Abstract
Drought is one of the most costly natural disasters in the world. Understanding the drought characteristics in space and time will help deepen our apprehension of the drought formation and evolution mechanisms. It can also contribute to design monitoring system for drought warning and mitigation. In this study, we analyzed meteorological droughts, using the Standardized Precipitation Index, for Lancang River Basin, Southwest China. The 46-year (1960–2005) daily precipitation observations from 35 meteorological stations in the basin were used to derive the drought index. Spatial patterns and temporal patterns of the drought characteristics at multiple scales were investigated. The results utilizing the Principal Component Analysis and K-means clustering methods suggest that the study area can be divided into four sub-regions geographically with each sub-region having its own distinctive temporal evolution patterns of droughts. The temporal variability of droughts was investigated using the Empirical Mode Decomposition (EMD) analysis and the wavelet method. The EMD analysis showed that more than 60 % of the variance of the drought is associated with intra-decadal fluctuations in precipitation, except for one sub region, represented by the Changdu station. The wavelet transform showed an evolution of the main cycle near 3–7 years for most parts of the study area.
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Acknowledgments
This work is supported jointly by National Basic Research Program of China (2010CB428403, 2010CB950904 and 2009CB723906), the Project of Natural Science Foundation of China (41171286), the Knowledge Innovation Program (KZCX2-YW-326-1) and the 100 Talents Program of the Chinese Academy of Sciences and the Ministry of Science and Technology Special Foundation Work (2008FY110300-01).
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Li, B., Su, H., Chen, F. et al. The changing pattern of droughts in the Lancang River Basin during 1960–2005. Theor Appl Climatol 111, 401–415 (2013). https://doi.org/10.1007/s00704-012-0658-2
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DOI: https://doi.org/10.1007/s00704-012-0658-2