气候变化领域集成服务门户(CCPortal): Extreme Aerosol Events Over Eastern North America: 1. Characterizing and Simulating Historical Events

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DOI	10.1029/2020JD033758
	Extreme Aerosol Events Over Eastern North America: 1. Characterizing and Simulating Historical Events
	Guo Y.; Crippa P.; Thota A.; Pryor S.C.
发表日期	2021
ISSN	2169897X
卷号	126 期号:10
英文摘要	Improved characterization of the spatiotemporal extent, intensity, and causes of extreme aerosol optical depth events is critical to quantifying their regional climate forcing and the link to near-surface air quality. An analysis of regional-scale extreme aerosol events over the eastern United States is undertaken using output from the Modern-Era Retrospective analysis for Research and Applications, version 2 (MERRA-2) reanalysis and observations from the MODerate resolution Imaging Spectroradiometers (MODIS). Six extreme aerosol optical depth (AOD) events during 2003–2007, dominated by anthropogenic emissions and characterized by a regional scale extent, are identified and simulated using the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) applied at 12 km resolution. Statistical analyses show output from WRF-Chem during these events is generally negatively biased in terms of the mean AOD and PM2.5, but WRF-Chem exhibits skill in capturing the peak AOD. WRF-Chem also exhibits fidelity in reproducing the spatiotemporal characteristics of the extreme AOD events in intensity, location of centroid, propagation, duration, and their spatial extension. Considerable event-to-event variability in model skill in simulating spatial patterns of extreme events is observed, with the highest spatial correlation with MERRA-2 AOD noted for events centered in the Midwest. Mean fractional bias in modeled peak AOD is minimized for the most intense events and for events centered over the southeastern USA. WRF-Chem output is also negatively biased in downwelling shortwave radiation at the ground and specific humidity consistent with a positive bias in simulated precipitation relative to MERRA-2. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	aerosol optical depth; extreme events; WRF-Chem
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/185202
作者单位	Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, United States; Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, South Bend, IN, United States; Pervasive Technology Institute, Indiana University, Bloomington, IN, United States
推荐引用方式 GB/T 7714	Guo Y.,Crippa P.,Thota A.,et al. Extreme Aerosol Events Over Eastern North America: 1. Characterizing and Simulating Historical Events[J],2021,126(10).
APA	Guo Y.,Crippa P.,Thota A.,&Pryor S.C..(2021).Extreme Aerosol Events Over Eastern North America: 1. Characterizing and Simulating Historical Events.Journal of Geophysical Research: Atmospheres,126(10).
MLA	Guo Y.,et al."Extreme Aerosol Events Over Eastern North America: 1. Characterizing and Simulating Historical Events".Journal of Geophysical Research: Atmospheres 126.10(2021).