气候变化领域集成服务门户(CCPortal): Ice fog observed at cirrus temperatures at Dome C, Antarctic Plateau

CCPortal

DOI	10.5194/acp-22-12857-2022
	Ice fog observed at cirrus temperatures at Dome C, Antarctic Plateau
	Vignon, Etienne; Raillard, Lea; Genthon, Christophe; Del Guasta, Massimo; Heymsfield, Andrew J.; Madeleine, Jean-Baptiste; Berne, Alexis
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	12857
结束页码	12872
卷号	22 期号:19 页码:16
英文摘要	As the near-surface atmosphere over the Antarctic Plateau is cold and pristine, its physico-chemical conditions resemble to a certain extent those of the high troposphere where cirrus clouds form. In this paper, we carry out an observational analysis of two shallow fog clouds forming in situ at cirrus temperatures - that is, temperatures lower than 235 K - at Dome C, inner Antarctic Plateau. The combination of lidar profiles with temperature and humidity measurements from advanced thermo-hygrometers along a 45 m mast makes it possible to characterise the formation and development of the fog. High supersaturations with respect to ice are observed before the initiation of fog, and the values attained suggest that the nucleation process at play is the homogeneous freezing of solution aerosol droplets. This is the first time that in situ observations show that this nucleation pathway can be at the origin of an ice fog. Once nucleation occurs, the relative humidity gradually decreases down to subsaturated values with respect to ice in a few hours, owing to vapour deposition onto ice crystals and turbulent mixing. The development of fog is tightly coupled with the dynamics of the boundary layer which, in the first study case, experiences a weak diurnal cycle, while in the second case, it transits from a very stable to a weakly stable dynamical regime. Overall, this paper highlights the potential of the site of Dome C for carrying out observational studies of very cold cloud microphysical processes in natural conditions and using in situ ground-based instruments.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000864201300001
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/273770
作者单位	Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute for Earth Sciences & Astronomy (INSU); UDICE-French Research Universities; Sorbonne Universite; Universite Paris Cite; National Center Atmospheric Research (NCAR) - USA; Swiss Federal Institutes of Technology Domain; Ecole Polytechnique Federale de Lausanne
推荐引用方式 GB/T 7714	Vignon, Etienne,Raillard, Lea,Genthon, Christophe,et al. Ice fog observed at cirrus temperatures at Dome C, Antarctic Plateau[J],2022,22(19):16.
APA	Vignon, Etienne.,Raillard, Lea.,Genthon, Christophe.,Del Guasta, Massimo.,Heymsfield, Andrew J..,...&Berne, Alexis.(2022).Ice fog observed at cirrus temperatures at Dome C, Antarctic Plateau.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(19),16.
MLA	Vignon, Etienne,et al."Ice fog observed at cirrus temperatures at Dome C, Antarctic Plateau".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.19(2022):16.