Is the subtropics moving northward?

According to the meteorological observation data of 658 stations in China 198 1~20 10, the number of days when the daily average temperature is stable ≥ 10℃, the annual dryness and the average temperature in July are the main indicators to divide the temperature zone, the dry and wet zone and the climatic zone, and the annual average temperature of 1 0. According to the multi-year average of accumulated temperature and extreme minimum temperature with stable daily average temperature ≥ 10℃, the climatic conditions from 198 1 0 to 20 10 in China are divided into 12 temperature zones, 24 dry and wet zones, 56 climatic zones and 65438+. Under the influence of climate warming, the boundaries of several temperature zones in eastern China moved northward from 198 1 to 20 10, in which the eastern part of the northern boundary of warm temperate zone moved northward above 1 latitude, the eastern part of the northern boundary of north subtropical zone moved northward on average 1 latitude, and the central part of the northern boundary of middle subtropical zone moved northward by 2 latitude, north and south. At the same time, due to the decrease of precipitation in North China, Southeast Northeast China and East Northwest China, the boundary of semi-arid and semi-humid areas in the north moved eastward and southward, with the moving range of 36 ~ 4 1 N reaching 0.5~2.5 longitude. However, the northwest Hexi Corridor, Xinjiang and the arid and semi-arid areas of the Qinghai-Tibet Plateau generally turned wet.