气候变化领域集成服务门户(CCPortal): Ice-nucleating particle versus ice crystal number concentrationin altocumulus and cirrus layers embedded in Saharan dust:a closure study

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DOI	10.5194/acp-19-15087-2019
	Ice-nucleating particle versus ice crystal number concentrationin altocumulus and cirrus layers embedded in Saharan dust:a closure study
	Ansmann A.; Mamouri R.-E.; Bühl J.; Seifert P.; Engelmann R.; Hofer J.; Nisantzi A.; Atkinson J.D.; Kanji Z.A.; Sierau B.; Vrekoussis M.; Sciare J.
发表日期	2019
ISSN	16807316
起始页码	15087
结束页码	15115
卷号	19 期号:23
英文摘要	For the first time, a closure study of the relationship between the ice-nucleating particle concentration (INP; INPC) and ice crystal number concentration (ICNC) in altocumulus and cirrus layers, solely based on groundbased active remote sensing, is presented. Such aerosol- cloud closure experiments are required (a) to better understand aerosol-cloud interaction in the case of mixed-phase clouds, (b) to explore to what extent heterogeneous ice nucleation can contribute to cirrus formation, which is usually controlled by homogeneous freezing, and (c) to check the usefulness of available INPC parameterization schemes, applied to lidar profiles of aerosol optical and microphysical properties up to the tropopause level. The INPC-ICNC closure studies were conducted in Cyprus (Limassol and Nicosia) during a 6-week field campaign in March-April 2015 and during the 17-month CyCARE (Cyprus Clouds Aerosol and Rain Experiment) campaign. The focus was on altocumulus and cirrus layers which developed in pronounced Saharan dust layers at heights from 5 to 11 km. As a highlight, a long-lasting cirrus event was studied which was linked to the development of a very strong dust-infused baroclinic storm (DIBS) over Algeria. The DIBS was associated with strong convective cloud development and lifted large amounts of Saharan dust into the upper troposphere, where the dust influenced the evolution of an unusually large anvil cirrus shield and the subsequent transformation into an cirrus uncinus cloud system extending from the eastern Mediterranean to central Asia, and thus over more than 3500 km. Cloud top temperatures of the three discussed closure study cases ranged from - 20 to -57 °C. The INPC was estimated from polarization/Raman lidar observations in combination with published INPC parameterization schemes, whereas the ICNC was retrieved from combined Doppler lidar, aerosol lidar, and cloud radar observations of the terminal velocity of falling ice crystals, radar reflectivity, and lidar backscatter in combination with the modeling of backscattering at the 532 and 8.5 mm wavelengths. A good-to-acceptable agreement between INPC (observed before and after the occurrence of the cloud layer under investigation) and ICNC values was found in the discussed three proof-of-concept closure experiments. In these case studies, INPC and ICNC values matched within an order of magnitude (i.e., within the uncertainty ranges of the INPC and ICNC estimates), and they ranged from 0.1 to 10 L-1 in the altocumulus layers and 1 to 50 L-1 in the cirrus layers observed between 8 and 11 km height. The successful closure experiments corroborate the important role of heterogeneous ice nucleation in atmospheric ice formation processes when mineral dust is present. The observed longlasting cirrus event could be fully explained by the presence of dust, i.e., without the need for homogeneous ice nucleation processes. © 2019 Author(s).
语种	英语
scopus关键词	cirrus; cloud microphysics; concentration (composition); cumulus; dust; ice cover; ice crystal; nucleation; Sahara
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/143978
作者单位	Leibniz Institute for Tropospheric Research, Leipzig, Germany; Eratosthenes Research Centre, Department of Civil Engineering and Geomatics, Cyprus University of Technology, Limassol, Cyprus; Institute for Atmospheric and Climate Science, ETH Zürich, Zurich, Switzerland; Energy Environment and Water Research Center, Cyprus Institute, Nicosia, Cyprus; Institute of Environmental Physics, University of Bremen, Bremen, Germany; Center for Marine Environmental Sciences (MARUM), University of Bremen, Bremen, Germany; Ethical Power, Exeter, United Kingdom; Notime, Zurich, Switzerland
推荐引用方式 GB/T 7714	Ansmann A.,Mamouri R.-E.,Bühl J.,et al. Ice-nucleating particle versus ice crystal number concentrationin altocumulus and cirrus layers embedded in Saharan dust:a closure study[J],2019,19(23).
APA	Ansmann A..,Mamouri R.-E..,Bühl J..,Seifert P..,Engelmann R..,...&Sciare J..(2019).Ice-nucleating particle versus ice crystal number concentrationin altocumulus and cirrus layers embedded in Saharan dust:a closure study.Atmospheric Chemistry and Physics,19(23).
MLA	Ansmann A.,et al."Ice-nucleating particle versus ice crystal number concentrationin altocumulus and cirrus layers embedded in Saharan dust:a closure study".Atmospheric Chemistry and Physics 19.23(2019).