{"_buckets": {"deposit": "6b0b80e8-cbb9-4275-87a6-ecc0cb99fcb1"}, "_deposit": {"id": "22253", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "22253"}, "status": "published"}, "_oai": {"id": "oai:nagoya.repo.nii.ac.jp:00022253"}, "item_10_biblio_info_6": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2016-06", "bibliographicIssueDateType": "Issued"}, "bibliographicPageEnd": "3459", "bibliographicPageStart": "3441", "bibliographicVolumeNumber": "13", "bibliographic_titles": [{"bibliographic_title": "Biogeosciences"}]}]}, "item_10_description_4": {"attribute_name": "\u6284\u9332", "attribute_value_mlt": [{"subitem_description": "Land use in a catchment area has significant impacts on nitrate eluted from the catchment, including atmospheric nitrate deposited onto the catchment area and remineralised nitrate produced within the catchment area. Although the stable isotopic compositions of nitrate eluted from a catchment can be a useful tracer to quantify the land use influences on the sources and behaviour of the nitrate, it is best to determine these for the remineralised portion of the nitrate separately from the unprocessed atmospheric nitrate to obtain a more accurate and precise quantification of the land use influences. In this study, we determined the spatial distribution and seasonal variation of stable isotopic compositions of nitrate for more than 30 streams within the same watershed, the Lake Biwa watershed in Japan, in order to use 17O excess (\u039417O) of nitrate as an additional tracer to quantify the mole fraction of atmospheric nitrate accurately and precisely. The stable isotopic compositions, including \u039417O of nitrate, in precipitation (wet deposition; n\u2009=\u2009\u202f196) sampled at the Sado-seki monitoring station were also determined for 3 years. The deposited nitrate showed large 17O excesses similar to those already reported for midlatitudes: \u039417O values ranged from +18.6 to +32.4\u202f\u2030 with a 3-year average of +26.3\u202f\u2030. However, nitrate in each inflow stream showed small annual average \u039417O values ranging from +0.5 to +3.1\u202f\u2030, which corresponds to mole fractions of unprocessed atmospheric nitrate to total nitrate from (1.8\u202f\u00b1\u202f0.3) to (11.8\u202f\u00b1\u202f1.8)\u202f% respectively, with an average for all inflow streams of (5.1\u202f\u00b1\u202f0.5)\u202f%. Although the annual average \u039417O values tended to be smaller in accordance with the increase in annual average stream nitrate concentration from 12.7 to 106.2\u202f\u00b5mol\u202fL\u22121, the absolute concentrations of unprocessed atmospheric nitrate were almost stable at (2.3\u202f\u00b1\u202f1.1)\u202f\u00b5mol\u202fL\u22121 irrespective of the changes in population density and land use in each catchment area. We conclude that changes in population density and land use between each catchment area had little impact on the concentration of atmospheric nitrate and that the total nitrate concentration originated primarily from additional contributions of remineralised nitrate. By using the average stable isotopic compositions of atmospheric nitrate, we excluded the contribution of atmospheric nitrate from the determined \u03b415N and \u03b418O values of total nitrate and estimated the \u03b415N and \u03b418O values of the remineralised portion of nitrate in each stream to clarify the sources. We found that the remineralised portion of the nitrate in the streams could be explained by mixing between a natural source with values of (+4.4\u202f\u00b1\u202f1.8) and (\u22122.3\u202f\u00b1\u202f0.9)\u202f\u2030 for \u03b415N and \u03b418O respectively and an anthropogenic source with values of (+9.2\u202f\u00b1\u202f1.3) and (\u22122.2\u202f\u00b1\u202f1.1)\u202f\u2030 for \u03b415N and \u03b418O respectively. In addition, both the uniform absolute concentration of atmospheric nitrate and the low and uniform \u03b418O values of the remineralised portion of nitrate in the streams imply that in-stream removal of nitrate through assimilation or denitrification had little impact on the concentrations and stable isotopic compositions of nitrate in the streams, except for a few streams in summer with catchments of urban/suburban land uses.", "subitem_description_type": "Abstract"}]}, "item_10_description_5": {"attribute_name": "\u5185\u5bb9\u8a18\u8ff0", "attribute_value_mlt": [{"subitem_description": "Published by Copernicus Publications on behalf of the European Geosciences Union.", "subitem_description_type": "Other"}]}, "item_10_identifier_60": {"attribute_name": "URI", "attribute_value_mlt": [{"subitem_identifier_type": "DOI", "subitem_identifier_uri": "http://doi.org/10.5194/bg-13-3441-2016"}, {"subitem_identifier_type": "HDL", "subitem_identifier_uri": "http://hdl.handle.net/2237/24367"}]}, "item_10_publisher_32": {"attribute_name": "\u51fa\u7248\u8005", "attribute_value_mlt": [{"subitem_publisher": "Copernicus Publications"}]}, "item_10_rights_12": {"attribute_name": "\u6a29\u5229", "attribute_value_mlt": [{"subitem_rights": "\u00a9 Author(s) 2016. This work is distributed\nunder the Creative Commons Attribution 3.0 License."}]}, "item_10_select_15": {"attribute_name": "\u8457\u8005\u7248\u30d5\u30e9\u30b0", "attribute_value_mlt": [{"subitem_select_item": "publisher"}]}, "item_10_source_id_7": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "1726-4170", "subitem_source_identifier_type": "ISSN"}]}, "item_creator": {"attribute_name": "\u8457\u8005", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "Tsunogai, Urumu"}], "nameIdentifiers": [{"nameIdentifier": "65916", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Miyauchi, Takanori"}], "nameIdentifiers": [{"nameIdentifier": "65917", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Ohyama, Takuya"}], "nameIdentifiers": [{"nameIdentifier": "65918", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Komatsu, Daisuke D."}], "nameIdentifiers": [{"nameIdentifier": "65919", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Nakagawa, Fumiko"}], "nameIdentifiers": [{"nameIdentifier": "65920", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Obata, Yusuke"}], "nameIdentifiers": [{"nameIdentifier": "65921", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Sato, Keiichi"}], "nameIdentifiers": [{"nameIdentifier": "65922", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Ohizumi, Tsuyoshi"}], "nameIdentifiers": [{"nameIdentifier": "65923", "nameIdentifierScheme": "WEKO"}]}]}, "item_files": {"attribute_name": "\u30d5\u30a1\u30a4\u30eb\u60c5\u5831", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_date", "date": [{"dateType": "Available", "dateValue": "2018-02-21"}], "displaytype": "detail", "download_preview_message": "", "file_order": 0, "filename": "Tsunogai_et_al_2016.pdf", "filesize": [{"value": "6.5 MB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_free", "mimetype": "application/pdf", "size": 6500000.0, "url": {"label": "Tsunogai_et_al_2016.pdf", "url": "https://nagoya.repo.nii.ac.jp/record/22253/files/Tsunogai_et_al_2016.pdf"}, "version_id": "5bc49e4b-9f36-4f5c-8f77-7a1c3f194911"}]}, "item_language": {"attribute_name": "\u8a00\u8a9e", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_resource_type": {"attribute_name": "\u8cc7\u6e90\u30bf\u30a4\u30d7", "attribute_value_mlt": [{"resourcetype": "journal article", "resourceuri": "http://purl.org/coar/resource_type/c_6501"}]}, "item_title": "Accurate and precise quantification of atmospheric nitrate in streams draining land of various uses by using triple oxygen isotopes as tracers", "item_titles": {"attribute_name": "\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_title": "Accurate and precise quantification of atmospheric nitrate in streams draining land of various uses by using triple oxygen isotopes as tracers"}]}, "item_type_id": "10", "owner": "1", "path": ["488/489/490"], "permalink_uri": "http://hdl.handle.net/2237/24367", "pubdate": {"attribute_name": "\u516c\u958b\u65e5", "attribute_value": "2016-06-17"}, "publish_date": "2016-06-17", "publish_status": "0", "recid": "22253", "relation": {}, "relation_version_is_last": true, "title": ["Accurate and precise quantification of atmospheric nitrate in streams draining land of various uses by using triple oxygen isotopes as tracers"], "weko_shared_id": null}