Identification of Visibility Reducing Weather Phenomena Due to Aerosols

Visibility reduction is usually caused by hydrometeor and lithometeor such as precipitation, fog, mist, haze, and dust. Among these weather phenomena the distinction of mist, haze and Asian dust is very difficult for naked observers especially for the case of mist and damp haze. A method for the distinction of mist, haze and Asian dust has been developed using the synoptic surface weather reporting data and the size segregated aerosol data (PM 1 , PM 2.5 and PM 10 ) monitored at six sites over South Korea for three years (2009 to 2011). It is found that mist can be identified from haze with the use of observed water vapor mixing ratio and its 15-day trend curve for the data exceeding the minimum PM 10 concentration that causes visibility reduction at each monitoring site; Asian dust events are identified with conditions of hourly mean PM 10 concentration exceeding 90 mg m -3 and the ratio of PM 10 /PM 1 ≥ 4. It is also found that the visibility reducing weather events (occurrence frequency) are haze (23 %), mist (19 %), precipitation (13 %), fog (9 %) and Asian dust (1.1 %) in order at the island site, while those events (occurrence frequency) are haze (29 %), mist (21 %), precipitation (13 %), Asian dust (2.1 %) and fog (0.3 %) in order at the inland site, indicating more frequent occurrence of fog events at the island site. However, haze and mist events are found to occur most frequently at both the island and the inland sites caused by anthropogenic aerosols.

[1]  Moon-Soo Park,et al.  A simulation of Asian dust events in March 2010 by using the ADAM2 model , 2012, Theoretical and Applied Climatology.

[2]  Lina Gao,et al.  Visual Range Trends in the Yangtze River Delta Region of China, 1981–2005 , 2011, Journal of the Air & Waste Management Association.

[3]  Yan Yin,et al.  A comparative analysis of aerosol properties in dust and haze-fog days in a Chinese urban region , 2011 .

[4]  Chunxiang Cao,et al.  Monitoring haze episodes over the Yellow Sea by combining multisensor measurements , 2010 .

[5]  Thomas J. Smith,et al.  Economic Activity and Trends in Ambient Air Pollution , 2010, Environmental health perspectives.

[6]  Jinsang Jung,et al.  Aerosol chemistry and the effect of aerosol water content on visibility impairment and radiative forcing in Guangzhou during the 2006 Pearl River Delta campaign. , 2009, Journal of environmental management.

[7]  R. Dickinson,et al.  Clear Sky Visibility Has Decreased over Land Globally from 1973 to 2007 , 2009, Science.

[8]  Y. J. Kim,et al.  Summer time haze characteristics of the urban atmosphere of Gwangju and the rural atmosphere of Anmyon, Korea , 2008, Environmental monitoring and assessment.

[9]  Yang Li,et al.  Horizontal visibility trends in China 1981–2005 , 2007 .

[10]  Menas Kafatos,et al.  Influences of Winter Haze on Fog/Low Cloud Over the Indo-Gangetic Plains , 2007 .

[11]  Young-Joon Kim,et al.  Characteristics of aerosol observed during two severe haze events over Korea in June and October 2004 , 2006 .

[12]  Soon-Ung Park,et al.  Direct radiative forcing due to anthropogenic aerosols in East Asia during April 2001 , 2004 .

[13]  Paul J. Crutzen,et al.  New Directions: The growing urban heat and pollution "island" effect - impact on chemistry and climate , 2004 .

[14]  Ju-Yeon Lim,et al.  The recent characteristics of Asian dust and haze events in Seoul, Korea , 2004 .

[15]  Soon-Ung Park,et al.  Parameterization of Asian dust (Hwangsa) particle-size distributions for use in dust emission models , 2004 .

[16]  Joyce E. Penner,et al.  Observational evidence of a change in radiative forcing due to the indirect aerosol effect , 2004, Nature.

[17]  Soon-Ung Park,et al.  The soil particle size dependent emission parameterization for an Asian dust (Yellow Sand) observed in Korea in April 2002 , 2003 .

[18]  Thomas Heistracher,et al.  Local particle deposition patterns may play a key role in the development of lung cancer. , 2003, Journal of applied physiology.

[19]  F. Binkowski,et al.  Models-3 community multiscale air quality (cmaq) model aerosol component , 2003 .

[20]  J. Hansen,et al.  Climate Effects of Black Carbon Aerosols in China and India , 2002, Science.

[21]  O. Boucher,et al.  A satellite view of aerosols in the climate system , 2002, Nature.

[22]  J. Watson.  Visibility: Science and Regulation , 2002, Journal of the Air & Waste Management Association.

[23]  R. Sequeira,et al.  Visibility degradation across Hong Kong: its components and their relative contributions , 2001 .

[24]  Robert Frouin,et al.  Asian Dust Events of April 1998 , 2001 .

[25]  M. Jacobson.  Strong radiative heating due to the mixing state of black carbon in atmospheric aerosols , 2001, Nature.

[26]  William C. Clark,et al.  Climate Change 1995: The Science of Climate Change , 1997 .

[27]  D. Dockery,et al.  An association between air pollution and mortality in six U.S. cities. , 1993, The New England journal of medicine.

[28]  J Schwartz,et al.  Air pollution and daily mortality: associations with particulates and acid aerosols. , 1992, Environmental research.

[29]  C. Pope,et al.  Daily mortality and PM10 pollution in Utah Valley. , 1992, Archives of environmental health.

[30]  Hatch Tf,et al.  Deposition and retention models for internal dosimetry of the human respiratory tract. Task group on lung dynamics. , 1966 .

[31]  J. Paton.  Handbook of aviation meteorology: Air Ministry, Meteorological Office. H.M. Stationery Office, London, 1960. 404 pp., 25s , 1961 .

[32]  Nikos E. Mastorakis,et al.  Recent Advances in Fluid Mechanics and Heat & Mass Transfer , 2011 .

[33]  M. Sharan,et al.  Visibility and Incidence of Respiratory Diseases During the 1998 Haze Episode in Brunei Darussalam , 2003 .