tailieunhanh - Báo cáo lâm nghiệp: "Solar activity, global surface air temperature anomaly and pacific decadal oscillation recorded in urban tree rings"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Solar activity, global surface air temperature anomaly and pacific decadal oscillation recorded in urban tree rings. | Ann. For. Sci. 64 2007 743-756 INRA EDP Sciences 2007 DOI forest 2007054 Available online at Original article Solar activity global surface air temperature anomaly and pacific decadal oscillation recorded in urban tree rings Xingyuan HEa Zhenju CHENa Wei CHENa Xuemei SHAOb c HongS HEa d Yu SUNa a Institute of Applied Ecology Chinese Academy of Sciences 72 Wenhua Road Shenhe District Shenyang 110016 China b Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Jia 11 Datun Road Beijing 100101 China c Institute of Tibetan Plateau Research Chinese Academy of Sciences 18 Shuangqing Road Beijing 100085 China d School of Natural Resources University of Missouri Columbia USA Received 26 October 2006 accepted 10 May 2007 Abstract - A tree ring width chronology developed from 58 samples taken from Chinese pine trees Pinus tabulaeformis Carr. growing in Shenyang city was studied to analyze the effects of solar activity Global Surface Air Temperature Anomalies GSATA and the Pacific Decadal Oscillation PDO on annual radial growth. An excellent response of tree rings to solar activity and global environmental change was revealed indicating that these urban Chinese pine trees are a suitable proxy for Sun-Earth system research despite their location in Shenyang an industrial city. The information derived from annual growth rings of urban Chinese pine trees coincides with records from undisturbed trees in a natural location and demonstrates significant synchronous response to solar activity in the periodic bands of 5-8 10-12 and 20-30 years. The wave signal of tree growth was also affected and amplified by the combined effect of the PDO from 1900 to 2004 and GSATA from 1880 to 2004 with a short lag time revealing 5-8 11-13 and 20-23 year oscillatory modes. At 20-30 year timescale Chinese pines validated the strong GSATA influence signal at years and may be the primary cause of the 20 and 23 year periodic .