1109 / 2019-07-22 16:49:15

Energy and mass balance of the east branch of Urumqi Glacier No. 1, Chinese Tian Shan

15、冰冻圈科学 > 专题2：冰冻圈与水资源：过程、机理与预测

Energy and mass balance is quantified using an energy-balance model to represent glacier melt of Urumqi Glacier No. 1, Chinese Tian Shan. Based on data from an Automatic Weather Station (4025 m a.s.l) and the mass balance field survey data nearby on the East Branch of Glacier No. 1, the ‘COupled Snowpack and Ice surface energy and Mass balance model’ (COSIMA) is used to derive energy and mass balance simulations during the ablation season of 2018. Results show that the modeled cumulative mass balance (-0.67±0.03 m w.e.) agrees well with the in-situ measurement and the difference is within 5% during the study period. Their correlation coefficient reaches 0.96. The correlation coefficient between modeled and observed surface temperatures is 0.88 for daily mean. The main sources of melt energy are net shortwave radiation (84%) and sensible heat flux (16%). The main energy expenditures are net longwave radiation (55%), heat flux for snow/ice melting (32%), latent heat flux of sublimation and evaporation (6%), and subsurface heat flux (6%). The sensitive test of mass balance to climate factors shows that mass balance is more sensitive to temperature increase and precipitation decrease than temperature decrease and precipitation increase.