Advances in Earth Science ›› 2021, Vol. 36 ›› Issue (8): 810-825. doi: 10.11867/j.issn.1001-8166.2021.065
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Qiaoyi WANG 1( ),Yaoming MA 1, 2, 3, 4( ),Binbin Wang 2, 3,Hongchao Zuo 1
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Qiaoyi WANG,Yaoming MA,Binbin Wang,Hongchao Zuo. Comparative Analysis of Surface Energy Flux and Evapotranspiration over the Northern and Southern Slopes of the Himalayas[J]. Advances in Earth Science, 2021, 36(8): 810-825.
Based on the observation data of Nagqu Station， Qomolangma Station and Muztagh Station on the northern slope，and Kirtipur Station， Simara Stationand Tarahara Station on the southern slope of the Himalayas in 2016， the characteristics of land-atmosphere interaction and evapotranspiration in the six stations were compared and analyzed. The soil temperature forecast correction method （TDEC） was used to calculate the soil heat flux， which can help to analyze the surface energy balance closure ratio of each station. This study shows thesignificance in understanding the surface layer energy exchange and material transportation in the surface layer of the northern and southern slopes of the Himalayas， which can provide a reference for the study of regional climate. The results show that the surface heating on the northern slope of the Himalayas is dominated by sensible heat flux while in the southern slope area it is dominated by the latent heat flux. The surface radiation balance components between the north and south slopes show significant difference： the shortwave radiation on the north slope is higher than that on the south slope； the long-wave radiation washigher on the southern slope than that on the northern slope； the net radiation on the southern slope ishigher in winter， and there islittle difference between the northern and southern slopes in other seasons； the surface albedo shows a typical "U"-shaped diurnal variation feature， with albedo values of 0.25~0.40 on the northern slope and 0.1~0.2 on the southern slope， and the energy balance closure rates of Nagqu Station， Qomolangma Station， Muztagh Station， Kirtipur Station， Simara Station and Tarahara Station are 85.1%， 51.2%， 53.5%， 64.3%， 65.6%， 68.2%， respectively. Generally， the energy closure ratio of each stationin the southern slope area is better than that in the northern slope area； the evapotranspiration shows significant seasonal variations， with the highest value in summer， followed by autumn and spring， and the smallest value in winter. The cumulative monthly evapotranspiration of each station in the northern slope area except Nagqu Station is less than that in the southern slope area.