The uniqueness of "Liupanshui in Du Liang, China" is mainly reflected in the combination of "cool, comfortable, moist, fresh and moderate ultraviolet rays", which is not only the concentrated expression of the research group's achievements, but also unanimously recognized by the expert committee.
"Cool and comfortable": The mayor of Liupanshui has no summer, and spring and autumn are connected. The average temperature in June is 18.3℃, the hottest average temperature in July is only 19.8℃, and the average temperature in August is 19.2℃. The extreme maximum temperature in history is only 3 1.2℃. Based on the domestic human comfort standards, this paper makes a detailed statistical analysis of the urban climate data of 197 1 ~ 2000. The results show that in Liupanshui, people feel cool and comfortable for more than 96% of the time, whether in the morning, noon and evening of a day or in the whole "summer". Among them, July and August are the most comfortable months in our city, and the human body feels cool and comfortable more than 97% of the time.
Tianshenghu Lake in Shuicheng County
Comparing the daily average temperature, daily maximum temperature, daily minimum temperature and human comfort of 729 meteorological stations in China (the data age is 197 1 to 2000), Liupanshui is unique in terms of "cool, comfortable and humid".
"Moisturizing" means that under the climatic conditions of Liupanshui, the average relative humidity from June to August is about 83%, and there is no pain of extreme heat and dryness, and there is no discomfort of damp heat; This is also one of the important factors that make Liupanshui cool and comfortable in summer with warm temperature and warm breeze.
"Fresh": Although Liupanshui is a new industrial city and "Jiangnan Coal Capital", the municipal party committee and government attach great importance to environmental protection, so the air quality has been maintained at the first-class level in the province in recent years. According to the monitoring results in the past ten years, the air quality in the central city has improved year by year, and the number of days to reach excellent and good from 2000 to 2003 has increased from 85.8% to 96.7%. The annual average value of sulfur dioxide and nitrogen dioxide reached the first-class standard of Ambient Air Quality Standard (GB 3095- 1996), and the annual average value of total suspended particles reached the Ambient Air Quality Standard (GB 3095- 1996).
Compared with other cities in the province, from 200/kloc-0 to 2003, the concentration of various pollutants was at a low level, especially the concentration of sulfur dioxide was the lowest in major cities in the province, and the acid rain rate was zero for three consecutive years.
The negative ion observation experiment and preliminary analysis show that the average negative ion concentration in Liupanshui is 583 /cm3, and the maximum is 1677 /cm3, so the air quality is fresh and pleasant.
Liupanshui city is about 1800 meters above sea level, with good forest vegetation and fresh air. It has the characteristics of both alpine climate and forest climate, has certain climatic recuperation function and convenient transportation. It is a good place for leisure travel and holiday recuperation.
"Moderate ultraviolet radiation": theoretical calculation and analysis of ultraviolet radiation, case analysis of air relative humidity detection under quasi-clear sky, comparative analysis of actual observation cases of ultraviolet radiation, and comparative analysis of factors (ground relative humidity, sunshine and cloud cover) affecting the intensity of ultraviolet radiation in urban areas show that the ultraviolet radiation in Liupanshui is not as strong as generally believed, and it is smaller than that in similar cities; This is mainly because there is often a high humidity layer over Liupanshui, with few sunny days and high ground humidity; In the summer of 2004, the instantaneous maximum intensity in urban areas was 32 W/m2, which was only equivalent to the third level of ultraviolet intensity (according to the ultraviolet index of China Meteorological Bureau).
Therefore, Liupanshui, which is cool, comfortable, moist, fresh and with moderate ultraviolet radiation, is a well-deserved "cool capital of China".