Climatic implications of δ13C variations in a Japanese cedar (Cryptomeria japonica) during the last two millenia
Climatic implications of δ13C variations in a Japanese cedar (Cryptomeria japonica) during the last two millenia
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过去两千年日本雪松 (Cryptomeria japonica) δ13C 变化的气候影响
DOI：
10.1029/95gl02066
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发表时间：
1995
影响因子：
5.2
通讯作者：
E. Matsumoto
中科院分区：
文献类型：
--
作者：
H. Kitagawa;E. Matsumoto
研究了现代日本雪松和日本南部屋久岛上生长了2000多年的巨型日本雪松的树轮δ 13 C。海拔320 ~ 1700 m的11株现代树木的δ 13 C值与树木生长高度有很强的相关性，从世纪后期到现在，δ 13 C值呈下降趋势。气候和大气CO2 δ 13 C的变化似乎对这些变化很重要。假定温度变化是影响δ 13 C-生长海拔关系的主要因素，则日本柳杉δ 13 C的温度依赖性为-0.29 ± 0.02 ‰ °C-1。将这种关系应用于巨大日本雪松的十年δ 13 C时间序列，我们重建了过去两千年的高分辨率气候记录。对树轮δ 13 C时间序列的最大熵谱分析表明，它与其他气候代用指标的相似之处，以及树轮Δ 14 C的特征周期性（约90年和近200年）的存在，这是由太阳对银河宇宙射线的调制所决定的。提出了太阳与气候关系的支持证据。
Tree-ring δ 13 C of both modern Japanese cedars, and of a giant Japanese cedar growing throughout the last two millennia on Yakushima Island, southern Japan, were studied. δ 13 C of eleven modern trees from 320 m to 1700 m above mean sea level revealed a strong dependency on tree growth-elevation and a decreasing trend from the late 19th century to the present. Changes in both climate and δ 13 C of atmospheric CO2 appear to be important for these changes. Assuming temperature change to be a dominant factor influencing δ 13 C-growth elevation relationship, we have inferred a temperature dependency of δ 13 C, -0.29 ± 0.02 ‰ °C -1 for Japanese cedar. Applying this relationship to a decadal-δ 13 C time series of a giant Japanese cedar, we reconstructed a high-resolution climatic record for the last two millennia. A maximum-entropy spectral analysis of the tree-ring δ 13 C time series revealed a resemblance of that of other climatic proxy, and the presence of the well-known periodicity (ca 90 and near 200 years), characteristic of tree-ring Δ 14 C, governed by solar modulation of galactic cosmic rays. Supporting evidence for a Sun-climate relationship was presented.