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A 50 cm long sediment core retrieved from Long Lake, a periglacial lake of Schirmacher Oasis in Dronning Maud Land was measured for elemental (C%, N% and C/N), isotopic (δ13C, δ15N) and particle size (sand-silt-clay percent) variation. The radiocarbon dated core spanning the last 48 cal ka BP has been deciphered for the lake\u0027s response to Antarctic climate. The C/N ratio (atomic ratio) predominantly indicates that the productivity has been autochthonous for majority of the down-core while the top 0–3 cm indicates that there has been addition of terrestrial organic matter into the lake system owing to longer ice-free conditions. The organic carbon shows significantly lower values (0.2%) throughout the glacial period and major part of the Holocene while the core-top values are consistent with the presence of a microbial mat which is reflected as higher organic carbon (12%). The δ13C and δ15N range from −33 to −9‰ and 2–18‰, respectively. The isotopic signals vary marginally for the entire glacial period (48–8 cal ka BP) suggesting an intense cold period. The gradual increase in C/N ratio, sand content and δ13C and decrease in δ15N beginning at about 6 cal ka BP suggest that the Long Lake experienced longer ice-free conditions owing to sustained warmer Holocene conditions suggesting that the ice-cover over the Long Lake persisted well through early-Holocene. The sand and silt percent shows inverse correlation likely reflecting the warmer and colder conditions. The Holocene is characterised by higher sand content owing to melting of ice due to warmer conditions. The Long Lake\u0027s response to Antarctic climate is reflected in its response to the ice-cover conditions which regulates the productivity and sedimentation in the lake system.", "subitem_description_type": "Abstract"}]}, "item_10001_description_6": {"attribute_name": "内容記述", "attribute_value_mlt": [{"subitem_description": "南極の露岩地帯における非汚染湖沼堆積物は、湖への過去の気候の影響や南極気候への応答を再現するプロキシーの重要な情報源である。Dronning Maud LandのSchirmacher Oasisの周氷河湖であるLong Lakeから採取された長さ50 cmの堆積物中の元素(C%, N%, C/N)、安定同位体比(δ13C, δ15N)および粒度変動(砂-シルト-粘土%)の測定がなされた。放射性炭素年代範囲が過去48 ka BPに及ぶ南極気候へのこの湖の応答を明らかにした。C/N原子比はコアの大部分における一次生産は自生性が支配的であることを示したが、最後の1.0 cal ka BPは長いアイスフリー状態により陸性有機物が加わっていることを示した。氷期における有機炭素(0.2%以下)は著しく低かったが、完新世の最後の1 cal ka BPでは高く最大12%を示した。δ13Cおよびδ15Nは、それぞれ−33から−9‰および2から18‰の範囲であった。同位体比は氷期全体(48 cal ka BPから8 cal ka BP)で強い寒冷期を示唆している。約6 cal ka BPに始まるC/N比,砂含量およびδ13C値の増加ならびδ15Nの減少は、Long Lakeが温暖な完新世ではアイスフリー状態が続いたが、初期完新世では氷で覆われていたことを示唆する。砂とシルトパーセントは逆相関で、主として温暖状態と寒冷状態を反映する。完新世は温暖状態により氷の融解による高い砂含量に特徴付けられる。Long Lakeの南極気候への応答は、湖システムにおける生産量および堆積状態をコントロールするアイスーカバー状態を反映する。", "subitem_description_type": "Other"}]}, "item_10001_relation_14": {"attribute_name": "DOI", "attribute_value_mlt": [{"subitem_relation_name": [{"subitem_relation_name_text": "10.1016/j.polar.2015.09.004"}], "subitem_relation_type_id": {"subitem_relation_type_id_text": "http://doi.org/10.1016/j.polar.2015.09.004", "subitem_relation_type_select": "DOI"}}]}, "item_10001_source_id_9": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "1873-9652", "subitem_source_identifier_type": "ISSN"}]}, "item_access_right": {"attribute_name": "アクセス権", "attribute_value_mlt": [{"subitem_access_right": "metadata only access", "subitem_access_right_uri": "http://purl.org/coar/access_right/c_14cb"}]}, "item_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "Badanal Siddaiah Mahesh, Anish Kumar Warrier, Rahul Mohan, Manish Tiwari, Anila Babu, Aswathi Chandran, Rajesh Asthana, Rasik Ravindra", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "25333", "nameIdentifierScheme": "WEKO"}]}]}, "item_keyword": {"attribute_name": "キーワード", "attribute_value_mlt": [{"subitem_subject": "Past-climate", "subitem_subject_language": "en", "subitem_subject_scheme": "Other"}, {"subitem_subject": "Schirmacher Oasis", "subitem_subject_language": "en", "subitem_subject_scheme": "Other"}, {"subitem_subject": "δ13C \u0026 δ15N", "subitem_subject_language": "en", "subitem_subject_scheme": "Other"}, {"subitem_subject": "Particle size distribution", "subitem_subject_language": "en", "subitem_subject_scheme": "Other"}, {"subitem_subject": "Long Lake", "subitem_subject_language": "en", "subitem_subject_scheme": "Other"}, {"subitem_subject": "Organic carbon", "subitem_subject_language": "en", "subitem_subject_scheme": "Other"}]}, "item_language": {"attribute_name": "言語", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_resource_type": {"attribute_name": "資源タイプ", "attribute_value_mlt": [{"resourcetype": "journal article", "resourceuri": "http://purl.org/coar/resource_type/c_6501"}]}, "item_title": "Response of Long Lake sediments to Antarctic climate: A perspective gained from sedimentary organic geochemistry and particle size analysis", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "Response of Long Lake sediments to Antarctic climate: A perspective gained from sedimentary organic geochemistry and particle size analysis"}, {"subitem_title": "Response of Long Lake sediments to Antarctic climate: A perspective gained from sedimentary organic geochemistry and particle size analysis", "subitem_title_language": "en"}]}, "item_type_id": "10001", "owner": "27", "path": ["1480"], "permalink_uri": "https://nipr.repo.nii.ac.jp/records/11005", "pubdate": {"attribute_name": "公開日", "attribute_value": "2016-01-14"}, "publish_date": "2016-01-14", "publish_status": "0", "recid": "11005", "relation": {}, "relation_version_is_last": true, "title": ["Response of Long Lake sediments to Antarctic climate: A perspective gained from sedimentary organic geochemistry and particle size analysis"], "weko_shared_id": 27}
Response of Long Lake sediments to Antarctic climate: A perspective gained from sedimentary organic geochemistry and particle size analysis
https://nipr.repo.nii.ac.jp/records/11005
https://nipr.repo.nii.ac.jp/records/1100574f18aa6-813d-44ec-99c5-75e59f01c843
Item type | 学術雑誌論文 / Journal Article(1) | |||||||
---|---|---|---|---|---|---|---|---|
公開日 | 2016-01-14 | |||||||
タイトル | ||||||||
タイトル | Response of Long Lake sediments to Antarctic climate: A perspective gained from sedimentary organic geochemistry and particle size analysis | |||||||
タイトル | ||||||||
言語 | en | |||||||
タイトル | Response of Long Lake sediments to Antarctic climate: A perspective gained from sedimentary organic geochemistry and particle size analysis | |||||||
言語 | ||||||||
言語 | eng | |||||||
キーワード | ||||||||
言語 | en | |||||||
主題Scheme | Other | |||||||
主題 | Past-climate | |||||||
キーワード | ||||||||
言語 | en | |||||||
主題Scheme | Other | |||||||
主題 | Schirmacher Oasis | |||||||
キーワード | ||||||||
言語 | en | |||||||
主題Scheme | Other | |||||||
主題 | δ13C & δ15N | |||||||
キーワード | ||||||||
言語 | en | |||||||
主題Scheme | Other | |||||||
主題 | Particle size distribution | |||||||
キーワード | ||||||||
言語 | en | |||||||
主題Scheme | Other | |||||||
主題 | Long Lake | |||||||
キーワード | ||||||||
言語 | en | |||||||
主題Scheme | Other | |||||||
主題 | Organic carbon | |||||||
資源タイプ | ||||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||
資源タイプ | journal article | |||||||
アクセス権 | ||||||||
アクセス権 | metadata only access | |||||||
アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||||
著者 |
Badanal Siddaiah Mahesh, Anish Kumar Warrier, Rahul Mohan, Manish Tiwari, Anila Babu, Aswathi Chandran, Rajesh Asthana, Rasik Ravindra
× Badanal Siddaiah Mahesh, Anish Kumar Warrier, Rahul Mohan, Manish Tiwari, Anila Babu, Aswathi Chandran, Rajesh Asthana, Rasik Ravindra
WEKO
25333
|
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抄録 | ||||||||
内容記述タイプ | Abstract | |||||||
内容記述 | Sediments from the pristine lakes of ice-free regions of Antarctica are a great source for proxies to reconstruct the effect of past-climate on the lake evolution and its response to Antarctic climate. A 50 cm long sediment core retrieved from Long Lake, a periglacial lake of Schirmacher Oasis in Dronning Maud Land was measured for elemental (C%, N% and C/N), isotopic (δ13C, δ15N) and particle size (sand-silt-clay percent) variation. The radiocarbon dated core spanning the last 48 cal ka BP has been deciphered for the lake's response to Antarctic climate. The C/N ratio (atomic ratio) predominantly indicates that the productivity has been autochthonous for majority of the down-core while the top 0–3 cm indicates that there has been addition of terrestrial organic matter into the lake system owing to longer ice-free conditions. The organic carbon shows significantly lower values (0.2%) throughout the glacial period and major part of the Holocene while the core-top values are consistent with the presence of a microbial mat which is reflected as higher organic carbon (12%). The δ13C and δ15N range from −33 to −9‰ and 2–18‰, respectively. The isotopic signals vary marginally for the entire glacial period (48–8 cal ka BP) suggesting an intense cold period. The gradual increase in C/N ratio, sand content and δ13C and decrease in δ15N beginning at about 6 cal ka BP suggest that the Long Lake experienced longer ice-free conditions owing to sustained warmer Holocene conditions suggesting that the ice-cover over the Long Lake persisted well through early-Holocene. The sand and silt percent shows inverse correlation likely reflecting the warmer and colder conditions. The Holocene is characterised by higher sand content owing to melting of ice due to warmer conditions. The Long Lake's response to Antarctic climate is reflected in its response to the ice-cover conditions which regulates the productivity and sedimentation in the lake system. | |||||||
内容記述 | ||||||||
内容記述タイプ | Other | |||||||
内容記述 | 南極の露岩地帯における非汚染湖沼堆積物は、湖への過去の気候の影響や南極気候への応答を再現するプロキシーの重要な情報源である。Dronning Maud LandのSchirmacher Oasisの周氷河湖であるLong Lakeから採取された長さ50 cmの堆積物中の元素(C%, N%, C/N)、安定同位体比(δ13C, δ15N)および粒度変動(砂-シルト-粘土%)の測定がなされた。放射性炭素年代範囲が過去48 ka BPに及ぶ南極気候へのこの湖の応答を明らかにした。C/N原子比はコアの大部分における一次生産は自生性が支配的であることを示したが、最後の1.0 cal ka BPは長いアイスフリー状態により陸性有機物が加わっていることを示した。氷期における有機炭素(0.2%以下)は著しく低かったが、完新世の最後の1 cal ka BPでは高く最大12%を示した。δ13Cおよびδ15Nは、それぞれ−33から−9‰および2から18‰の範囲であった。同位体比は氷期全体(48 cal ka BPから8 cal ka BP)で強い寒冷期を示唆している。約6 cal ka BPに始まるC/N比,砂含量およびδ13C値の増加ならびδ15Nの減少は、Long Lakeが温暖な完新世ではアイスフリー状態が続いたが、初期完新世では氷で覆われていたことを示唆する。砂とシルトパーセントは逆相関で、主として温暖状態と寒冷状態を反映する。完新世は温暖状態により氷の融解による高い砂含量に特徴付けられる。Long Lakeの南極気候への応答は、湖システムにおける生産量および堆積状態をコントロールするアイスーカバー状態を反映する。 | |||||||
書誌情報 |
Polar Science en : Polar Science 巻 9, 号 4, p. 359-367, 発行日 2015-12 |
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ISSN | ||||||||
収録物識別子タイプ | ISSN | |||||||
収録物識別子 | 1873-9652 | |||||||
DOI | ||||||||
識別子タイプ | DOI | |||||||
関連識別子 | http://doi.org/10.1016/j.polar.2015.09.004 | |||||||
関連名称 | 10.1016/j.polar.2015.09.004 |