气候变化领域集成服务门户(CCPortal): A 2600-year summer climate reconstruction in central Japan by integrating tree-ring stable oxygen and hydrogen isotopes

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DOI	10.5194/cp-16-2153-2020
	A 2600-year summer climate reconstruction in central Japan by integrating tree-ring stable oxygen and hydrogen isotopes
	Nakatsuka T.; Sano M.; Li Z.; Xu C.; Tsushima A.; Shigeoka Y.; Sho K.; Ohnishi K.; Sakamoto M.; Ozaki H.; Higami N.; Nakao N.; Yokoyama M.; Mitsutani T.
发表日期	2020
ISSN	18149324
起始页码	2153
结束页码	2172
卷号	16 期号:6
英文摘要	Oxygen isotope ratios (δ18O) of tree-ring cellulose are a novel proxy for summer hydroclimate in monsoonal Asia. In central Japan, we collected 67 conifer wood samples, mainly Chamaecyparis obtusa, with ages encompassing the past 2600 years. The samples were taken from living trees, archeological wood, architectural wood, and buried logs. We analyzed stable isotope ratios of oxygen (δ18O) and hydrogen (d2H) in tree-ring cellulose in these samples (more than 15 000 rings in total) without using a pooling method and constructed a statistically reliable treering cellulose δ18O time series for the past 2500 years. However, there were distinct age trends and level offsets in the δ18O record, and cellulose δ18O values showed a gradual decrease as an individual tree matures. This suggested it is difficult to establish a cellulose δ18O chronology for lowfrequency signals by simple averaging of all the δ18O time series data. In addition, there were opposite age trends in the cellulose δ2H, and δ2H gradually increased with tree age. There were clear positive correlations in the short-periodicity variations between δ18O and δ2H, probably indicating a common climate signal. A comparison of the δ18O and δ2H time series in individual trees with tree-ring width suggested that the opposite age trends of δ18O and δ2H are caused by temporal changes in the degree of post-photosynthetic isotope exchange with xylem water (physiological effect), accompanied by changes in stem growth rate that are influenced by human activity in the forests of central Japan. Based on the assumptions that cellulose δ18O and δ2H vary positively and negatively with constant proportional coefficients due to climatological and physiological effects, respectively, we solved simultaneous equations for the climatological and physiological components of variations in tree-ring cellulose δ18O and δ2H in order to remove the age trend. This enabled us to evaluate the climatic record from cellulose δ18O vari ations. The extracted climatological component in the cellulose δ18O for the past 2600 years in central Japan was well correlated with numerous instrumental, historical, and paleoclimatological records of past summer climate at various spatial and temporal scales. This indicates that integration of tree-ring cellulose δ18O and δ2H data is a promising method to reconstruct past summer climate variations on annual to millennial timescales, irrespective of the growth environment. However, analytical and statistical methods need to be improved for further development of this climate proxy. © 2020 Author(s).
语种	英语
scopus关键词	cellulose; hydrogen isotope; oxygen isotope; paleoclimate; paleoenvironment; reconstruction; spatiotemporal analysis; stable isotope; summer; tree ring; Chamaecyparis obtusa; Coniferophyta
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153181
作者单位	Research Institute for Humanity and Nature, Kyoto, 603-8047, Japan; Graduate School of Environmental Studies, Nagoya University, Nagoya, 464-8601, Japan; Faculty of Human Sciences, Waseda University, Tokorozawa, 359-1192, Japan; Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China; Department of Architecture, Civil Engineering and Industrial Management Engineering, Nagoya Institute of Technology, Nagoya, 466-8555, Japan; Institute of Low Temperature Science, Hokkaido University, Sapporo, 060-0819, Japan; National Museum of Japanese History, Sakura, 285-8502, Japan; University Museum, University of Tokyo, Tokyo, 113-0033, Japan; Aichi Prefectural Center for Archaeological Operations, Yatomi, 498-0017, Japan; Research Center, Musashi University, Tokyo, 176-8534, Japan; Faculty of Science, Yamagata University, Yamagata, 990-8560, Japan; Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan; Nara Nationa...
推荐引用方式 GB/T 7714	Nakatsuka T.,Sano M.,Li Z.,et al. A 2600-year summer climate reconstruction in central Japan by integrating tree-ring stable oxygen and hydrogen isotopes[J],2020,16(6).
APA	Nakatsuka T..,Sano M..,Li Z..,Xu C..,Tsushima A..,...&Mitsutani T..(2020).A 2600-year summer climate reconstruction in central Japan by integrating tree-ring stable oxygen and hydrogen isotopes.Climate of the Past,16(6).
MLA	Nakatsuka T.,et al."A 2600-year summer climate reconstruction in central Japan by integrating tree-ring stable oxygen and hydrogen isotopes".Climate of the Past 16.6(2020).