气候变化领域集成服务门户(CCPortal): Simulation analysis of local land atmosphere coupling in rainy season over a typical underlying surface in the Tibetan Plateau

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DOI	10.5194/hess-24-5937-2020
	Simulation analysis of local land atmosphere coupling in rainy season over a typical underlying surface in the Tibetan Plateau
	Sun, Genhou; Hu, Zeyong; Ma, Yaoming; Xie, Zhipeng; Wang, Jiemin; Yang, Song
通讯作者	Sun, GH (通讯作者)
发表日期	2020
ISSN	1027-5606
EISSN	1607-7938
起始页码	5937
结束页码	5951
卷号	24 期号:12
英文摘要	The local land-atmosphere coupling (LoCo) investigates the interactions between soil conditions, surface fluxes, planetary boundary layer (PBL) growth, and the formations of convective clouds and precipitation. Studying LoCo over the Tibetan Plateau (TP) is of great significance for understanding the TP's role in the Asian water tower. A series of real-case simulations, using the Weather Research and Forecasting (WRF) model with different combinations of land surface model (LSM) schemes and PBL schemes, has been carried out to investigate the LoCo characteristics over a typical underlying surface in the central TP in the rainy season. The LoCo characteristics in the study area are analyzed by applying a mixing diagram to the simulation results. The analysis indicates that the WRF simulations, using the Noah with BouLac, Mellor-Yamada Nakanishi and Niino Level-2.5 PBL (MYNN), and Yonsei University (YSU) produce closer results to the observation in terms of curves of C-p . theta and L-v.q, surface fluxes (H-sfc and LEsfc), entrainment fluxes (H-ent, and LEent) at site BJ of Nagqu Station (BJ/Nagqu) than those using the Community Land Model (CLM) with BouLac, MYNN, and YSU. The frequency distributions of H-sfc, LEsfc, H-ent, and LEent in the study area confirm this result. The spatial distributions of simulated H-sfc, LEsfc, H-ent, and LEent, using WRF with Noah and BouLac, suggest that the spatial distributions of H-sfc and LEsfc in the study area are consistent with that of soil moisture, but the spatial distributions of H-ent and LEent are quite different from that of soil moisture. A close examination of the relationship between entrainment fluxes and cloud water content (Q(Cloud)) reveals that the grids with small H-ent and large LEent tend to have high Q(Cloud) and H-sfc, suggesting that high H-sfc is conducive to convective cloud formation, which leads to small H-ent and large LEent. A sensitivity analysis of LoCo to the soil moisture at site BJ/Nagqu indicates that, on a sunny day, an increase in soil moisture leads to an increase in LEsfc but decreases in H-sfc, H-ent, and LEent. The sensitivity of the relationship between simulated maximum daytime PBL height (PBLH) and mean daytime evapotranspiration (ET) in the study area to soil moisture indicates the rate at which the maximum daytime PBLH decreases with the mean ET increase as the initial soil moisture goes up. The analysis of simulated H-sfc, LEsfc, H-ent, and LEent under different soil moisture conditions reveals that the frequency of H-ent ranging from 80 to 240 W m(-2) and the frequency of LEent ranging from -240 to -90 W m(-2) both increase as the initial soil moisture increases. Coupled with the changes in Q(Cloud), the changes in H-ent and LEent as the initial soil moisture increases indicate that the rise in soil moisture leads to an increase in the cloud amount but a decrease in Q(Cloud).
关键词	BOUNDARY-LAYER SOIL-MOISTURE DATA ASSIMILATION ENERGY BUDGET MODEL LAKE EVAPOTRANSPIRATION IMPROVEMENT TURBULENCE CLOSURE
语种	英语
WOS研究方向	Geology ; Water Resources
WOS类目	Geosciences, Multidisciplinary ; Water Resources
WOS记录号	WOS:000600078500001
来源期刊	HYDROLOGY AND EARTH SYSTEM SCIENCES
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259824
推荐引用方式 GB/T 7714	Sun, Genhou,Hu, Zeyong,Ma, Yaoming,et al. Simulation analysis of local land atmosphere coupling in rainy season over a typical underlying surface in the Tibetan Plateau[J]. 中国科学院青藏高原研究所,2020,24(12).
APA	Sun, Genhou,Hu, Zeyong,Ma, Yaoming,Xie, Zhipeng,Wang, Jiemin,&Yang, Song.(2020).Simulation analysis of local land atmosphere coupling in rainy season over a typical underlying surface in the Tibetan Plateau.HYDROLOGY AND EARTH SYSTEM SCIENCES,24(12).
MLA	Sun, Genhou,et al."Simulation analysis of local land atmosphere coupling in rainy season over a typical underlying surface in the Tibetan Plateau".HYDROLOGY AND EARTH SYSTEM SCIENCES 24.12(2020).