Variation trend of annual average temperature in Fujian Province

The records of climate change in Fujian local chronicles began in the fourth year of Daguan in the Northern Song Dynasty (1 1 10), which is nearly 900 years ago. Judging the temperature changes in the first 800 years mainly depends on the records in local chronicles; The temperature change after 100 years is mainly based on the instrument observation data. Looking at the temperature changes in Fujian in recent 900 years, it has experienced four stages: cold, warm, cold and warm.

(1) cold period (11/kloc-0 ~1190)

During this period, heavy snow and freezing weather frequently occurred in the coastal areas of southeast Fujian, and three snowfall and freezing events covered the whole province. It first appeared in the fourth year of Daguan in Song Dynasty (1110); The second time appeared in the first year of Shaoxing in the Song Dynasty (1 13 1 year); The third time appeared in Song and Yuan Dynasties (1 190). At this stage, the lower reaches of the Yangtze River are also very cold, and the Yangtze River and Taihu Lake have been frozen many times.

(2) Warm period (1200 ~ 1500)

Frost and snow disasters in this period are rarely recorded in local chronicles, only recorded in individual years and places. For example, in the 13th year of Yuan Dynasty (1353), there were records of "frost killing crops" in Shaowu and Guangze counties. In the first half of this stage, the climate in northern China is also warmer, and bamboo can grow in Xi, Shaanxi and Aibo, Henan. From the fourth year of Song Xianchun (1268) to the twenty-ninth year of Yuan Dynasty (1292), the "Bamboo Supervision Department" was established in the yamen. The climate in Zhejiang is also warmer. According to records, Song Qingyuan lived for six years (1200), Jiading lived for six years (12 13), Jiading lived for nine years (12 16) and Jiading lived for thirteen years (1220).

(3) Cold period (150 1 ~ 1900)

During the 400 years from the mid-Ming Dynasty (about16th century) to the late Qing Dynasty, the temperature dropped, which was another cold period. However, during this period, there were also several years when the temperature was high. Therefore, it can be roughly divided into 7 minor cold periods and 6 minor warm periods.

The first slight cold period (1501~1533); The first small warm period (1534 ~1554);

The second slight cold period (1555 ~ 158 1 year); The second warm period (1582 ~1625);

The third slight cold period (1626 ~1684); The third warm period (1685 ~1719);

The fourth slight cold period (1720 ~1752); The fourth warm period (1753 ~1787);

The fifth slight cold period (1788 ~1816); The fifth warm period (1817 ~1831year);

The sixth slight cold period (1832 ~1852); The sixth warm period (1853 ~1872);

The seventh slight cold period (1873 ~ 19 13).

(4) Warm period (from 19 14)

From the cold period at the end of last century to the 20th century, the temperature fluctuated in a pulsating way, but generally it evolved in a warm direction. The average temperature of Fuzhou in the three years of the Republic of China (19 14) and the four years of the Republic of China was 20.0℃, which was 0.8℃ higher than that in the twenty-ninth year of Guangxu (1903). In the three and four years of the Republic of China, the annual average temperature in Xiamen was 22.2℃, which was 1. 1℃ higher than that in the thirty-first year of Guangxu (1905). After 4 years of the Republic of China, the temperature in this province dropped obviously in a short time. In 6 and 7 years of the Republic of China, low temperature weather appeared for two consecutive years, which was mainly manifested by the obvious drop in winter temperature, that is, the winter was cold. The average annual temperature of Fuzhou in 6 and 7 years of the Republic of China was 65438 08.7℃, which was 65438 0.3℃ lower than that in 3 and 4 years of the Republic of China. The average annual temperature of Xiamen in 6 and 7 years of the Republic of China was 20.9℃, which was 0.3℃ lower than that in 3 and 4 years of the Republic of China. The average temperature (10.9℃) in Fuzhou in the six years of the Republic of China was 2.6℃ lower than that in the four years of the Republic of China. The average temperature in June 5,438+1October 7 was 6.8℃, which was 5.0℃ lower than that in June 5,438+1October 3. The average temperature in Xiamen in the six years of the Republic of China was 13.9℃, which was 2.8℃ lower than that in the four years of the Republic of China. The average temperature in the seven years of the Republic of China was 10.3℃, which was 4.6℃ lower than that in the three years of the Republic of China.

After two years of cold in 6 years and 7 years of the Republic of China, the temperature in Fujian showed an obvious warming trend until the mid-1940s. 35 years of the Republic of China was the warmest year in the first half of this century. In 35 years of the Republic of China, the annual average temperature in Fuzhou was 2.6℃ higher than that in 6 and 7 years of the Republic of China (the height difference has been corrected). The average annual temperature in the 35 years of the Republic of China in Xiamen was 65438 0.8℃ higher than that in the 6 years and 7 years of the Republic of China.

From the mid-1940s to the mid-1950s, the temperature in this province dropped again. The annual average temperature in Fuzhou 1955 and 1957 decreased by 1.7℃ and 1.8℃ respectively. 1955 and 1957, the annual average temperature in Xiamen is 2.2℃ and 2. 1℃ lower than that in 1935, respectively. 1955, 1956 The annual average temperature in Pucheng was 16.9℃, which was lower than that in 35 years of the Republic of China 1.6℃. 1956 Longyan annual average temperature 19.6℃, lower than that in 35 years of the Republic of China 1.4℃.

From the mid-1950s to the early 1960s, the temperature in this province increased slightly. 1963 The annual average temperature in Fuzhou is 20. 1℃ (83.8m above sea level, the same below), which is 0.9℃ higher than that in 1957. The annual average temperature in Xiamen 1963 is 0.8℃ higher than 1955. The annual average temperature in Pucheng 196 1 is 0.9℃ higher than that in Pucheng 1956. The average temperature in Longyan 1964 is 20.2℃, which is 0.6℃ higher than that in 1956.

From the early 1960s to the late 1960s, the temperature in this province dropped slightly. 1969 Fuzhou average temperature 19.3℃, 0.8℃ lower than 1963. Since the late 1960s, the temperature in this province has risen slightly, and then cooled down immediately. 1976 is the lowest temperature in recent ten years. 1976 The average temperature in Fuzhou is 19. 1℃, which is lower than 1963 1.0℃ and lower than 1935/.9℃. 1976 The average temperature in Xiamen was 20.6℃, which was 0.6℃ lower than that in 1963 and 2.0℃ lower than that in 35 years of the Republic of China (the height difference has been corrected). 1976 The average temperature in Pucheng was lower than that in 35 years of the Republic of China 1.7℃.

Since the mid-1970s, the temperature in Fuzhou has been on the rise (see Figure 2- 1). Judging from the temperature changes in Fuzhou, until 1996, the annual average temperature was still lower than that in 35 years of the Republic of China. 1996 The average annual temperature in Fuzhou is 19.7℃.

Figure 2- 1? The moving average curve of Fuzhou annual average temperature 10 year.

Figure 2- 1 is the 10 annual moving average curve of the annual average temperature in Fuzhou, which can represent the long-term change trend of the annual average temperature in Fujian since the 20th century.