Comparative study of the soil thermal regime in arid and semi-humid areas
刊物全称
Environmental Earth Sciences
论文作者
Zhenchao Li,Jiaxi Yang,Zhiyuan Zheng,Ye Yu,Tangtang Zhang,Xuhong Hou,Zhigang Wei
发表年度
2017
刊物类别
SCI
卷
76
期
28
影响因子
1.569
通讯作者
Wei, ZG
请求全文
关键词
Arid area, Semi-humid area, Soil heat flux, Soil thermal conductivity
摘要
The thermodynamic properties of soil affect the energy and water exchange processes between land and the atmosphere and represent an underlying surface property that is a focus of land surface models. In this paper, Dunhuang represents the arid area, and Pingliang represents the semi-humid area. Observation data from 2013 to 2015 from two stations are used to comparatively analyse the differences in soil regime. The results indicate that the amplitude of the soil temperature and soil temperature gradient at Dunhuang is obviously greater than that at Pingliang, and the surface net radiation, soil heat flux, and soil thermal conductivity are obviously smaller than those at Pingliang. At Dunhuang, the annual average soil thermal conductivity at 2.5 and 7.5 cm is 0.21 and 0.24 W m(-1) K-1, respectively, whereas at Pingliang, the annual average soil thermal conductivity at 5 and 20 cm is 1.22 and 1.46 W m(-1) K-1, respectively. Without considering the freezing of soil, the relationship between the soil thermal conductivity and soil moisture at the two stations passes the significance test at the level of 99%. The soil heat flux is mainly affected by the surface net radiation. The correlation coefficient between the soil temperature gradient at the two stations and the net radiation and soil heat flux passes the 99% significance test. The estimated proportion of the melting latent heat of ice in the soil layer at 5-20 cm at Pingliang in 2014 and 2015 relative to the heat storage of the soil layer at 5-20 cm in March is 20.53 and 24.65%, respectively. The melting heat absorption of ice causes an increasing soil temperature gradient, and increases the heat flux transferred from surface to deeper soil layers.
- 上一条: Assessment of long-term and large-scale even-odd license plate controlled plan effects on urban air quality and its implication 2018-10-11
- 下一条: Testing and Improving the Performance of the Common Land Model:A Case Study for the Gobi Landscape 2018-10-11
- A study of variation characteristics of Gobi broadband emissivity based on field observational experiments in northwestern China 2018-10-11
- Observational study of surface spectral radiation and corresponding albedo over Gobi, desert, and bareloess surfaces in northwesternChina 2018-10-11
- Integrated modeling of urban–scale pollutant transport: application in a semi–arid urban valley, Northwestern China 2018-10-11
- Seasonal and interannual variation of radiation and energy fluxes over a rain-fed cropland in the semi-arid area of Loess Plateau, northwestern China 2018-10-11
- Effect of soil texture and hydraulic parameters on WRF simulations in summer in east China 2018-10-11