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Up and down: Bidirectional fluxes of fog droplets at two subtropical mountain forest sites
Breuer, Bettina; Klemm, Otto; Lai, Yen-Jen; Lin, Po-Hsiung; Meyer, Heta3; Nieberding, Felix4; Song, Qing-Hai
2021
Source PublicationJOURNAL OF HYDROLOGY
ISSN0022-1694
Volume601Issue:xPages:-
Abstract

Bidirectional fog droplet fluxes were observed at two mountainous subtropical forests in East Asia. To investigate the various boundary conditions and that cause these bidirectional droplet fluxes, we set up identical eddy covariance systems including a droplet spectrometer (FM100 Fog monitor) at two study sites in the Ailaoshan (SW China) and Xitou (central Taiwan) areas for several weeks in winter 2015/2016 and spring 2017, respectively. Normally, fog droplets are expected to have a downward flux toward the surface for all sizes due to impaction at the vegetation's surface. However, we also observed temporally positive fluxes, for fog droplets up to a diameter of 10 mu m. Two different cases of bidirectional fog droplet fluxes were identified in our experiments: At Xitou, the positive droplet number fluxes for smaller droplets occurred together with a positive sensible heat flux in combination with large critical diameters according to the Kohler theory. At Ailaoshan, similar fluxes occurred yet together with negative sensible heat fluxes in combination with small critical diameters. We analyze the occurrence of these bidirectional droplet number fluxes in conjunction with the boundary layer conditions and the activation state of the droplets with diameters up to 10 mu m. Plausible reasons for the identical flux directions at the two sites under very different microphysical fog conditions are presented.

KeywordFog droplet fluxes East Asia Eddy covariance Bidirectional fluxes
Subject AreaEngineering ; Geology ; Water Resources
DOI10.1016/j.jhydrol.2021.126491
Indexed BySCI
Language英语
WOS IDWOS:000695816300001
Citation statistics
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/12389
Collection全球变化研究组
Affiliation1.Univ Munster, Climatol Res Grp, Heisenbergstr 2, D-48149 Munster, Germany
2.Natl Taiwan Univ, Expt Forest, Chien Shan Rd 12, Nantou, Taiwan
3.Natl Taiwan Univ, Dept Atmospher Sci, Taipei 10617, Taiwan
4.Hsch Weihenstephan Triesdorf, Vegetat Ecol, Hofgarten 1, D-85354 Freising Weihenstephan, Germany
5.Tech Univ Carolo Wilhelmina Braunschweig, Inst Geosyst & Bioindicat, Langer Kamp 19c, D-38106 Braunschweig, Germany
6.Chinese Acad Sci, Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Menglun 666303, Yunnan, Peoples R China
Recommended Citation
GB/T 7714
Breuer, Bettina,Klemm, Otto,Lai, Yen-Jen,et al. Up and down: Bidirectional fluxes of fog droplets at two subtropical mountain forest sites[J]. JOURNAL OF HYDROLOGY,2021,601(x):-.
APA Breuer, Bettina.,Klemm, Otto.,Lai, Yen-Jen.,Lin, Po-Hsiung.,Meyer, Heta.,...&Song, Qing-Hai.(2021).Up and down: Bidirectional fluxes of fog droplets at two subtropical mountain forest sites.JOURNAL OF HYDROLOGY,601(x),-.
MLA Breuer, Bettina,et al."Up and down: Bidirectional fluxes of fog droplets at two subtropical mountain forest sites".JOURNAL OF HYDROLOGY 601.x(2021):-.
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