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Study on Micrometeorological Characteristics of Near Surface
Layer in Emeishan Area

CHANG Na，LI Maoshan，WANG Lingzhi，GONG Ming，FU Wei，SHU Lei
（College of Atmospheric Sciences，Chengdu University of Information Technology / Sichuan Key Laboratory of Plateau Atmosphere
and Environment / Joint Laboratory of Climate and Environment Change，Chengdu 610225，Sichuan，China）

Abstract：The land surface process of the Qinghai-Xizang（Tibet）Plateau has an important impact on China's
weather and climate. Mount Emei is in the southeast edge of the Qinghai-Xizang（Tibet）Plateau. It is necessary
place for the eastward movement of the plateau system，and the place where the southwest vortex begins to devel‐
op. Based on the atmospheric boundary layer gradient tower data，radiation observation data and surface flux da‐
ta of Emeishan station on the eastern edge of Qinghai-Xizang（Tibet）Plateau from December 2019 to November
2020，this paper uses the eddy correlation method to analyze the changes of surface flux and evapotranspiration
near the surface layer in Emeishan area，and estimates the zero plane displacement，aerodynamic roughness，
aerothermal roughness Kinetic and thermodynamic parameters such as momentum flux transport coefficient and
sensible heat flux transport coefficient. The main conclusions are as follows：The temperature in the canopy is
higher than that in the canopy during the day，but the opposite at night. The relative humidity in the canopy is
higher than that on the canopy，and the diurnal variation of wind speed near the ground is more obvious in the up‐
per layer than that in the lower layer. The seasonal variation characteristics of near ground temperature，relative
humidity and wind speed are obvious. The vertical wind profile has significantly different correlation and inflec‐
tion point phenomenon in the canopy and above the canopy. The growth rate of wind speed below the inflection
point with height is significantly smaller than that above the inflection point. The annual average value of zero
plane displacement d is 10. 45 m；The annual mean values of aerodynamic roughness Z 0m and thermodynamic
roughness roughness Z are 1. 65 m and 9. 95 m respectively. The annual average values of momentum flux trans‐
0h
-3
port coefficient C and sensible heat flux transport coefficient C are 1. 58×10 and 3. 79×10 respectively. Aero‐
-2
H
D
dynamic roughness fluctuates greatly with season，while aerothermodynamic roughness is opposite. The occur‐
rence times and amount of precipitation have obvious seasonal changes. There are more precipitation days and
precipitation in July，and the daily change of precipitation is obvious，showing the typical characteristics of night
rain in Western Sichuan Basin. The daily variation amplitude of sensible heat flux and latent heat flux is large.
The latent heat flux is dominant in summer and sensible heat transport is dominant in winter. The evapotranspira‐
tion of each day mainly occurs from 08:00（Beijing Time the same as after）to 17:00，and reaches the maximum
from 11:00 to 14:00，and the seasonal difference is obvious.
Key words：Emeishan area；near surface layer；radiation budget；sensible heat and latent heat flux；evaporation