Sensible and latent heat flux response to diurnal variation in soil surface temperature and moisture under different freeze/thaw soil conditions in the seasonal frozen soil region of the central Tibetan Plateau |
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| Authors: | Donglin Guo Meixue Yang Huijun Wang |
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| Institution: | (1) Nansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China;(2) State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China;(3) Graduate University of the Chinese Academy of Sciences, Beijing, 100049, China; |
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| Abstract: | The relationship between sensible and latent heat flux and diurnal variation in soil surface temperature and moisture under
four freeze/thaw soil conditions was investigated using observed soil temperature and moisture and simulated sensible and
latent heat flux. The diurnal range of latent heat flux had a similar temporal change pattern as that of unfrozen soil water
at depths of 0–3 cm during the freezing stage. Also, there was a better relationship with the diurnal range of unfrozen soil
water at depths of 3–6 cm during the thawing stage. Diurnal variation in latent heat flux was significant and depended mostly
on solar radiation during the completely thawed stage. However, while diurnal variation in solar radiation during the completely
frozen stage was significant, for latent heat flux it was quite weak due to low unfrozen soil water content. Thus, diurnal
variation in latent heat flux depended mostly on unfrozen soil water content during this stage. During the freezing and thawing
stages, diurnal variation in latent heat flux was also significant and depended mostly on diurnal variation in unfrozen soil
water content. However, the impacts of air temperature change from solar radiation on latent heat flux could not be ignored. |
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