Study of the Physical Processes of an Advection Fog Boundary Layer

A large quantity of advection fog appeared in the Yangtze River delta region between 1 and 2 December 2009. Here, we detail the fog formation and dissipation processes and the background weather conditions. The fog boundary layer and its formation and dissipation mechanisms have also been analyzed u...

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Bibliographic Details
Published inBoundary-layer meteorology Vol. 158; no. 1; pp. 125 - 138
Main Authors Liu, Duan Yang, Yan, Wen Lian, Yang, Jun, Pu, Mei Juan, Niu, Sheng Jie, Li, Zi Hua
Format Journal Article
LanguageEnglish
Published Dordrecht Springer Netherlands 01.01.2016
Springer
Springer Nature B.V
Subjects
Advection
Analysis
Atmospheric Protection/Air Quality Control/Air Pollution
Atmospheric Sciences
Boundary layer
Boundary layers
Earth and Environmental Science
Earth Sciences
Fog
Humidity
Meteorology
Notes and Comments
Studies
Temperature
Weather
Yangtze River
Yangtze River Delta
Advection fog
Fog boundary layer
Yangtze River delta
Warm and humid advection
Cold advection
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Summary:A large quantity of advection fog appeared in the Yangtze River delta region between 1 and 2 December 2009. Here, we detail the fog formation and dissipation processes and the background weather conditions. The fog boundary layer and its formation and dissipation mechanisms have also been analyzed using field data recorded in a northern suburb of Nanjing. The results showed the following: (1) This advection fog was generated by interaction between advection of a north-east cold ground layer and a south-east warm upper layer. The double-inversion structure generated by this interaction between the cold and warm advections and steady south-east vapour transport was the main cause of this long-lasting fog. The double-inversion structure provided good thermal conditions for the thick fog, and the south-east vapour transport was not only conducive to maintaining the thickness of the fog but also sustained its long duration. (2) The fog-top altitude was over 600 m for most of the time, and the fog reduced visibility to less than 100 m for approximately 12 h. (3) The low-level jet near the lower inversion layer also played a role in maintaining the thick fog system by promoting heat, momentum and south-east vapour transport.
Bibliography:http://dx.doi.org/10.1007/s10546-015-0076-y
ISSN:0006-8314
1573-1472
DOI:10.1007/s10546-015-0076-y