{"_buckets": {"deposit": "62ee57f2-7c4d-4a66-837f-5b0da08f3d65"}, "_deposit": {"id": "11836", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "11836"}, "status": "published"}, "_oai": {"id": "oai:nagoya.repo.nii.ac.jp:00011836"}, "item_9_alternative_title_19": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u8a00\u8a9e\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "Investigation on the age reversal found in a sediment core from Lake Pumayum Co in the southeastern part of the Tibetan Plateau(Proceedings of the 19^\u003cth\u003e Symposium on Chronological Studies at the Nagoya University Center for Chronological Research in 2006,Part 2)"}]}, "item_9_biblio_info_6": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2007-03", "bibliographicIssueDateType": "Issued"}, "bibliographicPageEnd": "171", "bibliographicPageStart": "162", "bibliographicVolumeNumber": "18", "bibliographic_titles": [{"bibliographic_title": "\u540d\u53e4\u5c4b\u5927\u5b66\u52a0\u901f\u5668\u8cea\u91cf\u5206\u6790\u8a08\u696d\u7e3e\u5831\u544a\u66f8"}]}]}, "item_9_description_4": {"attribute_name": "\u6284\u9332", "attribute_value_mlt": [{"subitem_description": "Little has been known in details as to how the Tibetan Plateau had responded to global climatic oscillations in the paleoenvironmental history. In order to elucidate when and how the deglaciation and the subsequent warm and wet climate after the last glacial maximum (LGM) started on the plateau, and then were linked to the restoration of the southwest monsoon, we have been trying to organic-geochemically analyze the paleoenvironments recorded in a 4m-long sediment core (PY409PC) collected from Lake Pumayum Co in a southeast part of the plateau. However, it was found that the sediment ages strikingly reversed from 14,220yrB.P to 19,507yrB.P between the bottom and 40cm in depth toward the top, and the age reversal is hindering us from going on the paleoenvironmental analysis. It appeared that the reversal was caused by the contribution of \"old carbon\" from certain natural source to the lake, rather than a contamination during sampling and analyzing. We attempted to make clear the old carbon source and the factors controlling the contribution, and obtained the following results: 1) As the supply of organic matter to the lake decreased since ca.14,200yrB.P, the type of organic matter deposited probably changed from soil organic matter originated mainly from a kind of grasses grown on relatively wet lands to those from recent terrestrial plants on ordinary lands with age. This is seemed to have been caused by the environmental change that the wet lands surrounding the lake at that time were lost by a rapid expansion of the water basin, due to the activation of water circulation. 2) It is likely that organic matter with \"old carbon\" has continuously contributed to the lake sediments as a background at least since ca.14,200yrB.P. The results suggested that the age reversal found in our core sample was resulted from the increasing relative contribution of soil organic matter with \"old carbon\" to the sedimentary organic matter, coupled with the decrease in a supply of new organic matter from land with age.", "subitem_description_type": "Abstract"}]}, "item_9_description_5": {"attribute_name": "\u5185\u5bb9\u8a18\u8ff0", "attribute_value_mlt": [{"subitem_description": "\u7b2c19\u56de\u540d\u53e4\u5c4b\u5927\u5b66\u5e74\u4ee3\u6e2c\u5b9a\u7dcf\u5408\u7814\u7a76\u30bb\u30f3\u30bf\u30fc\u30b7\u30f3\u30dd\u30b8\u30a6\u30e0\u5e73\u621018(2006)\u5e74\u5ea6\u5831\u544a\u003c\u7b2c2\u90e8\u003e Proceedings of the 19th symposiumon on Chronological Studies at the Nagoya University Center for Chronological Research\\\nin 2006 \u65e5\u6642:\u5e73\u621019 (2007)\u5e741\u670815\u65e5(\u6708)\uff5e17\u65e5(\u6c34) \u4f1a\u5834:\u540d\u53e4\u5c4b\u5927\u5b66\u30b7\u30f3\u30dd\u30b8\u30aa\u30f3 Date:January15th-17th, 2007 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