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Early Warning Signals of Dry-Wet Transition in China in Recent 60 Years
WU Hao 1, 2, 3 , WANG Jinsong , HOU Wei , LI Yiping , WANG Ying 2
4
2
2
(1. Hunan Climate Center, Changsha 410118, Hunan, China;
2. Institude of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, Gansu, China;
3. Hunan Key Laboratory of Meteorological Disaster Prevention and Reduction, Changsha 410118, Hunan, China;
4. National Climate Center, Beijing 100081, China)
Abstract: In recent years, the dry-wet transition has become more and more frequent. The dry-wet transition is
related to the formation of regional flood, drought and other disaster events. It is a hot scientific issue in the cur‐
rent nonlinear dynamics research that how to effectively identify the dry-wet transition process and search for its
early warning signals. But at present, the identification of such transition process and its early-warning signal are
still lack of effective and in-depth research. Fortunately, the critical slowing theory shows great potential in the
study of early-warning signals of complex nonlinear dynamical systems. In view of this, based on the theory of
critical slowing down and the K drought index data of representative stations in 13 drought regions in China, the
early warning signals of dry-wet transition are investigated. Firstly, the time of dry-wet transition of the K
drought index series is determined by moving t-test. Then, the early warning signals of dry-wet transition are
studied by the variance and auto-correlation coefficient which represent the critical slowing-down phenomenon.
The results show that the K drought index series of representative stations in different drought regions have differ‐
ent degrees of dry-wet transition. The critical slowing-down phenomena with the increase of variance and auto-
correlation coefficient occur in each representative station within 10 years before the dry-wet transition, indicat‐
ing that the critical slowing-down phenomenon may be an early warning signal before the dry-wet transition. This
study proves the reliability of critical slowing-down theory as an early warning signal of mutation, and can pro‐
vide a theoretical and experimental basis for the wide application of this theory.
Key words: K drought index; critical slowing down; dry-wet transition; early warning signals