气候变化领域集成服务门户(CCPortal): The role of atmospheric forcings and WRF physical set-up on convective initiation over Córdoba, Argentina

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DOI	10.1016/j.atmosres.2020.105335
	The role of atmospheric forcings and WRF physical set-up on convective initiation over Córdoba, Argentina
	Alvarez Imaz M.; Salio P.; Dillon M.E.; Fita L.
发表日期	2021
ISSN	0169-8095
卷号	250
英文摘要	The accurate determination of the location and timing of convective initiation (CI) is a crucial aspect of forecasting and high impact weather warning systems associated with deep convection. Central Argentina, particularly the Sierras de Córdoba (SDC), is characterized by the regular occurrence of deep convective cells that reach supercell characteristics producing large hail and occasionally tornadoes. In order to analyze the sensitivity of the CI over SDC, an ensemble of 12 simulations with the WRF model at convection-permitting resolution (3 km.) was carried out to study a marginal supercell initiated on October 17, 2017 at the SDC foothills. The ensemble was built using 3 different microphysics (MP) parameterizations (WSM6, Thompson and Morrison) and 2 planetary boundary layer (PBL) parameterizations (Yonsei University and Mellor Yamada Janjic). Also, the sensitivity of initial and boundary conditions is considered by forcing the model with 2 different global analyses: the European Centre for Medium-Range Weather Forecast (ECMWF) model, and the Global Data Assimilation System (GDAS). The two different forcing data show low-level moisture differences, which later modulate the life-cycle of the simulated cells. A tracking algorithm was used to capture their life-cycle, and CI was detected at both the hills and the plains. Simulations forced with ECMWF analyses tend to show better results with characteristics closer to the ones observed including: initiation over the eastward slope of SDC, stronger cells and slow propagation. Among all simulations analyzed, the best performance was obtained with the combination of Thompson MP and Yonsei University PBL schemes. © 2020 Elsevier B.V.
英文关键词	Convective initiation; Initial conditions; Predictability; WRF model
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236898
作者单位	Servicio Meteorológico Nacional, Argentina; Departamento Ciencias de la Atmósfera y de los Océanos, FCEN, UBA, Argentina; Centro de Investigaciones del Mar y la Atmósfera, (CIMA/UBA-CONICET), Argentina; Instituto Franco-Argentino sobre Estudios del Clima y sus Impactos (UMI-3351 IFAECI/CNRS-CONICET-UBA), Argentina; CONICET, Argentina
推荐引用方式 GB/T 7714	Alvarez Imaz M.,Salio P.,Dillon M.E.,et al. The role of atmospheric forcings and WRF physical set-up on convective initiation over Córdoba, Argentina[J],2021,250.
APA	Alvarez Imaz M.,Salio P.,Dillon M.E.,&Fita L..(2021).The role of atmospheric forcings and WRF physical set-up on convective initiation over Córdoba, Argentina.Atmospheric Research,250.
MLA	Alvarez Imaz M.,et al."The role of atmospheric forcings and WRF physical set-up on convective initiation over Córdoba, Argentina".Atmospheric Research 250(2021).