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
Analyzing Spatial and Temporal Distribution of Precipitation at Wet or Dry Season in Yarlung Zangbo River Basin Using Empirical Orthogonal Function
作者: 王熊飞 , 陈思思 ：云南师范大学旅游与地理科学学院，昆明; 张嘉琪 ：陕西师范大学旅游与环境学院，西安;
关键词: 雅鲁藏布江流域； 经验正交函数； 干湿季降水； 空间分异； Yarlung Zangbo River Basin； Empirical Orthogonal Function； Precipitation in Wet and Dry Seasons； Spatial and Temporal Variation
摘要: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
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