ANALYSIS OF THE TREND CHARACTERS OF THE POOR VISIBILITY HOURS IN HONG KONG IN 1968-2014 A
XIE Fei
WU Xiang-hua
HE Hong-rang
CHEN Ze-huang
BIAN Shuang-shuang
MIU Zi-qing
Abstract：In order to do the research of the trends variations of the visibility in Hong Kong,the HHT transform was used to analyze the periodic changes of low visibility hours in 1968-2014 a.The mutation point of the low visibility hours was found out based on the instantaneous energy (IE),degree of stationary (DS) and Mann-Kendall test.Then the M-K test was used to prove the correction of the mutation point.With the help of student's test,the correlations between the low visibility hours with the pollutants in 1997-2013 were also analyzed.The conclusions could be drawn as follows:the hours of poor visibility in Hong Kong are growing and their variations have 1 a,2 a,3 a,7 a inter annual variation periods and 10 a,20 a inter generational change cycles.And the hours in spring and autumn are following from that in winter,and the hours in summer are the least.Variations of the hours occur mutation at 1993.According to the test,the correlations between the hours with SO2、NOx、RSP、PM2.5、VOC、CO are significant under 0.05 level.
Keywords：poor visibilityHHT transformcycle variationsmutation changeHong Kong
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( 127-133 )