DOI: 10.1016/j.atmosres.2018.08.001
Scopus记录号: 2-s2.0-85051115372
论文题名: The interaction of the downslope winds and fog formation over the Zagreb area
作者: Telišman Prtenjak M. ; Klaić M. ; Jeričević A. ; Cuxart J.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 214 起始页码: 213
结束页码: 227
语种: 英语
英文关键词: Fog
; Horizontal visibility
; Katabatic flow
; Urban area
; WRF
Scopus关键词: Air quality
; Airports
; Atmospheric temperature
; Climatology
; Numerical models
; Rivers
; Sea level
; Visibility
; Air quality measurements
; Climatological data
; High-resolution numerical models
; Horizontal visibility
; Katabatic flow
; Maximum wind speed
; Temperature inversions
; Urban areas
; Fog
; air quality
; computer simulation
; fog
; katabatic flow
; numerical model
; urban area
; visibility
; wind forcing
; Croatia
; Sava River
; Zagreb
英文摘要: This study investigates fog development over the greater Zagreb area; a long-lasting fog event that took place from 6 to 8 November 2013. According to climatological data, haze and fog occur frequently over the Zagreb airport area and cause severe low visibility that can last for several days. The Zagreb airport is located on a flat terrain south of Zagreb near the Sava River. North of Zagreb, Medvednica Mountain rises up to 1000 m above sea level over a relatively short distance of approximately 10 km, with a very well-defined downslope forest area. The here selected case was analyzed by means of available meteorological and air quality measurements and numerical simulations performed by the WRF-ARW high-resolution numerical model. The model was able to reproduce this fog event with some differences among the various model setups. The influence of the Sava River was also estimated by the additional calculation of backward/forward trajectories. The results revealed the roles of (i) downslope wind, which usually occurred over the city when the net radiation over the Medvednica slopes became negative, and (ii) the urban Zagreb area. Maximum wind speeds occurred at a height of approximately 300 m above ground level, which was slightly above the temperature inversion at the intersection between the slopes and the city. When the downslope flow experienced a hydraulic jump at the lower part of the slope, the downslope flow did not progress significantly over the Sava River or to the south. Then the fog is shallow and dense, staying away from the city. Under certain conditions, the extent of the katabatic flow can reach the airport area. Then the effect of the downslope flow was not apparent in the surface layer over the airport; however it existed above the thermal inversion layer, which contributed to fog persistence. The possible influences of the Sava River and urban heat island (UHI) on fog were relatively small. The largest river effect is most likely at stations that are located northeast of the river. The UHI can contribute to the formation of katabatic winds under clear-sky conditions in the afternoon/early evening. Still during temperature inversion conditions with fog, the UHI can affect the magnitude of the temperature inversion by reducing it. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108740
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Andrija Mohorovičić Geophysical Institute, Department of Geophysics, Faculty of Science, University of Zagreb, Zagreb, Croatia; Croatian Civil Aviation Agency, Zagreb, Croatia; University of the Balearic Islands, Palma de Mallorca, Spain
Recommended Citation:
Telišman Prtenjak M.,Klaić M.,Jeričević A.,et al. The interaction of the downslope winds and fog formation over the Zagreb area[J]. Atmospheric Research,2018-01-01,214