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Study of Estimation of Soil Heat Flux at a Wheat Field in Semi-Arid Area of Loess Plateau

Journal

Plateau Meteorology

Authors

Chen Xing, Yu Ye, Chen Jinbei, Zhang Tangtang, Li Zhenchao

Year

2014

Volume

33

Issue

6

Pages

1514-1525

Corresponding Author

Yu, Y

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yyu@lzb.ac.cn

Keywords

Soil heat flux; Integrate temperature method; Temperature prediction-correction method; Harmonic analysis; Soil water flux; Energy balance; Loess Plateau

Abstract

Three methods, i.e. integrate temperature method (ITHP), temperature prediction-correction method (TDEC) and harmonic analysis technique (HM), for the estimation of soil heat flux after rain were evaluated for a winter wheat field in the semi-arid area of Loess Plateau using data collected at the Pingliang Land Surface Process & Severe Weather Research Station. The influences of heat transferred by the soil water movement on the soil heat flux were discussed. The soil is highly heterogeneity in the vertical with the thermal diffusivity in the depth of 0.05~0.10 m being about 3 times of that in the depth of 0.10~0.20 m. The peak soil heat flux at 0.05 m depth calculated by the ITHP method, the TDEC method and the HM technique are smaller than the measured by about 23.6%, 25.0% and 12.8%, respectively. Compared to the direct measurements by a soil heat plate at 0.05 m depth, the ground heat flux calculated with the ITHP method, the TEDC method and the HM technique can improve the surface energy budget closure by 7.96%, 4.54% and 5.65% at the winter wheat site in the Loess Plateau, respectively. The transportation of water vapor and the corresponding phase transition in the agricultural soil played a role in ground heat flux.
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