Publishing type：Research paper (scientific journal)   Publisher：Copernicus GmbH  

Abstract. Oxygen isotope ratios (δ18O) of tree-ring cellulose and historical documentary records are widely used to explore the hydroclimatic conditions of the past. In this study, we attempted to reconstruct chronologies of local climate disasters spanning 4 centuries in central Japan using these proxy data. For tree-ring δ18O measurements, we prepared cellulose samples from a long-living cedar tree with continuously broad ring widths. To enhance the temporal resolution, we divided each annual ring into several (mainly six) segments. Analysis of the correlations with observed relative humidity and precipitation data revealed that the intra-ring δ18O variations in the sample tree reflected the hydroclimatic conditions from April to July in each year. Subsequently, we chronologically listed the occurrence of eight types of disasters in the 17th to 19th centuries in the area adjacent to the sample tree according to 20 titles of “Town/City history”, which is a compilation of historical documentary records from the local municipality. By comparison with the intra-ring δ18O data, we found that most of the major droughts and long rains recorded in the historical documents occurred in the Baiu rainy season (typically June–July) or pre-Baiu season, corresponding to the growing season of the sample tree. Based on an analysis of the intra-ring δ18O variation for documentary-based drought and long-rain years, we set thresholds of intra-ring δ18O values to identify and extract drought and long-rain years. Drought and long-rain chronologies obtained by applying these thresholds were temporally continuous, complementing those based on documentary records. They depicted the relationships between the frequency of these climate disasters and the occurrence of major famines and the long-term tendency of length and magnitude of the Baiu rainy season in historical times.

DOI： 10.5194/cp-21-133-2025

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.quascirev.2024.108861

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Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Cambridge University Press (CUP)  

Abstract

We present an annual-resolution, millennium-long tree-ring chronology for northern Japan. The chronology is based on 5309 measurements of tree-ring δ¹⁸O from 37 samples of Hiba arbor-vitae (Thujopsis dolabrata var. hondae). Although the exact geographical origin of 27 of the samples is unknown because they were extracted from excavated archaeological material, pattern matching of the tree-ring δ¹⁸O variations was robust among all 37 samples. The floating chronology constructed using all samples was cross-dated against a previously published δ¹⁸O chronology from central Japan, yielding a correlation coefficient of 0.26 (t = 9.0; p < 0.01), resulting in a temporal coverage of 417–1595 CE (i.e., 1179 yrs). The global ¹⁴C spike event at 774–775 CE was clearly recorded in the annual ¹⁴C data, which provides independent support for the dating of tree rings using oxygen isotopes. Furthermore, this δ¹⁸O chronology from northern Japan was used to successfully cross-date a wood sample buried during the “Millennium Eruption” of Baitoushan, which is located on the border between China and North Korea.

DOI： 10.1017/rdc.2024.55

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Publishing type：Research paper (scientific journal)   Publisher：Frontiers Media SA  

The Republic of Korea is characterized by its north-to-south stretch and high mountain ranges along the eastern coast, resulting in terrain with higher elevation in the east and lower in the west. These geographical features typically lead to regional climate differences, either based on latitude or from east to west. In the present study, for effectiveness, the entire Korean peninsula was divided into four regions based on the geographical features: The Northeast Coast (NEC), Central Inland (MI), Southeast Coast (SEC), and South Coast (SC). Two test sites were chosen from each region, except for the SC. The linear relationship between the altitude of sites and the mean oxygen isotope ratio (δ¹⁸O) revealed a negative correlation; the highest (1,447 m a.s.l.) and the lowest altitude (86 m a.s.l.) sites had a mean δ¹⁸O of 27.03‰ and 29.67‰, respectively. The sites selected from the same region exhibited stronger correlation coefficients (0.75–0.79) and Glk (Gleichläufigkeit) (74–83%) between the tree-ring oxygen isotope chronologies (δ¹⁸O_TR chronologies) than those from different regions (0.60–0.69/70–79%). However, subtle variations in pattern were observed in the comparison period during a few selected intervals (approximately 10 years). All the regional δ¹⁸O_TR chronologies exhibited positive correlations with either June or July temperatures over Korea, whereas negative correlations with regional summer precipitation and SPEI-3. Moreover, the chronologies showed notable negative correlations with the water condition of western Japan. The findings of this study can be used as a scientific reference for the study of variations of rainfall in East Asia using δ¹⁸O_TR chronology.

DOI： 10.3389/ffgc.2024.1269346

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Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

Abstract

Tree-ring width (RW), density, elemental composition, and stable carbon and oxygen isotope (δ¹³C, δ¹⁸O) are widely used as proxies to assess climate change, ecology, and environmental pollution; however, a specific pretreatment has been needed for each proxy. Here, we developed a method by which each proxy can be measured in the same sample. First, the sample is polished for ring width measurement. After obtaining the ring width data, the sample is cut to form a 1-mm-thick wood plate. The sample is then mounted in a vertical sample holder, and gradually scanned by an X-ray beam. Simultaneously, the count rates of the fluorescent photons of elements (for chemical characterization) and a radiographic grayscale image (for wood density) are obtained, i.e. the density and the element content are obtained. Then, cellulose is isolated from the 1-mm wood plate by removal of lignin, and hemicellulose. After producing this cellulose plate, cellulose subsamples are separated by knife under the microscope for inter-annual and intra-annual stable carbon and oxygen isotope (δ¹³C, δ¹⁸O) analysis. Based on this method, RW, density, elemental composition, δ¹³C, and δ¹⁸O can be measured from the same sample, which reduces sample amount and treatment time, and is helpful for multi-proxy comparison and combination research.

DOI： 10.1007/s11676-024-01707-9

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Other Link： https://link.springer.com/article/10.1007/s11676-024-01707-9/fulltext.html

Publishing type：Research paper (scientific journal)   Publisher：The Korean Society of Conservation Science for Cultural Heritage  

The main content of dendroarchaeology is to assign the exact calendar year to each tree ring in archaeological wood. Each tree ring can be assigned a year because the pattern of ring-width time series (hereafter, ring-width chronology) is unique for each time period and the same tree species share the pattern. However, the lack of agreement between ring-width chronologies of <i>Pinus thunbergii</i> compared to other tree species makes it difficult to use the chronologies for dating. This study was conducted to verify the dating possibility of archaeological woods using tree-ring δ<sup>18</sup>O time series (hereafter, tree-ring δ<sup>18</sup>O chronology) instead of ring-width chronology. For the study, 7 <i>P. thunbergii</i> were selected from coastal dunes, and the ring-width and tree-ring δ<sup>18</sup>O chronologies were compared. The results showed that the agreement between ring-width chronologies were large statistical deviations (<i>t</i>-value: 0.6~12.5 / G value: 38~70%) as much as difficult for dating. On the other hand, the tree-ring δ<sup>18</sup>O chronologies showed reliable agreement between them as statistically (<i>t</i>-value: 4.3~6.4 / G value: 77~84%) and visually. Based on the results, it has been verified that the dating possibility of archaeological woods for <i>P. thunbergii</i>, which is a difficult tree species for dating in dendrochronology, can be greatly improved if the tree-ring δ<sup>18</sup>O chronology is applied.

DOI： 10.12654/jcs.2023.39.3.10

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Other Link： http://e-jcs.org/journal/view.php?doi=10.12654/JCS.2023.39.3.10

Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.scitotenv.2023.164640

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

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Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Cambridge University Press (CUP)  

ABSTRACT

We present two new millennium-long tree-ring oxygen isotope chronologies for central and northern Japan, based on 9693 annually resolved measurements of tree-ring oxygen isotopes from 39 unearthed samples consisting mainly of Japanese cedar (Cryptomeria japonica). These chronologies were developed through cross-dating of tree-ring widths and δ¹⁸O data from multiple samples covering the periods 2349–1009 BCE (1341 yr) and 1412–466 BCE (947 yr) for central and northern Japan, respectively. In combination with our published chronology for central Japan, the tree-ring δ¹⁸O dataset currently available covers the past 4354 yr (2349 BCE to 2005 CE), which represents the longest annually resolved tree-ring δ¹⁸O dataset for Asia. Furthermore, the high-resolution temporal record of ¹⁴C contents independently developed by Sakurai et al. (2020) was reproduced by our ¹⁴C measurements of earlywood and latewood in annual rings for the period 667–660 BCE.

DOI： 10.1017/rdc.2023.29

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Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Cambridge University Press (CUP)  

ABSTRACT

Regional offsets from Northern Hemisphere radiocarbon (¹⁴C) calibration curves are widely recognized for monsoon Asia and often hinder accurate ¹⁴C dating. In this paper, we explore the possible linkage between summer monsoon intensity and ¹⁴C offsets using tree-ring δ¹⁸O and ¹⁴C data from Thailand. We developed a 297-yr floating tree-ring δ¹⁸O chronology comprising seven teak log-coffin samples from the Ban Rai rock shelter site, northwestern Thailand. The outermost ring of our chronology was estimated to date from 358–383 CE, within a 95.4% (2σ) probability range, based on a total of 10 ¹⁴C measurements that were wiggle-matched against a mixed calibration curve evenly weighted from the IntCal20 and SHCal20 curves. Backward trajectory analysis showed that an intensified (weakened) summer monsoon detected in a modern tree-ring δ¹⁸O chronology was most likely to be induced by increased (decreased) air mass transport from the tropical Indian Ocean, which is an area of intense upwelling where the ¹⁴C concentration is lower than the atmospheric ¹⁴C level. However, partly because of the limited sample size and dating uncertainty, the direct linkage between the tree-ring δ¹⁸O series and ¹⁴C records obtained from our teak log-coffin samples could not be statistically verified.

DOI： 10.1017/RDC.2023.14

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Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

Abstract

The El Niño-Southern Oscillation (ENSO) used to affect the Asian summer monsoon (ASM) and Australian summer monsoon (AusSM) precipitation in different ways but global warming may have changed it. This study built robust annual ASM (AusSM) precipitation reconstructions during 1588–2013 (1588–1999) to examine the ENSO-monsoon relationship and how it has changed. During the period of 1588–1850 when natural climate variability was dominant, the ENSO-monsoon and inter-monsoon relationship was weak and non-stationary. Since 1850, however, both the inter-monsoon and ENSO-monsoon relationships saw an enhancement and this trend has been persistent to the present day, suggesting the influence of anthropogenic climate warming. Further analysis of climate model projections found that global warming can strengthen the ENSO-monsoon association that, subsequently, acts to synchronize the ASM and AusSM variations.

DOI： 10.1038/s41612-023-00341-2

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Other Link： https://www.nature.com/articles/s41612-023-00341-2

Authorship：Last author  

DOI： 10.18926/64199

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier {BV}  

DOI： 10.1016/j.scitotenv.2022.159437

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Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.jasrep.2022.103626

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier {BV}  

DOI： 10.1016/j.agrformet.2021.108687

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.quascirev.2021.107156

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Publishing type：Research paper (scientific journal)   Publisher：Cambridge University Press (CUP)  

<title>Abstract</title>
We drilled an 81.2-m-long ice core in the accumulation area (5860 m a.s.l.) of Trambau Glacier in the Rolwaling region during October–November 2019. The drilling operation was conducted with a lightweight electro-mechanical drill system after two reconnaissance fieldworks in 2017 and 2018, during which two shallow firn cores were drilled with a hand auger. The drill system and ice core samples were transported by helicopters at a high elevation of 6000 m a.s.l. A further challenging issue was the ice core transportation between Nepal and Japan, as no regular commercial flight was available for the frozen samples. The addition of dry ice imported from India immediately prior to leaving Nepal allowed the ice core samples to be successfully transported to a cold room in Japan, and remain in a frozen state. Stratigraphic observations during the drilling operation suggest the drill site has been affected by melting and refreezing.

DOI： 10.1017/aog.2021.15

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Erosion Control Engineering  

Establishing chronologies for large-scale landslides is crucial to understand the cause of the mass movements and to take measures against potential hazards in future. We discuss the applicability of dating methods for determining landslide chronologies in relation to the type of samples and the stratigraphic setting of sampling location. Case studies are carried out with fossil wood samples buried in the deposits of large-scale landslides in two areas of the Japanese Alps region in historic times ; Dondokosawa rock avalanche (DRA) and Ohtsukigawa debris avalanche (ODA). Ages are determined by accelerator mass spectrometry radiocarbon dating and dendrochronological analysis using the oxygen isotope composition of tree ring cellulose. We report seven radiocarbon ages and five dendrochronology data for the wood samples taken from outcrops and excavated trenches in the lacustrine sediments of dammed lakes formed by DRA, and two radiocarbon ages and two dendrochronology data for wood samples of ODA. Two sets of data for DRA are crosschecked independently to ensure the accuracy of results. Most of ages in the DRA area are concordant with the period of AD 887 Ninna (Goki-Shichido) mega-earthquake as proposed in previous studies. In the ODA area, ages are not concentrated in a specific period. When the preservation condition of buried wood trunks is good enough to date the exact or approximate tree-death years dendrochronologically, it is possible to estimate landslide occurrence periods in further detail by comparing the landslide chronology with historical records of heavy rainfall and large earthquakes.

DOI： 10.11475/sabo.73.5_3

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.5194/cp-16-2153-2020

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DOI： 10.5194/cp-2020-6

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Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jhydrol.2020.125522

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Publishing type：Research paper (scientific journal)  

DOI： 10.1186/s10086-020-01901-3

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DOI： 10.1017/qua.2020.28

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Publishing type：Research paper (scientific journal)  

DOI： 10.1038/s41598-020-66001-0

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Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s00704-019-03036-y

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Authorship：Lead author,　Corresponding author   Publishing type：Part of collection (book)   Publisher：Springer International Publishing  

DOI： 10.1007/978-3-030-29684-1_14

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Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.scitotenv.2019.01.186

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DOI： 10.5026/jgeography.128.49

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Publishing type：Research paper (scientific journal)  

DOI： 10.1029/2018GL081458

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Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.scitotenv.2019.06.268

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Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.dendro.2019.125626

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Copernicus GmbH  

DOI： 10.5194/cp-14-653-2018

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Verlag  

DOI： 10.1007/s00382-018-4212-5

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier B.V.  

DOI： 10.1016/j.quageo.2017.12.004

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DOI： 10.1080/10256016.2018.1495203

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Authorship：Lead author,　Corresponding author  

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DOI： 10.3759/tropics.MS17-09

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Publishing type：Research paper (scientific journal)  

DOI： 10.1002/joc.5859

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.dendro.2018.09.010

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DOI： 10.2343/geochemj.2.0543

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1080/16000889.2017.1391663

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.gloplacha.2017.08.009

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1038/sdata.2017.88

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer New York LLC  

DOI： 10.1007/s00484-017-1365-6

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Publishing type：Research paper (scientific journal)   Publisher：Copernicus {GmbH}  

DOI： 10.5194/cp-2016-132

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Language：Korean   Publishing type：Research paper (scientific journal)   Publisher：Korean Society of Wood Science Technology  

DOI： 10.5658/WOOD.2017.45.5.661

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s00468-015-1320-2

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/2015JD023610

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Language：Japanese  

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jhydrol.2015.02.037

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s10584-015-1413-3

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.chemgeo.2014.11.019

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2343/geochemj.2.0336

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2343/geochemj.2.0312

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s00382-012-1611-x

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/2013JD019803

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.palaeo.2013.06.025

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/jgrd.50664

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Language：English  

DOI： 10.1038/ngeo1834

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1177/0959683611430338

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1029/2012JD017749

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Publishing type：Research paper (scientific journal)   Publisher：Past Global Changes ({PAGES})  

DOI： 10.22498/pages.20.2.93

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Publishing type：Research paper (scientific journal)   Publisher：Past Global Changes ({PAGES})  

DOI： 10.22498/pages.20.2.72

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1029/2011JD016694

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Publishing type：Research paper (scientific journal)   Publisher：Past Global Changes ({PAGES})  

DOI： 10.22498/pages.19.1.38

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s10310-010-0183-z

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1073/pnas.0910827107

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.dendro.2009.05.005

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s00382-008-0454-y

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s10310-009-0123-y

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publisher：Japanese Forestry Society  

In order to evaluate the dendroclimatological potential of Fokienia hodginsii growing in montane forests of the Indochina Peninsula, increment core tree-ring samples were collected from 40 individual trees of F. hodginsii from northern Vietnam. Subsequent dendrochronological analysis revealed that ring-width growth was very uneven depending on radial direction with frequent wedging and missing rings. These difficult features hindered the cross-dating of some of the rings in 29 sample trees. However, the remaining 11 trees were not only precisely cross-dated but also revealed significant correlations in ring width among them. The established site chronology based on those 11 trees dates back to AD 1444, resulting in the longest ever made in Southeast Asia. Response analysis of tree-ring width with climate records revealed that hot weather and/or insufficient precipitation during the previous monsoon and current pre-monsoon seasons suppressed radial growth. With isolated but possibly wide natural distribution of Fokienia throughout the northern part of the Indochina Peninsula, Laos, southern China and possibly Myanmar, continued effort toward the development of tree-ring network would lead us to reconstruction of the regional climate.

DOI： 10.4005/jjfs.89.144

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Other Link： https://jlc.jst.go.jp/DN/JALC/00295817550?from=CiNii

Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Elsevier {BV}  

DOI： 10.1016/j.dendro.2005.08.003

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J-GLOBAL

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J-GLOBAL

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Language：Japanese  

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J-GLOBAL

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Language：Japanese  

CiNii Article

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Language：Japanese  

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Language：Japanese  

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Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (bulletin of university, research institution)  

J-GLOBAL

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Language：Japanese  

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J-GLOBAL

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Language：Japanese   Publisher：GEOCHEMICAL SOCIETY OF JAPAN  

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DOI： 10.14862/geochemproc.64.0_15

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Language：English  

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Language：Japanese  

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Language：Japanese   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

Humidity variation for Baiu rainy season for around the Kyoho period (1716-1735) in central Japan was reconstructed using intra-ring measurements of tree-ring oxygen isotope ratio.&nbsp;Cellulose oxygen isotope ratios&nbsp;for two hinoki cypress trees collected from Mt. Tanakami, central Japan,&nbsp;were measured at a resolution of 1/12 (partly, 1/24, 1/6 and 1/2, depending on ring width) of annual growth ring for the period of&nbsp;1704-1757 and 1968-1994. As results, interannual variation of oxygen isotope ratio for the early half of growth ring was found highly synchronous with averaged relative humidity for May 1 through July 20, early summer and Baiu rainy season in Japan. Also, it was found that amplitude of interannual variation of oxygen isotope ratio for early half of growth ring is substantially large for around 1720-1730 and dry Baiu rainy season occurred once in several years in this period.

DOI： 10.11520/jshwr.29.0_1

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Language：English  

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Publisher：The Association of Japanese Geographers  

DOI： 10.14866/ajg.2014a.0_188

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Language：Japanese   Publisher：GEOCHEMICAL SOCIETY OF JAPAN  

DOI： 10.14862/geochemproc.61.0_282

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Language：Japanese   Publisher：GEOCHEMICAL SOCIETY OF JAPAN  

DOI： 10.14862/geochemproc.61.0_286

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Language：Japanese   Publisher：GEOCHEMICAL SOCIETY OF JAPAN  

In order to reconstruct past change in hydroclimate at humid and warm Japan using tree-ring &delta;18O, we measured several tree ring samples growing from 1751 to 1998 at Kamegamori Mountain in Shikoku, southwestern Japan. The tree-ring &delta;18O chronology covering last two and a half centuries was derived from 6 living fir (Abies homolepis) trees and examined on its climate sensitivity by correlation analysis using instrumentally observed datasets on monthly average temperature, precipitation and relative humidity in Shikoku as well as for the nearest grid point of CRU TS3.21 dataset. The tree-ring cellulose &delta;18O was negatively correlated with the summer precipitation and relative humidity. The spatial correlations indicated the moisture source in the study region originates from the south, suggesting that the tree-ring oxygen isotope values are controlled by the moisture source and by transport processes. The tree-ring &delta;18O chronologies during the 248 years are consistent with extreme climate events recorded by some historical documents and meteorological records, such that the low &delta;18O years are corresponding to the years of long-term stagnant Baiu front conditions and/or large-scale typhoon occurrences. This tight relationship indicates that tree-ring &delta;18O in southwest Japan can be used as proxy of extreme climate events.

DOI： 10.14862/geochemproc.61.0_190

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