{"type": "FeatureCollection", "features": [{"id": "10.1007/s11104-017-3369-8", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-22T16:15:07Z", "type": "Journal Article", "created": "2017-08-22", "title": "Thaw Pond Development And Initial Vegetation Succession In Experimental Plots At A Siberian Lowland Tundra Site", "description": "

Background and aims: Permafrost degradation has the potential to change the Arctic tundra landscape. We observed rapid local thawing of ice-rich permafrost resulting in thaw pond formation, which was triggered by removal of the shrub cover in a field experiment. This study aimed to examine the rate of permafrost thaw and the initial vegetation succession after the permafrost collapse. Methods: In the experiment, we measured changes in soil thaw depth, plant species cover and soil subsidence over nine years (2007\u20132015). Results: After abrupt initial thaw, soil subsidence in the removal plots continued indicating further thawing of permafrost albeit at a much slower pace: 1 cm y\u22121 over 2012\u20132015 vs. 5 cm y\u22121 over 2007\u20132012. Grass cover strongly increased after the initial shrub removal, but later declined with ponding of water in the subsiding removal plots. Sedges established and expanded in the wetter removal plots. Thereby, the removal plots have become increasingly similar to nearby \u2018natural\u2019 thaw ponds. Conclusions: The nine years of field observations in a unique shrub removal experiment at a Siberian tundra site document possible trajectories of small-scale permafrost collapse and the initial stage of vegetation recovery, which is essential knowledge for assessing future tundra landscape changes.

", "keywords": ["0301 basic medicine", "Ecology (including Biodiversity Conservation)", "Permafrost degradation", "Betula nana", "15. Life on land", "01 natural sciences", "Thermokarst", "Vegetation dynamics", "03 medical and health sciences", "13. Climate action", "Arctic tundra", "Environmental Sciences", "SDG 15 - Life on Land", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1007/s11104-017-3369-8"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Plant%20and%20Soil", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s11104-017-3369-8", "name": "item", "description": "10.1007/s11104-017-3369-8", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s11104-017-3369-8"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2017-08-22T00:00:00Z"}}, {"id": "10.1029/2020gb006719", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-09-22T16:17:01Z", "type": "Journal Article", "created": "2020-11-18", "title": "Stream Dissolved Organic Matter in Permafrost Regions Shows Surprising Compositional Similarities but Negative Priming and Nutrient Effects", "description": "Abstract

Permafrost degradation is delivering bioavailable dissolved organic matter (DOM) and inorganic nutrients to surface water networks. While these permafrost subsidies represent a small portion of total fluvial DOM and nutrient fluxes, they could influence food webs and net ecosystem carbon balance via priming or nutrient effects that destabilize background DOM. We investigated how addition of biolabile carbon (acetate) and inorganic nutrients (nitrogen and phosphorus) affected DOM decomposition with 28\uffe2\uff80\uff90day incubations. We incubated late\uffe2\uff80\uff90summer stream water from 23 locations nested in seven northern or high\uffe2\uff80\uff90altitude regions in Asia, Europe, and North America. DOM loss ranged from 3% to 52%, showing a variety of longitudinal patterns within stream networks. DOM optical properties varied widely, but DOM showed compositional similarity based on Fourier transform ion cyclotron resonance mass spectrometry (FT\uffe2\uff80\uff90ICR MS) analysis. Addition of acetate and nutrients decreased bulk DOM mineralization (i.e., negative priming), with more negative effects on biodegradable DOM but neutral or positive effects on stable DOM. Unexpectedly, acetate and nutrients triggered breakdown of colored DOM (CDOM), with median decreases of 1.6% in the control and 22% in the amended treatment. Additionally, the uptake of added acetate was strongly limited by nutrient availability across sites. These findings suggest that biolabile DOM and nutrients released from degrading permafrost may decrease background DOM mineralization but alter stoichiometry and light conditions in receiving waterbodies. We conclude that priming and nutrient effects are coupled in northern aquatic ecosystems and that quantifying two\uffe2\uff80\uff90way interactions between DOM properties and environmental conditions could resolve conflicting observations about the drivers of DOM in permafrost zone waterways.

", "keywords": ["0106 biological sciences", "550", "permafrost regions", "thermokarst", "vaikutukset", "ta1171", "geosciences", "ikirouta", "carbon cycling", "551", "ravinteet", "01 natural sciences", "nutrients", "cryosphere and high-latitude processes", "Biology", "Research Articles", "organic matter", "0105 earth and related environmental sciences", "compositional similarities", "nutrients and nutrient cycling", "hiilen kierto", "ravinteiden kierr\u00e4tys", "15. Life on land", "rivers", "6. Clean water", "nutrient effects", "13. Climate action", "orgaaninen aines", "1171 Geotieteet", "SDG 6 - Clean Water and Sanitation", "joet", "permafrost"]}, "links": [{"href": "https://digitalcommons.usu.edu/context/biology_facpub/article/2820/viewcontent/2020GB006719.pdf"}, {"href": "https://doi.org/10.1029/2020gb006719"}, {"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": "10.1029/2020gb006719", "name": "item", "description": "10.1029/2020gb006719", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1029/2020gb006719"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2021-01-01T00:00:00Z"}}, {"id": "10.1088/1748-9326/abee4b", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-22T16:17:32Z", "type": "Journal Article", "created": "2021-03-12", "title": "Preferential export of permafrost-derived organic matter as retrogressive thaw slumping intensifies", "description": "Abstract

Enhanced warming of the Northern high latitudes has intensified thermokarst processes throughout the permafrost zone. Retrogressive thaw slumps (RTS), where thaw-driven erosion caused by ground ice melt creates terrain disturbances extending over tens of hectares, represent particularly dynamic thermokarst features. Biogeochemical transformation of the mobilized substrate may release CO2 to the atmosphere and impact downstream ecosystems, yet its fate remains unclear. The Peel Plateau in northwestern Canada hosts some of the largest RTS features in the Arctic. Here, thick deposits of Pleistocene-aged glacial tills are overlain by a thinner layer of relatively organic-rich Holocene-aged permafrost that aggraded upward following deeper thaw and soil development during the early Holocene warm period. In this study, we characterize exposed soil layers and the mobilized material by analysing sediment properties and organic matter composition in active layer, Holocene and Pleistocene permafrost, recently thawed debris deposits and fresh deposits of slump outflow from four separate RTS features. We found that organic matter content, radiocarbon age and biomarker concentrations in debris and outflow deposits from all four sites were most similar to permafrost soils, with a lesser influence of the organic-rich active layer. Lipid biomarkers suggested a significant contribution of petrogenic carbon especially in Pleistocene permafrost. Active layer samples contained abundant intrinsically labile macromolecular components (polysaccharides, lignin markers, phenolic and N-containing compounds). All other samples were dominated by degraded organic constituents. Active layer soils, although heterogeneous, also had the highest median grain sizes, whereas debris and runoff deposits consisted of finer mineral grains and were generally more homogeneous, similar to permafrost. We thus infer that both organic matter degradation and hydrodynamic sorting during transport affect the mobilized material. Determining the relative magnitude of these two processes will be crucial to better assess the role of intensifying RTS activity in CO2 release and ecosystem carbon fluxes.With permafrost thaw, significant amounts of organic carbon (OC) previously stored in frozen deposits are unlocked and become potentially available for microbial mineralization. This is particularly the case in ice-rich regions such as the Yedoma domain. Excess ground ice degradation exposes deep sediments and their OC stocks, but also mineral elements, to biogeochemical processes. Interactions of mineral elements and OC play a crucial role for OC stabilization and the fate of OC upon thaw, and thus regulate carbon dioxide and methane emissions. In addition, some mineral elements are limiting nutrients for plant growth or microbial metabolic activity. A large ongoing effort is to quantify OC stocks and their lability in permafrost regions, but the influence of mineral elements on the fate of OC or on biogeochemical nutrient cycles has received less attention and there is an overall lack of mineral element content analyses for permafrost sediments. Here, we combine portable X-ray fluorescence (pXRF) with a bootstrapping technique to provide i) the first large-scale Yedoma domain Mineral Concentrations Assessment (YMCA) dataset, and ii) estimates of mineral element stocks in never thawed (since deposition) ice-rich Yedoma permafrost and previously thawed and partly refrozen Alas deposits. The pXRF method for mineral element quantification is non-destructive and offers a complement to the classical dissolution and measurement by optical emission spectrometry (ICP-OES) in solution. Using this method, mineral element concentrations (Si, Al, Fe, Ca, K, Ti, Mn, Zn, Sr and Zr) were assessed on 1,292 sediment samples from the Yedoma domain with lower analytical effort and lower costs relative to the ICP-OES method. The pXRF measured concentrations were calibrated using alkaline fusion and ICP-OES measurements on a subset of 144 samples (R2 from 0.725 to 0.996). The results highlight that i) the mineral element stock in sediments of the Yedoma domain (1,387,000\uffc2\uffa0km2) is higher for Si, followed by Al, Fe, K, Ca, Ti, Mn, Zr, Sr, and Zn, and that ii) the stock in Al and Fe (598 \uffc2\uffb1 213 and 288 \uffc2\uffb1 104\uffc2\uffa0Gt) is in the same order of magnitude as the OC stock (327\uffe2\uff80\uff93466\uffc2\uffa0Gt).

", "keywords": ["ddc:550", "late pleistocene- holocene", "thermokarst", "Science", "Q", "X-ray fluorescence", "01 natural sciences", "6. Clean water", "13. Climate action", "arctic", "alas", "Institut f\u00fcr Geowissenschaften", "thaw", "mineralogy", "late pleistocene \u2013 holocene", "bootstrapping technique", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.3389/feart.2021.703304"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Frontiers%20in%20Earth%20Science", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.3389/feart.2021.703304", "name": "item", "description": "10.3389/feart.2021.703304", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.3389/feart.2021.703304"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2021-09-03T00:00:00Z"}}, {"id": "10.34894/XK4LSU", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-22T16:19:33Z", "type": "Dataset", "title": "Porewater \u03b413CDOC Indicates Variable Extent Of Degradation In Different Talik Layers Of Coastal Alaskan Thermokarst Lakes", "description": "The data set includes the results of geochemical and sediment analyses on 7 sediment cores (63.2 cm - 86.5 cm) from two northern Alaskan thermokarst lakes (Emaiksoun and Unnamed Lake). The analysis include lake depth measurements, linescan imaging, XRF scans, grainsize distribution, loss on ignition, porewater content, magnetic susceptibility, dissolved organic carbon concentration, sediment density, stable carbon isotope measurements dissolved organic carbon and soil organic carbon and radiocarbon ages.", "keywords": ["Earth and Environmental Science", "13. Climate action", "Earth and Environmental Sciences", "Thermokarst Lake", "Dissolved Organic Carbon", "Permafrost", "15. Life on land", "Environmental Research", "Natural Sciences", "Geosciences", "Alaska"], "contacts": [{"organization": "Meisel, Ove", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.34894/XK4LSU"}, {"rel": "self", "type": "application/geo+json", "title": "10.34894/XK4LSU", "name": "item", "description": "10.34894/XK4LSU", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.34894/XK4LSU"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2021-01-01T00:00:00Z"}}, {"id": "10.34894/NPT2CF", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-09-22T16:19:33Z", "type": "Dataset", "title": "Data: Geochemical, sedimentological and microbial diversity in two thermokarst lakes of Far Eastern Siberia", "description": "The data set includes the results of biogeochemical and sedimentary analyses on 4 sediment cores (69.5 cm - 113 cm) from two thermokarst lakes in Far East Siberia near the town of Chokurdakh. The analysis include lake depth measurements, linescan imaging, XRF scans, grainsize distribution, loss-on-ignition, porewater content, magnetic susceptibility, dissolved organic carbon (DOC) concentration, sediment density, stable carbon isotope measurements of DOC and soil organic carbon and radiocarbon ages.", "keywords": ["Earth and Environmental Science", "Yedoma", "Arctic permafrost", "Thermokarst lakes; Far East Siberia; Arctic permafrost; Yedoma; SOC; Microbial Diversity", "Earth and Environmental Sciences", "Far East Siberia", "Thermokarst lakes", "SOC", "15. Life on land", "Environmental Research", "Natural Sciences", "Geosciences", "Microbial Diversity"], "contacts": [{"organization": "Meisel, Ove H., Rijkers, Ruud, Dean, Joshua F., In 'T Zandt, Michiel H., Van Huissteden, Ko, Maximov, Trofim C., Karsanaev, Sergey V., Marchesini Belelli, Luca, Goovaerts, Arne, Wacker, Lukas, Reichart, Gert-Jan, Bouillon, Steven, Welte, Cornelia U., Jetten, Mike S. M., Vonk, Jorien E., Dolman, Han,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.34894/NPT2CF"}, {"rel": "self", "type": "application/geo+json", "title": "10.34894/NPT2CF", "name": "item", "description": "10.34894/NPT2CF", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.34894/NPT2CF"}, {"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": "10.5281/zenodo.5171830", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-09-22T16:21:05Z", "type": "Dataset", "title": "Cryoturbation leads to iron-organic carbon associations along a permafrost soil chronosequence in northern Alaska", "description": "In permafrost soils, substantial amounts of organic carbon (OC) are potentially protected from microbial degradation and transformation into greenhouse gases by association with reactive iron (Fe) minerals. As permafrost environments respond to climate change, increased drainage of thaw lakes in permafrost regions is predicted. Soils will subsequently develop on these drained thaw lakes, but the role of Fe-OC associations in future OC stabilization during this predicted soil development is unknown. To fill this knowledge gap, we have examined Fe-OC associations in organic, cryoturbated and mineral horizons along a 5500-year chronosequence of drained thaw lake basins in Utqia\u0121vik, Alaska. By applying chemical extractions, we found that ~17 % of the total OC content in cryoturbated horizons is associated with reactive Fe minerals, compared to ~10 % in organic or mineral horizons. As soil development advances, the total stocks of Fe-associated OC more than double within the first 50 years after thaw lake drainage, because of increased storage of Fe-associated OC in cryoturbated horizons (from 8 to 75 % of the total Fe-associated OC stock). Spatially-resolved nanoscale secondary ion mass spectrometry showed that OC is primarily associated with Fe(III) (oxyhydr)oxides which were identified by 57Fe M\u00f6ssbauer spectroscopy as ferrihydrite. High OC:Fe mass ratios (>0.22) indicate that Fe-OC associations are formed via co-precipitation, chelation and aggregation. These results demonstrate that, given the proposed enhanced drainage of thaw lakes under climate change, OC is increasingly incorporated and stabilized by the association with reactive Fe minerals as a result of soil formation and increased cryoturbation.", "keywords": ["carbon", " iron", " thermokarst", " cryoturbation", "13. Climate action", "15. Life on land"], "contacts": [{"organization": "Joss, Hanna, Patzner, Monique S., Maisch, Markus, Mueller, Carsten W., Kappler, Andreas, Bryce, Casey,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.5281/zenodo.5171830"}, {"rel": "self", "type": "application/geo+json", "title": "10.5281/zenodo.5171830", "name": "item", "description": "10.5281/zenodo.5171830", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5281/zenodo.5171830"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2021-08-09T00:00:00Z"}}, {"id": "10.5281/zenodo.3832031", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-22T16:21:02Z", "type": "Dataset", "title": "Radiocarbon content of carbon dioxide, methane, dissolved organic carbon and particulate organic carbon from the northern permafrost region and other studies", "description": "The dataset includes 14C measurements of CO2, CH4, DOC and POC mostly from the northern permafrost region. Some other studies are included from sites not underlained by permafrost. The dataset focuses on 14C measurements of gaseous soil emissions and waterborne ecosystem C fluxes but the database also included C forms belowground, such as soil gases and pore water DOC.", "keywords": ["13. Climate action", "15. Life on land", "radiocarbon", " permafrost", " carbon dioxide", " methane", " dissolved organic carbon", " particulate organic carbon", " DOC", " POC", " thermokarst", " thaw"], "contacts": [{"organization": "Estop-Aragon\u00e9s, Cristian", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.5281/zenodo.3832031"}, {"rel": "self", "type": "application/geo+json", "title": "10.5281/zenodo.3832031", "name": "item", "description": "10.5281/zenodo.3832031", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5281/zenodo.3832031"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2020-05-18T00:00:00Z"}}, {"id": "20.500.11850/486770", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-09-22T16:22:30Z", "type": "Journal Article", "created": "2021-03-12", "title": "Preferential export of permafrost-derived organic matter as retrogressive thaw slumping intensifies", "description": "Abstract

Enhanced warming of the Northern high latitudes has intensified thermokarst processes throughout the permafrost zone. Retrogressive thaw slumps (RTS), where thaw-driven erosion caused by ground ice melt creates terrain disturbances extending over tens of hectares, represent particularly dynamic thermokarst features. Biogeochemical transformation of the mobilized substrate may release CO2 to the atmosphere and impact downstream ecosystems, yet its fate remains unclear. The Peel Plateau in northwestern Canada hosts some of the largest RTS features in the Arctic. Here, thick deposits of Pleistocene-aged glacial tills are overlain by a thinner layer of relatively organic-rich Holocene-aged permafrost that aggraded upward following deeper thaw and soil development during the early Holocene warm period. In this study, we characterize exposed soil layers and the mobilized material by analysing sediment properties and organic matter composition in active layer, Holocene and Pleistocene permafrost, recently thawed debris deposits and fresh deposits of slump outflow from four separate RTS features. We found that organic matter content, radiocarbon age and biomarker concentrations in debris and outflow deposits from all four sites were most similar to permafrost soils, with a lesser influence of the organic-rich active layer. Lipid biomarkers suggested a significant contribution of petrogenic carbon especially in Pleistocene permafrost. Active layer samples contained abundant intrinsically labile macromolecular components (polysaccharides, lignin markers, phenolic and N-containing compounds). All other samples were dominated by degraded organic constituents. Active layer soils, although heterogeneous, also had the highest median grain sizes, whereas debris and runoff deposits consisted of finer mineral grains and were generally more homogeneous, similar to permafrost. We thus infer that both organic matter degradation and hydrodynamic sorting during transport affect the mobilized material. Determining the relative magnitude of these two processes will be crucial to better assess the role of intensifying RTS activity in CO2 release and ecosystem carbon fluxes.With permafrost thaw, significant amounts of organic carbon (OC) previously stored in frozen deposits are unlocked and become potentially available for microbial mineralization. This is particularly the case in ice-rich regions such as the Yedoma domain. Excess ground ice degradation exposes deep sediments and their OC stocks, but also mineral elements, to biogeochemical processes. Interactions of mineral elements and OC play a crucial role for OC stabilization and the fate of OC upon thaw, and thus regulate carbon dioxide and methane emissions. In addition, some mineral elements are limiting nutrients for plant growth or microbial metabolic activity. A large ongoing effort is to quantify OC stocks and their lability in permafrost regions, but the influence of mineral elements on the fate of OC or on biogeochemical nutrient cycles has received less attention and there is an overall lack of mineral element content analyses for permafrost sediments. Here, we combine portable X-ray fluorescence (pXRF) with a bootstrapping technique to provide i) the first large-scale Yedoma domain Mineral Concentrations Assessment (YMCA) dataset, and ii) estimates of mineral element stocks in never thawed (since deposition) ice-rich Yedoma permafrost and previously thawed and partly refrozen Alas deposits. The pXRF method for mineral element quantification is non-destructive and offers a complement to the classical dissolution and measurement by optical emission spectrometry (ICP-OES) in solution. Using this method, mineral element concentrations (Si, Al, Fe, Ca, K, Ti, Mn, Zn, Sr and Zr) were assessed on 1,292 sediment samples from the Yedoma domain with lower analytical effort and lower costs relative to the ICP-OES method. The pXRF measured concentrations were calibrated using alkaline fusion and ICP-OES measurements on a subset of 144 samples (R2 from 0.725 to 0.996). The results highlight that i) the mineral element stock in sediments of the Yedoma domain (1,387,000\uffc2\uffa0km2) is higher for Si, followed by Al, Fe, K, Ca, Ti, Mn, Zr, Sr, and Zn, and that ii) the stock in Al and Fe (598 \uffc2\uffb1 213 and 288 \uffc2\uffb1 104\uffc2\uffa0Gt) is in the same order of magnitude as the OC stock (327\uffe2\uff80\uff93466\uffc2\uffa0Gt).