气候变化领域集成服务门户(CCPortal): Classification of Arctic multilayer clouds using radiosonde and radar data in Svalbard

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DOI	10.5194/acp-19-5111-2019
	Classification of Arctic multilayer clouds using radiosonde and radar data in Svalbard
	Vassel M.; Ickes L.; Maturilli M.; Hoose C.
发表日期	2019
ISSN	16807316
起始页码	5111
结束页码	5126
卷号	19 期号:7
英文摘要	Multilayer clouds (MLCs) occur more often in the Arctic than globally. In this study we present the results of a detection algorithm applied to radiosonde and radar data from an 1-year time period in Ny-Ålesund, Svalbard. Multilayer cloud occurrence is found on 29% of the investigated days. These multilayer cloud cases are further analysed regarding the possibility of ice crystal seeding, meaning that an ice crystal can survive sublimation in a subsaturated layer between two cloud layers when falling through this layer. For this we analyse profiles of relative humidity with respect to ice to identify super- and subsaturated air layers. Then the sublimation of an ice crystal of an assumed initial size of r = 400 μm on its way through the subsaturated layer is calculated. If the ice crystal still exists when reaching a lower supersaturated layer, ice crystal seeding can potentially take place. Seeding cases are found often, in 23% of the investigated days (100% includes all days, as well as non-cloudy days). The identification of seeding cases is limited by the radar signal inside the subsaturated layer. Clearly separated multilayer clouds, defined by a clear interstice in the radar image, do not interact through seeding (9% of the investigated days). There are various deviations between the relative humidity profiles and the radar images, e.g. due to the lack of ice-nucleating particles (INPs) and cloud condensation nuclei (CCN). Additionally, horizontal wind drift of the radiosonde and time restriction when comparing radiosonde and radar data cause further deviations. In order to account for some of these deviations, an evaluation by manual visual inspection is done for the non-seeding cases. © Author(s) 2019.
语种	英语
scopus关键词	algorithm; cloud classification; cloud condensation nucleus; ice crystal; radar; radiosonde; relative humidity; sublimation; Arctic; Svalbard; Svalbard and Jan Mayen
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/144480
作者单位	Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Karlsruhe, Germany; Department of Meteorology, Stockholm University, Stockholm, Sweden; Alfred Wegener Institute for Polar and Marine Research, Potsdam, Germany
推荐引用方式 GB/T 7714	Vassel M.,Ickes L.,Maturilli M.,et al. Classification of Arctic multilayer clouds using radiosonde and radar data in Svalbard[J],2019,19(7).
APA	Vassel M.,Ickes L.,Maturilli M.,&Hoose C..(2019).Classification of Arctic multilayer clouds using radiosonde and radar data in Svalbard.Atmospheric Chemistry and Physics,19(7).
MLA	Vassel M.,et al."Classification of Arctic multilayer clouds using radiosonde and radar data in Svalbard".Atmospheric Chemistry and Physics 19.7(2019).