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Variation Characteristics of Surface Fluxes on Different Underlying

Surfaces and Their Relationship with Precipitation
in the Canyon Area of Southeast Tibet

WANG Lingzhi，LI Maoshan，LÜ Zhao，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）

Abstract：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 Ti‐
bet，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 aver‐
aged 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 posi‐
tive 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 diur‐
nal variation intensity of net radiation flux is summer>spring>autumn>winter. The downward and upward long‐
wave 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%，and
67. 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 in‐
creasing precipitation at the four stations. The sensible heat flux and soil heat flux respond synchronously to pre‐
cipitation changes，and the changes in latent heat have a significant lag in response to precipitation changes.
Key words：Canyon area in southeast Tibet；turbulent heat fluxes；soil heat flux；energy closure rate；precipita‐
tion