Open AccessJournal Article
Jump Features and Causes of Macro and Microphysical Structures of a Winter Fog in Nanjing
TLDR
In this paper, a comprehensive fog experiment was carried out in the north suburb of Nanjing, China with many instruments, e.g., tethered balloon system, fog droplet spectrometer, and visibility meter.Abstract:
A comprehensive fog experiment was carried out in the north suburb of Nanjing,China with many instruments,e.g.,tethered balloon system,fog droplet spectrometer,visibility meter.Using the data of boundary layer profiles,fog droplet spectra,visibility,and NCEP reanalysis,a fog case on 14 December 2006 was chosen to study the jump features(sharp strengthening and weakening)of the fog top and the ground fog's density,and their causes are also discussed in detail.Result shows that the explosive development of the fog top is due to upward turbulent transport of moisture and its accumulation under upper-layer inversion as well as substantial temperature decrease;the sharp strengthening of the ground fog is mainly caused by lower saturation vapor pressure in the near-surface layer under the influence of cold advection,enhancement of inversion owing to upper-layer systematic sinking motion,and moisture accumulation under inversion;during the fog top decline,turbulence happens near the fog top and upper-layer sinking motion causes the occurrence of temperature increase,fog double layer structure,and low-level jet;the sharp weakening of the ground fog is the result of solar radiation and downward transport of momentum;sinking motion has dual roles in the fog event;the fog double layer structure occurs during the sharp decline of the fog top and accelerates the fog top decline,which is extremely different from the previous results that the double layer structure causes the fog top development.read more
Citations
More filters
Journal ArticleDOI
The relationship between anticyclonic anomalies in northeastern Asia and severe haze in the Beijing–Tianjin–Hebei region
TL;DR: In this paper, the authors examined the impacts of AANA on severe haze over the Beijing-Tianjin-Hebei (BTH) region during 2014-2016 and found that local meteorological conditions were conducive to severe haze, such as weaker surface winds, a stronger temperature inversion, a shallower boundary layer, and higher relative humidity.
Journal ArticleDOI
Summary of a 4-Year Fog Field Study in Northern Nanjing, Part 1: Fog Boundary Layer
TL;DR: In this paper, the macro and micro-physical structures and the physical-chemical processes of dense fogs in the area were studied, including features of the fog boundary layer, characteristics of fog water, the particle spectrum, the chemical composition of atmospheric aerosols, radiation and heat components, turbulence, meteorological elements (air temperature, pressure, wind speed, wind direction), and environmental monitoring.
Journal ArticleDOI
Summary of a 4-Year Fog Field Study in Northern Nanjing, Part 2: Fog Microphysics
TL;DR: In this article, microphysical characteristics and droplet spectrum distributions of different types of fog, microphysical relationships (among fog droplet concentration, liquid water content, and mean diameter), and microphysics of atmospheric aerosols during haze/fog events are discussed.
Journal ArticleDOI
Examination of microphysical relationships and corresponding microphysical processes in warm fogs
TL;DR: In this article, the microphysical relationships of 8 dense fog events collected from a comprehensive fog observation campaign carried out at Pancheng (32.2°N, 118.7°E) in the Nanjing area, China in the winter of 2007 are investigated.
Journal ArticleDOI
Dense fog burst reinforcement over Eastern China: A review
TL;DR: In this article, a review summarizes the research results of dense fog in China, including the burst reinforcement features of strong dense fog formation, the microphysical process of the fog body enhancement, the causes of burst reinforcement and the characteristics of the boundary layer structure.