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树木环纤维素的氧气和氢同位素比，以及环境水域的同位素比率，以开发方法以重建过去几个世纪和千年中非常高的时间和空间分辨率的水周期变化，以重建过去的气候变化。在2005年，在北海道和中国西部分析了树环扣和环境水的同位素比之间的关系，该关系分别代表了北北北北部的夏季夏季相对湿度，分别代表了寒冷，潮湿和炎热的，干燥的环境，使用橡树树环纤维素重建了夏季相对湿度。 2006年，对日本长谷（Kamchatka）和赛普拉斯（Cypress）的落叶尔奇（Larch）的树环进行了调查，以分别重建过去的冬季温度和夏季相对湿度，以重建过去的冬季温度和夏季相对湿度。树木通常可以在夏季记录植物的光合作用活动的气候。但是，由于冬季降水仍可以在夏季保持，因为高纬度地区的土壤水覆盖着沉重的积雪，因此O和H同位素比可能具有冬季气候的信号。分析了180年的坎奇特卡落叶树环，发现树木环纤维素和2月和3月的温度的D诊断具有非常强的负相关性，这表明在过去的150年中，冬季温度的逐步升高，在kamchatka的降水状态和繁殖量不足，在林区的降水量不足，这是在林中的温度，它是在日本的温度上，是在Honshu的温度下，是在Honshu的温度下，是在HONSU的温度下，是在HONSU的温度下升高的，那里的过去气候。然而，发现柏树环的O同位素比在那里的夏季相对湿度方面有所不同，并且在过去260年中说明了夏季相对湿度的变化。