{"type": "FeatureCollection", "features": [{"id": "10.1594/pangaea.963212", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:19:37Z", "type": "Dataset", "title": "Stream water chemistry and landscape characteristics in Zackenberg Valley, NE Greenland summer 2021", "description": "The data contains water chemistry and spectral catchment NDVI for 14 streams in Zackenberg Valley in Northeast Greenland, sampled summer 2021 from 10th July to 15th September. 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. Clean water", "Nitrogen", " inorganic", " dissolved", "Chemistry", "Inductively Coupled Plasma - Mass Spectrometry (ICP-MS)", " PerkinElmer Instruments", " Optima 2000 DV", "Sum cations", "Natural Sciences", "Ammonium", "Potassium Silicon ratio", "Calcium Magnesium ratio", "Conductivity Meter", " WTW", " ProfiLine Cond 3110", "Longitude of event", "Silicon", "Lachat QuickChem 8500 flow injection autoanalyser", "Nitrogen", "organic", "water chemistry", "Iron", "Calcium/Magnesium ratio", "water", "Site", "Nitrate/Ammonium ratio", "Aspect", "Normalized Differenced Vegetation Index", " median", "Ammonium Nitrogen", "Normalized Differenced Vegetation Index", "Catchment area", "Slope", "PerkinElmer Instruments", "ProfiLine Cond 3110", "Shimadzu", "Date/Time of event", "Conductivity Meter", "Nitrate Ammonium ratio", "total dissolved", "Conductivity", "Event label", "Date Time of event", "Nitrogen", " inorganic", " dissolved/Nitrogen", " organic", " dissolved ratio", "15. 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.972409", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:19:37Z", "type": "Dataset", "title": "Organic carbon content, stable carbon isotope ratios, and lignin phenol fingerprint 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). Measurement of total organic carbon (TOC) and stable (d\u00b9\u00b3C) carbon isotopes were performed on 0.3 to 0.7 mg of samples on February 2022 using a Thermo DeltaQ isotope-ratio mass spectrometer (IRMS) coupled to a Thermo Flash 2000 Elemental Analyzer via a ConFlo IV interface at the at the Institute of Polar Sciences from the National Research Council of Italy (Bologna Section, Italy). The methodology for sample preparation followed Nieuwenhuize et al. (1994). Data on biomarkers (lignin phenols) were obtained extracting 2 to 3 mg of samples using a Microwave Accelerated Reaction System (MARS) 5 from CEM and following the methodology from Go\u00f1i & Montgomery (2000). The extracts were analysed using a Agilent 7890A gas chromatograph (GC) coupled to an Agilent 5975C mass spectrometer to identify and quantify the compounds of interest. Biomarkers extraction and analyses were carried out on March 2022 in the organic chemistry laboratories of the Ente Nazionale Idrocarburi (ENI)-National Research Council (CNR) of Italy Joint Research Center 'Aldo Pontremoli' (Lecce, Italy). Stable isotope ratios and biomarkers were used to gain insights on the main vegetation source of the plant debris and (biomarkers only) to investigate the degradation state of the terrestrial material.", "keywords": ["5 dihydroxybenzoic acid per unit mass organic carbon", "p Coumaric acid per unit mass organic carbon", "SWERUS C3", "p-Hydroxybenzaldehyde per unit mass organic carbon", "Permafrost", "p Hydroxybenzaldehyde per unit mass organic carbon", "Latitude of event", "Arctic", "Gas chromatography (GC", " Agilent 7890A) equipped with a mass selective detector (MSD", " Agilent 5975C) and a flame ionization detector (FID", " Agilent 7683B)", "p-Hydroxybenzoic acid per unit mass organic carbon", "p-Hydroxyacetophenone/p-hydroxyl phenols ratio", "bottom maximum", "top min", "total", "Sample code/label", "p-Coumaric acid per unit mass organic carbon", "Vanillic acid vanillin ratio", "Deglaciation", "p-Hydroxyl phenols/vanillyl phenols ratio", "Depth", " sediment/rock", " bottom/maximum", "Syringic acid per unit mass organic carbon", "p-Hydroxyl phenols per unit mass organic carbon", "Sample code label", "p Hydroxyl phenols per unit mass organic carbon", "Depth", " top/min", "Acetovanillone per unit mass organic carbon", "Vanillic acid per unit mass organic carbon", "p Hydroxybenzoic acid per unit mass organic carbon", "p Hydroxyacetophenone per unit mass organic carbon", "Vanillic acid/vanillin ratio", "sediment rock", "p Hydroxyl phenols vanillyl phenols ratio", "Syringyl phenols vanillyl phenols ratio", "Earth System Research", "\u03b413C", "Ferulic acid per unit mass organic carbon", "Syringaldehyde per unit mass organic carbon", "Vanillin per unit mass organic carbon", "Methane", "Piston corer", "Isotope ratio mass spectrometer", " Thermo", " DeltaQ; coupled to an Elemental Analyzer; Thermo Flash 2000 via a ConFlo IV", "Longitude of event", "Syringyl phenols per unit mass organic carbon", "organic", "Syringic acid/syringaldehyde ratio", "Cinnamyl phenols/vanillyl phenols ratio", "DEPTH", " sediment/rock", "5 dihydroxybenzoic acid vanillyl phenols ratio", "Oden", "Cinnamyl phenols vanillyl phenols ratio", "Agilent 7683B", "p-Hydroxyacetophenone per unit mass organic carbon", "Date/Time of event", "Acetosyringone per unit mass organic carbon", "3", "5-dihydroxybenzoic acid per unit mass organic carbon", "Depth", "Event label", "Date Time of event", "p Hydroxyacetophenone p hydroxyl phenols ratio", "Vanillyl phenols per unit mass organic carbon", "Elevation of event", "Syringyl phenols/vanillyl phenols ratio", "Agilent 5975C and a flame ionization detector FID", "Carbon", "Cinnamyl phenols per unit mass organic carbon", "Agilent 7890A equipped with a mass selective detector MSD", "DEPTH", "Syringic acid syringaldehyde ratio", "3", "5-dihydroxybenzoic acid/vanillyl phenols ratio", "Gas chromatography GC", "Thermo", "SWERUS-C3", "Isotope ratio mass spectrometer", "DeltaQ coupled to an Elemental Analyzer Thermo Flash 2000 via a ConFlo IV", "Carbon", " organic", " total"], "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.972409"}, {"rel": "self", "type": "application/geo+json", "title": "10.1594/pangaea.972409", "name": "item", "description": "10.1594/pangaea.972409", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1594/pangaea.972409"}, {"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"}}, {"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=Latitude+of+event&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=Latitude+of+event&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=Latitude+of+event&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Latitude+of+event&offset=3", "hreflang": "en-US"}], "numberMatched": 3, "numberReturned": 3, "distributedFeatures": [], "timeStamp": "2026-07-27T13:01:55.975506Z"}