Plateau Meteorology

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2019 , Vol. 38 >Issue 4: 705 - 715

DOI: https://doi.org/10.7522/j.issn.1000-0534.2019.00036

Observations of Soil Moisture Influence on Surface Energy Dynamics and Planetary Boundary Layer Characteristics over the Loess Plateau

  • MA Yingsai ,
  • MENG Xianhong ,
  • HAN Bo ,
  • YU Ye ,
  • Lü Shihua ,
  • LUAN Lan ,
  • LI Guangwei
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  • Key Laboratory of Land Surface Process & Climate Change in Cold and AridRegions, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;University of Chinese Academy of Sciences, Beijing 100049, China;Guangdong Province Key Laboratory for Climate Change and Natura Disaster Studies, School of Atmospheric Sciences, Zhongshan University, Zhuhai 519082, Guangdong, China;Pingliang Land Surface Process & Severe Weather Research Station, Chinese Academy of Sciences, Pingliang 744015, Gansu, China;College of Atmospheric Sciences, Chengdu University of Information Technology Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu 610225, Sichuan, China;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University ofInformation Science & Technology, Nanjing 210044, Jiangsu, China;Department of Earth and Atmospheric Sciences, Indiana University Bloomington, Indiana 47408, America

Received date: 2018-11-27

  Online published: 2019-08-28

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Abstract

Based on the observational data of land surface processes and disastrous weather observation and research station in Pingliang area of Gansu Province during the summer (June, July and August) of 2016-2017, the effects of soil moisture on surface radiation, surface energy distribution and the development of atmospheric boundary layer in Pingliang area under dry, medium and wet conditions were quantitatively analyzed. And then, according to the general soil moisture change trend, the soil moisture was further divided into dry-medium sections(0.158~0.22 m3·m-3)and medium-wet (0.179~0.325 m3·m-3) sections and the correlation between soil moisture and Bowen's ratio, sensible heat flux and latent heat flux was analyzed to explore the possible physical mechanism of soil moisture affecting precipitation by affecting surface turbulent energy distribution and the development of atmospheric boundary layer. The results show that:(1)Soil moisture has a relatively small impact on albedo, and has a significant impact on Bowen's ratio, mainly affecting sensible and latent heat changes, that is, affecting the process of surface energy distribution. With the increase of soil moisture, latent heat increases, sensible heat decreases and Bowen ratio decreases significantly. The change of soil moisture has a significant impact on net radiation, mainly on net long-wave radiation. With the increase of soil moisture, net short-wave radiation increases slightly and net long-wave radiation increases significantly. (2)Inter-zonal analysis of soil moisture showed that the influence of soil moisture on latent heat flux and boundary layer height was greater in the dry and middle sections (0.158~0.220 m3·m-3) than in the middle and wet sections (0.179~0.325 m3·m-3). That is to say, the change of surface flux and the development of atmospheric boundary layer are more significant when the soil is dry. The results of quantitative analysis of the observations are consistent with the theoretical mechanism, which shows the reliability of the observed data and the data can provide an important data basis for the simulation of the numerical model in the Loess Plateau region.

Key words： Loess Plateau; soil moisture; surface albedo; Bowen ratio; surface radiation en; surface turbulent en; planetary boundary l

Cite this article

MA Yingsai , MENG Xianhong , HAN Bo , YU Ye , Lü Shihua , LUAN Lan , LI Guangwei . Observations of Soil Moisture Influence on Surface Energy Dynamics and Planetary Boundary Layer Characteristics over the Loess Plateau[J]. Plateau Meteorology, 2019 , 38(4) : 705 -715 . DOI: 10.7522/j.issn.1000-0534.2019.00036

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