气候变化领域集成服务门户(CCPortal): Extreme Aerosol Events Over Eastern North America: Part 2. Responses to Changing Emissions

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DOI	10.1029/2020JD033759
	Extreme Aerosol Events Over Eastern North America: Part 2. Responses to Changing Emissions
	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	The Weather Research and Forecasting model with coupled Chemistry is used to study the impact of anthropogenic emission changes between 2005 and 2015 on historical extreme aerosol optical depth (AOD) events that occurred during 2003–2007 over the eastern USA. An ensemble of simulations is generated where individual and all combined emissions of SO2, NOx, and NH3 are perturbed relative to the 2005 levels for three subregions (Midwest, Northeast, and Southeast). These simulations are used to quantify fractional changes in the spatial and temporal characteristics of mean and peak AOD and near-surface particulate matter (PM2.5), as well as changes in radiative forcing. Simulated AOD exhibits a spatially averaged decrease of 39%–63% during the six extreme events in response to the combined perturbed emissions. The impact on near-surface PM2.5 concentrations is larger, with average decreases of ∼41%–69%. Peak AOD is reduced to below 1 in the perturbed simulations from initial values of 1.73–3.02 in the control runs driven by 2005 emissions. Radiative fluxes at the ground and top-of-the-atmosphere exhibit considerably smaller and less consistent fractional changes across events, although changes in radiative fluxes during these extreme events are found to be larger than previously reported changes in seasonal mean values over the period 2005 to 2015. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	aerosol; emission change; PM2.5
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/185191
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: Part 2. Responses to Changing Emissions[J],2021,126(10).
APA	Guo Y.,Crippa P.,Thota A.,&Pryor S.C..(2021).Extreme Aerosol Events Over Eastern North America: Part 2. Responses to Changing Emissions.Journal of Geophysical Research: Atmospheres,126(10).
MLA	Guo Y.,et al."Extreme Aerosol Events Over Eastern North America: Part 2. Responses to Changing Emissions".Journal of Geophysical Research: Atmospheres 126.10(2021).