Variation and simulation of surface soil heat flux in Ejin Oasis

doi:10.7522/j.issn.1000-694X.2022.00061

Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (6): 176-184.DOI: 10.7522/j.issn.1000-694X.2022.00061

Variation and simulation of surface soil heat flux in Ejin Oasis

Qiang Li¹(), Simin Liu², Guanlong Gao³^,⁴^,⁵(), Xiaoyou Zhang⁴

^1.Taiyuan Normal University，Jinzhong 030619，Shanxi，China
^2.Economics Development Research Center of National Forestry and Grassland Administration，Beijing 100714，China
^3.Shanxi University，Taiyuan 030006，China
^4.Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^5.Shanxi Laboratory for Yellow River，Taiyuan 030006，China

Received:2022-01-02 Revised:2022-04-11 Online:2022-11-20 Published:2023-01-09
Contact: Guanlong Gao

Abstract

Abstract:

The soil heat flux is an important component of the surface energy balance equation， thus the observation and calculation methods of soil heat flux are of great significance. Aimed at the typical arid area in China-Ejin oasis， and based on the data collected from Alax Desert Eco-Hydrology Research Station， this paper used the gradient calorimetric method to calculate surface soil heat flux and analyzed its variations in different weather conditions （sunny and cloudy days）， results showed that：（1） The total， average， maximum and amplitude values of surface soil heat flux on sunny days were significantly greater than those on cloudy days. （2） During the observation period， the surface soil heat flux generally increased firstly， and then decreased， with the maximum and minimum values appearing in the middle of July and early October， respectively， and the difference between them was more than 900 W·m^-2. （3） No matter it is a sunny or cloudy day， the net radiation reaches zero firstly both in the morning and evening， and also reaches peak values around noon firstly. （4） Taking the absolute value of surface soil heat flux， we can see that the values on sunny days were always greater than those on cloudy days regardless of day and night. （5） The ratio of soil heat flux to net radiation in a day decreased with time. （6） The values of surface soil heat flux estimated by the forced-restore method are in good agreement with the measured values， the forced-restore method can be used to simulate the surface soil heat flux in Ejin Oasis.

Key words: soil heat flux, gradient calorimetric method, forced-restore method, Ejin Oasis

CLC Number:

P463.23

Qiang Li, Simin Liu, Guanlong Gao, Xiaoyou Zhang. Variation and simulation of surface soil heat flux in Ejin Oasis[J]. Journal of Desert Research, 2022, 42(6): 176-184.

Figures/Tables 11

Fig.1 Location of the study area

Table 1 Instruments for the observation of soil temperature， humidity， heat flux and net radiation

名称	型号	生产厂商/国家	安装位置/m
土壤热通量板	HFP01	HUKSEFLUX/荷兰	地下0.1、0.3
土壤温湿度传感器	SMC300	Spectrum/美国	地下0.1、0.3
净辐射	CNR4	Kipp & Zonen/荷兰	地表

Fig.2 Diurnal variations of soil temperatures at 0.1 m and 0.3 m depth underground of the study site on sunny and cloudy days

Fig.3 Variations of soil temperatures at 0.1 m and 0.3 m depth underground of the study site

Fig.4 Diurnal variations of soil heat fluxes at the earth's surface， and the 0.1 m and 0.3 m depth underground of the study site on sunny and cloudy days

Fig.5 Monthly variarion of soil heat flux at the earth's surface of the study site during the observation period

Fig.6 Relationship between soil heat flux at the earth's surface and net radiation at the study site

Fig.7 Modeling of soil heat flux at the earth’s surface at the study site

Table 2 Verification of soil heat flux at the earth's surface at the study site

天气条件	E₁	d₁	MAE	R²
晴天	0.844	0.918	5.678	0.986
阴天	0.819	0.907	4.117	0.971

Table 3 Influence of soil heat flux exerted on the energy balance ratio

能量平衡闭合率	月份
能量平衡闭合率	5	6	7	8	9	10
(H+LE)/ (R_n- G_0.1)	0.74	0.81	0.83	0.84	0.87	0.85
(H+LE)/(R_n- G₀)	0.77	0.85	0.88	0.90	0.92	0.89

Fig.8 Variations of sensible and latent heat fluxs during the study period

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Variation and simulation of surface soil heat flux in Ejin Oasis

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