Estimating the Soil Thermal Parameters and Modeling the Soil Temperature in Litang of Qinghai-Xizang Plateau

ZHANG Yonghui; GAO Zhiqiu; TONG Bin

doi:10.7522/j.issn.1000-0534.2016.00015

Plateau Meteorology >

2017 , Vol. 36 >Issue 1: 33 - 44

DOI: https://doi.org/10.7522/j.issn.1000-0534.2016.00015

Estimating the Soil Thermal Parameters and Modeling the Soil Temperature in Litang of Qinghai-Xizang Plateau

ZHANG Yonghui ,
GAO Zhiqiu ,
TONG Bin

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Nanjing University of Information Science & Technology, School of Applied Meteorology, Nanjing 210044, China;Nanjing University of Information Science & Technology, School of Geography & Remote Sensing, Nanjing 210044, China

Received date: 2015-08-12

Online published: 2017-02-28

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Abstract

In order to obtain the soil thermal parameters accurately, the soil thermal diffusivity is calculated by phase method, amplitude method and thermal conduction-convection algorithm respectively, and water flux density is calculated by the thermal conduction-convection algorithm, using the soil temperature data collected from Litang site over Qinghai-Xizang Plateau during 27 August to 4 September 2006.Taking the soil temperature at the surface as the upper boundary, the temperature during 19 to 21 September 2006 for the soil layers at the depth of 10 cm, 15 cm and 20 cm are modeled by the three methods mentioned before based on the computed soil thermal diffusivity and water flux density results.The results show that:due to taking the soil water movement into account, the correlation coefficients between the modeled values simulated by thermal conduction-convection algorithm and the observed data are the highest, r_10cm=0.97, r_15cm=0.98 and r_20cm=0.99, respectively, confidence level is 99%.On the depth of 0.1 m, the soil temperature phase shift is overestimated about 0.21 hours by the thermal conduction-convection algorithm.However, the amplitude methods overestimate the phase shift more than 0.45 hours.The daily amplitude of soil temperature is overestimated about 0.79℃ by the thermal conduction-convection algorithm, but more than 0.96℃ by the phase methods.The thermal conduction-convection algorithm simulates the soil temperature better than the other two methods.

Key words： Qinghai-Xizang Plate; Soil temperature; Phase methods; Amplitude methods; Thermal Conduction-c

Cite this article

ZHANG Yonghui , GAO Zhiqiu , TONG Bin . Estimating the Soil Thermal Parameters and Modeling the Soil Temperature in Litang of Qinghai-Xizang Plateau[J]. Plateau Meteorology, 2017 , 36(1) : 33 -44 . DOI: 10.7522/j.issn.1000-0534.2016.00015

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