Effect of Mesoscale Land Use Change on Characteristics of Convective Boundary Layer: Semi-Idealized Large Eddy Simulations over Northwest China
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文摘
Although large-scale topography and land use have been properly considered in weather and climate models,the effect of mesoscale and microscale heterogeneous land use on convective boundary layer (CBL) has not been fully understood yet.In this study,the influence of semi-idealized strip-like patches of oases and deserts,which resemble irrigated land use in Northwest China,on the CBL characteristics,is investigated based on the Weather Research and Forecasting (WRF)-large eddy simulation (LES) driven by observed land surface data.The influences of soil water content in oases on aloft CBL flow structure,stability,turbulent kinetic energy (TKE),and vertical fluxes are carefully examined through a group of sensitivity experiments.The results show that secondary circulation (SC)/turbulent organized structures (TOS) is the strongest/weakest when soil water content in oases is close to saturation (e.g.,when the oases are irrigated).With the decrease of soil water content in oases (i.e.,after irrigation),SC (TOS) becomes weak (strong) in the lower and middle CBL,the flux induced by SC and TOS becomes small (large),which has a dramatic impact on point measurement of eddy covariance (EC) fluxes.The flux induced by SC and TOS has little influence on EC sensible heat flux,but great influence on EC latent heat flux.Under this circumstance,the area averaged heat flux cannot be represented by point measurement of flux by the EC method,especially just after irrigation in oases.Comparison of imbalance ratio (i.e.,contribution of SC and TOS to the total flux) reveals that increased soil moisture in oases leads to a larger imbalance ratio as well as enhanced surface heterogeneity.Moreover,we found that the soil layer configuration at different depths has a negligible impact on the CBL flux properties.
来源
Journal of Meteorological Research
,2018,32(3):421-432 【核心库】
DOI
10.1007/s13351-018-7185-8
关键词
oasis and desert
;
land surface heterogeneity
;
large eddy simulation
;
soil water content
;
secondary circulation
;
turbulent organized structure
地址
1.
School of Atmospheric Sciences,Chengdu University of Information Technology, Chengdu, 610225
2.
College of Atmospheric Sciences,Lanzhou University, Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, Lanzhou, 730000
3.
Shenyang Central Meteorological Observatory, Shenyang, 110016
4.
Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences, Lanzhou, 730000
语种
英文
文献类型
研究性论文
ISSN
2095-6037
学科
大气科学(气象学)
基金
Supported by the National Key Research and Development Program of China
;
国家自然科学基金
;
国家教育部高等学校博士学科点专项科研基金
文献收藏号
CSCD:6277735
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