气象学报（英文版）2017，Vol.31Issue(1)：39-48,10.
Tree-Ring Latewood Width Based July–August SPEI Reconstruction in South China since 1888 and Its Possible Connection with ENSO
摘要
Abstract
Our understanding of the long-term hydroclimate variations in South China is prohibited by the shortness of me-teorological records. Paleoclimatic proxies, such as tree-rings, can be pursued to extend the meteorological records back for centuries to help us better understand hydroclimatic conditions. In this study, we reconstructed the July–Au-gust standardized precipitation–evapotranspiration index (SPEIJul–Aug) based on a newly developed 127-yr adjusted latewood width chronology fromTsuga longibracteata, South China. The chronology explained 40% of the actual SPEIJul–Aug variance in the period 1953–2014. The reconstructed SPEIJul–Aug can represent large-scale July–August SPEI variations over South China, including northern Guangxi, Hunan, and Guizhou provinces. From the perspec-tive of the past 127 years, the extreme summer drought in 2013 was not unusual because more extreme drought events occurred in the first half of the 20th century. A significant 2.0–3.6-yr hydroclimatic cycle existed in the recon-struction, which indicated that the SPEIJul–Aug might be driven by El Ni?o–Southern Oscillation (ENSO). We further checked the time-dependency of the relationship between SPEIJul–Aug and ENSO and found that it was unstable. Their relationship was weak before the 1950s, became significant from the 1950s to early 1990s, and then dropped to be weak again and even out of phase since the early 1990s, which may be attributable to the significant westward exten-sion of the western Pacific subtropical high.关键词
tree rings/adjusted latewood width/SPEI/South ChinaKey words
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..[J].气象学报（英文版）,2017,31(1):39-48,10.基金项目
Supported by the National Natural Science Foundation of China (41271210), Global Change Program (2016YFA0600503), Priority Academic Program Development of Jiangsu Higher Education Institutions, and Jiangsu Collaborative Innovation Center for Climate Change. （41271210）
