藏东南峡谷地区不同下垫面地表通量变化特征及其与降水的关系  

Variation Characteristics of Surface Fluxes on Different Underlying Surfaces and Their Relationship with Precipitation in the Canyon Area of Southeast Tibet

作　　者：王灵芝 李茂善 吕钊 伏薇 舒磊 阴蜀城 WANG Lingzhi;LI Maoshan;LÜZhao;FU Wei;SHU Lei;YIN Shucheng(School of Atmospheric Sciences/Plateau Atmosphere and Environment Key Laboratory of Sichuan Province/Joint Laboratory of climate and Environmental Change,Chengdu University of Information Technology,Chengdu 610225,Sichuan,China)

机构地区：[1]成都信息工程大学大气科学学院/高原大气与环境四川省重点实验室/气候环境变化联合实验室,四川成都610225

出　　处：《高原气象》2022年第1期177-189,共13页Plateau Meteorology

基　　金：第二次青藏高原综合科学考察研究项目(2019QZKK0103);国家重点研发计划项目(2018YFC1505702);国家自然科学基金项目(41675106);成都信息工程大学科研基金项目(KYTZ201721)。

摘　　要：利用藏东南峡谷地区排龙站、丹卡站、卡布站、墨脱站四个站点2018年11月至2019年10月的涡动协方差仪观测资料,分析藏东南峡谷地区不同位置入口、中段和末端地表通量变化的特征及其与局地降水的关系。研究表明:地表通量月平均日变化特征为夜间潜热通量大于感热通量,日间呈单峰变化特征。排龙站和丹卡站感热11月至次年4月较强,5月至次年10月较弱,卡布站感热月平均日变化呈波动状,墨脱站感热与潜热月变化特征相同,各站潜热呈先增加后减小趋势。土壤热通量季节变化特征明显,春夏季土壤热通量为正,秋冬季为负,且排龙站土壤热通量季节日变化变化最强,卡布站变化最弱。净辐射季节日变化强度夏季>春季>秋季>冬季,向下和向上长波辐射卡布站最大,丹卡站最小,向下和向上长波辐射夏季最大,长波辐射日峰值出现时间较短波辐射晚。丹卡站,排龙站,墨脱站,卡布站各站的能量闭合率分别为70.86%,68.91%,69.29%,67.23%,且夏季闭合程度高,冬季闭合程度低。各站降水增多时,潜热和土壤热通量增大,感热减小。感热和土壤热通量变化对降水变化的响应较同步,潜热变化对降水的变化有明显的滞后性。In this study,variation characteristics of surface fluxes were analyzed by using the eddy covariance observations from four stations of Pailong,Danka,Kabu,and Motuo in the southeastern gorge area of Tibet from November 2018 to October 2019.Pailong Station is located at the entrance of the Canyon in Southeast Tibet,Danka Station is in the middle section,and Kabu Station and Metuo Station are located at the end of the Canyon in Southeast Tibet.Results show that monthly averaged daily latent heat flux is greater than sensible heat flux at night,and it has a single peak during the day.The sensible heat fluxes at Pailong and Danka stations are stronger from November to April and become weaker from May to October.The changing trend of monthly averaged daily sensible heat flux at Kabu station is fluctuating.Sensible heat flux and latent heat flux at Motuo station have the same variation characteristics,with a characteristic of a single peak change.Latent heat fluxes increase first and then decrease at all four stations.Seasonal variations of soil heat flux are obvious,characterizing positive values in spring and summer and negative values in autumn and winter.And the diurnal variation of soil heat flux in Pailong station was the strongest among all stations,and that of Kabu station was the weakest.The diurnal variation intensity of net radiation flux is summer>spring>autumn>winter.The downward and upward longwave radiation fluxes are the largest at Kabu Station and the smallest at Danka Station at the same time they are the largest in summer.The peak of diurnal longwave radiation flux appears later than the shortwave radiation flux.Energy closure rates of Danka,Pailong,Motuo,and Kabu stations are 70.86%,68.91%,69.29%,and67.23%,respectively.In addition,in these four sites the degree of summer closure is high,while the degree of winter closure is low.Latent heat fluxes and soil heat fluxes increase,and sensible heat fluxes decrease as increasing precipitation at the four stations.The sensible heat flux and soil heat flux

关 键 词：藏东南峡谷地区 热通量 土壤热通量 能量闭合率 降水 

分 类 号：P422.4[天文地球—大气科学及气象学]