{"created":"2021-03-01T06:25:33.446081+00:00","id":18166,"links":{},"metadata":{"_buckets":{"deposit":"91cb77e4-f027-4288-807d-95925d9b17b8"},"_deposit":{"id":"18166","owners":[],"pid":{"revision_id":0,"type":"depid","value":"18166"},"status":"published"},"_oai":{"id":"oai:nagoya.repo.nii.ac.jp:00018166","sets":["879:1183:1184:1612"]},"author_link":["83799","83800"],"item_1615768549627":{"attribute_name":"出版タイプ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_9_alternative_title_19":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Contribution of carbonate area to carbon source at Lake Biwa","subitem_alternative_title_language":"en"}]},"item_9_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2013-03","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"208","bibliographicPageStart":"201","bibliographicVolumeNumber":"24","bibliographic_titles":[{"bibliographic_title":"名古屋大学加速器質量分析計業績報告書","bibliographic_titleLang":"ja"}]}]},"item_9_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Using newly collected data combined with data from previous studies, we compared the measured radiocarbon ages of archaeological samples, which was the  pair of charred seed and molluscan shells, and terrestrial and aquatic animal bones around Lake Biwa, and of pine needles, Phragmites, and molluscan shells, collected in 1966, 1970, 1990 and 2008 at Lake Biwa in Japan, to examine freshwater reservoir effects at Lake Biwa. We also tested for age differences in radiocarbon dating among shell species, tissues and collected locations in the lake, to evaluate the influence for radiocarbon dating of archaeological samples in Lake Biwa. The molluscan shells collected after 1990 were largely unaffected by the nuclear testing that occurred in the 1950s and 1960s, whereas the 1966 and 1970 samples appeared to be affected by it, which make the reservoir ages older than expected. The shells collected after 1990 had radiocarbon ages that were 330-450 14C years older than those of the coeval atmosphere. The apparent differences in radiocarbon age (about 300 14C years) for the pair of shell fossils and wood samples, and turtles and terrestrial mammals excavated from the same layer of the submerged Awazu shell midden at Lake Biwa suggest that the freshwater reservoir effect also existed in the middle Holocene (the Middle Jomon period, about 5000 years ago). Because the present-day average residence time of Lake Biwa water is less than a decade, its direct influence on the reservoir effect is small, which suggests that anyway old carbon has been supplied into Lake Biwa. To put it more concretely, there is the high possibility that the system as keeping the value of the freshwater reservoir effect in 300-450 14C years (steady state) function in Lake Biwa and then the closed Lake Biwa system has been in dynamic equilibrium state from 1950's up to the present, correspondingly enormous 14C input by atmospheric nuclear testing and its gradually decreasing.","subitem_description_language":"en","subitem_description_type":"Abstract"},{"subitem_description":"琵琶湖水中の溶存無機炭素(Dissolved Inorganic Carbon:DIC)の炭素14濃度DI14C濃度)を粟津湖底k貝殻遺跡出土セタシジミと炭化材のペアおよび現生セタシジミ殻などの炭素14濃度から推定し,同時代の大気に比べてどの位古い炭素年代を示しているのかを調べた(淡水リザーバー効果)。その結果,5000年前～現代まで,ほぼ一定の330～450年古い年代を示している可能性が示唆された。1914年～2000年までの統計データによると,近年の琵琶湖水の平均滞留時間(τ(年) =湖水量(V)/河川流入量(V/年))は3-6年と計算され,湖水の平均滞留時間のみでは330年～450年という湖水のリザーバー効果を説明することはできない。つまり,何らかの古い炭素が琵琶湖水に影響を与えていることが明らかになった。そこで,本研究では,このリザーバー年代を説明するために,琵琶湖のシンプルな水理構造を利用して,モデル計算を行った。その結果,例えば,平均滞留時間3-6年の湖水～65%に対して,1000BPの古い炭素が～35%寄与すれば湖水のDI14C濃度の経年変動を説明できることがわかった。さらに,伊吹山や霊前山などの(Dead carbonである)石灰岩地帯の湧水,河川水などのDI14C濃度の測定結果を合わせると,湖水に供給される炭素の～15%が石灰岩地帯起源のものであると推定された。今後,琵琶湖とその他の湖を比較検討することにより,湖水の炭素循環,湖内の食物連鎖,そして,湖沼水圏環境の炭素年代測定値の補正値に関してより包括的な理解が進むことが期待される。","subitem_description_language":"ja","subitem_description_type":"Abstract"}]},"item_9_description_5":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"タンデトロン加速器質量分析計業績報告","subitem_description_language":"ja","subitem_description_type":"Other"}]},"item_9_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.18999/sumrua.24.201","subitem_identifier_reg_type":"JaLC"}]},"item_9_publisher_32":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"名古屋大学年代測定資料研究センター","subitem_publisher_language":"ja"}]},"item_9_select_15":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_select_item":"publisher"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"宮田, 佳樹","creatorNameLang":"ja"}],"nameIdentifiers":[{"nameIdentifier":"83799","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Miyata, Yoshiki","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"83800","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2018-02-21"}],"displaytype":"detail","filename":"sumrua_24_201.pdf","filesize":[{"value":"4.8 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"sumrua_24_201.pdf","objectType":"fulltext","url":"https://nagoya.repo.nii.ac.jp/record/18166/files/sumrua_24_201.pdf"},"version_id":"d6ab6a65-e51f-4640-a178-95850353ae81"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"Freshwater reservoir effect","subitem_subject_scheme":"Other"},{"subitem_subject":"Lake Biwa","subitem_subject_scheme":"Other"},{"subitem_subject":"Carbonate","subitem_subject_scheme":"Other"},{"subitem_subject":"Average lake water residence time","subitem_subject_scheme":"Other"},{"subitem_subject":"淡水リザーバー効果","subitem_subject_scheme":"Other"},{"subitem_subject":"琵琶湖","subitem_subject_scheme":"Other"},{"subitem_subject":"炭酸塩","subitem_subject_scheme":"Other"},{"subitem_subject":"平均滞留時間","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"琵琶湖の炭素源への石灰岩地帯の寄与","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"琵琶湖の炭素源への石灰岩地帯の寄与","subitem_title_language":"ja"}]},"item_type_id":"9","owner":"1","path":["1612"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2014-06-10"},"publish_date":"2014-06-10","publish_status":"0","recid":"18166","relation_version_is_last":true,"title":["琵琶湖の炭素源への石灰岩地帯の寄与"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-01-16T04:06:40.933566+00:00"}