Reconstructing Typhoons in Southeast Coastal Areas during Ming and Qing Dynasties and Analyzing the Factors

Through systematically sorting out the historical data such as the chronicles of prefectures and counties, 1 180 typhoon disasters in the southeast coastal areas during Ming and Qing Dynasties are reconstructued and the frequency sequence of typhoon disasters is established. The temporal and spatial distribution of typhoon disasters in the region and their main factors are analyzed. The results are as follows. The impacts of typhoons concentrate in the coastal areas and decrease from the coastal areas to the inland. The decay of typhoons is a rapid process. The area most seriously affected by the typhoons is South China, of which Guangdong Province suffers the most. The factors for typhoons include temperature changes and sunspot. When temperature changes are stable, the typhoon frequency changes smoothly. The typhoon frequency shows great turbulence when temperature fluctuations are steep. When the sunspot cycle is at a low activity value, the subtropical high pressure moves northward, and the influence of typhoon in the southeast coastal areas increases. When the sunspot cycle enters an active period, the subtropical high pressure moves southward, and the influence of typhoons in the southeast coastal areas decreases.