Variation Characteristics of the Surface Turbulent Flux and the Components of Radiation Balance over the Grassland in the Southeastern Tibetan Plateau

LI Hongyi; XIAO Ziniu; ZHU Yuxiang

doi:10.7522/j.issn.1000-0534.2017.00097

2018 , Vol. 37 >Issue 4: 923 - 935

DOI: https://doi.org/10.7522/j.issn.1000-0534.2017.00097

Variation Characteristics of the Surface Turbulent Flux and the Components of Radiation Balance over the Grassland in the Southeastern Tibetan Plateau

LI Hongyi ,
XIAO Ziniu ,
ZHU Yuxiang

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China Meteorological Administration Training Centre, Beijing 100081, China;State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China

Received date: 2017-09-08

Online published: 2018-08-28

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Abstract

Based on field observations of the grassland over Nyingchi area in the southeastern Tibetan Plateau for the period from 20 May to 9 July 2013, the variation characteristics of the basic meteorological elements, the surface turbulent flux and the components of the radiation balance over the grassland in Nyingchi area under different weather changes were analyzed, and the relationships among these variables and their features under typical sunny day and cloudy day were analyzed emphatically in this paper. The results show that:(1) The change trends among each meteorological elements are match well with each other, the variation of the relative humidity is correlated with that of the precipitation, but that those of the air temperature, ground temperature and wind speed are anti-correlated with that of precipitation; During the observation period, more latent heat than sensible heat is exchanged, sensible heat flux is definitely higher during the days without rain, but latent heat flux is lower, things are the opposite in the precipitation period; The variation of the sensible heat flux is consistent with that of the total solar radiation (DR), and the variations of the reflective solar radiation (UR), the long wave radiation from the earth (ULR), the net radiation (Rn), the surface albedo and the soil heat flux are also correlated with the DR, but that of the long wave radiation from the atmosphere (DLR) is anti-correlated with the DR. (2) The analysis results of the typical sunny day and the typical cloudy day show that the diurnal variation amplitude of sensible heat flux and latent heat flux in sunny condition is larger than that in cloudy condition, during the daytime, the sensible heat flux and the latent heat flux in the typical sunny day is significantly greater than that in the typical cloudy day, except the downward long wave radiation, the other components of the surface radiation balance in the sunny day are much larger than that in the cloudy day; At night, the upward long wave radiation, the net radiation and the soil heat flux in the sunny day are smaller than that in the cloudy day. (3) The maximum value of relative humidity appears in the morning, and the lowest value occurs in the afternoon; The minimum value of wind speed appears in the morning and the maximum value appears at noon, and the values in the sunny day are mostly greater than that in the cloudy day. As a result, the sensible heat flux, latent heat flux, soil heat flux, each components of radiation balance and basic meteorological elements over the grassland at Nyingchi area in the southeastern Tibetan Plateau all have very close coordinated variation relationships with weather changes, the correlation coefficients between these variables are high, and these variables fit well with each other. It shows that this boundary layer observation data has high reliability, and this experiment observed data can provide important data basis for numerical model to simulate the surface-to-air exchange process over Nyingchi area in the southeastern Tibetan Plateau.

Key words： Southeastern Tibetan; Nyingchi area; grassland; surface turbulent fl; components of radiat; basic meteorological

Cite this article

LI Hongyi , XIAO Ziniu , ZHU Yuxiang . Variation Characteristics of the Surface Turbulent Flux and the Components of Radiation Balance over the Grassland in the Southeastern Tibetan Plateau[J]. Plateau Meteorology, 2018 , 37(4) : 923 -935 . DOI: 10.7522/j.issn.1000-0534.2017.00097

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