Before 1985, the periodical phenomenon of AAAT changes in different years was apparent, and the periodicity was about 7-8 years.

• 引起年平均气温上升的主要原因是湿季气温的明显上升，这与湿季多云、空气湿度大和空气中烟尘含量增加等多方面因素的积加作用有关。