To investigate the spatiotemporal variations of sunshine duration in Chongqing Municipality,and analyze the factors influencing these variations,data from 34 meteorological stations in Chongqing from 1961 to 2020 is u-tilized,including daily sunshine duration,wind speed,temperature,total cloud cover,and relative humidity.Meth-ods such as the Mann-Kendall(M-K)test,wavelet analysis,and spatiotemporal hotspot detection are employed to analyze the spatiotemporal changes of sunshine duration in the region and identify the influencing factors.The re-sults show that:① The sunshine hours in Chongqing present a distribution characteristic of"high in the northeast and low in the southeast".High values are concentrated in Wushan,Wuxi and other places;low values are concen-trated in Pengshui,Youyang and other places.②The annual average sunshine hours showed a very significant downward trend;the abrupt change year was 1979,and the main period of oscillation was 46a.All seasons except spring show a downward trend.③ Spatial-temporal pattern mining shows that the sunshine hours in the past 60 years present a mixed clustering and oscillating cold spot pattern.④ The seasonal variations in correlation coeffi-cients indicate that the relationships between the factors and sunshine duration are not constant throughout the year.Among them,wind speed,total cloud cover,and relative humidity show significant correlations with sunshine dura-tion in all four seasons.Precipitation and temperature,on the other hand,are closely related to sunshine duration primarily in the summer season.
sunshine durationMann-Kendall testwavelet analysisspatial and temporal cubes
NETL
NSTL
万方数据
