The relation between humidity and liquid water content in fog: An experimental approach

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Title:	The relation between humidity and liquid water content in fog: An experimental approach
Authors:	柯奧圖;Gonser, Stefan Georg;Klemm, Otto;Griessbaum, Frank;Chang, Shih-Chieh;Chu, Hou-Sen;Hsia, Yue-Joe
Contributors:	地球科學學院大氣科學學系
Keywords:	Absolute humidity;Air temperature;Applied geophysics;Cloud forests;Clouds;Coalescence;Condensing;Droplets;Earth and Environmental Science;Earth Sciences;Earth, ocean, space;Engineering and environment geology. Geothermics;Exact sciences and technology;Fog;Geophysics;Geophysics/Geodesy;Humidity;Internal geophysics;Liquids;Mountains;Natural hazards: prediction, damages, etc;Physics;Relative humidity;Statistical analysis;Water;Water content;Wind speed
Date:	2012-05-01
Issue Date:	2026-04-21 13:35:38 (UTC+8)
Publisher:	Birkhauser Verlag Basel;Basel: SP Birkh�user Verlag Basel
Abstract:	摘要： Microphysical measurements of orographic fog were performed above a montane cloud forest in northeastern Taiwan (Chilan mountain site). The measured parameters include droplet size distribution (DSD), absolute humidity (AH), relative humidity (RH), air temperature, wind speed and direction, visibility, and solar short wave radiation. The scope of this work was to study the short term variations of DSD, temperature, and RH, with a temporal resolution of 3 Hz. The results show that orographic fog is randomly composed of various air volumes that are intrinsically rather homogeneous, but exhibit clear differences between each other with respect to their size, RH, LWC, and DSD. Three general types of air volumes have been identified via the recorded DSD. A statistical analysis of the characteristics of these volumes yielded large variabilities in persistence, RH, and LWC. Further, the data revealed an inverse relation between RH and LWC. In principle, this finding can be explained by the condensational growth theory for droplets containing soluble or insoluble material. Droplets with greater diameters can exist at lower ambient RH than smaller ones. However, condensational growth alone is not capable to explain the large observed differences in DSD and RH because the respective growth speeds are too slow to explain the observed phenomena. Other mechanisms play key roles as well. Possible processes leading to the large observed differences in RH and DSD include turbulence induced collision and coalescence, and heterogeneous mixing. More analyses including fog droplet chemistry and dynamic microphysical modeling are required to further study these processes. To our knowledge, this is the first experimental field observation of the anti-correlation between RH and LWC in fog. 其他題名： Pure Appl. Geophys 出版者： Basel: SP Birkhäuser Verlag Basel 出版日期： 2012-05-01 出處： Pure and applied geophysics, 2012-05, Vol.169 (5-6), p.821-833 資源來源： Springer Nature Link 版權： Springer Basel AG 2011 版權： 2015 INIST-CNRS 版權： Springer Basel AG 2012 識別號： ISSN: 0033-4553 識別號： EISSN: 1420-9136 識別號： DOI: 10.1007/s00024-011-0270-x 識別號： CODEN: PAGYAV
Appears in Collections:	[Department of Atmospheric Sciences] journal & Dissertation

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