Plateau Meteorology

Plateau Meteorology >

2017 , Vol. 36 >Issue 6: 1693 - 1702

DOI: https://doi.org/10.7522/j.issn.1000-0534.2016.00130

Investigation on Norm of Haze Identification based on Hourly Auto-monitored Visibility

  • SHI Chun'e ,
  • ZHANG Hao ,
  • MA Jinghui ,
  • WU Biwen ,
  • WANG Xing ,
  • CHEN Rulong ,
  • YANG Yuanjian
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  • Anhui Institute of Meteorological Sciences, Key Laboratory for Atmospheric Sciences and Remote Sensing of Anhui Province, Hefei 230031, Anhui, China;Yangtze River Delta Center for Environmental Meteorology Prediction and Warning, Shanghai 200030, China;Hefei Meteorological Bureau, Hefei 230041, Anhui, China

Received date: 2016-09-12

  Online published: 2017-12-28

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Abstract

At present, auto-monitored visibility was adopted by more and more meteorological stations in China.At the same time, some weather phenomena were not recorded by observer any longer.It is necessary and urgent to set up a reasonable norm of haze identification using auto-monitored meteorological parameters, so that not only it contains information of air quality, maintains the continuity of annual haze days, but also the method is easy to put into application.In this paper, through summarizing of norms and some references related to haze identification, basic parameters were chosen for haze diagnosis.Based on analysis of relationship between PM2.5 concentration and relative humidity using hourly meteorological data at observatories of six cities in Anhui province, together with hourly PM2.5 concentrations published by environment department, four initial schemes were proposed, that are, auto-monitored visibility lower than 5 km, adopting critical relative humidity (RHc) as 90% (or 95%), considering PM2.5 concentration or not.Then, hourly and daily hazes of 2015 were re-diagnosed for those cities based on those schemes.Some rules were considered in the investigation of objective standards for haze identification, e.g., haze being indicator of air pollution, maintaining the continuity of annual haze days.The results indicated that hourly haze can be identified as "excepting hourly rainfall over 0.1mm, the auto-monitored visibility no more than 5 km with the RH lower than 90% (RHc=90%), neglecting PM2.5 concentration".A day with consecutive 6 h haze can be defined as a haze day.The annual haze days obtained by this method were reasonable and a good indicator of air quality.

Key words： Norm of haze; auto-monitored visib; PM2.5; critical relative hu; Anhui

Cite this article

SHI Chun'e , ZHANG Hao , MA Jinghui , WU Biwen , WANG Xing , CHEN Rulong , YANG Yuanjian . Investigation on Norm of Haze Identification based on Hourly Auto-monitored Visibility[J]. Plateau Meteorology, 2017 , 36(6) : 1693 -1702 . DOI: 10.7522/j.issn.1000-0534.2016.00130

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