@article{oai:nagoya.repo.nii.ac.jp:00012816, author = {渡邊, 隆広 and 中村, 俊夫 and 西村, 弥亜 and 松中, 哲也 and 井筒, 康裕 and 南, 基泰 and 奈良, 郁子 and 掛川, 武 and Zhu, Liping and WATANABE, Takahiro and NAKAMURA, Toshio and NISHIMURA, Mitsugu and MATSUNAKA, Tetsuya and IZUTSU, Yasuhiro and MINAMI, Motoyasu and NARA, Watanabe Fumiko and KAKEGAWA, Takeshi}, journal = {名古屋大学加速器質量分析計業績報告書}, month = {Mar}, note = {Pumoyum Co is fresh water lake formed by fault action, and located in the southeastern Tibetan plateau (28°34'N, 90°24'E, altitude: ~5030 m asl, lake surface area: 281 km2, maximum water depth: ~65 m). Lake Pumoyum Co has at least 40 m sedimentary sequence, which is believed to cover the latest Quatemary. A first continuous sediment core (PY104PC, core length; 4 m) was taken from the eastern part of Pumoyum Co in the April 2001 for the reconstruction of climatic changes on the area. For Lake Pumoyum Co, preliminary results for ^<14>C ages of plant residues in a sediment core have been reported by Watanabe et al (2008). In the previous ^<14>C chronology, estimation of changes in the sources of plant residues and reservoir effects were insufficient. Therefore, major c1imate boundary layers, such as Bølling- Allerød warm phase, have not been determined. In 2006, a new continuous sediment core (PY608W-PC, core length: 3.9m) was obtained using a piston corer from Lake Pumoyum Co (28°33'14"N; 90°28'17''E, at a water depth of 50 m). In this study, fine plant residues in the PY608W-PC core were concentrated by wet-sieving (opening, 125μm) and were picked up in order to eliminate the effect of old carbon. ^<14>C dating of the plant residues from the PY608WPC shows that the sediment core contains a continuous record, over the past 19 cal ka BP. The layer with transition into Bølling-Allerød (BA) warm phase from the last glacial period (~15 cal ka BP) was consistent with the obvious lithologic boundary (sudden disappearance for the macrophyte remains in sediment layer), 第21回名古屋大学年代測定総合研究センターシンポジウム平成20(2008)年度報告}, pages = {88--92}, title = {シベリア・チベット地域の湖沼から採取した湖底柱状堆積物の放射性炭素年代測定 - 3 : PY608W コア試料(チベット・プマユムツォ湖)}, volume = {20}, year = {2009} }