气候变化领域集成服务门户(CCPortal): Direct measurements of ozone response to emissions perturbations in California

CCPortal

DOI	10.5194/acp-22-4929-2022
	Direct measurements of ozone response to emissions perturbations in California
	Wu, Shenglun; Lee, Hyung Joo; Anderson, Andrea; Liu, Shang; Kuwayama, Toshihiro; Seinfeld, John H.; Kleeman, Michael J.
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	4929
结束页码	4949
卷号	22 期号:7 页码:21
英文摘要	A new technique was used to directly measure O-3 response to changes in precursor NOx and volatile organic compound (VOC) concentrations in the atmosphere using three identical Teflon smog chambers equipped with UV lights. One chamber served as the baseline measurement for O-3 formation, one chamber added NOx, and one chamber added surrogate VOCs (ethylene, m-xylene, n-hexane). Comparing the O-3 formation between chambers over a 3-hour UV cycle provides a direct measurement of O-3 sensitivity to precursor concentrations. Measurements made with this system at Sacramento, California, between April-December 2020 revealed that the atmospheric chemical regime followed a seasonal cycle. O-3 formation was VOC-limited (NOx-rich) during the early spring, transitioned to NOx-limited during the summer due to increased concentrations of ambient VOCs with high O-3 formation potential, and then returned to VOC-limited (NOx-rich) during the fall season as the concentrations of ambient VOCs decreased and NOx increased. This seasonal pattern of O-3 sensitivity is consistent with the cycle of biogenic emissions in California. The direct chamber O-3 sensitivity measurements matched semi-direct measurements of HCHO/NO2 ratios from the TROPOspheric Monitoring Instrument (TROPOMI) aboard the Sentinel-5 Precursor (Sentinel-5P) satellite. Furthermore, the satellite observations showed that the same seasonal cycle in O-3 sensitivity occurred over most of the entire state of California, with only the urban cores of the very large cities remaining VOC-limited across all seasons. The O-3-nonattainment days (MDA8 O-3 > 70 ppb) have O-3 sensitivity in the NOx-limited regime, suggesting that a NOx emissions control strategy would be most effective at reducing these peak O-3 concentrations. In contrast, a large portion of the days with MDA8 O-3 concentrations below 55 ppb were in the VOC-limited regime, suggesting that an emissions control strategy focusing on NOx reduction would increase O-3 concentrations. This challenging situation suggests that emissions control programs that focus on NOx reductions will immediately lower peak O-3 concentrations but slightly increase intermediate O-3 concentrations until NOx levels fall far enough to re-enter the NOx-limited regime. The spatial pattern of increasing and decreasing O-3 concentrations in response to a NOx emissions control strategy should be carefully mapped in order to fully understand the public health implications.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000782410000001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273155
作者单位	University of California System; University of California Davis; Pohang University of Science & Technology (POSTECH); University of California System; University of California Irvine; California Institute of Technology
推荐引用方式 GB/T 7714	Wu, Shenglun,Lee, Hyung Joo,Anderson, Andrea,et al. Direct measurements of ozone response to emissions perturbations in California[J],2022,22(7):21.
APA	Wu, Shenglun.,Lee, Hyung Joo.,Anderson, Andrea.,Liu, Shang.,Kuwayama, Toshihiro.,...&Kleeman, Michael J..(2022).Direct measurements of ozone response to emissions perturbations in California.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(7),21.
MLA	Wu, Shenglun,et al."Direct measurements of ozone response to emissions perturbations in California".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.7(2022):21.