气候变化领域集成服务门户(CCPortal): An unexpected catalyst dominates formation and radiative forcing of regional haze

CCPortal

DOI	10.1073/pnas.1919343117
	An unexpected catalyst dominates formation and radiative forcing of regional haze
	Zhang F.; Wang Y.; Peng J.; Chen L.; Sun Y.; Duan L.; Ge X.; Li Y.; Zhao J.; Liu C.; Zhang X.; Zhang G.; Pan Y.; Wang Y.; Zhang A.L.; Ji Y.; Wang G.; Hu M.; Molina M.J.; Zhang R.
发表日期	2020
ISSN	0027-8424
起始页码	3960
结束页码	3966
卷号	117 期号:8
英文摘要	Although regional haze adversely affects human health and possibly counteracts global warming from increasing levels of greenhouse gases, the formation and radiative forcing of regional haze on climate remain uncertain. By combining field measurements, laboratory experiments, and model simulations, we show a remarkable role of black carbon (BC) particles in driving the formation and trend of regional haze. Our analysis of long-term measurements in China indicates declined frequency of heavy haze events along with significantly reduced SO2, but negligibly alleviated haze severity. Also, no improving trend exists for moderate haze events. Our complementary laboratory experiments demonstrate that SO2 oxidation is efficiently catalyzed on BC particles in the presence of NO2 and NH3, even at low SO2 and intermediate relative humidity levels. Inclusion of the BC reaction accounts for about 90–100% and 30–50% of the sulfate production during moderate and heavy haze events, respectively. Calculations using a radiative transfer model and accounting for the sulfate formation on BC yield an invariant radiative forcing of nearly zero W m−2 on the top of the atmosphere throughout haze development, indicating small net climatic cooling/warming but large surface cooling, atmospheric heating, and air stagnation. This BC catalytic chemistry facilitates haze development and explains the observed trends of regional haze in China. Our results imply that reduction of SO2 alone is insufficient in mitigating haze occurrence and highlight the necessity of accurate representation of the BC chemical and radiative properties in predicting the formation and assessing the impacts of regional haze. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Air pollution; Black carbon; Climate; Haze; Multiphase chemistry
语种	英语
scopus关键词	ammonia; black carbon; nitrogen oxide; sulfate; sulfur dioxide; Article; catalyst; chemical analysis; chemical reaction; climate change; concentration (parameter); controlled study; environmental impact assessment; environmental management; environmental monitoring; geographic distribution; haze; humidity; oxidation; pollution transport; priority journal; radiative forcing; radioactivity; seasonal variation; trend study
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/161046
作者单位	Zhang, F., College of Global Change and Earth System Science, Beijing Normal University, Beijing, 100875, China, Department of Atmospheric Sciences, Texas A&M University, College Station, TX 77843, United States; Wang, Y., Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, United States; Peng, J., Department of Atmospheric Sciences, Texas A&M University, College Station, TX 77843, United States; Chen, L., College of Global Change and Earth System Science, Beijing Normal University, Beijing, 100875, China; Sun, Y., State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100080, China; Duan, L., Department of Atmospheric Sciences, Texas A&M University, College Station, TX 77843, United States, State Environmental Protection Key Lab of Environmental Risk Assessment and Control on Chemical Processes, East China University of Science and Technology, Shang...
推荐引用方式 GB/T 7714	Zhang F.,Wang Y.,Peng J.,et al. An unexpected catalyst dominates formation and radiative forcing of regional haze[J],2020,117(8).
APA	Zhang F..,Wang Y..,Peng J..,Chen L..,Sun Y..,...&Zhang R..(2020).An unexpected catalyst dominates formation and radiative forcing of regional haze.Proceedings of the National Academy of Sciences of the United States of America,117(8).
MLA	Zhang F.,et al."An unexpected catalyst dominates formation and radiative forcing of regional haze".Proceedings of the National Academy of Sciences of the United States of America 117.8(2020).