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Subtropical monsoon climate, also known as subtropical monsoon climate, is a mid-latitude monsoon climate type controlled alternately by tropical marine air mass and polar continental air mass, with obvious non-periodic changes in weather and seasonal changes in precipitation.
The subtropical monsoon climate is hot in summer and warm in winter, with four distinct seasons and developed monsoon. The average temperature in the hottest month is generally higher than 22℃, and the temperature in Leng Yue is between 0- 15℃. The annual precipitation is mostly 800- 1600 mm, and the precipitation in the second half of the year usually accounts for 70% of the whole year. It should be noted that the subtropical monsoon humid climate is similar to the subtropical monsoon climate, but it does not form a monsoon climate due to the differences in thermal properties between land and sea.
Subtropical monsoon climate appears on the east coast of subtropical continent, with latitude of 25-35, such as the area south of Huaihe River in Qinling Mountains and north of tropical monsoon climate in China. Some geoscientists also believe that Daba Mountain area is more suitable as the subtropical northern boundary of China than Qinling Mountain area.
Japan and the southern part of the Korean peninsula also have subtropical monsoon climate, but the monsoon climate in Japan and the Korean peninsula is influenced by the ocean, and its maritime characteristics are obvious.
Zhu Kezhen is a pioneer in the study of modern meteorology and climatology in China. In the Republic of China 10 (192 1), Zhu Kezhen became the head of the Department of Geography of the First Department of China, teaching meteorology, world climate and other courses.
In the 20th year of the Republic of China (193 1), Zhu Kezhen creatively divided China into eight climate zones according to the principles of simplicity, consistency with natural regions and consistency with atmospheric circulation. It is also believed that the work of natural zoning must also serve agricultural production. Under the leadership of Zhu Kezhen, China's comprehensive natural zoning is dominated by climatic factors, and the zoning is mainly the division of climatic zones.
As far as China is concerned, the zonal vegetation in Qinba Mountain area has changed obviously from south to north, mainly from evergreen broad-leaved forest belt to deciduous broad-leaved forest belt, so Qinba Mountain area is often regarded as the dividing line between subtropical and warm temperate climate, that is, the north-south dividing line. But where the dividing line is, it is very controversial. There are three mainstream views: the main ridge of Qinling Mountains, the southern slope of Qinling Mountains and the northern slope of Qinling Mountains.