Characteristic of precipitation concentration index in Qilan mountains, Northwest China

Start your abstract here Precipitation played a major role in providing water supply in the arid and semi-arid regions of mountains during the main contributor to runoff. The climate trend was analyzed by using precipitation concentration index for 47 meteorological stations that are located inside and surrounding the Qilian Mountains. The results have shown that the distribution of precipitation concentration index is increasing from eastern to western, and is larger in northern slope than that in southern slope. The precipitation concentration index has a good linear relationship with the latitude and longitude, and complicated with the altitude. The trend of precipitation concentration index is more significant in the west which is affected by westerly circulation than that in the east which is influenced by East Asian monsoon in Qilian mountains.