{"created":"2023-07-25T11:07:18.644838+00:00","id":11043,"links":{},"metadata":{"_buckets":{"deposit":"7f5c9e12-cd3f-46c5-8db1-4d84fcbda7ef"},"_deposit":{"created_by":27,"id":"11043","owners":[27],"pid":{"revision_id":0,"type":"depid","value":"11043"},"status":"published"},"_oai":{"id":"oai:nipr.repo.nii.ac.jp:00011043","sets":[]},"author_link":["25782"],"item_10001_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2016-03","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"1","bibliographicPageEnd":"35","bibliographicPageStart":" 24","bibliographicVolumeNumber":"10","bibliographic_titles":[{"bibliographic_title":"Polar Science"},{"bibliographic_title":"Polar Science","bibliographic_titleLang":"en"}]}]},"item_10001_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"To understand the sources and sinks of sulphate and associated biogeochemical processes in a High Arctic environment, late winter snowpacks, the summer melt-waters and rock samples were collected and analysed for major ions and stable isotope tracers (δ18O, δ34S). The SO42¯/Cl¯ ratio reveal that more than 87% of sulphate (frequently > 95%) of total sulphate carried by the subglacial runoff and proglacial streams was derived from non-snowpack sources. The proximity of non-snowpack sulphate δ34S (∼8–19‰) to the δ34S of the major rocks in the vicinity (∼−6 to +18‰) suggest that the non-snowpack sulphate was principally derived from rock weathering. Furthermore, Ca2++Mg2+/SO42ˉ molar shows that sulphate acquisition in the meltwaters was controlled by two major processes: 1) coupled-sulphide carbonate weathering (molar ratio ∼ 2) and, 2) re-dissolution of secondary salts (molar ratio ∼ 1). The δ34S–SO4 = +19.4‰ > δ34S–S of rock, accompanied by increased sulphate concentration also indicates an input from re-dissolution of secondary salts. Overall, δ18O composition of these non-snowpack sulphate (−11.9 to −2.2‰) mostly stayed below the threshold δ18O value (−6.7 to −3.3‰) for minimum O2 condition, suggesting that certain proportion of sulphate was regularly supplied from anaerobic sulphide oxidation.","subitem_description_type":"Abstract"}]},"item_10001_description_6":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"高緯度北極域のSO42−の発生・消滅源やそれに関連する生物地球化学的プロセスを理解するために、冬季の積雪、夏の融解水、および岩石サンプルを採取し、主要イオン濃度および安定同位体比（δ18O, δ34S）を分析した。SO42−/Cl−比から、氷河底排水と氷河前縁の水路によって輸送される全SO42−のうち、87%以上が積雪以外の起源であることがわかった。積雪外起源のSO42−のδ34Sと周辺の岩石のδ34Sの値が近いことから、積雪外起源のSO42−は主に岩石の風化によってもたらされたと考えられる。さらに、Ca2+ + Mg2+/SO42−比から融解水中のSO42−濃度は主に、硫化物と炭酸塩の風化および、二次塩の再溶解の２つのプロセスによって制御されていると考えられる。SO42−濃度の増加をもたらす岩石中のδ34S−SO4 = +19.4‰はδ34S−Sよりも高く、これもまたSO42−が二次塩の再溶解によって供給されたことを示している。積雪外起源のSO42−のδ18Oのほとんどは、O2の下限状態の閾値よりも低い。これは、ある一定量のSO42−は定期的に嫌気的な硫化物の酸化によって供給されていることを示している。","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.2016.01.001"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"http://doi.org/10.1016/j.polar.2016.01.001","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":"A.H. Ansari","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"25782","nameIdentifierScheme":"WEKO"}]}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"Isotope","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Proglacial","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Subglacial","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Non-snowpack","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Sulphide oxidation","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Secondary salts","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":"Stable isotopic evidence for anaerobic maintained sulphate discharge in a polythermal glacier","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Stable isotopic evidence for anaerobic maintained sulphate discharge in a polythermal glacier"},{"subitem_title":"Stable isotopic evidence for anaerobic maintained sulphate discharge in a polythermal glacier","subitem_title_language":"en"}]},"item_type_id":"10001","owner":"27","path":["1493"],"pubdate":{"attribute_name":"公開日","attribute_value":"2016-03-16"},"publish_date":"2016-03-16","publish_status":"0","recid":"11043","relation_version_is_last":true,"title":["Stable isotopic evidence for anaerobic maintained sulphate discharge in a polythermal glacier"],"weko_creator_id":"27","weko_shared_id":-1},"updated":"2023-07-25T16:19:39.136407+00:00"}