气候变化领域集成服务门户(CCPortal): Lower-stratospheric aerosol measurements in eastward-shedding vortices over Japan from the Asian summer monsoon anticyclone during the summer of 2018

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DOI	10.5194/acp-21-3073-2021
	Lower-stratospheric aerosol measurements in eastward-shedding vortices over Japan from the Asian summer monsoon anticyclone during the summer of 2018
	Fujiwara M.; Sakai T.; Nagai T.; Shiraishi K.; Inai Y.; Khaykin S.; Xi H.; Shibata T.; Shiotani M.; Pan L.L.
发表日期	2021
ISSN	1680-7316
起始页码	3073
结束页码	3090
卷号	21 期号:4
英文摘要	Eastward air-mass transport from the Asian summer monsoon (ASM) anticyclone in the upper troposphere and lower stratosphere (UTLS) often involves eastward-shedding vortices, which can cover most of the Japanese archipelago. We investigated the aerosol characteristics of these vortices by analysing data from two lidar systems in Japan, at Tsukuba (36.1◦ N, 140.1◦ E) and Fukuoka (33.55◦ N, 130.36◦ E), during the summer of 2018. We observed several events with enhanced particle signals at Tsukuba at 15.5-18 km of altitude (at or above the local tropopause) during August-September 2018, with a backscattering ratio of ∼ 1.10 and particle depolarization of ∼ 5 % (i.e. not spherical, but more spherical than ice crystals). These particle characteristics may be consistent with those of solid aerosol particles, such as ammonium nitrate. Each event had a timescale of a few days. During the same study period, we also observed similar enhanced particle signals in the lower stratosphere at Fukuoka. The upper troposphere is often covered by cirrus clouds at both lidar sites. Backward trajectory calculations for these sites for days with enhanced particle signals in the lower stratosphere and days without indicate that the former air masses originated within the ASM anticyclone and the latter more from edge regions. Reanalysis carbon monoxide and satellite water vapour data indicate that eastward-shedding vortices were involved in the observed aerosol enhancements. Satellite aerosol data confirm that the period and latitudinal region were free from the direct influence of documented volcanic eruptions and high-latitude forest fires. Our results indicate that the Asian tropopause aerosol layer (ATAL) over the ASM region extends east towards Japan in association with the eastward-shedding vortices and that lidar systems in Japan can detect at least the lower-stratospheric portion of the ATAL during periods when the lower stratosphere is undisturbed by volcanic eruptions and forest fires. The upper-tropospheric portion of the ATAL is either depleted by tropospheric processes (convection and wet scavenging) during eastward transport or is obscured by much stronger cirrus cloud signals. © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	aerosol; anticyclone; atmospheric transport; lidar; measurement method; monsoon; stratosphere; vortex shedding; Fukuoka [Kyushu]; Honshu; Ibaraki; Japan; Kanto; Kyushu; Tsukuba
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/247107
作者单位	Faculty of Environmental Earth Science, Hokkaido University, Sapporo, 060-0810, Japan; Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, 305-0052, Japan; Faculty of Science, Fukuoka University, Fukuoka, 814-0180, Japan; Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan; LATMOS/IPSL, UVSQ, Sorbonne Université, CNRS, Guyancourt, 78280, France; Graduate School of Environmental Science, Hokkaido University, Sapporo, 060-0810, Japan; Graduate School of Environmental Studies, Nagoya University, Nagoya, 464-8601, Japan; Research Institute for Sustainable Humanosphere, Kyoto University, Uji, 611-0011, Japan; National Center for Atmospheric Research, Boulder, CO 80301, United States; Japan Meteorological Agency, Sapporo, 060-0002, Japan
推荐引用方式 GB/T 7714	Fujiwara M.,Sakai T.,Nagai T.,et al. Lower-stratospheric aerosol measurements in eastward-shedding vortices over Japan from the Asian summer monsoon anticyclone during the summer of 2018[J],2021,21(4).
APA	Fujiwara M..,Sakai T..,Nagai T..,Shiraishi K..,Inai Y..,...&Pan L.L..(2021).Lower-stratospheric aerosol measurements in eastward-shedding vortices over Japan from the Asian summer monsoon anticyclone during the summer of 2018.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(4).
MLA	Fujiwara M.,et al."Lower-stratospheric aerosol measurements in eastward-shedding vortices over Japan from the Asian summer monsoon anticyclone during the summer of 2018".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.4(2021).