析,以及850hPa纬向风距平场合成分析中,得出如下结论：(1)贵州夏季降水距平百分率场EOF的分解,所得出对应的基本分布型,即东北-西南向为负值中心,整个贵州省均为同一符号,贵州夏季降水降水距平百分率场具有相当高的一致性,时间系数绝对值越大,表明对应年份这种空间分布型越明显。且第一模态时间系数与WF指数的相关通过了信度(t=0.05)的检验,表明第一模态的空间分布的典型性变化与WF指数的变化是对应的。(2)标准化WF指数的线性趋势每百年以0.79的趋势减小,标准化WF指数5点平滑变化曲线呈现年代际的变化特征,周期9～10年。(3)与贵州夏季降水距平百分率的相关中,通过信度(t=0.05)的区域主要集中在贵州省北部、黔东南与黔南交界。且除黔西南的西南角为正相关外,其余省大部地区都是负相关。(4)850hPa纬向风距平场在WF指数在强、弱季风年合成中,在WF指数强季风年,关键区Ⅰ、Ⅱ主要盛行西风,在这种环流形势下贵州夏季降水距平百分率场是偏少；当关键区Ⅰ盛行东风,关键区Ⅱ北部是西风,南部是东风,贵州夏季降水偏多。 |
| 关键词: Wang and Fan指数;贵州夏季降水 |
| DOI： |
| 投稿时间：2018-11-21修订日期：2018-11-21 |
| 基金项目: |
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| The characteristics of summer precipitation in Guizhou and its relation with Wang and fan index |
| LIAO Hongmin,HE Wei,SHI Wei,WU Jinlin,WANG Lili,LUO Junyi |
| (Yuping Meteorological Station in Guizhou Province) |
| Abstract: |
| This paper based on the analysis of EOF,the correlation between WF index and the percent of the rainfall anomaly in Guizhou,synthetic analysis of the percent of the rainfall anomaly in Guizhou and 850hPa weft wind, the following conclusion is that:(1) through the EOF of the percent of the rainfall anomaly in Guizhou,basic distribution type is northeast-southwest direction what is the negative center,the entire in Guizhou is the same symbol, and the percent of the rainfall anomaly in Guizhou has a fairly high degree of consistency. The greater the absolute value of the time coefficient, the more obvious the spatial distribution pattern of the corresponding year. The correlation between the first modal time coefficient and the WF index passes the test of reliability(T = 0.05), indicating that the typical change in the spatial distribution of the first mode corresponds to the change of the WF index.(2)The linear trend of the standardized WF index decreases with a trend of 0.79 per hundred years. The five-point smooth change curve of the standardized WF index exhibits decadal changes with a period of 9 to 10 years. (3)In the correlation with the percent of the rainfall anomaly in Guizhou, the areas passing through the reliability(T = 0.05) are mainly concentrated at the Northern in Guizhou,common border of Qiannan and Qianxinan . In addition to the positive correlation in the southwest of Qianxinan, it is basically negative correlation. (4)In the strong and weak monsoon years of the WF index, in the 850hPa weft wind field, When westerly wind is prevalent in both key areas, summer precipitation in Guizhou is less; When the key area Ⅰ prevails in the east wind, the North of key area Ⅱis the West wind, and the South is the east wind,summer precipitation in Guizhou is more. |
| Key words: Wang and fan index;Summer precipitation in Guizhou |
