Seasonal Temporal And Spatial Distribution Of Comfortable Climate In Eastern China

Comfortable climate is often divided into two types: summer-avoidance type and winter-proof type,but there is a lack of research on spring-appropriate and autumn-appropriate types.There are large differences in temperature,dry and humidity between north and south in eastern my country,and the mountains,hills,and plains are complex and diverse.It is meaningful to study the climates that are suitable for spring and autumn,summer shelter and winter cold in eastern my country in terms of latitude differences,and to discuss the relationship between different comfortable climates and the comfort period and altitude.This paper takes the Heihe-Tengchong population density boundary as a reference,and takes 24 provinces and cities in the eastern part of my country completely or mostly included as the study area,and uses the daily scale of 194 meteorological stations for 30 years from 1991 to 2021.Based on the average temperature,relative humidity,10 m wind speed and air pressure,the comfortable climate index(UTCI)was calculated.Combined with the method of Arc Gis geostatistical interpolation analysis and linear tendency rate,the temporal and spatial distribution of comfort climate and its comfort period in eastern my country,and the relationship with altitude are analyzed and studied,and the following conclusions are drawn:(1)From the perspective of the spatial distribution of comfortable climate in eastern my country,the distribution area of comfortable climate in spring and autumn accounts for about 2/3 of the total area of eastern China,and it shows a regular pattern of advancing north in spring and retreating south in autumn with time.In summer,my country's comfortable climate is widely distributed in the three northeastern provinces at high latitudes,the northern provinces and cities in North China,and the southwestern mountainous areas.It is a regionally strong climate resource.The comfortable climate in winter has obvious latitudinal characteristics and is mainly distributed in the south of Qinling-Huaihe Line.It is a climate resource with strong regional monopoly.(2)From the perspective of the distribution of meteorological stations of the combination type of comfortable climate and the geographical area of comfortable climate,the meteorological stations suitable for spring and autumn account for the largest proportion,accounting for about 58.08% of the total area of eastern my country,mainly in the central province of eastern my country cities,such as Shandong,Henan,etc.The summer weather stations accounted for 10.31%,and the area accounted for 58.16%,mainly distributed in the three northeastern provinces.There are a total of 4 meteorological stations of winter sheltering type,and their distribution area accounts for about 32.48% of the eastern part of my country.They are mainly distributed in low-latitude provinces and cities south of the Yangtze River,such as Yunnan and Hainan.The proportion of meteorological stations suitable for spring and winter and suitable for summer and autumn in the two seasons are 6.70% and 7.73%respectively;the proportion of meteorological stations suitable for spring,autumn and winter suitable for the three seasons is 6.19% and 29.33% respectively;There are only6 meteorological stations suitable for the four seasons,mainly in Yunnan and Guizhou provinces.(3)From the perspective of the comfort period of the comfortable climate,the spatial distribution of the comfortable period in spring and autumn has great similarity.Generally speaking,the comfortable period is more than 60 days,and the frequency of the comfortable period in spring and autumn is 51.91% to 88.49% and 55.59% to83.72%.The summer-type comfortable climate showed obvious latitude zonality and mountain vertical zonality.The average climate comfort period was 50 days or more,and the comfort frequency of the comfortable climate was 73.37% to 94.90%.The winter climate is mainly distributed in the low latitudes of China,with an average comfort period of 70 to 82.6 days and a comfort frequency of 63.30 to 92.11%.From the distribution of the comfort period of the combined climate types,the comfortable frequency range of the suitable climate in spring and winter is 39.31?98.70%,and the comfortable climate in winter is better than that in spring.The comfortable frequency range of summer and autumn suitable type is 53.30?96.99%,and the comfortable frequency in summer is higher than that in autumn.The comfortable frequency range of suitable climate in spring,summer and autumn is 54.35?99.96%,and the range of comfortable period days is 50?91.97 days.In general,the comfortable period is the longest in summer,followed by autumn and the shortest in spring.The frequency range of suitable climate comfort period in spring,summer and autumn is24.76?99.89%,and the comfort period range is about 50?89.5 days,among which the comfort period is the longest in winter,followed by spring and the shortest in autumn.The four season suitable climate is mainly distributed in Yunnan and Guizhou provinces.(4)From the weighted area of Tyson polygons in the comfort period of the 24 provinces and cities in eastern my country,Yunnan and Guizhou are in the A(excellent)comfort period;B(good)comfort period grades include 7 provinces and cities including Chongqing,Hubei,Hunan,Zhejiang,Shanghai,Fujian and Shaanxi;C(medium)comfort level includes Jiangxi,Shanxi,Jiangsu,Henan,Anhui,Hebei,Shandong,Guangxi,Guangdong,Tianjin,Liaoning,Beijing and Jilin a total of 13 provinces and cities;the provinces and cities with D(poor)comfort level and E(poor)comfort level are Heilongjiang and Hainan respectively.(5)Judging from the changes in the linear trend rate of the four-season average climate comfort period in eastern my country,the area ratios of increased,unchanged,and decreased areas in the spring comfort period in the past 30 years are 82.48%,0.16%,and 17.36%,respectively;the summer comfort period has increased,unchanged and decreased area ratios were 30.30%,0.46%,and 69.24%,respectively;the increased,unchanged,and decreased area ratios of autumn comfort period were55.03%,0.31%,and 44.66%,respectively;winter comfort period increased,unchanged,and decreased The area ratios were 52.94%,7.01%,and 26.76%,respectively.(6)The altitude was positively correlated with the distribution of the spring and autumn suitable climate and the summer summer climate,which promoted the improvement of the comfort index and the increase of the comfort period,and to a certain extent expanded the distribution area of the spring and autumn suitable climate and the summer summer climate;the altitude was negatively correlated with the winter cold climate,which reduced the distribution area of the winter cold shelter climate to a certain extent.