Boreas最新文献

{"title":"Weichselian history of the Fennoscandian Ice Sheet centre, Kvarken archipelago, western Finland—flow shifts, thermal regime and deglaciation","authors":"Niko Putkinen,&nbsp;Tapani Tervo,&nbsp;Adrian M. Hall,&nbsp;Juha P. Lunkka,&nbsp;Pertti Sarala,&nbsp;Olli Breilin,&nbsp;Jari Nenonen","doi":"10.1111/bor.70064","DOIUrl":"https://doi.org/10.1111/bor.70064","url":null,"abstract":"<p>Rapid thaw of the Earth's cryosphere in response to anthropogenic warming highlights the need to identify and understand the contrasting signatures of past ice-sheet stability and collapse. The Kvarken archipelago, western Finland, at the centre of the former Fennoscandian Ice Sheet (FIS), has been designated a UNESCO World Heritage site in recognition of the exceptional preservation of glacial landforms exposed by rapid (10 mm a⁻¹) postglacial isostatic uplift. Detailed mapping of hard and soft glacial bedforms allows reconstruction of ice sheet dynamics over the last glacial cycle. Striation orientation measurements (<i>n</i> ~ 1100) were made at 700 sites on Precambrian gneiss and granite bedrock surfaces around the present shorelines. The striation data are classified into relative age categories and broader striation arrays to identify ice-flow paths and then integrated with other directional indicators from overlying glacial sediments and landforms. The full data set reveals a sequence of six ice-flow stages, which are then placed in a revised event and chronostratigraphic model for the wider Ostrobothnia region. After a major glacial erosion phase in Kvarken in late MIS 6, ice sheets returned in MIS 4 and MIS 3. During brief sliding phases, till sheets were deformed and eroded, but cross-striations indicate that bedrock erosion was locally weak (&lt;0.5 m) until after the last glacial maximum. At 11.6 ka, summer temperatures in Fennoscandia rose abruptly by 3–6 °C, and large volumes of meltwater reached the glacier bed. At 10.7–10.5 ka, a fast ice-flow phase, the Gävle Oscillation, developed in the Bothnian basin. A &lt;400-year pulse of intense subglacial activity began in Kvarken, with abrupt and often pronounced switching of flow, production of new striation arrays, widespread erosion of till and bedrock and the formation of new soft bedforms. Existing till sheets were extensively glaciotectonically deformed into a young set of ribbed moraines. Local ice-flow events led to the development of low-relief megaflutings, drumlins and flutings. Bedrock was hydraulically damaged by large discharges of pressurized meltwater flowing in subglacial meltwater corridors, generating dense concentrations of large boulders. The ice margin retreated at 200–700, even 1000 m a⁻¹, with deposition of De Geer moraines in water depths of 220 m, before final deglaciation at 10.4–10.3 ka. Our Kvarken case study indicates that after slow erosion beneath stable ice sheet centres in MIS 4 and MIS 3/2, abrupt Early Holocene warming triggered ice sheet collapse and brought profound changes at the ice sheet bed over centennial time scales.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"55 3","pages":"670-701"},"PeriodicalIF":2.3,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.70064","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thorncliffe Formation: A proglacial to subglacial lacustrine basin sequence, Greater Toronto Region, Canada","authors":"David R. Sharpe,&nbsp;Charles E. Logan,&nbsp;Ross D. Knight,&nbsp;Andre J.-M. Pugin","doi":"10.1111/bor.70058","DOIUrl":"https://doi.org/10.1111/bor.70058","url":null,"abstract":"<p>Thorncliffe Formation (southern Ontario, Canada) sedimentary architecture, extent, facies trends, contacts and composition, combined with hydraulic data, define fundamental glacial basin depositional environments. Thorncliffe Formation (TF) comprises an ~50–100 m thick glaciofluvial–glaciolacustrine sediment sequence covering ~8000 km² east of Niagara Escarpment, from Lake Ontario north to the Canadian Shield. These sediments include aquifers that supply water to &gt;200 000 people, with significant untapped resources in the Greater Toronto Area. A comprehensive regional dataset enables reassessment of TF character, origin and age within a 3Dmodel of the basin sediments. The TF is primarily basin mud (~90%) with associated source channels (&lt;100 m deep) containing fining-upward sequences (~10%) of gravel, sand, rhythmites and diamicton. TF deposition began as proglacial lake organic-rich sediments accumulated in front of an advancing ice margin that obstructed Great Lakes drainage. Rising lake levels subsequently ponded meltwater against the ~100 m high Niagara Escarpment. When advancing ice overtopped the escarpment, TF basin evolved into a captured subglacial lake. Organic-poor, stratified TF subglacial lake sediments were generally deposited conformably with overlying regional Newmarket Till (NT). Integration of high-resolution subsurface data sets including seismic profiles, continuous cores, lake bluff sections and well monitoring data, enables the development of a robust conceptual framework for TF sediment architecture and depositional setting. This synthesis supports interpreting TF as high-energy, subaqueous channel-fan systems discharged from mapped inflow corridors into a muddy subglacial lake basin. The contact between glacial (NT) and inferred subglacial lake sediments (TF) exhibits interbedding, gradation, mounding and boulder scour features indicative of synchronous sedimentation beneath an ice-covered subglacial lake. Episodic ice lifting from and lowering back to the bed likely occurred during meltwater discharge events. TF data support established theory that subglacial lakes were common beneath continental ice sheets. TF sediment characteristics can help to identify subglacial lake settings in other glaciated terrain.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"55 3","pages":"717-750"},"PeriodicalIF":2.3,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.70058","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148534117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A North Greenland-wide in situ cosmogenic 14C ice sheet chronology since the Lateglacial","authors":"Anne Sofie Søndergaard,&nbsp;Astrid Rosenberg,&nbsp;Mads Faurschou Knudsen,&nbsp;Kristina Hippe,&nbsp;Marcus  Christl,&nbsp;Negar Haghipour,&nbsp;Olivia Steinemann,&nbsp;Kurt H. Kjær,&nbsp;Nicolaj Krog Larsen","doi":"10.1111/bor.70029","DOIUrl":"https://doi.org/10.1111/bor.70029","url":null,"abstract":"<p>Knowledge of the glacial history of the North Greenland Ice Sheet is crucial due to its high sensitivity to climate change. However, because the ice sheet in this region is predominantly cold-based, resulting in low erosion rates, using ¹⁰Be exposure dating to establish reliable ice sheet chronologies has proven very challenging due to nuclide inheritance. In this study, we measure 16 rock samples for their <i>in situ</i> ¹⁴C concentration, most of which already showed ¹⁰Be nuclide inheritance, resulting in apparent exposure ages pre-dating the most recent deglaciation. We combine our new results with seven already published <i>in situ</i> ¹⁴C exposure ages to build a North Greenland-wide <i>in situ</i> ¹⁴C ice sheet chronology based on a total of 20 boulder and three bedrock samples. Resulting <i>in situ</i> ¹⁴C ages range from 4.8 to 22.4 ka, and more than half of our <i>in situ</i> ¹⁴C exposure ages show signs of excess nuclides, pre-dating the most recent deglaciation at individual sample sites. We believe the excess nuclides could be a result of limited erosion during the Last Glacial Maximum (LGM) and a combination of pre-LGM exposure, supraglacial pre-deposition exposure and possibly thin ice cover. Our new large-scale <i>in situ</i> ¹⁴C data set contributes important knowledge on the glacial history of North Greenland and ice-bed properties in this region. Despite challenges, all <i>in situ</i> ¹⁴C exposure ages except two are younger than their ¹⁰Be counterpart, which highlights the potential and necessity of <i>in situ</i> ¹⁴C exposure dating in regions with cold-based ice and low erosion rates.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"55 2","pages":"327-339"},"PeriodicalIF":2.9,"publicationDate":"2026-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.70029","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147686284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Morphology and distribution of lakes under the Laurentide Ice Sheet: implications for ice flow dynamics","authors":"Sarah M. Principato,&nbsp;Carissa M. Mobley","doi":"10.1111/bor.70034","DOIUrl":"https://doi.org/10.1111/bor.70034","url":null,"abstract":"<p>This study examines the distribution and morphology of lakes under the Laurentide Ice Sheet (LIS) to investigate relationships with ice flow velocity, bedrock and basal thermal regime. Palaeo-ice streams and lobes were important components of the LIS, and properties of lakes in those regions are quantified at high resolution. Lake polygon shapefiles obtained from the HydroLAKES database contain data including water depth, volume and elevation. ArcGIS Pro is used to measure lake area, length, width, elongation, orientation, parallel conformity, density and packing. Approximately 982 282 natural lakes were identified in the region of North America covered by the maximum extent of the LIS during the Last Glacial Maximum. Density of lakes is highest in terrestrial regions surrounding Hudson Bay, and lake density decreases closer to the ice-sheet margin. Packing shows similar patterns to density with the exceptions of regions covered by remnants of proglacial lakes and non-glacial lakes. Close examination of density and packing under palaeo-ice streams and lobes shows statistically significant differences, with greater lake density and packing under palaeo-ice streams than lobes. Bedrock substrate also plays a key role in lake density and packing, with higher lake density under palaeo-ice streams flowing over the Canadian Shield compared with density and packing of lakes under palaeo-ice streams flowing on sedimentary bedrock. Lakes under palaeo-ice streams have higher parallel conformity than lobes, with orientation in both following ice flow paths. Elongation ratios of lakes under palaeo-ice streams and lobes are similar. Regions with high lake density are associated with intense ice scouring on the Canadian Shield, while regions with low lake density on sedimentary bedrock suggest a transition from initially high erosion of soft-bedded terrain followed by depositional processes dominating. High parallel conformity of lakes under palaeo-ice streams provides evidence for fast ice flow, similar to the presence of mega-scale glacial lineations. Quantifying lake morphology and distribution under the LIS provides a useful proxy for ice-sheet dynamics and may help better understand conditions under modern ice sheets, especially in regions of fast ice flow.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"55 2","pages":"422-442"},"PeriodicalIF":2.9,"publicationDate":"2026-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.70034","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147686130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fossil bears break free from inhibitory cascade constraints at least twice (Ursus minimus and Ursus deningeri) caused by dietary adaptations","authors":"Anneke H. van Heteren,&nbsp;A. Stefanie Luft","doi":"10.1111/bor.70044","DOIUrl":"https://doi.org/10.1111/bor.70044","url":null,"abstract":"<p>The inhibitory cascade model (ICM) predicts relative mammalian molar size and shows a relationship between relative molar size and diet. Bears do not follow the ICM. The aims of this study are to determine which bears, if any, adhere to the ICM, and to assess the evolution of dental development in bears to determine when and why their developmental pattern changed. Molars were measured with sliding callipers and occlusal surface area was taken as a proxy for molar size. An ICM morphospace was created with relative m2 and m3 size on the <i>x</i>- and <i>y</i>-axes, respectively. Our findings indicate that there are two deviations from the ICM. The first takes place between <i>Ursus boeckhi</i> and <i>Ursus minimus</i> and is attributed to a reduction in inhibitors in m1. We suggest the term ‘partial ICM’ to describe the developmental pattern of bears following the first deviation, as their distribution in morphospace runs parallel to the ICM yet is shifted towards a disproportionately larger m2 associated with increased omnivory. The second break takes place between <i>Ursus minimus</i> and <i>Ursus deningeri</i> and is caused by a reduction in inhibitors in m2 resulting in a shift towards disproportionately larger m3 associated with increased herbivory. The two breaks in the established developmental pattern of the ICM are linked to dietary adaptations that can be traced to environmental change, showing the effects of the environment on development on evolutionary time scales.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"55 2","pages":"503-516"},"PeriodicalIF":2.9,"publicationDate":"2026-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.70044","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147686339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unravelling the evolution of the Frébouge polygenetic cone in Val Ferret (Mont Blanc Massif)","authors":"Catharina Dieleman,&nbsp;Philip Deline,&nbsp;Susan Ivy Ochs,&nbsp;Patricia Hug,&nbsp;Jordan Aaron,&nbsp;Marcus  Christl,&nbsp;Naki Akçar","doi":"10.1111/bor.70042","DOIUrl":"https://doi.org/10.1111/bor.70042","url":null,"abstract":"<p>Proglacial settings in the Alps are typically polygenetic, often characterized by a complex and discontinuous interplay between glacial, fluvial and gravitational processes. These processes yield high volumes of sediments, which usually exceed their transportation capacity. The excessive proglacial sediment load leads to accumulation on slopes, and thus, to subsequent failures such as rock avalanches. The northern slopes of the Ferret and Veny valleys in the Mont Blanc Massif are home to several polygenetic cones and are a stunning field laboratory for the exploration of the interplay between the glacial, fluvial and gravitational processes. This study investigates a well-preserved polygenetic cone, the Frébouge cone, to disentangle the geomorphic processes that contributed to its formation and to reconstruct its evolution. To achieve these goals, detailed field and remote mapping, ¹⁰Be surface exposure dating, and runout modelling with DAN3D^® were used. The geomorphological map revealed complex interactions of glacial, fluvial, debris flow, as well as rock and snow avalanche processes. The established chronology indicates two major episodes of debris flows, the first one at <i>c</i>. 2 ka, and the second at <i>c</i>. 1 ka. In addition, a rock mass with a maximum volume of up to 12±3 Mm³ collapsed in the upper reaches of the cone at 1.3±0.1 ka and overran the cone, travelling more than 100 m up onto the opposite valley slope. Afterwards, the Frébouge Glacier overrode the cone several times leaving moraines and till, reaching its maximum extent <i>c</i>. 300 years ago. This study underscores the untwisting of the complex interaction of surface processes in the Alpine valleys, which are prone to hit the urban areas and infrastructures.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"55 2","pages":"454-475"},"PeriodicalIF":2.9,"publicationDate":"2026-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.70042","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147686076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Debris at the edge: sedimentological dynamics of Hintereisferner's evolving terminus and glacial forefield, Austrian Alps","authors":"Paulina Mejías Osorio,&nbsp;Ricarda Wohlschlägl,&nbsp;Thomas M. Vandyk,&nbsp;Sara Karbacher,&nbsp;Bethan Joan Davies,&nbsp;Daniel Paul Le Heron","doi":"10.1111/bor.70046","DOIUrl":"https://doi.org/10.1111/bor.70046","url":null,"abstract":"<p>The interaction between glaciers and the debris accumulating on their surfaces is critical as the Earth warms, with consequences for ice dynamics, hydrology and mass balance together with slope and sedimentary processes. Understanding this interaction is necessary since it influences ablation rates, sediment and meltwater pathways. The Hintereisferner glacier (Austrian Alps) has over a century's worth of observations and while mostly a clean and debris-free glacier, the last kilometre is becoming covered by debris. In this study, we present new geomorphological and sedimentological work, including glacier debris and forefield mapping that sheds light on the temporal and spatial accumulation of debris. The characterization of the forefield and terminus of the Hintereisferner permits identification of sediments and landforms, which were classified into landsystems. The subglacial/glaciofluvial dominated forefield has been exposed in the past 25 years, uncovering sections that demonstrate shifting channels with oscillating energy conditions in contact with till. The supraglacial landsystem consists of ablation cones and transverse ridges (both with low preservation potential), associated with crevasse infill by meltwater and englacial debris emergence, respectively. Additionally, the supraglacial system includes debris cover units with a paraglacial component that correspond to debris derived from both gravitational processes and heavy precipitation events, modifying the supraglacial meltwater system. It is expected that debris flows will be the main contributor of debris onto the glacier surface, that cauldron structures will continue to develop and eventually collapse, and most landforms will not be preserved as the forefield evolves. A coupled understanding of the recent deglacial landscape, together with the processes of debris accumulation on the glacier margin requires a rigorous mapping approach, which should be widely applicable to other mountain glaciated terrains.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"55 2","pages":"542-559"},"PeriodicalIF":2.9,"publicationDate":"2026-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.70046","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147686188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exploring dietary adaptations in Ursus minimus: a 3D geometric morphometric analysis of the mandible","authors":"Anneke H. van Heteren","doi":"10.1111/bor.70036","DOIUrl":"https://doi.org/10.1111/bor.70036","url":null,"abstract":"<p>The extinct bear <i>Ursus minimus</i>, which lived in Europe during the Pliocene and possibly Early Pleistocene, is considered the common ancestor of all modern Ursini. <i>U. minimus</i> is thought to have been omnivorous, with a preference for invertebrates. The present study aims to investigate its potential adaptations to this diet using 3D geometric morphometrics. Landmarks for 3D digitization of the mandible were selected to represent functional morphology. Extant and extinct Quaternary Ursidae were digitized as a comparative reference sample, followed by generalized Procrustes superimposition, with the data subsequently corrected for allometry through a pooled regression analysis. Principal component analysis was performed on the regression residuals and a phylogeny mapped onto the morphospace. The present study reveals that the mandibular morphology of <i>U. minimus</i> aligns more closely with omnivorous species than with insectivorous bears, challenging the idea of its insectivorous tendencies. As the common ancestor of modern Ursini, <i>U. minimus</i>' omnivorous dietary flexibility implies that <i>U. minimus</i> possessed a generalized adaptive strategy, which could have served as the foundation from which more specialized dietary forms later evolved.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"55 2","pages":"443-453"},"PeriodicalIF":2.9,"publicationDate":"2026-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.70036","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147686153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A limpet's eye view of post-glacial isostasy: fixed biological indicators provide new sea-level index points for the Mid-Holocene relative highstand in eastern Northern Ireland","authors":"Michael J. Simms,&nbsp;Paula J. Reimer","doi":"10.1111/bor.70048","DOIUrl":"https://doi.org/10.1111/bor.70048","url":null,"abstract":"<p>Empirical data for Holocene relative sea level (RSL) changes around the coast of north-eastern Ireland are sparse. Fixed biological indicators (FBIs), in the form of bioerosional marks made by limpets (<i>Patella</i>) and endolithic traces of other intertidal/subtidal organisms, are preserved significantly above present mid-tide level on a limestone cliff at Portmuck, in Co. Antrim, Northern Ireland. The limpet marks indicate a mid-tide level (MTL) for the Mid-Holocene relative highstand (MHRH) at +7.8±0.55 m relative to MTL today. This is &gt;3 m higher than previous empirical data for the region but is consistent with recent glacial isostatic adjustment (GIA) models. Shells of intertidal molluscs (<i>Patella</i>, <i>Littorina</i> and <i>Nucella</i>) recovered from fissures below the limpet marks show a significant spread of ¹⁴C ages, with the oldest a close match for the date of the MHRH but others as much as 2750 years younger. They indicate that RSL fell no more than ~2.5 m in that time from a highstand at ~6.3 cal. ka BP, a pattern comparable to that seen in southern Scotland but 1.5–2 ka later. This chronological offset is consistent with models that predict shoreline diachroneity in moving away from the centre of isostatic uplift in southern Scotland.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"55 2","pages":"585-599"},"PeriodicalIF":2.9,"publicationDate":"2026-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.70048","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147686358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Untangling nutrient co-regulation of ombrotrophic peatland development","authors":"Richard C. Chiverrell,&nbsp;Daniel N. Schillereff,&nbsp;Fiona E. Russell,&nbsp;Julie Valentine,&nbsp;Jason R. Kirby,&nbsp;David M. Wilkinson,&nbsp;John F. Boyle","doi":"10.1111/bor.70031","DOIUrl":"https://doi.org/10.1111/bor.70031","url":null,"abstract":"<p>Ombrotrophic peatlands are the largest terrestrial store of global carbon (C). While hydroclimate controls over peatland development are well known, the importance of nutrient fluxes has been researched less. Atmospheric nutrient fluxes to peatlands have increased with human activity in recent centuries. Here we explore the interplay of nutrient and hydroclimate drivers at Holcroft Moss (northwest England), a lowland ombrotrophic peatland typical of many across northern Europe. Parallel multi-proxy characterization of the organic matter composition and nutrient accumulation rates shows a sequence dominated by switches between fresh less decomposed layers and more decomposed peat containing abundant recalcitrant organic compounds. Hydroclimate variability governs much of the stratigraphy. Shifts to wetter conditions appear to trigger periods of reduced decomposition centred <i>c</i>. 3450, 2600–2500, 2225, 2060, 2000, 1825, 1650–1610, 1540, 1480, 1260, 1125, 1000, 740–720 and 600–550 cal. a BP. In addition, elevated N and P deposition beginning ~1000 cal. a BP, accelerating ~500 years cal. a BP, has led to changes in the co-behaviour between hydroclimate, peat composition and C accumulation rates. Long-term carbon/nutrient accumulation rates at Holcroft Moss are high compared to other UK peatlands measured to date. Higher nutrient fluxes from human activities will persist through the 21st century, with the implications for long-term peatland resilience and this important carbon sink unclear. Restoration and management of peatlands understandably focus on hydrology and vegetation, but we show a parallel need to consider nutrient deposition, which will vary site by site.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"55 2","pages":"384-404"},"PeriodicalIF":2.9,"publicationDate":"2026-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.70031","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147686265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}