Correlation Analysis Between Haze and GNSS Tropospheric Delay Based on Coherent Wavelet

Firstly, by analyzing the correlation coefficient between ZTD (zenith tropospheric delay) and AQI (air quality index) of IGS(International GNSS Service) Beijing station in 2014-2017 every month, it is found that the ratio of the absolute value of the correlation coefficient over 0.4 on the monthly scale is 29.17%, and the strong correlation characteristic is shown on the macro. Secondly, wavelet coherence are used to analyze the correlation of annual ZTD and AQI during the period of Beijing 2014-2017. It is found that ZTD and AQI have strong correlation in a certain time frequency domain and pass the 95% confidence test.Finally, according to the correlation analysis of ZTD and AQI in some time domains of Beijing and Changchun, the ZTD and AQI in March in Beijing showed a positive correlation on the whole, and AQI had a good correlation with temperature, pressure, humidity and wind speed.In the study, straw burning in the time domain aggravated the formation of haze in Beijing and Changchun, and then affected the tropospheric delay.