Takahiro Watanabe
Biographic Data
| ID | 5597432 |
|---|---|
| NAME | Takahiro Watanabe |
| GIVEN NAMES | Takahiro |
| FAMILY NAME | Watanabe |
| SIGNATURE | WATANABE T |
| AFFILIATIONS | Japan Atomic Energy Agency |
| ORCID | 0000-0002-5742-5232 |
| VERIFIED | Yes |
| TOTAL WORKS | 9 |
| TOTAL CITATIONS | 2 |
| WORKS AS AUTHOR | 9 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 2005 |
| LATEST PUBLICATION YEAR | 2024 |
| H-INDEX | 1 |
Alternative Radiocarbon Age-Depth Model From Lake Baikal Sediment
We present an alternative radiocarbon ( 14 C) age-depth model using IntCal20 to calibrate new accelerator mass spectrometry (AMS) data applied to a Lake Baikal sediment core (VER99G12) in southern Siberia. 14 C dating showed that the core extends to 31 ka. To take into account uncertainties in 14 C age and sedimentation depth in the core, a new age-depth modeling routine, undatable , was used in this study. Undatable revealed that significant cha…
LA-ICPMS U–Pb Dating of Zircon in Paleotsunami Deposits from Miyazaki Plain, Southwest Japan
1662年寛文日向灘地震による宮崎平野の津波堆積物の特徴を把握するため,日本原子力研究開発機構 東濃地科学センターのレーザーアブレーション付き誘導結合プラズマ質量分析装置(LA-ICPMS)を用いて津波堆積物中の砕屑性ジルコンのU–Pb年代測定を実施した。本研究では,試料の化学的前処理手法としてchemical abrasion法を適用させ,U–Pb年代測定に必要な粒子径約50 μm以上のジルコン粒子25点を回収した。LA-ICPMS測定の結果,津波堆積物中の砕屑性ジルコンのU–Pb年代の範囲は約14 Maから約2405 Maであり,特に100 Maと2000 Ma付近の年代値を示すジルコン粒子が多く見られた。今後,測定実績をさらに蓄積していくことが重要であるが,本研究で得られた100 Ma付近の年代値を示す津波堆積物中のジルコン粒子は白亜紀から古第三紀に相当する四万十層群に由来する可能性が考えられる。また,1662年寛文日向灘地震による津波堆積物中の砕屑性ジルコンのU–Pb年代の分布は…
Simple and Rapid Method for Geochemically Discriminating of Paleotsunami Deposits Using a Portable X-ray Fluorescence Spectrometry System
To improve a method for geochemically discriminating paleotsunami deposits, a quantitative analysis of major and trace elements in boring cores from the Shizuoka plain on the Pacific coast of central Japan was performed using a portable energy dispersive X-ray fluorescence spectrometry system (portable XRF). Geochemical approaches using a portable XRF contribute to studies on simple and rapid methods for detecting paleotsunami deposits. Calibrati…
Radiocarbon and Stable Carbon Isotope Ratio Data from a 4.7-Mlong Sediment Core of Lake Baikal (Southern Siberia, Russia)
A sediment core (VER99G12; core length, 4.66 m) was taken from the Buguldeika Saddle of Lake Baikal in 1999. Radiocarbon measurements of total organic carbon (TOC) and pollen concentrate fractions from the VER99G12 core were performed by a Tandetron accelerator mass spectrometry (AMS) system (Model-4130, HVEE) at Nagoya University. The AMS 14 C ages showed that the VER99G12 core spans the past ∼30 cal ka BP (from the MIS 3 to present), and the av…
A New 14 C Data Set of the PY608W-PC Sediment Core from Lake Pumoyum Co (Southeastern Tibetan Plateau) Over the Last 19 kyr
A new continuous sediment core (PY608W-PC; 3.8 m length) for reconstruction of climatic and environmental changes in the southeastern Tibetan Plateau was taken from the eastern part of Lake Pumoyum Co in August 2006. Sediment layers of the lower part of PY608W-PC (380–300 cm depth) were composed mainly of relatively large plant residues (up to ∼3 cm in length) with an admixture of fine sand and sandy silt. The large plant residues disappeared at …
C Dating of Holocene Soils from an Island in Lake Pumoyum Co (Southeastern Tibetan Plateau)
Soil samples from an 85-cm-long continuous section (PY608ES) were collected from an island in Lake Pumoyum Co (southeastern Tibetan Plateau, ∼5020 m asl) in August 2006. To estimate past environmental conditions of Lake Pumoyum Co during the Holocene, we analyzed radiocarbon ages, stable carbon isotope compositions, and total organic carbon/total nitrogen (TOC/TN) atomic ratios of the soil samples. The 14 C measurements were performed with the Ta…
High-time resolution AMS 14C data sets for Lake Baikal and Lake Hovsgol sediment cores
Seasonal Variation in Sources of Dissolved Organic Carbon in a Lacustrine Environment Revealed by Paired Isotopic Measurements (Δ 14 C and δ 13 C)
To investigate the sources and cycling of dissolved organic carbon (DOC) in a lacustrine environment, isotopic measurements of 14 C and 13 C in DOC were carried out for Lake Kasumigaura—which is famous as a very eutrophic and shallow (mean depth 4.0 m) lake in central Japan—and its tributary rivers. Lake and river samples were collected in the spring and autumn (May and September) of 2003. The Δ 14 C measurements of DOC were performed using the a…
Response of phytoplankton productivity to climate change recorded by sedimentary photosynthetic pigments in Lake Hovsgol (Mongolia) for the last 23,000 years
Alternative Radiocarbon Age-Depth Model From Lake Baikal Sediment
We present an alternative radiocarbon ( 14 C) age-depth model using IntCal20 to calibrate new accelerator mass spectrometry (AMS) data applied to a Lake Baikal sediment core (VER99G12) in southern Siberia. 14 C dating showed that the core extends to 31 ka. To take into account uncertainties in 14 C age and sedimentation depth in the core, a new age-depth modeling routine, undatable , was used in this study. Undatable revealed that significant cha…
C Dating of Holocene Soils from an Island in Lake Pumoyum Co (Southeastern Tibetan Plateau)
Soil samples from an 85-cm-long continuous section (PY608ES) were collected from an island in Lake Pumoyum Co (southeastern Tibetan Plateau, ∼5020 m asl) in August 2006. To estimate past environmental conditions of Lake Pumoyum Co during the Holocene, we analyzed radiocarbon ages, stable carbon isotope compositions, and total organic carbon/total nitrogen (TOC/TN) atomic ratios of the soil samples. The 14 C measurements were performed with the Ta…
Response of phytoplankton productivity to climate change recorded by sedimentary photosynthetic pigments in Lake Hovsgol (Mongolia) for the last 23,000 years
Seasonal Variation in Sources of Dissolved Organic Carbon in a Lacustrine Environment Revealed by Paired Isotopic Measurements (Δ 14 C and δ 13 C)
To investigate the sources and cycling of dissolved organic carbon (DOC) in a lacustrine environment, isotopic measurements of 14 C and 13 C in DOC were carried out for Lake Kasumigaura—which is famous as a very eutrophic and shallow (mean depth 4.0 m) lake in central Japan—and its tributary rivers. Lake and river samples were collected in the spring and autumn (May and September) of 2003. The Δ 14 C measurements of DOC were performed using the a…
High-time resolution AMS 14C data sets for Lake Baikal and Lake Hovsgol sediment cores
Radiocarbon and Stable Carbon Isotope Ratio Data from a 4.7-Mlong Sediment Core of Lake Baikal (Southern Siberia, Russia)
A sediment core (VER99G12; core length, 4.66 m) was taken from the Buguldeika Saddle of Lake Baikal in 1999. Radiocarbon measurements of total organic carbon (TOC) and pollen concentrate fractions from the VER99G12 core were performed by a Tandetron accelerator mass spectrometry (AMS) system (Model-4130, HVEE) at Nagoya University. The AMS 14 C ages showed that the VER99G12 core spans the past ∼30 cal ka BP (from the MIS 3 to present), and the av…
A New 14 C Data Set of the PY608W-PC Sediment Core from Lake Pumoyum Co (Southeastern Tibetan Plateau) Over the Last 19 kyr
A new continuous sediment core (PY608W-PC; 3.8 m length) for reconstruction of climatic and environmental changes in the southeastern Tibetan Plateau was taken from the eastern part of Lake Pumoyum Co in August 2006. Sediment layers of the lower part of PY608W-PC (380–300 cm depth) were composed mainly of relatively large plant residues (up to ∼3 cm in length) with an admixture of fine sand and sandy silt. The large plant residues disappeared at …
C Dating of Holocene Soils from an Island in Lake Pumoyum Co (Southeastern Tibetan Plateau)
Soil samples from an 85-cm-long continuous section (PY608ES) were collected from an island in Lake Pumoyum Co (southeastern Tibetan Plateau, ∼5020 m asl) in August 2006. To estimate past environmental conditions of Lake Pumoyum Co during the Holocene, we analyzed radiocarbon ages, stable carbon isotope compositions, and total organic carbon/total nitrogen (TOC/TN) atomic ratios of the soil samples. The 14 C measurements were performed with the Ta…
LA-ICPMS U–Pb Dating of Zircon in Paleotsunami Deposits from Miyazaki Plain, Southwest Japan
1662年寛文日向灘地震による宮崎平野の津波堆積物の特徴を把握するため,日本原子力研究開発機構 東濃地科学センターのレーザーアブレーション付き誘導結合プラズマ質量分析装置(LA-ICPMS)を用いて津波堆積物中の砕屑性ジルコンのU–Pb年代測定を実施した。本研究では,試料の化学的前処理手法としてchemical abrasion法を適用させ,U–Pb年代測定に必要な粒子径約50 μm以上のジルコン粒子25点を回収した。LA-ICPMS測定の結果,津波堆積物中の砕屑性ジルコンのU–Pb年代の範囲は約14 Maから約2405 Maであり,特に100 Maと2000 Ma付近の年代値を示すジルコン粒子が多く見られた。今後,測定実績をさらに蓄積していくことが重要であるが,本研究で得られた100 Ma付近の年代値を示す津波堆積物中のジルコン粒子は白亜紀から古第三紀に相当する四万十層群に由来する可能性が考えられる。また,1662年寛文日向灘地震による津波堆積物中の砕屑性ジルコンのU–Pb年代の分布は…
Simple and Rapid Method for Geochemically Discriminating of Paleotsunami Deposits Using a Portable X-ray Fluorescence Spectrometry System
To improve a method for geochemically discriminating paleotsunami deposits, a quantitative analysis of major and trace elements in boring cores from the Shizuoka plain on the Pacific coast of central Japan was performed using a portable energy dispersive X-ray fluorescence spectrometry system (portable XRF). Geochemical approaches using a portable XRF contribute to studies on simple and rapid methods for detecting paleotsunami deposits. Calibrati…
Alternative Radiocarbon Age-Depth Model From Lake Baikal Sediment
We present an alternative radiocarbon ( 14 C) age-depth model using IntCal20 to calibrate new accelerator mass spectrometry (AMS) data applied to a Lake Baikal sediment core (VER99G12) in southern Siberia. 14 C dating showed that the core extends to 31 ka. To take into account uncertainties in 14 C age and sedimentation depth in the core, a new age-depth modeling routine, undatable , was used in this study. Undatable revealed that significant cha…
Geology (9 works) · Geology and Paleoclimatology Research (7 works) · Oceanography (6 works) · Paleontology (6 works) · Radiocarbon dating (6 works) · Chemistry (5 works) · Environmental Chemistry (5 works) · Physical geography (5 works) · Sediment (5 works) · Geography (4 works)