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Volume 28 Issue 1

Jan.  2011

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Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2011 >  28(1): 223-237

On the Evolution and Structure of a Radiation Fog Event in Nanjing

  • 1.

    Key Laboratory for Atmospheric Physics and Atmospheric Environment, Nanjing University of Information Science & Technology, Nanjing 210044,Key Laboratory for Atmospheric Physics and Atmospheric Environment, Nanjing University of Information Science & Technology, Nanjing 210044,Key Laboratory for Atmospheric Physics and Atmospheric Environment, Nanjing University of Information Science & Technology, Nanjing 210044,Key Laboratory for Atmospheric Physics and Atmospheric Environment, Nanjing University of Information Science & Technology, Nanjing 210044


doi: 10.1007/s00376-010-0017-0

  • An extremely dense radiation fog event during 10--11 December 2007 was studied to understand its macro-/micro-physics in relation to dynamic and thermodynamic structures of the boundary layer, as well as its structural evolution in conjunction with the air-surface exchange of heat and water vapor. The findings are as follows. The extreme radiation fog process was divisible into formation, development, mature, and dissipation phases, depending on microstructure and visibility. This fog event was marked by rapid evolution that occurred after sunrise, when enhanced surface evaporation and cold air intrusion led to a three order of magnitude increase in liquid water content (LWC) in just 20 minutes. The maximum droplet diameter (MDD) increased four-fold during the same period. The fog structure was two-layered, with the top of both the surface-layer and upper-layer components characterized by strong temperature and humidity inversions, and low-level jets existed in the boundary layer above each fog layer. Turbulence intensity, turbulent kinetic energy, and friction velocity differed remarkably from phase to phase: these features increased gradually before the fog formation and decreased during the development phase; during the mature and dissipation phases these characteristics increased and then decreased again. In the development and mature stages, the mean kinetic energy of the lower-level winds decreased pronouncedly, both in the horizontal and vertical directions.
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    • Manuscript History

    Manuscript received: 10 January 2011
    Manuscript revised: 10 January 2011
    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

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    On the Evolution and Structure of a Radiation Fog Event in Nanjing

    • 1. Key Laboratory for Atmospheric Physics and Atmospheric Environment, Nanjing University of Information Science & Technology, Nanjing 210044,Key Laboratory for Atmospheric Physics and Atmospheric Environment, Nanjing University of Information Science & Technology, Nanjing 210044,Key Laboratory for Atmospheric Physics and Atmospheric Environment, Nanjing University of Information Science & Technology, Nanjing 210044,Key Laboratory for Atmospheric Physics and Atmospheric Environment, Nanjing University of Information Science & Technology, Nanjing 210044
    • Manuscript received: 2011-01-10
    • Manuscript revised: 2011-01-10

    Abstract: An extremely dense radiation fog event during 10--11 December 2007 was studied to understand its macro-/micro-physics in relation to dynamic and thermodynamic structures of the boundary layer, as well as its structural evolution in conjunction with the air-surface exchange of heat and water vapor. The findings are as follows. The extreme radiation fog process was divisible into formation, development, mature, and dissipation phases, depending on microstructure and visibility. This fog event was marked by rapid evolution that occurred after sunrise, when enhanced surface evaporation and cold air intrusion led to a three order of magnitude increase in liquid water content (LWC) in just 20 minutes. The maximum droplet diameter (MDD) increased four-fold during the same period. The fog structure was two-layered, with the top of both the surface-layer and upper-layer components characterized by strong temperature and humidity inversions, and low-level jets existed in the boundary layer above each fog layer. Turbulence intensity, turbulent kinetic energy, and friction velocity differed remarkably from phase to phase: these features increased gradually before the fog formation and decreased during the development phase; during the mature and dissipation phases these characteristics increased and then decreased again. In the development and mature stages, the mean kinetic energy of the lower-level winds decreased pronouncedly, both in the horizontal and vertical directions.

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