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Construction of a Millennial-long Chamaecyparis Dendrochronology for Centrarl Japan

日本中部千年扁柏树木年代学的构建

基本信息

批准号：
03806025
负责人：
SWEDA Tatsuo
金额：
$ 1.15万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

项目摘要

Logs of medieval and early modern origins survived from decay for some hundreds of years are still found sporadically in the Kiso Forests, Central Japan. The authenticity of their medieval origin is found in many huge Chamaecyparis trees regenerated on top of them some 300 years ago and are still mounted alive. In the present work some 200 such logs of medieval and early modern origin were excavated, and their dendrochronologies were crossdated against a 250-year-long modern chronology compiled from some 70 living Chamaecyparis individuals from the same area to establish an 800-year-long standard dendrochronology extending back into the 1100s A.D.An dendroclimatic analysis of this standard chronology with the modern instrumental climatic record revealed that the ring width is primarily correlated with winter temperature preceding growth and secondary with summer precipitation of the preceding growth period. Based on this relationship, the climate of central Japan was reconstructed for the past 800 years, in which the terminating phase of the medieval warm epoch, little ice age spanning from the mid 13th Century till mid 19th, and consistent warming trend continuing up to present were clearly identified.A comparison of the dendrochronology with the past records of volcanic eruptions showed definite decline right after such major eruptions that maked acid fallout in Antarctic and Greenland ice sheets, indicating climatic cooling by eruption which lasts for a couple of decades.

在日本中部的木曾森林中，仍然零星地发现有中世纪和近代早期的树木，这些树木在腐烂中存活了几百年。它们中世纪起源的真实性可以在大约300年前在它们上面再生的许多巨大的Chamaaparis paris树中找到，并且仍然活着。在目前的工作中，大约200个中世纪和现代早期的原木被挖掘出来，他们的树木年代学与一个250年的现代年代学交叉，该年代学是从同一地区的大约70个现存的Chamaopartisparis个体中编纂的，以建立一个800年的，一个长期的标准树木年代学，可以追溯到公元1100年。气候记录表明，年轮宽度主要与生长前期的冬季温度有关，其次与生长前期的夏季降水量有关。在此基础上，重建了日本中部近800年的气候，其中包括中世纪暖期的结束阶段，即从世纪中期到19世纪中期的小冰期，树木年代学与过去火山爆发记录的比较表明，在这种重大事件发生后，在南极和格陵兰冰盖上产生酸性沉降物的火山爆发，表明持续几十年的火山爆发使气候变冷。