气候变化领域集成服务门户(CCPortal): Impacts of Urbanization, Aerodynamic Roughness, and Land Surface Processes on the Extreme Heavy Rainfall Over Chennai, India

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DOI	10.1029/2020JD034017
	Impacts of Urbanization, Aerodynamic Roughness, and Land Surface Processes on the Extreme Heavy Rainfall Over Chennai, India
	Rajeswari J.R.; Srinivas C.V.; Yesubabu V.; Hari Prasad D.; Venkatraman B.
发表日期	2021
ISSN	2169897X
卷号	126 期号:10
英文摘要	In this study, the impacts of urban land surface processes on the extreme heavy rainfall event on December 01, 2015 over Chennai, located in north coastal Tamil Nadu, India are analyzed using convection permitting WRF simulations. A series of numerical experiments are conducted using different land cover data (USGS-1992, NRSC-2004, NRSC-2015), aerodynamic roughness, and land surface models (LSM) to assess their sensitivity on the predicted rainfall. Results suggest that experiments with NRSC-2015 with increased urban extent improved the rainfall prediction in terms of rainfall intensity and its distribution. Though temperatures, sensible heat, and planetary boundary layer height (PBLH) increased due to urbanization in both dry and wet phases, the humidity and convective available potential energy (CAPE) reduced during the dry phase suggesting thermal convection played a secondary role in rainfall. Considerable increase of surface drag, momentum transport, wind shear, and turbulent kinetic energy is found in simulations with updated land use and roughness, which determined the location of the cyclonic circulation, convergence, and maximum precipitation. LSM sensitivity experiments indicated that while the five-layer model substantially increased the sensible heat, temperature, and PBLH, it reduced the moisture convergence and CAPE relative to Noah and Noah-MP thus resulting in low rainfall. The simulation with Noah-MP enhanced the low-level shear and convergence over other LSMs thus produced a wide spread rainfall along the coast. Our results demonstrated that the momentum transport due to urban drag played a vital role by strengthening the low-level convergence and moist convection, which caused heavy precipitation over Chennai. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	heavy rainfall; roughness; shear; surface drag; urbanization; WRF
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185207
作者单位	Environmental Assessment Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamilnadu, India; Homi Bhabha National Institute, Mumbai, India; National Atmospheric Research Laboratory, Gadanki, Andhra Pradesh, India; Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
推荐引用方式 GB/T 7714	Rajeswari J.R.,Srinivas C.V.,Yesubabu V.,et al. Impacts of Urbanization, Aerodynamic Roughness, and Land Surface Processes on the Extreme Heavy Rainfall Over Chennai, India[J],2021,126(10).
APA	Rajeswari J.R.,Srinivas C.V.,Yesubabu V.,Hari Prasad D.,&Venkatraman B..(2021).Impacts of Urbanization, Aerodynamic Roughness, and Land Surface Processes on the Extreme Heavy Rainfall Over Chennai, India.Journal of Geophysical Research: Atmospheres,126(10).
MLA	Rajeswari J.R.,et al."Impacts of Urbanization, Aerodynamic Roughness, and Land Surface Processes on the Extreme Heavy Rainfall Over Chennai, India".Journal of Geophysical Research: Atmospheres 126.10(2021).