Analyzing Spatial and Temporal Distribution of Precipitation at Wet or Dry Season in Yarlung Zangbo River Basin Using Empirical Orthogonal Function
Abstract: According to the monthly precipitation data of 15 meteorological stations in the Yarlung Zangbo river basin during the period from 2000 to 2010, and using the method of empirical orthogonal function (EOF), we respectively calculated the spatial and temporal distribution characteristics of precipitation in wet and dry season and the time-coefficient series. The results showed that the EOF method was capable of revealing the spatial and temporal distributions of precipitation field for the Yarlung Zangbo river basin, with the first four EOFs reflecting the four vector distribution fields; furthermore, we can know that the cumulative contribution rate of precipitation is 99.84% at dry season and 89.81% at wet season. The main space distribution characteristic of dry or wet season precipitation is different distribution from west to east in Yarlung Zangbo river valley. It shows that the precipitation in western district is more than that in eastern district, such as Milin wide valley in the eastern end of Himalayas, which is one of most abundant precipitation areas, because it is influenced by the monsoon climate and the warm moist air flow from the eastern Indian Ocean. However, due to the high altitude, the water vapor is hard to reach the west area. So the precipitation of west area is relatively less compared to the east.
文章引用: 王熊飞 , 陈思思 , 张嘉琪 (2014) 基于EOF的雅鲁藏布江流域干湿季降水变化的时空分异研究。 水土保持， 2， 37-42. doi: 10.12677/OJSWC.2014.24004
 宋理明, 娄海萍 (2006) 环青海湖地区天然草地土壤水分动态研究. 中国农业气象, 2, 151-155.
 高智, 谢双亭 (1992) 陕西汛期降水与前期大气环流遥相关型的联系. 南京气象学院学报, 4, 574-583.
 包云, 李晓兵, 黄玲梅, 等 (2011) 1961-2007 年内蒙古降水时空分布. 干旱区地理, 1, 52-61.
 魏义长, 王纪军, 张芳, 等 (2010) 经验正交函数与地统计相结合分析降水时空变异. 灌溉排水学报, 4, 105-109.
 魏凤英 (1999) 现代气候统计诊断与预测技术. 气象出版社, 北京.
 黄嘉佑 (2000) 气象统计分析与预报方法. 气象出版社, 北京.
 邱海军, 曹明明, 刘闻, 等 (2011) 基于EOF的陕西省降水变化时空分异研究. 水土保持通报, 3, 57-60.