Characteristics of precipitation in the rainy season of Koxkar Glacier, Tianshan Mountain, China

Precipitation is widely recognized as the major driving force of hydrologic system, and changes of its pattern could have direct impacts on water resources, especially in mountains. The total precipitation and rain days based on observation were analysed in Koxkar glacier catchment in rainy season during the period of 2009 - 2016. The results have shown that the total precipitation of rainy season fluctuates randomly with no significant trend of increasing or decreasing. The rain days of different precipitation classes differ noticeably, and are inconsistent with the contribution of total precipitation in rainy season. The maximum daily precipitation influences the monthly precipitation. These characteristics of rainy season precipitation display the important factor for the study of glacier changes.