{"type": "FeatureCollection", "features": [{"id": "10.1029/2018gb005969", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:17:24Z", "type": "Journal Article", "created": "2018-12-14", "title": "Remobilization of Old Permafrost Carbon to Chukchi Sea Sediments During the End of the Last Deglaciation", "description": "Abstract<p>Climate warming is expected to destabilize permafrost carbon (PF\uffe2\uff80\uff90C) by thaw\uffe2\uff80\uff90erosion and deepening of the seasonally thawed active layer and thereby promote PF\uffe2\uff80\uff90C mineralization to CO2 and CH4. A similar PF\uffe2\uff80\uff90C remobilization might have contributed to the increase in atmospheric CO2 during deglacial warming after the last glacial maximum. Using carbon isotopes and terrestrial biomarkers (\uffce\uff9414C, \uffce\uffb413C, and lignin phenols), this study quantifies deposition of terrestrial carbon originating from permafrost in sediments from the Chukchi Sea (core SWERUS\uffe2\uff80\uff90L2\uffe2\uff80\uff904\uffe2\uff80\uff90PC1). The sediment core reconstructs remobilization of permafrost carbon during the late Aller\uffc3\uffb8d warm period starting at 13,000\uffc2\uffa0cal\uffc2\uffa0years before present (BP), the Younger Dryas, and the early Holocene warming until 11,000\uffc2\uffa0cal\uffc2\uffa0years BP and compares this period with the late Holocene, from 3,650\uffc2\uffa0years BP until present. Dual\uffe2\uff80\uff90carbon\uffe2\uff80\uff90isotope\uffe2\uff80\uff90based source apportionment demonstrates that Ice Complex Deposit\uffe2\uff80\uff94ice\uffe2\uff80\uff90 and carbon\uffe2\uff80\uff90rich permafrost from the late Pleistocene (also referred to as Yedoma)\uffe2\uff80\uff94was the dominant source of organic carbon (66\uffc2\uffa0\uffc2\uffb1\uffc2\uffa08%; mean\uffc2\uffa0\uffc2\uffb1\uffc2\uffa0standard deviation) to sediments during the end of the deglaciation, with fluxes more than twice as high (8.0\uffc2\uffa0\uffc2\uffb1\uffc2\uffa04.6\uffc2\uffa0g\uffc2\uffb7m\uffe2\uff88\uff922\uffc2\uffb7year\uffe2\uff88\uff921) as in the late Holocene (3.1\uffc2\uffa0\uffc2\uffb1\uffc2\uffa01.0\uffc2\uffa0g\uffc2\uffb7m\uffe2\uff88\uff922\uffc2\uffb7year\uffe2\uff88\uff921). These results are consistent with late deglacial PF\uffe2\uff80\uff90C remobilization observed in a Laptev Sea record, yet in contrast with PF\uffe2\uff80\uff90C sources, which at that location were dominated by active layer material from the Lena River watershed. Release of dormant PF\uffe2\uff80\uff90C from erosion of coastal permafrost during the end of the last deglaciation indicates vulnerability of Ice Complex Deposit in response to future warming and sea level changes.</p", "keywords": ["carbon isotope", "15. Life on land", "deglaciation", "climate change feedback", "01 natural sciences", "past carbon cycling", "13. Climate action", "SDG 13 - Climate Action", "SDG 14 - Life Below Water", "14. 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A similar PF\uffe2\uff80\uff90C remobilization might have contributed to the increase in atmospheric CO2 during deglacial warming after the last glacial maximum. Using carbon isotopes and terrestrial biomarkers (\uffce\uff9414C, \uffce\uffb413C, and lignin phenols), this study quantifies deposition of terrestrial carbon originating from permafrost in sediments from the Chukchi Sea (core SWERUS\uffe2\uff80\uff90L2\uffe2\uff80\uff904\uffe2\uff80\uff90PC1). The sediment core reconstructs remobilization of permafrost carbon during the late Aller\uffc3\uffb8d warm period starting at 13,000\uffc2\uffa0cal\uffc2\uffa0years before present (BP), the Younger Dryas, and the early Holocene warming until 11,000\uffc2\uffa0cal\uffc2\uffa0years BP and compares this period with the late Holocene, from 3,650\uffc2\uffa0years BP until present. Dual\uffe2\uff80\uff90carbon\uffe2\uff80\uff90isotope\uffe2\uff80\uff90based source apportionment demonstrates that Ice Complex Deposit\uffe2\uff80\uff94ice\uffe2\uff80\uff90 and carbon\uffe2\uff80\uff90rich permafrost from the late Pleistocene (also referred to as Yedoma)\uffe2\uff80\uff94was the dominant source of organic carbon (66\uffc2\uffa0\uffc2\uffb1\uffc2\uffa08%; mean\uffc2\uffa0\uffc2\uffb1\uffc2\uffa0standard deviation) to sediments during the end of the deglaciation, with fluxes more than twice as high (8.0\uffc2\uffa0\uffc2\uffb1\uffc2\uffa04.6\uffc2\uffa0g\uffc2\uffb7m\uffe2\uff88\uff922\uffc2\uffb7year\uffe2\uff88\uff921) as in the late Holocene (3.1\uffc2\uffa0\uffc2\uffb1\uffc2\uffa01.0\uffc2\uffa0g\uffc2\uffb7m\uffe2\uff88\uff922\uffc2\uffb7year\uffe2\uff88\uff921). These results are consistent with late deglacial PF\uffe2\uff80\uff90C remobilization observed in a Laptev Sea record, yet in contrast with PF\uffe2\uff80\uff90C sources, which at that location were dominated by active layer material from the Lena River watershed. Release of dormant PF\uffe2\uff80\uff90C from erosion of coastal permafrost during the end of the last deglaciation indicates vulnerability of Ice Complex Deposit in response to future warming and sea level changes.</p", "keywords": ["carbon isotope", "15. Life on land", "deglaciation", "climate change feedback", "01 natural sciences", "past carbon cycling", "13. Climate action", "SDG 13 - Climate Action", "SDG 14 - Life Below Water", "14. Life underwater", "Research Articles", "permafrost", "coastal erosion", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2018GB005969"}, {"href": "https://doi.org/20.500.14243/346511"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Global%20Biogeochemical%20Cycles", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "20.500.14243/346511", "name": "item", "description": "20.500.14243/346511", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/20.500.14243/346511"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-01-01T00:00:00Z"}}, {"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 (&lt;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 &amp; 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 (&lt;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"}}, {"id": "10.5281/zenodo.5592751", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:23:25Z", "type": "Dataset", "title": "Simulated terrestrial biosphere variables across Termination V (iLOVECLIM model)", "description": "The following files contain output data from the 32-kyr iLOVECLIM simulation covering Termination V: both sequences start at 436 kyr BP and end at 404 kyr BP with a yearly time step. Simulated_carbon_stock.nc: the average simulated carbon stock over latitudinal bands for each of the four carbon components (green biomass, structural biomas, slow Soil Organic Matter (SOM) and fat SOM) and the total carbon stock (sum of the four components). Simulated_tree_fraction.nc: the global simulated tree fraction (in %).", "keywords": ["Deglaciation", "Vegetation", "13. Climate action", "MIS 11", "Carbon cycle", "15. Life on land", "Climate model", "Termination V"], "contacts": [{"organization": ", Gabriel, , Nathaelle,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.5281/zenodo.5592751"}, {"rel": "self", "type": "application/geo+json", "title": "10.5281/zenodo.5592751", "name": "item", "description": "10.5281/zenodo.5592751", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5281/zenodo.5592751"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2021-10-29T00:00:00Z"}}, {"id": "b8ccd2f4-0adc-4abd-8bb8-eab9057159b2", "type": "Feature", "geometry": null, "properties": {"updated": "2024-09-25T13:42:56", "type": "Dataset", "language": "en", "title": "Quaternary Sediments 1:50,000 Ireland (ROI) ITM", "description": "In terms of time scale in geology, Quaternary is the present-day time and it began 2.6 million years ago. A lot of this time period relates to the Ice Age.   Quaternary sediments are the soft material that has been deposited during this time.  In Ireland much of this is related to the movement of glaciers and ice sheets. The main types of sediments shown on the map are tills (boulder clays), gravels, sands and peat. Over most parts of Ireland, these sediments cover the bedrock (solid rock at or below the land surface).   Geologists map and record information from the shallow sediments which can be seen at or near the surface. This information along with boreholes (a deep narrow round hole drilled in the ground), geophysical data (information on the physical properties of the Earth's surface and subsurface e.g. magnetics, gravity and electromagnetics) and geochemical data (chemical properties) is used to create the map. Areas are drawn on a map to show where sediments are found.   We collect new data to update our map and use data made available from other sources.  This map is to the scale 1:50,000 (1cm on the map relates to a distance of 500m).  It is a vector dataset. Vector data portray the world using points, lines, and polygons (areas).  The sediments data is shown as polygons. Each polygon holds information on the sediment type, sediment code and its unique identifier.", "formats": [{"name": "ESRI REST"}], "keywords": ["earth-science", "environment", "geologic-processes", "geological-survey-ireland", "geoscientificinformation", "glaciation", "ie", "ireland", "sediments", "soil", "subsoil", "topography"], "contacts": [{"organization": "https://data.gov.ie/organization/geological-survey-of-ireland", "roles": ["publisher"]}]}, "links": [{"href": "https://dcenr.maps.arcgis.com/apps/webappviewer/index.html?id=de7012a99d2748ea9106e7ee1b6ab8d5&amp%3Bscale=0"}, {"href": "https://gsi.geodata.gov.ie/downloads/Quaternary/Data/IE_GSI_Quaternary_Sediments_50K_IE26_ITM.zip"}, {"href": "https://gsi.geodata.gov.ie/server/rest/services/Quaternary/IE_GSI_Quaternary_Sediments_50K_IE26_ITM/MapServer"}, {"href": "https://gsi.geodata.gov.ie/server/services/Quaternary/IE_GSI_Quaternary_Sediments_50K_IE26_ITM/MapServer/WMSServer?request=GetCapabilities&service=WMS"}, {"href": "http://data.europa.eu/88u/dataset/b8ccd2f4-0adc-4abd-8bb8-eab9057159b2"}, {"rel": "self", "type": "application/geo+json", "title": "b8ccd2f4-0adc-4abd-8bb8-eab9057159b2", "name": "item", "description": "b8ccd2f4-0adc-4abd-8bb8-eab9057159b2", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/b8ccd2f4-0adc-4abd-8bb8-eab9057159b2"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"null": "date"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=glaciation&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=glaciation&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=glaciation&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=glaciation&offset=6", "hreflang": "en-US"}], "numberMatched": 6, "numberReturned": 6, "distributedFeatures": [], "timeStamp": "2026-07-26T22:53:50.049846Z"}