STUDY ON EVALUATION AND PARAMETERIZATION OF VISIBILITY MEASURING METERS IN GUANGZHOU
ZHANG Jing
ZHANG Zhi-jian
LIAO Fei
MENG Yue
Abstract：To find out the difference and correlation between atmospheric visibility data from instrumental and visual observation,this article analyzes the visibility data from two kinds of visibility measuring meters and manual observations in Weather Observatory of Guangzhou.The results show that the visibility data from the two methods all have positive correlation.When the visibility is within 3km and 10～30 km,they have high consistency.On five different points of time,the concordance rates between the two methods are more than 90％.The average relative error is lower in 10～30 km and higher than 20％ in other ranges.At 11:00,14:00 and 17:00,the average relative error is lower than 10％.In 1～10 km,with the visibility increasing,the average relative error and gross error increase,while the concordance rate reduces.To forecast the visibility more accurately,a parameterization model of visibility is established based on the particle number concentration(N) and relative humidity(RH),which can simulate the change tendency of visibility generally.Actual cases verified that most of the visibility estimation error is less than 3 km.
Keywords：visibilitydata quality evaluationparameterization
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 985-991 )