Interannual variability of average minimum temperatures derived from tree rings in the mid-Qinling Mountains, China, for the past 138 years

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• 作者：Ying Lei ; Yu Liu ; Bo Sun ; Changfeng Sun
• 关键词：TTH ; Mid ; Qinling Mountains ; Picea asperata ; Average minimum temperatures ; Reconstruction
• 刊名：International Journal of Biometeorology
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：60
• 期：10
• 页码：1519-1529
• 全文大小：1,831 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Life Sciences
  Animal Physiology
  Plant Physiology
  Environmental Medicine/Environmental Psychology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1254
• 卷排序：60

文摘

In this study, spruce tree rings from the southern slope of mid-Qinling Mountains were adopted to investigate the characteristics of average minimum temperatures during the past 138 years. Analysis showed that the interannual variability in radial growth of trees was positively correlated with the interannual variability of average minimum temperatures from previous December to current September (VTM_DS) in the study area during 1955–2010 ad. Based on the correlation analysis, the VTM_DS were reconstructed for 1876–2013 ad with an explained variance of 42.5 % for the calibration period. Among the 22 dramatic changing years, extreme changes occurred more times when it was cooling, while the warming was comparatively gentle. Both the 10-year filtering of VTM_DS series and the frequency of occurrences for those dramatic changing years showed a relatively stationary variation after the early 1950s. Over the last five decades, the accumulated VTM_DS series showed an obvious warming trend, and the increase of the minimum temperature had contributed to the regional warming. The comparison of VTM_DS and the dryness/wetness indices generally reflected cold-wet and warm-dry climate conditions in the study area. Significant positive correlations between the reconstructed VTM_DS and the gridded minimum temperature indicated a regional representative of the temperature reconstruction, and positive correlations between VTM_DS and sea surface temperature (SST) of the Indian Ocean and western Pacific regions suggested a possible linkage between the VTM_DS variations and the Asian summer monsoon. Synchronous fluctuations in three tree-ring study series and connections of VTM_DS with Arctic oscillation (AO) and El Niño-Southern Oscillation (ENSO) activities suggested that the minimum temperature variations in the TTH area responded sensitively to large-scale climate fluctuations and were the results of atmosphere-ocean interactions.