| Weather and Climate |
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| A New Approach for Preserving Low-frequency Climate Variability from Millennium-long Tree-ring Chronology |
| HUANG Kai, YANG Bao |
| Key Laboratory of Desert and Desertification, Cold and Arid Regions Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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Abstract We presented a new chronology development method which was named Regional Growth Curve Standardization (RGCS), and introduced detailed procedures of this methodology used in Qilian juniper tree-ring samples from the middle Qilian Mountains in northwestern China. The chronology was compared with standardization (STD) and Regional Curve Standardization (RCS) chronologies with a length of 1 400 years. Compared with the RCS method, the RGCS considers the disturbances originating from climatic variations in different time periods in detrending process. The RGCS is superior to the RCS with respect to its preserving low-frequency climate variability, although this improvement is not very significant. Comprehensive analysis indicates that RGCS chronology is better at responding to temperature variations than the STD and RCS chronologies.
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Received: 18 February 2011
Published: 20 May 2012
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2012, Vol. 32 
