ABSTRACT
Based
on the daily maximum temperature data of 31 meteorological observation stations and
some statistical methods, the temporal and spatial characteristics of summer
extreme high temperature in Guizhou province from 1970 to 2020 are analyzed.
The results indicate that: 1) The threshold of extreme high temperature (EHT)
in summer in Guizhou province had a large spatial difference, with decreasing
characteristics from the northeast to the southwest, it was negatively
correlated with the altitude. 2) In most parts of Guizhou province, the extreme
high temperature days (EHTD) in summer can reach about 4.2 d, the lowest EHTD occurred in the
southernmost part. From June to August, the EHTD gradually increased,
especially in Central and eastern parts of
Guizhou province. However, the extreme high temperature intensity (EHTI)
displayed similar distribution characteristics in summer, June, July and
August, with larger value in the northeast part and lower value in the
southwest part of Guizhou. 3) EHTD
had a rising trend in almost stations, except for the PZ station, the increased
range and intensity gradually increased from June to August. But the EHTI had a larger
spatial difference, especially in June, it declined in most parts of Guizhou,
the declined scope and intensity gradually decreased in
July, and completely increased in August, this made EHTI show an increasing
trend in summer in most parts the Guizhou province. 4) The averaged EHTD
increased by 0.62 d/10a (p < 0.1),
the significant increase also occurred in August, but it increased
insignificantly in June and July. The averaged EHTI had insignificant increase
in summer and the three months. In general, the EHTD and EHTI increased in most parts of Guizhou
province during the period of 1970-2020, this may be related to the
changes of them in August.