气候变化领域集成服务门户(CCPortal): In situ observation of new particle formation (NPF) in the tropical tropopause layer of the 2017 Asian monsoon anticyclone

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DOI	10.5194/acp-21-13455-2021
	In situ observation of new particle formation (NPF) in the tropical tropopause layer of the 2017 Asian monsoon anticyclone - Part 2: NPF inside ice clouds
	Weigel R.; Mahnke C.; Baumgartner M.; Kramer M.; Spichtinger P.; Spelten N.; Afchine A.; Rolf C.; Viciani S.; Damato F.; Tost H.; Borrmann S.
发表日期	2021
ISSN	1680-7316
起始页码	13455
结束页码	13481
卷号	21 期号:17
英文摘要	From 27 July to 10 August 2017, the airborne StratoClim mission took place in Kathmandu, Nepal, where eight mission flights were conducted with the M-55 Geophysica up to altitudes of 20g km. New particle formation (NPF) was identified by the abundant presence of nucleation-mode aerosols, with particle diameters dp smaller than 15g nm, which were in-situ-detected by means of condensation nuclei (CN) counter techniques. NPF fields in clear skies as well as in the presence of cloud ice particles (dpg >g 3g μm) were encountered at upper troposphere-lowermost stratosphere (UTLS) levels and within the Asian monsoon anticyclone (AMA). NPF-generated nucleation-mode particles in elevated concentrations (Nnm) were frequently found together with cloud ice (in number concentrations Nice of up to 3g cm-3) at heights between g 1/4g 11 and 16g km. From a total measurement time of g 1/4g 22.5g h above 10g km altitude, in-cloud NPF was in sum detected over g 1/4g 1.3g h (g 1/4g 50g % of all NPF records throughout StratoClim). Maximum Nnm of up to g 1/4g 11g 000g cm-3 was detected coincidently with intermediate ice particle concentrations Nice of 0.05-0.1g cm-3 at comparatively moderate carbon monoxide (CO) contents of g 1/4g 90-100g nmolg mol-1. Neither under clear-sky nor during in-cloud NPF do the highest Nnm concentrations correlate with the highest CO mixing ratios, suggesting that an elevated pollutant load is not a prerequisite for NPF. Under clear-air conditions, NPF with elevated Nnm (>g 8000g cm-3) occurred slightly less often than within clouds. In the presence of cloud ice, NPF with Nnm between 1500-4000g cm-3 was observed about twice as often as under clear-air conditions. NPF was not found when ice water contents exceeded 1000g μmolg mol-1 in very cold air (
语种	英语
scopus关键词	aerosol formation; anticyclone; carbon monoxide; cloud; cloud condensation nucleus; mixing ratio; monsoon; tropopause; Bagmati; Kathmandu; Nepal
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/246592
作者单位	Institut fur Physik der Atmosphare, Johannes Gutenberg University Mainz, Mainz, Germany; Abteilung Partikelchemie, Max-Planck-Institut fur Chemie, Mainz, Germany; Zentrum fur Datenverarbeitung, Johannes Gutenberg University Mainz, Mainz, Germany; Institute of Energy and Climate Research (IEK-7), Forschungszentrum Julich, Julich, Germany; National Institute of Optics, National Research Council (CNR-INO), Florence, Italy; Institute of Energy and Climate Research (IEK-8), Forschungszentrum Julich, Julich, Germany
推荐引用方式 GB/T 7714	Weigel R.,Mahnke C.,Baumgartner M.,et al. In situ observation of new particle formation (NPF) in the tropical tropopause layer of the 2017 Asian monsoon anticyclone - Part 2: NPF inside ice clouds[J],2021,21(17).
APA	Weigel R..,Mahnke C..,Baumgartner M..,Kramer M..,Spichtinger P..,...&Borrmann S..(2021).In situ observation of new particle formation (NPF) in the tropical tropopause layer of the 2017 Asian monsoon anticyclone - Part 2: NPF inside ice clouds.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(17).
MLA	Weigel R.,et al."In situ observation of new particle formation (NPF) in the tropical tropopause layer of the 2017 Asian monsoon anticyclone - Part 2: NPF inside ice clouds".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.17(2021).