厄尔尼诺事件对中国沿海地区水汽变化周期的影响OA北大核心CSTPCD

Frequent occurrence of extreme weather could be led by El Niño event.There are many coastal cit-ies in China,and the cities are with different climate types distributed.An analysis on the impact of EI Nino events on precipitable water vapor(PWV)changes in coastal areas of China and whether there are spatial differences is done.Based on GNSS PWV time series of CMONOC in Chinas coastal areas,and based on the El Niño event(IEP,ICP)index,and by using Fast Fourier Transform(FFT)and Wavelet Transform(WT)methods,the GNSS PWV time series change analysis is carried out from the frequency domain and time domain to analyze the impact of eastern and central type El Nino events on the PWV change in China's coastal areas.It is found that the occurrence of GNSS PWV Outlier corresponds to the El Niño event in the corresponding period.The correlation between eastern type El Niño(IEP)and PWV at most GNSS stations is positive;the correlation between the central type index(ICP)and GNSS PWV is negative.The impact of El Niño events on the cycle of PWV changes are relatively small on a daily period.In the 5d and 10d cycles,the PWV cycle under the influence of eastern and central El Niño e-vents are smaller than the PWV cycle during normal periods.