气候变化领域集成服务门户(CCPortal): Trans-Pacific transport and evolution of aerosols: Spatiotemporal characteristics and source contributions

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DOI	10.5194/acp-19-12709-2019
	Trans-Pacific transport and evolution of aerosols: Spatiotemporal characteristics and source contributions
	Hu Z.; Huang J.; Zhao C.; Ma Y.; Jin Q.; Qian Y.; Ruby Leung L.; Bi J.; Ma J.
发表日期	2019
ISSN	16807316
起始页码	12709
结束页码	12730
卷号	19 期号:19
英文摘要	Aerosols in the middle and upper troposphere have a long enough lifetime for trans-Pacific transport from East Asia to North America to influence air quality on the west coast of the United States (US). Here, we conduct quasi-global simulations (180° W-180° E and 70° S-75° N) from 2010 to 2014 using an updated version of WRF-Chem (Weather Research and Forecasting model fully coupled with chemistry) to analyze the spatiotemporal characteristics and source contributions of trans-Pacific aerosol transport. We find that trans-Pacific total aerosols have a maximum mass concentration (about 15 μg m-3) in the boreal spring with a peak between 3 and 4 km above the surface around 40 N. Sea salt and dust dominate the total aerosol mass concentration below 1 km and above 4 km, respectively. About 80.8 Tg of total aerosols (48.7 Tg of dust) are exported annually from East Asia, of which 26.7 Tg of aerosols (13.4 Tg of dust) reach the west coast of the US. Dust contributions from four desert regions in the Northern Hemisphere are analyzed using a tracer-tagging technique. About 4.9, 3.9, and 4.5 Tg year-1 of dust aerosol emitted from north Africa, the Middle East and central Asia, and East Asia, respectively, can be transported to the west coast of the US. The trans-Pacific aerosols dominate the column-integrated aerosol mass ( 65.5 %) and number concentration ( 80 %) over western North America. Radiation budget analysis shows that the inflow aerosols could contribute about 86.4 % (-2.91 W m-2) at the surface, 85.5 % (+1.36 W m-2) in the atmosphere, and 87.1 % (-1.55 W m-2) at the top of atmosphere to total aerosol radiative effect over western North America. However, near the surface in central and eastern North America, aerosols are mainly derived from local emissions, and the radiative effect of imported aerosols decreases rapidly. This study motivates further investigations of the potential impacts of trans-Pacific aerosols from East Asia on regional air quality and the hydrological cycle in North America. © 2019 Author(s).
语种	英语
scopus关键词	aerosol; aerosol composition; air quality; dust; Northern Hemisphere; sea salt; spatiotemporal analysis; troposphere; Central Asia; Far East; North Africa; United States
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/144100
作者单位	Key Laboratory for Semi-Arid Climate Change, Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, China; School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, China; Key Laboratory of Land-surface Process and Climate Change in Cold and Arid Regions, Northwest Institute of Eco-environment and Resources, Chinese Academy of Science, Lanzhou, China; Department of Geography and Atmospheric Science, University of Kansas, Lawrence, KS, United States; Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, WA, United States
推荐引用方式 GB/T 7714	Hu Z.,Huang J.,Zhao C.,et al. Trans-Pacific transport and evolution of aerosols: Spatiotemporal characteristics and source contributions[J],2019,19(19).
APA	Hu Z..,Huang J..,Zhao C..,Ma Y..,Jin Q..,...&Ma J..(2019).Trans-Pacific transport and evolution of aerosols: Spatiotemporal characteristics and source contributions.Atmospheric Chemistry and Physics,19(19).
MLA	Hu Z.,et al."Trans-Pacific transport and evolution of aerosols: Spatiotemporal characteristics and source contributions".Atmospheric Chemistry and Physics 19.19(2019).