Comprehensive analyses of source sensitivities to and apportionments of PM<sub>2.5</sub> and ozone over Japan via multiple numerical techniques

doi:10.5194/acp-2020-236

GSTDTAP > 地球科学

DOI	10.5194/acp-2020-236
	Comprehensive analyses of source sensitivities to and apportionments of PM_2.5 and ozone over Japan via multiple numerical techniques
	Satoru Chatani, Hikari Shimadera, Syuichi Itahashi, and Kazuyo Yamaji
	2020-04-20
发表期刊	Atmospheric Chemistry and Physics
出版年	2020
英文摘要	Source sensitivity and source apportionment are two major indicators representing source-receptor relationships, which serve as essential information when considering effective strategies to accomplish improved air quality. This study evaluated source sensitivities to and apportionments of ambient ozone and PM_2.5 concentrations over Japan with multiple numerical techniques embedded in regional chemical transport models, including a brute forth method (BFM), a high-order decoupled direct method (HDDM), and an integrated source apportionment method (ISAM), to update the source-receptor relationships considering stringent emission controls recently implemented in Japan and surrounding countries. We also attempted to understand the differences among source sensitivities and apportionments calculated by multiple techniques. While domestic sources had certain source apportionments to ozone concentrations, transport from outside Japan dominated the source sensitivities. Although the PM_2.5 concentrations and absolute magnitudes of their source sensitivities were significantly lower than those reported by previous studies, transport from outside Japan still has relatively large contributions to PM_2.5 concentrations, implying that there has been a reduction in Japanese emissions, similar to surrounding countries including China, due to implementation of stringent emission controls. HDDM allowed us to effectively understand the importance of the nonlinear responses of PM_2.5 concentrations to precursor emissions. Apportionments derived by ISAM were useful in distinguishing various direct and indirect influences on ozone and PM_2.5 concentrations. It was suggested that that ozone transported from outside Japan plays a key role in exerting various indirect influences on the formation of ozone and secondary PM_2.5 components. This study demonstrated that a combination of sensitivities and apportionments derived by the BFM, HDDM, and ISAM can provide critical information to identify key emission sources and processes in the atmosphere, which are vital for the development of effective strategies for improved air quality.
领域	地球科学
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/248987
专题	地球科学
推荐引用方式 GB/T 7714	Satoru Chatani, Hikari Shimadera, Syuichi Itahashi, and Kazuyo Yamaji. Comprehensive analyses of source sensitivities to and apportionments of PM_2.5 and ozone over Japan via multiple numerical techniques[J]. Atmospheric Chemistry and Physics,2020.
APA	Satoru Chatani, Hikari Shimadera, Syuichi Itahashi, and Kazuyo Yamaji.(2020).Comprehensive analyses of source sensitivities to and apportionments of PM_2.5 and ozone over Japan via multiple numerical techniques.Atmospheric Chemistry and Physics.
MLA	Satoru Chatani, Hikari Shimadera, Syuichi Itahashi, and Kazuyo Yamaji."Comprehensive analyses of source sensitivities to and apportionments of PM_2.5 and ozone over Japan via multiple numerical techniques".Atmospheric Chemistry and Physics (2020).