Resources Science ›› 2019, Vol. 41 ›› Issue (1): 152-163.doi: 10.18402/resci.2019.01.14

• Orginal Article • Previous Articles     Next Articles

Temporal and spatial variation characteristics of annual temperature in China's first-level basin

Bin WANG(), Peng LI, Guoce XU(), Yuting CHENG, Binhua ZHAO, Fang WEI   

  1. State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an 710048, China
  • Received:2017-11-07 Online:2019-01-25 Published:2019-01-25

Abstract:

Temperature is one of the main factors causing the difference between the natural landscape and the ecological environment. Based on the annual temperature data of 735 meteorological stations during the period from 1951 to 2013 in China's first-level basin, the relative difference method, Hurst index and other methods were employed to identify the temporal and spatial variation characteristics of annual temperature. The results illustrated that the annual temperature in China generally showed a significant upward trend, but the annual temperature in the middle of the Yangtze River region did not change significantly. The whole China, Liao River, Hai River and Huai River, Yellow River, Yangtze River, Southwest River, Southeast River, and Pearl River region all existed the best representative meteorological sites for annual temperature. The best representative meteorological sites were Tieganlike, Zhangwu, Laoting, Heze, Haiyuan, Jinggangshan, Jiacha, Wuyishan, and Liuzhou, respectively. The main period of annual temperature change in first-level basin regions in China is approximately 40~50 years. The last 20~30 years were the warmer period, Hurst index analysis showed that the temperature will continue to rise in future for the most parts of China. The annual temperature and the annual precipitation near the connection of “Harbin-Beijing-Shijiazhuang-Xi'an-Chongqing-Guiyang” exhibited a (highly) significant negative correlation. The connection is close to “Hu Line.” The study of the climate near “Hu Line” is of great significance to the ecological environment protection and the Belt and Road strategy of our country. The Hurst index analysis, Mann-Kendall test, and Morlet wavelet analysis of the annual temperature series demonstrate that the best representative meteorological stations can reflect the regional annual temperature trends and major cyclical changes. The method of estimating the annual average temperature of a region using the annual temperature of a representative meteorological site is meaningful. The method is also of great significance for rapid assessment of regional mean annual precipitation and scaling scales.

Key words: first-level basin, the best representative meteorological sites, temperature, temporal and spatial variation