Toshio Nakamura

Biographic Data

ID3779377
NAMEToshio Nakamura
GIVEN NAMESToshio
FAMILY NAMENakamura
SIGNATURENAKAMURA T
AFFILIATIONSNagoya University
VERIFIEDNo
TOTAL WORKS68
TOTAL CITATIONS154
AUTHOR COUNT68
EDITOR COUNT0
FIRST PUBLICATION YEAR1992
LATEST PUBLICATION YEAR2024
H-INDEX7

  • A 1179-yr (417–1595 CE) tree-ring oxygen isotope chronology for northern Japan validated using the 774–775 CE radiocarbon spike

    Open AccessMasaki Sano, Zhen Li et al.ARTICLERadiocarbon2024References: 24

    We present an annual-resolution, millennium-long tree-ring chronology for northern Japan. The chronology is based on 5309 measurements of tree-ring δ 18 O 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 δ 18 O variations was robust among all 37 samples…

  • New data and synthesis of ΔR estimates from the northern Pacific Ocean

    Open AccessB F Khasanov, B Fitzhugh et al.ARTICLEQuaternary Research2022

    We present new data on regional correction factor (ΔR) conducted for Chukotka, the Commander Islands, and the western Aleutian Islands and summarize data previously published for the other parts of the region. Paired radiocarbon dates of coeval marine and terrestrial materials from the archaeological site Kaniskak were obtained in Chukotka, and one such pair was analyzed from Shemya Island (western Aleutians). Three samples of sea otter ( Enhydra…

  • Radiocarbon analysis of tree ring for a catastrophic collapse in the northern Yatsugatake volcanoes

    Open AccessNagayoshi Katsuta, Yosuke Okuda et al.ARTICLEQuaternary International2021

  • Evidence of Mass Mortality of the Long-Lived Bivalve Mercenaria Stimpsoni Caused by a Catastrophic Tsunami

    Open AccessKaoru Kubota, Kotaro Shirai et al.ARTICLERadiocarbon2021References: 41

    Tsunamis are huge disasters that can significantly damage benthic organisms and the sea-bottom environment in coastal areas. It is of great ecological importance to understand how benthic ecosystems respond to such destructive forces and how individual species are affected. Investigating the effect of such disasters on animals that are seldom caught alive is particularly difficult. Bivalve mollusks are especially suitable for investigating how a …

  • The 4.2 ka event and its resulting cultural interruption in the Daihai Lake basin at the East Asian summer monsoon margin

    Open AccessJule Xiao, Shengrui Zhang et al.ARTICLEQuaternary International2019

  • Radiocarbon dating of textile Components from Historical silk costumes and other cloth products in the Ryukyu Islands, Japan

    Open AccessToshio Nakamura, Takako Terada et al.ARTICLERadiocarbon2019Cited by: 1References: 11

    In our research on traditional clothing and accessories in the Ryukyu Islands of Japan, we have collected cloth fragments from traditional Ryukyuan costumes and other fabric products for radiocarbon ( 14 C) dating. In this study, the cloth samples from historical costumes of noro priestesses (two samples), men and women from high-status families (five samples), and non-costume cloth products (seven samples), belonging to the traditional hereditar…

  • More Rapid 14 C Excursions in the Tree-Ring Record

    Open AccessA J T Jull, Irina Panyushkina et al.ARTICLERadiocarbon2018Cited by: 16References: 57

    Two radiocarbon ( 14 C) excursions are caused by an increase of incoming cosmic rays on a short time scale found in the Late Holocene (AD 774–775 and AD 993–994), which are widely explained as due to extreme solar proton events (SPE). In addition, a larger event has also been reported at 5480 BC (Miyake et al. 2017a), which is attributed to a special mode of a grand solar minimum, as well as another at 660 BC (Park et al. 2017). Clearly, other ev…

  • Verification of the Annual Dating of the 10th Century Baitoushan Volcano Eruption Based on an AD 774–775 Radiocarbon Spike

    Open AccessMasataka Hakozaki, Fusa Miyake et al.ARTICLERadiocarbon2018Cited by: 8References: 17

    The so-called Millennium Eruption of Baitoushan Volcano is one of the largest of the Common Era but its date has been uncertain. Recently, Oppenheimer et al. (2017) reported the eruptive year as late AD 946 using a new method called carbon-14 spike matching. However, it is necessary to verify their result to confirm the eruptive year, since only one wood sample was used in their study. We verified the eruptive year by measuring 14 C contents in t…

  • Vegetation Changes around Haven Lake, Adak Island, Central Aleutians, Alaska, Determined from Pollen Analysis

    Open AccessMakoto Noguchi, Toshiyuki Fujiki et al.ARTICLERadiocarbon2018References: 13

    We collected peat sediments (sediment core ADK13083002) from Haven Lake on the north side of Adak Island (central Aleutian Islands, Alaska) to determine whether the vegetation has changed. We confirmed the presence of six tephra layers, including Forty Years (0.3 cal ka BP), T2, YBO (3.3 cal ka BP), Intermediate (6.4 cal ka BP), Main (9.5 cal ka BP), and T6. We identified four major pollen assemblage zones (HL-1 to HL-4, in descending order) in t…

  • A higher moisture level in the early Holocene in northern Mongolia as evidenced from sediment records of Lake Hovsgol and Lake Erhel

    Open AccessNagayoshi Katsuta, Genki I Matsumoto et al.ARTICLEQuaternary International2017

  • Variability of the 14 C reservoir effects in Lake Tangra Yumco, Central Tibet (China), determined from recent sedimentation rates and dating of plant fossils

    Open AccessJunbo Wang, Liping Zhu et al.ARTICLEQuaternary International2017

  • Tephra identification and radiocarbon chronology of sediment from Paitan Lake at the northern part of Luzon Central Plain, Philippines

    Open AccessToshimichi Nakanishi, Masayuki Torii et al.ARTICLEQuaternary International2017

  • Search for Annual 14 C Excursions in the Past

    Open AccessFusa Miyake, Kimiaki Masuda et al.ARTICLERadiocarbon2017Cited by: 4References: 26

    Two radiocarbon excursions (AD 774–775 and AD 993–994) occurred due to an increase of incoming cosmic rays on a short timescale. The most plausible cause of these events is considered to be extreme solar proton events (SPE). It is possible that there are other annual 14 C excursions in the past that have yet to be confirmed. In order to detect more of these events, we measured the 14 C contents in bristlecone pine tree-ring samples during the per…

  • AMS Radiocarbon Dates on Peat Section Related with Tephra and Archaeological Sites in Carlisle Island, the Islands of Four Mountains, Alaska

    Open AccessMitsuru Okuno, Pavel Izbekov et al.ARTICLERadiocarbon2017References: 5

    We obtained radiocarbon ( 14 C) dates with accelerator mass spectrometry (AMS) of vascular plant samples and a charcoal sample collected from peat deposits near the prehistoric village site informally designated CR-03 on Carlisle Island in the Islands of Four Mountains group, Alaska, to determine the eruption age of the CR-02 tephra. A fine vitric ash erupted from Okmok caldera, Umnak Island (ca. 2 ka BP) was also discovered in the bog. The ages …

  • Accurate Age Estimation Using 14 C Content in Japanese Human Teeth

    Open AccessKeisuke Kunita, Toshio Nakamura et al.ARTICLERadiocarbon2017Cited by: 1References: 23

    We investigated age estimation of persons using 45 Japanese human teeth that consisted of mainly the third molar. We measured the radiocarbon content in tooth enamel hydroxyapatite from the crown as well as those in collagen and bioapatite in the root of the same tooth. Age estimations from tooth enamel apatite yielded an absolute age shift of 1.7±1.4 yr from the true age. This value suggests that estimating the age of Japanese people from tooth …

  • Radiocarbon Chronology of the DSDDP Core at the Deepest Floor of the Dead Sea

    Open AccessHiroyuki Kitagawa, Mordechai Stein et al.ARTICLERadiocarbon2017References: 43

    This study establishes the chronological framework of the sedimentary sequence deposited Dead Sea, ICDP 5017-1, Radiocarbon chronology during the past 50 ka at the deepest part of the Dead Sea (the ICDP 5017-1 site), which was recovered by the Dead Sea Deep Drilling Project (DSDDP) under the auspices of the International Continental Scientific Drilling Program (ICDP). The age-depth model is constructed using 38 14 C dates of terrestrial plant rem…

  • Compatibility of Atmospheric 14 CO 2 Measurements

    Open AccessSamuel Hammer, Ronny Friedrich et al.ARTICLERadiocarbon2017Cited by: 3References: 22

    Combining atmospheric Δ 14 CO 2 data sets from different networks or laboratories requires secure knowledge on their compatibility. In the present study, we compare Δ 14 CO 2 results from the Heidelberg low-level counting (LLC) laboratory to 12 international accelerator mass spectrometry (AMS) laboratories using distributed aliquots of five pure CO 2 samples. The averaged result of the LLC laboratory has a measurement bias of –0.3±0.5‰ with respe…

  • AMS Radiocarbon Dates of Pyroclastic-Flow Deposits on the Southern Slope of the Kuju Volcanic Group, Kyushu, Japan

    Open AccessMitsuru Okuno, Shinji Nagaoka et al.ARTICLERadiocarbon2017Cited by: 1References: 7

    The Kuju volcanic group, located in central Kyushu, Japan, consists of small stratovolcanoes and lava domes. To refine the eruptive history of the group, we conducted accelerator mass spectrometry (AMS) radiocarbon dating of charcoal fragments from three pyroclastic-flow (PF) deposits on the southern slope. The obtained 14 C dates are consistent with the geomorphology, stratigraphy, and thermoluminescence (TL) ages. The Handa PF deposits, which a…

  • High-precision age determination of Holocene samples by radiocarbon dating with accelerator mass spectrometry at Nagoya University

    Open AccessToshio Nakamura, Kimiaki Masuda et al.ARTICLEQuaternary International2016

  • Changes of Chemical Structure and Composition of Charcoal by Radiocarbon Pretreatments

    Open AccessShinji Tomiyama, Masayo Minami et al.ARTICLERadiocarbon2016Cited by: 3References: 29

    Charcoal is widely used for radiocarbon dating in archaeological and paleoenvironmental studies. Reliable 14 C dating requires appropriate chemical treatment to remove postdeposition contamination from the charcoal samples. This study assesses two pretreatments: acid-base-acid (ABA) and acid-base-oxidation with stepped combustion (ABOx-SC). In addition to 14 C, the effects of the treatments on the chemical structure and composition of charcoal we…

  • The Marine Radiocarbon Reservoir Effect on Adak Island (Central Aleutian Islands), Alaska

    Open AccessBulat F Khasanov, Toshio Nakamura et al.ARTICLERadiocarbon2015Cited by: 1References: 18

    Radiocarbon dates ( n = 18) from three archaeological sites on Adak Island, Alaska, were analyzed to understand the marine reservoir offset. Samples of marine and terrestrial origins recovered from the same archaeological context were compiled in nine pairs. The mean ΔR value calculated for them totaled 545 ± 10 yr. This value can be regarded as a sound estimate of the marine reservoir offset in the central Aleutians

  • Vegetation Changes Viewed from Pollen Analysis in Rarotonga, Southern Cook Islands, Eastern Polynesia

    Toshiyuki Fujiki, Mitsuru Okuno et al.ARTICLERadiocarbon2014

    This study presents accelerator mass spectrometry (AMS) radiocarbon dates and pollen assemblages of 400-cm core sediments collected from the Karekare Swamp in Rarotonga, Southern Cook Islands, to investigate vegetation changes on the island, in particular those induced by human impacts. Eight 14 C dates of charcoal and higher plant fragment samples indicate that the sediments accumulated since ∼6.0 cal kBP, with an apparent interruption of deposi…

  • Verification of the Cosmic-Ray Event in AD 993–994 by Using a Japanese Hinoki Tree

    Open AccessFusa Miyake, Kimiaki Masuda et al.ARTICLERadiocarbon2014Cited by: 12References: 9

    A rapid yearly increase in the radiocarbon content has been detected for the period from AD 993 to 994. However, this event is supported by the 14 C measurements of only one cedar tree sample, and verification is necessary to confirm this event more reliably. For this purpose, this study measured the 14 C content in Japanese Hinoki tree rings corresponding to the period from AD 988 to 997 using the accelerator mass spectrometry system at Yamagata…

  • Radiocarbon Ages of Annual Rings from Japanese Wood

    Open AccessToshio Nakamura, Kimiaki Masuda et al.ARTICLERadiocarbon2013Cited by: 10References: 15

    To investigate the radiocarbon concentration of atmospheric CO 2 over the past few millennia in Japan, we measured the 14 C age of annual rings from 3 Japanese trees with calendar dates ranging from ∼2000 yr old to present, and we compared the tree-ring 14 C age with the corresponding 14 C age from IntCal09. In some instances, the 14 C ages of the annual rings of Japanese trees are not consistent with the IntCal09 data sets. Often, the 14 C ages …

  • AMS Radiocarbon Dating and Pollen Analysis of Core Ks0412-3 from Kashibaru Marsh in Northern Kyushu, Southwest Japan

    Open AccessToshiyuki Fujiki, Mitsuru Okuno et al.ARTICLERadiocarbon2013References: 8

    We performed pollen analysis and accelerator mass spectrometry (AMS) radiocarbon dating on cored sediments (KS0412-3) from Kashibaru Marsh, located in the western part of the Sefuri Mountains in northern Kyushu, southwestern Japan, to investigate environmental change around the marsh. Sediment accumulation began in this marsh around cal AD 1200 and continued with an estimated average sedimentation rate of about 4 mm/yr. Human rice cultivation at …