主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

Journal of Meteorology and Environment ›› 2021, Vol. 37 ›› Issue (3): 25-32.doi: 10.3969/j.issn.1673-503X.2021.03.004

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Comparison of visibility measurements using DNQ1 and FD12 visibility meters and their major influencing factors

Xiao-lan LI1,2(),Wei-jun QUAN3,*(),Dong-dong WANG2,Di WANG4   

  1. 1. Shangdianzi National Atmosphere Watch Station, Beijing 101500, China
    2. Institute of Atmospheric Environment, CMA, Shenyang 110166, China
    3. Environmental Meteorological Forecast Center of Beijing-Tianjin-Hebei, Beijing 100089, China
    4. Liaoning Meteorological Service Center, Shenyang 110166, China
  • Received:2021-01-07 Online:2021-06-30 Published:1900-01-01
  • Contact: Wei-jun QUAN E-mail:leexl.ouc@163.com;quanquan78430@163.com

Abstract:

The DNQ1 forward scattering visibility meter is currently one of the most widely used visibility meters at weather stations in China.However, rare studies have evaluated and compared the performance of DNQ1 visibility meters with other similar visibility instruments worldwide.Therefore, we conducted a comparative study using observation data of DNQ1 and FD12 visibility meters at the Shangdianzi National Atmosphere Watch Station from January to March 2015.The characteristics of observed differences between the two visibility meters and their relationships with major meteorological parameters and atmospheric components were analyzed in this study.The results indicated that hourly mean visibility measured by two instruments exhibits a consistent variation trend, with a correlation coefficient of 0.98.Except for rainfall, the difference in visibility observed by DNQ1 and FD12 instruments is less affected by different weather conditions (including sunny days, sand-dust, fog, haze, rainfall, and snowfall), but the difference range and dispersion increase as visibility level increases.The visibility difference shows an exponential decrease with the increase of relative humidity, a linear positive correlation with air temperature, and an insignificant relationship with air pressure, wind speed, and wind direction.The mean relative deviation between DNQ1-and FD12-measured visibility at different times of the day is on average less than ±10%, which indicates that the NDQ1 visibility meter meets observation needs.The correlation between the two visibility at night is better than that during the day, which may be related to the daily variation of relative humidity and temperature.

Key words: Atmospheric visibility, DNQ1 visibility meter, FD12 visibility meter, Meteorological parameter

CLC Number: