A Study on Surface Flux and the Bulk Transfer Coefficients over Middle Gansu Region of Loess Plateau under the Wheat and Bare Fields

WANG Cheng-hai;HUANG Bao-xia;YANG Xin-guo

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Plateau Meteorology ›› 2007, Vol. 26 ›› Issue (1) : 30-38.

A Study on Surface Flux and the Bulk Transfer Coefficients over Middle Gansu Region of Loess Plateau under the Wheat and Bare Fields

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Abstract

Using the observed data in the middle Gansu region of Loess Plateau,the average diurnal variation of surface energy budget and the bulk transfer coefficients,the relation between the bulk transfer coefficients and the stability and the diurnal variation of the heat flux of the wheat filed during various growing stages are studied.The results show that: In the daytime,most of the net radiation is spent for the latent heat flux,the second is for the sensible heat flux and the soil heat flux is least.The net radiation spent for the latent heat flux increases with growth of the wheat and the net radiation spent for the sensible heat flux decreases at the same time.Bowen ratio decreases with growth of the wheat.At the heights of 10 m,in the wheat field,the average bulk momentum and the sensible heat transfer coefficients are respectively equal to 6.03×10-3 and 3.40×10-3,in the bare soil,they are 5.18×10-3 and 4.08×10-3.At the same observation height,Cd wheat field>Cd bare soil,Ch wheat field<Cd naked bare soil.

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Middle Gansu region / Surface flux / Bulk transfer coeffi

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WANG Cheng-hai , HUANG Bao-xia , YANG Xin-guo. A Study on Surface Flux and the Bulk Transfer Coefficients over Middle Gansu Region of Loess Plateau under the Wheat and Bare Fields. Plateau Meteorology. 2007, 26(1): 30-38

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