2024-03-29T08:25:07Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00011658
2023-11-13T06:06:08Z
879:1183:1184:1237
Reconstruction of climate changes using tree-ring data of of Japanese cypress grown in the southern coastal region of Lake Biwa
琵琶湖南岸地域のヒノキ年輪データによる気候変動再現の試み
庄, 建治朗
81205
Sho, Kenjiro
81206
高橋, 浩
81207
Takahashi, Hiroshi Aoki
81208
中村, 俊夫
81209
Nakamura, Toshio
81210
2001-03
We investigated that the climatic factors controlling the stable carbon isotopic composition and tree-ring width of annual rings of Japanese Cypress (Chamaecyparis obtusa), and moreover, attempted to reconstruct climatic changes for ca. 300 years using the relationship between tree-ring data and climatic factors. 50 grubs with more than 100 rings, which were collected at the southern coastal region of Lake Biwa, were used for ring-width analysis and 5 grubs were used for isotopic analysis. The δ^<13>C values of annual rings from 1936 to 1987 were measured in the all five samples. There was little spatial δ^<13>C variation of annual rings within a radius of 15km in the present study area, since the correlation coefficients in interzonal comparison (r=0.52 to 0.77) were identical with those of the individual variations in one forest (r=0.40 to 0.75). This result suggested that the δ^<13>C values of annual rings were mainly influenced by the extensive environmental factors at least 30km. The δ^<13>C fluctuations of annual rings from the secular trends and ring-width indices were compared with the monthly meteorological data, i.e., temperature, precipitation, number of precipitation days and sunshine duration. As resuls, the δ^<13>C chronology showed the best correlation with sunshine duration (positive, r=0.36) and number of precipitation days (negative, r=-0.32) in early summer, and the ring-width indices showed the best correlation with temperature in early spring (positive, r=0.25), precipitation in early summer (negative, r=-0.30) and sunshine duration in previous winter (positive, r=0.26). Subsequently, fluctuation of precipitation and number of precipitation days in early summer (May-June), whih showed high correlation with both δ^<13>C and ring-width indices, were reconstructed for the interval of 1727-1994 from the two chronologies of tree-ring data using multiple regression analysis. The estimated chronologies of the climate factors matched with the observed data in secular trends except for the interval of 1950-70's, in which annual rings of the samples were probably trongly affected by nonclimatic environmental factors such as air pollution.
タンデトロン加速器質量分析計業績報告 Summaries of Researches Using AMS 2000 (平成12)年度
departmental bulletin paper
名古屋大学年代測定資料研究センター 天然放射性元素測定小委員会
2001-03
名古屋大学加速器質量分析計業績報告書
12
193
204
jpn
http://ci.nii.ac.jp/naid/110000475695/
名古屋大学年代測定資料研究センター 天然放射性元素測定小委員会
本文データは学協会の許諾に基づきCiNiiから複製したものである