Acta Geographica Sinica ›› 2012, Vol. 67 ›› Issue (5): 621-630.doi: 10.11821/xb201205005

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Regional Climate and Its Change in the Nujiang River Basin

FAN Hui, HE Daming   

  1. Asian International Rivers Center of Yunnan University, Yunnan Key Laboratory of International Rivers and Transboundary Eco-security, Kunming 650091, China
  • Received:2011-12-14 Revised:2012-03-06 Online:2012-05-20 Published:2012-05-20
  • Supported by:
    National Natural Science Foundation of China, No.41061010; National Science and Technology Support Program, No.2011BAC09B07; Applied Basic Research Foundation of Yunnan Province, No.2010zc002

Abstract: Long time series of monthly air temperature and precipitation data, which were recorded at 16 meteorological observation stations in the Nujiang River basin and its adjacent areas, were employed to analyze spatial distributions and changes of these meteorological elements in this basin during the past decades. In this research, TFPW-MK (Trend-free Pre-whitening Mann-Kendall) test and BFAST (Breaks For Additive Seasonal and Trend) were used to determine trends in climate data and to detect abrupt changes within the trend and seasonal components, respectively. The results show that air temperature and precipitation increased southward along the Nujiang River and heavily negatively correlated with altitude. The regional difference in PCD was obvious and higher PCD values, more than 60%, were observed in the Nujiang River basin in Tibet Autonomous Region. Precipitation-concentration time (PCT) in the study area (except for Gongshan) mainly from late July to late August. Generally speaking, the Nujiang River basin has become warmer in the past decades. The annual mean air temperature increases at a rate of 0.36 ℃/10a.

Key words: climate change, Mann-Kendall test, change point analysis, highland regions