DOI: 10.5194/hess-24-5937-2020
论文题名: Simulation analysis of local land atmosphere coupling in rainy season over a typical underlying surface in the Tibetan Plateau
作者: Sun G. ; Hu Z. ; Ma Y. ; Xie Z. ; Wang J. ; Yang S.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2020
卷: 24, 期: 12 起始页码: 5937
结束页码: 5951
语种: 英语
Scopus关键词: Boundary layers
; Clouds
; Microgrids
; Precipitation (meteorology)
; Sensitivity analysis
; Spatial distribution
; Surface measurement
; Water towers
; Weather forecasting
; Community land models
; Frequency distributions
; Initial soil moisture
; Land surface models
; Land-atmosphere couplings
; Planetary boundary layers
; Real-case simulations
; Weather research and forecasting models
; Soil moisture
; boundary layer
; evapotranspiration
; forecasting method
; numerical model
; planetary atmosphere
; simulation
; software
; soil moisture
; spatial distribution
; China
; Qinghai-Xizang Plateau
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 Cp and Lvq, surface fluxes (Hsfc and LEsfc), entrainment fluxes (Hent, 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 Hsfc, LEsfc, Hent, and LEent in the study area confirm this result. The spatial distributions of simulated Hsfc, LEsfc, Hent, and LEent, using WRF with Noah and BouLac, suggest that the spatial distributions of Hsfc and LEsfc in the study area are consistent with that of soil moisture, but the spatial distributions of Hent and LEent are quite different from that of soil moisture. A close examination of the relationship between entrainment fluxes and cloud water content (QCloud) reveals that the grids with small Hent and large LEent tend to have high QCloud and Hsfc, suggesting that high Hsfc is conducive to convective cloud formation, which leads to small Hent 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 Hsfc, Hent, 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 Hsfc, LEsfc, Hent, and LEent under different soil moisture conditions reveals that the frequency of Hent ranging from 80 to 240Wm2 and the frequency of LEent ranging from 240 to 90Wm2 both increase as the initial soil moisture increases. Coupled with the changes in QCloud, the changes in Hent 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 QCloud. © 2020 Copernicus GmbH. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162522
Appears in Collections: 气候变化与战略
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作者单位: Sun, G., School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou, China, Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou, China, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China; Hu, Z., Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China; Ma, Y., Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China, CAS Center for Excellence and Innovation in Tibetan Plateau Earth System Sciences, Beijing, China; Xie, Z., Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China; Wang, J., Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China; Yang, S., School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou, China, Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou, China, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China
Recommended Citation:
Sun G.,Hu Z.,Ma Y.,et al. Simulation analysis of local land atmosphere coupling in rainy season over a typical underlying surface in the Tibetan Plateau[J]. Hydrology and Earth System Sciences,2020-01-01,24(12)