洞庭湖表层水温变化特征及其对气候变化的响应 洞庭湖表层水温变化特征及其对气候变化的响应

Based on the synchronized data of monthly average water temperature and air temperature at Chenglingji Station of Dongting Lake from 1991 to 2019, the intra-annual variations, the interannual variation trends, the periodicity characteristics of water temperature and air temperature were investigated by using the linear trend analysis and the wavelet analysis methods, and the response of water temperature changes to air temperature, precipitation, and wind speed changes was also discussed. The results showed a similar intra-annual variation pattern for the average water temperature and air temperature, which was the warming period ranged from January to August and the cooling period started from September to December. In the past 29 years, the annual average water temperature and air temperature exhibited an obvious warming trend, and increased at the rate of 0.35ºC/10a and 0.19ºC/10a, respectively. Meanwhile, the wavelet analysis revealed that average water temperature and air temperature in different seasons performed an oscillation period of 14 years. Overall, the strongest correlation between air temperature and water temperature indicated that climate change could be one of the main factors driving the variations of water temperature.