Climate Characteristics and Influencing Factors Analysis of the Highest Summer Temperature in Guizhou Province
ZENG Ni
HE Liyang
FANG Peng
YANG Yumeng
MENG Jun
HU Qiuhong
LIU Siyang
Abstract：To explore the climatic characteristics and influencing factors of summer maximum temperatures in Guizhou Province,this study analyzed daily maximum temperature data from 84 national meteorological stations in Guizhou Province from June to August during 1972-2021,along with the subtropical high index,seven atmospheric circulation indices from the National Climate Center,and the NCEP/NCAR second reanalysis data.Methods such as empirical orthogonal function(EOF)expansion,Mann-Kendall non-parametric statistical test,Morlet wavelet analysis,and synthetic analysis were applied.The results show that there are multiple time-scale oscillations of mean maximum summer temperature in Guizhou Province,including quasi 2-4-year,quasi 8-year,and quasi 16-year cycles.An 8-year cycle is associated with anomalously high temperatures,while a 6-year cycle corresponds to anomalously low temperatures.Spatially,the maximum summer temperature is characterized by higher values in the eastern and southern regions,and lower values in the west.The leading EOF mode of summer maximum temperature shows a spatially consistent pattern across the province,counting for 78.67%of the variance,followed by a north-south dipole pattern,explaining 5.95%of the variance.The first mode of summer maximum temperature is significantly positively correlated with the ridge position of the subtropical high and the Tibetan Plateau index-1,and significantly negatively correlated with the Asian zonal circulation index and the East Asia Trough position index.The second mode is significantly negatively correlated with the area and intensity indices of the subtropical high,and significantly positively correlated with the Tibetan Plateau index-1,Tibetan Plateau index-2,and the India-Myanmar trough intensity index.When the summer maximum temperature is abnormally high,the 500 hPa geopotential height anomaly field over mid to high latitudes in Asia mainly exhibits a"positive-negative-positive"meridional structure.At this time,most areas in mid to high latitudes of China experence positive heght anomalies,while areas south of 30 °N are negative anomalies.When abnormally low temperature years,the anomaly field displays a"negative-positive-negative"pattern,with negative anomalies across most areas of China ecept South China.
Keywords：maximum temperaturewestern pacific subtropical highsubtropical high indexMann Kend-all non parametric statistical testMorlet wavelet analysis
Publication Date：2025-10-25
Online Publishing Date：2025-11-25(First online date of this platform, not the publication date of the document)
Pages：8( 710-717 )