Summary of a 4-Year Fog Field Study in Northern Nanjing, Part 2: Fog Microphysics

Comprehensive field observations of fog were conducted during the winters of 2006–2009 at the Nanjing University of Information Science & Technology, in order to study macro- and micro-physical structures and physical–chemical processes of dense fogs in northern Nanjing. The fog boundary-layer structures of different types and their corresponding characteristics are presented in Part I of these twin papers. In this second part, microphysical characteristics and droplet spectrum distributions of different types of fogs, microphysical relationships (among fog droplet concentration, liquid water content, and mean diameter), and microphysics of atmospheric aerosols during haze/fog events are discussed. The results show that there are large differences in microphysical parameters among four types of haze/fog. Many interesting phenomena, including fog burst reinforcement, fog droplet spectrum broadening, fog bimodal or multi-modal drop-size distributions, and critical triggering maxD value of fog coagulation growth, were captured during the 4-year field study.

[1]  R. Rasmussen,et al.  Evaporation of Nonequilibrium Raindrops as a Fog Formation Mechanism , 2010 .

[2]  J. Seinfeld,et al.  Chemical composition differences in fog and cloud droplets of different sizes , 1990 .

[3]  杨军,et al.  Microphysical Structure and Evolution of a Four-Day Persistent Fog Event in Nanjing in December 2006 , 2010 .

[4]  S. Niu,et al.  On the evolution and structure of a radiation fog event in Nanjing , 2011 .

[5]  H. Gerber.  Microstructure of a Radiation Fog , 1981 .

[6]  Jason A. Milbrandt,et al.  Probabilistic Parameterizations of Visibility Using Observations of Rain Precipitation Rate, Relative Humidity, and Visibility , 2010 .

[7]  [Microphysics of atmospheric aerosols during winter haze/fog events in Nanjing]. , 2010, Huan jing ke xue= Huanjing kexue.

[8]  Tao Wang,et al.  Measurement of aerosol number size distributions in the Yangtze River delta in China : Formation and growth of particles under polluted conditions , 2009 .

[9]  B. Zhu,et al.  Chemical composition of fog water in Nanjing area of China and its related fog microphysics , 2010 .

[10]  P. Baronti,et al.  A Study of Droplet Spectra in Fogs. , 1973 .

[11]  C. W. Rogers,et al.  The Life Cycle of Valley Fog. Part II: Fog Microphysics , 1975 .

[12]  J. Hudson.  Relationship Between Fog Condensation Nuclei and Fog Microstructure , 1980 .

[13]  Pu Mei-juan,et al.  Study on the Physical Characteristics of Burst Reinforcement during the Winter Fog of Nanjing , 2008 .

[14]  R. Eldridge.  Haze and Fog Aerosol Distributions , 1966 .

[15]  K. Noone,et al.  Measurements of the size dependence of the concentration of nonvolatile material in fog droplets , 1992 .

[16]  D. Kuroiwa.  ELECTRON-M1CROSCOPE STUDY OF FOG NUCLEI , 1951 .

[17]  T. E. W. Schumann,et al.  Theoretical aspects of the size distribution of fog particles , 2007 .

[18]  M. Haeffelin,et al.  Particulate contribution to extinction of visible radiation: Pollution, haze, and fog , 2009 .

[19]  Ralph G. Eldridge.  The Relationship Between Visibility and Liquid Water Content in Fog , 1971 .

[20]  N. R. Donaldson,et al.  Fog induced by mixed-phase precipitation , 1993 .

[21]  R. Eldridge.  a Few Fog Drop-Size Distributions. , 1961 .

[22]  Jason A. Milbrandt,et al.  Microphysical Observations and Mesoscale Model Simulation of a Warm Fog Case during FRAM Project , 2007 .

[23]  W. T. Roach.  On the effect of radiative exchange on the growth by condensation of a cloud or fog droplet , 1976 .

[24]  G. Garland Lala,et al.  Measurements of Visual Range and Radiation-Fog (Haze) Microphysics , 1980 .

[25]  R. Johnson,et al.  On fog formation in a coronal discharge: effects of the discharge on droplet growth , 1976 .

[26]  M. Wendisch,et al.  Gas-liquid equilibria in polluted fog , 1998 .

[27]  K. Pickering,et al.  Observations of the relationship between dew and radiation fog , 1978 .

[28]  M. Wendisch,et al.  Characteristics of haze, mist and fog , 1998 .

[29]  Y. Ming,et al.  Organic aerosol effects on fog droplet spectra , 2004 .

[30]  M. Haeffelin,et al.  PARISFOG: Shedding New Light on Fog Physical Processes , 2010 .

[31]  Shengjie Niu,et al.  Summary of a 4-Year Fog Field Study in Northern Nanjing, Part 1: Fog Boundary Layer , 2012, Pure and Applied Geophysics.

[32]  J. Podzimek.  Droplet Concentration and Size Distribution in Haze and Fog , 1997 .

[33]  A. Bott.  On the influence of the physico-chemical properties of aerosols on the life cycle of radiation fogs , 1991 .

[34]  The Microstructure of California Coastal Fog and Stratus , 1977 .

[35]  B. Ferrier,et al.  Asymptotic Analysis of Equilibrium in Radiation Fog , 2008 .

[36]  A method of comparison of two close batches data: Application to analysis of fog formation causes , 1993 .

[37]  H. Gerber.  Supersaturation and Droplet Spectral Evolution in Fog , 1991 .

[38]  Shengjie Niu,et al.  Analysis of the microphysical structure of heavy fog using a droplet spectrometer: A case study , 2010 .

[39]  John P. Oakley,et al.  The Fog Remote Sensing and Modeling Field Project , 2009 .

[40]  M. Pagowski,et al.  Fog Research: A Review of Past Achievements and Future Perspectives , 2007 .

[41]  Microphysical Structure and Evolution of a Four-Day Persistent Fog Event in Nanjing in December 2006 , 2010 .

[42]  Chunsong Lu,et al.  Fog research in China: An overview , 2010 .

[43]  Andreas Bott.  On the influence of the physico-chemical properties of aerosols on the life cycle of radiation fogs , 1991 .

[44]  Roy Rasmussen,et al.  Process-Oriented Analysis of Environmental Conditions Associated with Precipitation Fog Events in the New York City Region , 2008 .

[45]  P. Laj,et al.  Droplet Formation and Growth in Polluted Fogs , 1998 .

[46]  M. Wendisch,et al.  The size dependent composition of fog droplets , 1998 .

[47]  M. Facchini,et al.  The Po Valley Fog Experiment 1989 , 1992 .

[48]  A. H. Woodcock,et al.  Marine Fog Droplets and Salt Nuclei -Part 11 , 1978 .

[49]  M. H. Smith,et al.  A field study of radiation fog in meppen, West Germany , 1981 .

[50]  F. García-García,et al.  Fine-scale measurements of fog-droplet concentrations: a preliminary assessment , 2002 .