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

Research Project

Project/Area Number 17310001
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Environmental dynamic analysis
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

NAKATSUKA Takeshi  Hokkaido Univ., Inst. Low Temp. Sci., Associate Prof., 低温科学研究所, 助教授 (60242880)

Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥15,500,000 (Direct Cost: ¥15,500,000)
Fiscal Year 2006: ¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2005: ¥12,200,000 (Direct Cost: ¥12,200,000)
KeywordsTree Ring / Cellulose / Precipitation Isotope Ratio / Oxygen Isotope Ratio / Hydrogen Isotope Ratio / Water Cycle / Climate Change / 年輪
Research Abstract

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.

Report

(3 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • Research Products

    (5 results)

All 2006

All Journal Article (5 results)

  • [Journal Article] δ^<18>O of tree-rings cellulose in two species (spruce and oak) as proxies of precipitation amount and relative humidity in Northern Janan2006

    • Author(s)
      Tsuji, H., T.Nakatsuka, K.Takagi
    • Journal Title

      Chemical Geology 231

      Pages: 67-76

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 樹木年輪セルロースの酸素同位体比による古気候の復元を目指して2006

    • Author(s)
      中塚 武
    • Journal Title

      低温科学 65

      Pages: 49-56

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] δ^<18>O of tree-rings cellulose in two species (spruce and oak) as proxies of precipitation amount and relative humidity in Northern Japan2006

    • Author(s)
      Tsuji, H., T.Nakatsuka, K.Takagi
    • Journal Title

      Chemical Geology 231

      Pages: 67-76

    • NAID

      130004592562

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Reconstruction of paleo-climate using tree-ring oxygen isotopic ratios2006

    • Author(s)
      Nakatsuka, T.
    • Journal Title

      Low Temperature Science (in Japanese) 65

      Pages: 49-56

    • NAID

      110006217578

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] δ^<18>O of tree-rings cellulose in two species (spruce and oak) as proxies of precipitation amount and relative humidity in Northern Japan2006

    • Author(s)
      Tsuji, H, T.Nakatsuka, K.Takagi
    • Journal Title

      Chemical Geology (In press)

    • NAID

      130004592562

    • Related Report
      2005 Annual Research Report

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Published: 2005-04-01   Modified: 2016-04-21  

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