{"type": "FeatureCollection", "features": [{"id": "10.1594/pangaea.105302", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:19:37Z", "type": "Dataset", "title": "Alkenones and SST of sediment core GeoB3007-3", "keywords": ["Alkenone", " C37/C38m ratio", "Octatriaconta-16E", "23E-dien-2-one", "Alkenone", " C38:3Et+C38:2Et+C38:3Me+C38:2Me", "Octatriaconta-9E", "16E", "23E-trien-2-one", "unsaturation index UK38Me", "Sea surface temperature", "annual mean", "Octatriaconta-16E", "23E-dien-3-one", "Calculated from C37 alkenones Prahl Wakeham", "unsaturation index UK38", "C38 3Et C38 2Et", "23E trien 2 one", "University of Bremen GeoB", "C38 3Et C38 2Et C38 3Me C38 2Me", "Alkenone", " unsaturation index UK38", "Geosciences", " University of Bremen (GeoB)", "Octatriaconta 9E", "unsaturation index UK 37", "Calculated", "1987", "C37 C38 ratio", "MultiCorer", "Gas chromatography", "1993", "in Engel", "23E dien 2 one", "unsaturation index UK38Et", "sediment rock", "16E", "Calculated from C38 alkenones Brassel", "23E dien 3 one", "Natural Sciences", "C37 C38m ratio", "Geosciences", "Alkenone", " unsaturation index UK'37", "DEPTH", " sediment/rock", "Alkenone", " C38:3Et+C38:2Et", "Salinity correction factor", "Sea surface temperature", " annual mean", "Alkenone", " C37/C38 ratio", "AGE", "M31 3", "Calculated from C38 alkenones (Brassel", " 1993", " in Engel", " Organic Geochemistry)", "Meteor 1986", "Calculated from C37 alkenones (Prahl & Wakeham", " 1987)", "Alkenone", " unsaturation index UK38Et", "M31/3", "Meteor (1986)", "Alkenone", " C37/C38e ratio", "Calculated from C37 alkenones (Prahl & Wakeham", " 1987)", "23E trien 3 one", "C37 C38e ratio", "Alkenone", " unsaturation index UK38Me", "Octatriaconta-9E", "16E", "23E-trien-3-one", "Alkenone", " C38:3Me+C38:2Me", "DEPTH", "Organic Geochemistry", "Octatriaconta 16E", "Alkenone", "C38 3Me C38 2Me"], "contacts": [{"organization": "Budziak, D\u00f6rte, M\u00fcller, Peter J,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1594/pangaea.105302"}, {"rel": "self", "type": "application/geo+json", "title": "10.1594/pangaea.105302", "name": "item", "description": "10.1594/pangaea.105302", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1594/pangaea.105302"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2003-01-01T00:00:00Z"}}, {"id": "10.1594/pangaea.194648", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:19:37Z", "type": "Dataset", "title": "Physical oceanography at station JCR2_CTD24", "description": "Plymouth Marine Laboratory. 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(1938)", "Arctic", "Elemental analyzer EA", "Isotope ratio mass spectrometry-elemental analyzer (IRMS-EA)", " Thermo Finnigan", " Delta XP; Elemental analyzer (EA)", " Thermo Scientific", " FlashEA 1112", "Thermo Scientific", "Calculated", "Carbon Nitrogen ratio", "Carbon", " organic", " loading", "total", "Laboratory code label", "Minerals", "Multiple investigations", "Laboratory code/label", "Ionplus according to McIntyre et al 2017 and Haghipour et al 2018", "Minerals", " surface area", "error", "loading", "Nitrogen", " total", "Earth System Research", "\u03b413C", "FlashEA 1112", "Isotope ratio mass spectrometry elemental analyzer IRMS EA", "Nitrogen", "organic", "\u039414C", "MICADAS accelerator mass spectrometer (AMS)", " Ionplus; according to McIntyre et al. (2017) and Haghipour et al. 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We collected water samples for measuring water chemistry, and we determined landscape parameters using GIS based tools. The data was collected at three sampling periods in summer 2021 in the Zackenberg Research Station (74\u00b028'N, 20\u00b034'W). The area has a polar tundra climate with mean annual air temperature of -9.1 \u00b0C. Water chemistry (i.e. dissolved and particulate nitrogen, phosphorus, carbon; dissolved iron and silicate) and catchment characteristics (i.e. catchment area, altitude, slope, aspect, NDVI, snow cover) was measured for each of the 14 stream sites. Water chemistry samples were collected and analyzed using standard methods, and landscape characteristics were determined using GIS resources. The data was collected in order to study relationships between landscape characteristics and stream water chemistry. The water samples were collected by a team of two people, and the detailed methods are given below.", "keywords": ["inorganic", "median", "Nitrate Nitrogen", "Nitrogen", " inorganic", " dissolved/Nitrogen", " total dissolved ratio", "Nitrate", "Normalized Difference Vegetation Index", "Latitude of event", "Inductively Coupled Plasma Mass Spectrometry ICP MS", "Arctic", "Temperature", " water", "WTW", "Total organic carbon analyzer TOC VCPH TNM 1", "Total organic carbon analyzer (TOC-VCPH/TNM-1)", " Shimadzu", "Calculated", "dissolved ratio", "Nitrate/Nitrogen", " inorganic", " dissolved ratio", "total dissolved ratio", "Multiple investigations", "Temperature", "Nitrogen", " total dissolved", "Month", "dissolved", "specific", "streams", "6. 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Life on land", "Carbon", " organic", " dissolved", "dissolved Nitrogen", "Elevation of event", "Carbon", "rivers", "Snow coverage", "Greening", "Potassium/Silicon ratio", "Optima 2000 DV", "Nitrogen", " organic", " dissolved", "13. Climate action", "Discharge", "Conductivity", " specific", "Ammonium/Nitrogen", " inorganic", " dissolved ratio"], "contacts": [{"organization": "Riis, Tenna, Tank, Jennifer, Holmboe, Cecilie Marie Hartvig, Gim\u00e9nez-Grau, Pau, Mastepanov, Mikhail, Catalan, Nuria, Stott, David, Hansen, Birgitte, Kristiansen, S\u00f8ren M, Pastor, Ada,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1594/pangaea.963212"}, {"rel": "self", "type": "application/geo+json", "title": "10.1594/pangaea.963212", "name": "item", "description": "10.1594/pangaea.963212", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1594/pangaea.963212"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2023-01-01T00:00:00Z"}}, {"id": "10.1594/pangaea.972412", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:19:38Z", "type": "Dataset", "title": "Radiocarbon content and age of terrestrial material deposited at the paleo-delta of the Lena River at the transition to the Preboreal", "description": "The dataset was used to reconstruct the release of permafrost organic carbon from the watershed of the Lena River (Russia) between 11.1 and 11.7 calibrated thousand years Before Present (cal. kyr BP, Present = 1950 AD) and to model potential methane emissions from this carbon source. Data were obtained analyzing plant debris isolated from the low density fraction (<1.8 g/cm3) of muddy sediments from the Piston Core 23 (PC23). The sediment core was retrieved in July 2014 in the mid/outer-shelf of the Laptev Sea shelf (76\u00b0 10' 15.6''N; 129\u00b0 20' 13.2''E, water depth of 56 m) during Leg 1 of the SWERUS-C3 expedition (Swedish-Russian-U.S. Arctic Ocean \u2013 Investigation of Climate-Cryosphere-Carbon interactions). Radiocarbon (\u00b9\u2074C) content measurements were performed on 4 to 7 mg of sample on May 2022 using the Continuous Flow Accelerator Mass Spectrometry (CFAMS) system at the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) facility (Woods Hole Oceanographic Institution, Woods Hole, MA, USA). The \u00b9\u2074C content was used to calculate \u00b9\u2074C isotope ratios (D\u00b9\u2074C) and to reconstruct non-calibrated and calibrated \u00b9\u2074C ages of plant debris isolated from the sediment fraction with a density lower than 1.8 g/cm3. Additionally, D\u00b9\u2074C values were used to calculate the \u00b9\u2074C content of plant debris at time of sediment deposition (D\u00b9\u2074Ci) and the latter to obtain pre-depositional \u00b9\u2074C ages. The dataset allowed to reconstruct the age of the terrestrial plant material when deposited at the coring site and identify its provenance from within the permafrost OC pool (sub-surface soil within 1 m depth vs deep soil) after remobilization. The average pre-depositional \u00b9\u2074C age of plant debris was ultimately used to model methane emissions from relatively young permafrost organic carbon during the late deglaciation (ca. 10 to 15 cal. kyr BP).", "keywords": ["Piston corer", "SWERUS C3", "Longitude of event", "Age", " 14C", "\u039414C", "Fraction modern carbon", "Calendar age", "Permafrost", "DEPTH", " sediment/rock", "Latitude of event", "Oden", "Age", "Arctic", "AGE", "pre depositional", "bottom maximum", "top min", "Date/Time of event", "Calculated", "\u039414C", " initial", " error", "Fraction modern carbon", " error", "Sample code/label", "Deglaciation", "Depth", " sediment/rock", " bottom/maximum", "\u039414C", " error", "Age", " pre-depositional", " error", "Depth", "Event label", "Date Time of event", "Continuous Flow Accelerator Mass Spectrometry", "initial", "Sample code label", "Depth", " top/min", "Calendar age", " standard error", "Age", " error", "error", "Elevation of event", "sediment rock", "\u039414C", " initial", "14C", "standard error", "DEPTH", "Age", " pre-depositional", "Earth System Research", "SWERUS-C3", "Methane"], "contacts": [{"organization": "Sabino, Mathia, Gustafsson, \u00d6rjan, Wild, Birgit, Semiletov, Igor P, Dudarev, Oleg V, Ingrosso, Gianmarco, Tesi, Tommaso,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1594/pangaea.972412"}, {"rel": "self", "type": "application/geo+json", "title": "10.1594/pangaea.972412", "name": "item", "description": "10.1594/pangaea.972412", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1594/pangaea.972412"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2024-01-01T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Calculated&f=json", "hreflang": "en-US"}, {"rel": "alternate", "type": "text/html", "title": "This document as HTML", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Calculated&f=html", "hreflang": "en-US"}, {"rel": "collection", "type": "application/json", "title": "Collection URL", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main", "hreflang": "en-US"}, {"type": "application/geo+json", "rel": "first", "title": "items (first)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Calculated&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Calculated&offset=6", "hreflang": "en-US"}], "numberMatched": 6, "numberReturned": 6, "distributedFeatures": [], "timeStamp": "2026-07-27T12:58:30.530476Z"}