[A-CC31_29AM1] 雪氷学

[ACC31-04] 2002年から2013年までのモンゴルTuul川上流域積雪調査による総積雪水量の経年変動

*杉浦 幸之助¹、門田 勤²、飯島 慈裕²、紺屋 恵子²、Zhang Yinsheng³、石川 守⁴、山崎 剛⁵、Purevdagva Khalzan⁶、Davaa Gombo⁶、大畑 哲夫² (1.富山大学極東地域研究センター/海洋研究開発機構、2.海洋研究開発機構、3.中国科学院青蔵高原研究所、4.北海道大学、5.東北大学、6.モンゴル気象水文環境研究所)

キーワード：積雪水量, 積雪, 水資源, 水循環, モンゴル

It is necessary for the southern limit of snow cover and the semi-arid region to be supplied with sustainable water. Mongolia is located in the southern limit and the semi-arid region. The capital, Ulaanbaatar, lies in a valley on the Tuul River. In order to investigate the actual conditions of snow water equivalent (SWE) in the upper Tuul River as water resources, the snow survey in the upper Tuul River has been carried out from 2002 to 2013. We have observed in each February when it will be the maximum amount of SWE. The snow water equivalent was estimated using a cylindrical snow sampler with 0.005-m² area. The total amount of SWE in the upper Tuul River basin was estimated using a global digital elevation model (DEM) with a horizontal grid spacing of 30 arc seconds (GTOP30) and a relationship between altitude and SWE. The main results obtained are shown below. The amount change of SWE in the upper Tuul River basin fluctuates over multiple years. The range of fluctuation was 0.25±0.07km³. It was not necessarily fluctuating in monotone. The steep rise of the amount of SWE in the upper Tuul River basin coincides with increasing air temperature and snowfall roughly.