Havala O T Pye, Lu Xu, Barron H Henderson, Demetrios Pagonis, Pedro Campuzano-Jost, Hongyu Guo, Jose L Jimenez, Christine Allen, T Nash Skipper, Hannah S Halliday, Benjamin N Murphy, Emma L D'Ambro, Paul O Wennberg, Bryan K Place, Forwood C Wiser, V Faye McNeill, Eric C Apel, Donald R Blake, Matthew M Coggon, John D Crounse, Jessica B Gilman, Georgios I Gkatzelis, Thomas F Hanisco, L Gregory Huey, Joseph M Katich, Aaron Lamplugh, Jakob Lindaas, Jeff Peischl, Jason M St Clair, Carsten Warneke, Glenn M Wolfe, Caroline Womack
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引用次数: 0
Abstract
Wildfires are an increasing source of emissions into the air, with health effects modulated by the abundance and toxicity of individual species. In this work, we estimate reactive organic compounds (ROC) in western U.S. wildland forest fire smoke using a combination of observations from the 2019 Fire Influence on Regional to Global Environments and Air Quality (FIREX-AQ) field campaign and predictions from the Community Multiscale Air Quality (CMAQ) model. Standard emission inventory methods capture 40-45% of the estimated ROC mass emitted, with estimates of primary organic aerosol particularly low (5-8×). Downwind, gas-phase species abundances in molar units reflect the production of fragmentation products such as formaldehyde and methanol. Mass-based units emphasize larger compounds, which tend to be unidentified at an individual species level, are less volatile, and are typically not measured in the gas phase. Fire emissions are estimated to total 1250 ± 60 g·C of ROC per kg·C of CO, implying as much carbon is emitted as ROC as is emitted as CO. Particulate ROC has the potential to dominate the cancer and noncancer risk of long-term exposure to inhaled smoke, and better constraining these estimates will require information on the toxicity of particulate ROC from forest fires.
期刊介绍:
Environmental Science & Technology (ES&T) is a co-sponsored academic and technical magazine by the Hubei Provincial Environmental Protection Bureau and the Hubei Provincial Academy of Environmental Sciences.
Environmental Science & Technology (ES&T) holds the status of Chinese core journals, scientific papers source journals of China, Chinese Science Citation Database source journals, and Chinese Academic Journal Comprehensive Evaluation Database source journals. This publication focuses on the academic field of environmental protection, featuring articles related to environmental protection and technical advancements.