Development of large scale mapping method of precipitation isotopic ratios using tree-ring cellulose oxygen and hydrogen isotopic ratios

开发利用树木年轮纤维素氧和氢同位素比的降水同位素比的大比例尺绘图方法

基本信息

批准号：
17310001
负责人：
NAKATSUKA Takeshi
金额：
$ 9.92万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17310001/
关键词：
Tree Ring Cellulose Precipitation Isotope Ratio Oxygen Isotope Ratio Hydrogen Isotope Ratio Water Cycle Climate Change 年輪

项目摘要

Oxygen and hydrogen isotopic ratios of tree-ring cellulose were monitored at several sites in Japan, Russia and China together with those isotopic ratios of environmental waters in order to develop methods to reconstruct past-climate changes especially changes of water cycles in very high time and space resolutions during last several centuries and millenniums. In 2005, relationships between isotopic ratios of tree-ring clullose and environmental waters were analyzed in Hokkaido and western China, which represents cold, humid and hot, dry environments, respectively, and 230 years of summer relative humidity in northern Hokkaido were reconstructed using oak tree-ring cellulose. In 2006, tree rings of larch in Kamchatka, Russia and cypress in Nagano, Japan were investigated for their oxygen and hydrogen isotopic ratios in order to reconstruct past winter temperature and summer relative humidity, respectively.Tree rings can usually record the climate in summer during which photosynthetic activity of plant is most active. However, as winter precipitation can remain even in summer as soil water in the high latitudinal area with heavy snow cover, tree-ring O and H isotopic ratios may hold signals of winter climate. 180 years of larch tree rings in Kamchatka were analyzed and the d-exess values of tree-ring cellulose and temperature of Feb. and Mar. were found to have very strong negative correlation, which demonstrated the stepwise increase of winter temperature there during last 150 years.Contrary to Kamchatka, it is very warm and humid in Honshu Japan, where tree growths are not usually limited by precipitation or temperature and tree ring width does not hold signal of past climate there. However, the O isotopic ratios in cypress tree rings were found to vary corresponding to summer relative humidity there, and changes in summer relative humidity were illustrated during last 260 years.

在日本、俄罗斯和中国的多个地点监测了树木年轮纤维素的氧和氢同位素比以及环境水的同位素比，以便开发重建过去气候变化的方法，特别是在非常长的时间和时间内水循环的变化。过去几个世纪和几千年的空间分辨率。 2005年，分析了北海道和中国西部分别代表冷、湿和热、干环境的树木年轮粗纤维同位素比值与环境水体的关系，并利用橡树重建了北海道北部230年的夏季相对湿度树轮纤维素。 2006年，对俄罗斯堪察加半岛的落叶松和日本长野的柏树的年轮进行了氧和氢同位素比的调查，以分别重建过去的冬季温度和夏季相对湿度。年轮通常可以记录夏季的气候。其中植物的光合作用活动最活跃。然而，由于高纬度地区大雪覆盖的土壤水，冬季降水即使在夏季也能持续存在，树木年轮O和H同位素比值可能蕴藏着冬季气候的信号。对堪察加半岛180年的落叶松年轮进行分析，发现树轮纤维素的d-exess值与2月和3月的温度具有很强的负相关性，这表明近150年来该地区冬季温度呈阶梯式上升。与堪察加半岛相反，日本本州岛非常温暖和潮湿，树木的生长通常不受降水或温度的限制，树轮宽度也无法反映那里过去的气候。然而，人们发现柏树年轮中的 O 同位素比率随夏季相对湿度而变化，并说明了过去 260 年夏季相对湿度的变化。