Effect of ENSO Events on the Climatological Characteristics of Dongguan
Using the meteorological observations from a national station in Dongguan from 1963 to 2021 and with the methods of mathematical statistics,tendency analysis and Mann-Kendall abruptness test,this paper studied from the aspect of typhoon,precipitation and air temperature,the effect of El Nino and La Nina episodes on the climatological characteristics of the city.The study has the following findings.(1)The probability for the El Nino episode to happen was larger before 2000 than after it.In addition,it lasted for shorter duration and had comparable occurrence probabilities with the La Nina episode after 2000.(2)For the El Nino(La Nina)year,there were decreased(increased)frequencies for typhoons to affect Dongguan,and the typhoon season was longer in the La Nina year,with earlier-than-usual dates of the annually first ty-phoon effect but later-than-usual dates of the annually last typhoon effect.(3)For Dongguan,in the non-rainy season of the El Nino year and the rainy season of the following year there was more precipitation,and in the rainy season of the El Nino year and the non-rainy season of the following year there was less precipita-tion,and in the year when the La Nina episode took place,there was less precipitation in both the rainy and non-rainy seasons.Both the El Nino and La Nina episodes affected the rainfall more significantly in the July-September rainy season;the stronger the ENSO event,the greater its effect on the precipitation.(4)The air temperature of Dongguan was little affected by the ENSO event,with relatively high temperature in the El Nino year and relatively low temperature in the La Nina year.The ENSO event also exerted little effect on the numbers of high-and low-temperature days in Dongguan,which varied much on the decadal scale.
万方数据
维普
