Quaternary Science Reviews最新文献

{"title":"Environmental history in Western Anatolia (Turkey) since the Last Glacial Maximum","authors":"Mustafa Doğan ,&nbsp;Çetin Şenkul ,&nbsp;Jessie Woodbridge","doi":"10.1016/j.quascirev.2025.109296","DOIUrl":"10.1016/j.quascirev.2025.109296","url":null,"abstract":"<div><div>Mediterranean landscapes have been shaped by complex interactions between climate, land use and fire over multi-millennial timescales. Understanding past trajectories of change provides knowledge of how modern landscapes emerged, which can be valuable for their sustainable management. The aim of this study is to reconstruct environmental change in Western Anatolia (Turkey) through palaeoecological analysis of sediment from Buldan Yayla Lake (Denizli-Buldan) from the Last Glacial Maximum (LGM) to the present, using a high-resolution and multi-proxy dataset. To this end, fossil pollen, micro-charcoal, non-pollen palynomorphs, micro (μ)-XRF and radiocarbon analyses were applied to an ∼18 m sediment core from Buldan Yayla Lake (Denizli-Buldan). According to the fossil pollen record, forest presence was low during the LGM (21000-18000 cal. BP), with the lowest value recorded at 5 % during this period due to cold and dry climatic condition. Forest presence began to increase with the transition to the Post-LGM period. Rapid forest development and high forest presence were observed in the lake record from the transition to the LGM until the late Holocene. Forest development in Western Anatolia occurred approximately 4,000 years earlier than in Europe according to the age-depth model developed for this record, though if a hiatus exists, this could reflect a shift of at least 1,300 years. High forest abundance during the late Glacial period was interrupted during the Younger Dryas (YD) and during the dry climatic periods of 9250–8900 and 7700 cal. BP. The late Holocene period was characterized by intensive land use, specifically olive cultivation, which reached its highest level in the Roman Imperial Period (during the ancient city of Tripolis era), and the highest olive percentage recorded in Anatolia (38.4 %) was reached. Forests were generally dominated by oaks, with pine forests replacing oak forests in the last 1350 (cal. BP) years. Micro-charcoal and non-pollen palynomorph data were low in concentration between the LGM and Holocene and began to increase with the Holocene transition reaching their highest values during the late Holocene. This study provides a reconstruction of long-term environmental change in Western Anatolia and reveals a significant relationship between climate variability and shifts in vegetation patterns, particularly highlighting the increasing frequency of fires and changes in land use during certain periods. This finding serves as an important example for understanding the relationships between climate, vegetation, fire, and land use in the Mediterranean Basin.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"356 ","pages":"Article 109296"},"PeriodicalIF":3.2,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Abnormal reduction in Indian Monsoon rainfall during current warm period from the Holocene evolution perspective","authors":"Yafei Zou ,&nbsp;Luo Wang ,&nbsp;Wenying Jiang ,&nbsp;Enlou Zhang ,&nbsp;Guangxin Liu ,&nbsp;Haibo He ,&nbsp;Huiming Xu ,&nbsp;Shengrui Zhang ,&nbsp;Xiangzhong Li ,&nbsp;Bihui Zhang ,&nbsp;Long Han ,&nbsp;Houyuan Lu ,&nbsp;Hongbo Zheng ,&nbsp;Jule Xiao","doi":"10.1016/j.quascirev.2025.109316","DOIUrl":"10.1016/j.quascirev.2025.109316","url":null,"abstract":"<div><div>Since the onset of post-industrial global warming, there remains significant controversy over whether the evolution of the Indian Monsoon has deviated from the natural baseline of ‘rainfall and heat synchronization’. This question requires a deep understanding of the long-term correlation between temperature and monsoon rainfall changes. We selected Yunlong Lake, a climate-sensitive subalpine lake located on the southeastern margin of the Tibetan Plateau, to study this issue. We semi-quantitatively revealed warm-season temperature changes using the relative abundance of warm-preference planktic diatoms, namely <em>Achnanthidium catenatum</em> and <em>Aulacoseira granulata</em> var. <em>angustissima</em>, found in our diatom seasonal survey. Meanwhile, by examining the spatial pattern of surface diatom assemblages along the water depth gradient, two diatom-water depth transfer functions were constructed by using the modern analogue technique (MAT) and weighted average partial least squares regression (WAPLS) method, which were used to quantitatively reconstruct past lake water level changes. Comparison with independent modern monitoring records, the warm-water diatom indicators and the two diatom transfer functions suggest to be sensitive and reliable for reconstructing long-term temperature and rainfall changes in the Indian Monsoon domain. Based on this, and relying on the complete Holocene sedimentary records from the profundal zone of the lake, we reconstructed the warm-season temperature changes and lake water level fluctuations during the Holocene. Our reconstruction indicates that the temperature and rainfall in the Indian Monsoon domain exhibit a synchronous, ‘three-stage’ stepwise change over the multi-millennial scale of the Holocene. These stages are roughly marked by the climate events of 8.2 ka and 4.2 ka, with the maximum warm-season temperature and lake water level occurring during the middle Holocene. We find that the maximum rainfall and heat during the middle Holocene in this region roughly coincide with the peak of warm-season (summer-autumn) insolation. This may be related to the significant thermal difference between land and ocean at that time, suggesting a synchronous change in rainfall and temperature in Indian Monsoon domain over long timescales.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"356 ","pages":"Article 109316"},"PeriodicalIF":3.2,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New insights into marine-based paleo-ice sheet dynamics and glaciomarine depositional environment in an interfan area between ice stream-derived trough mouth fans, off west Svalbard","authors":"Akash Trivedi ,&nbsp;Sudipta Sarkar ,&nbsp;Stephan Ker ,&nbsp;Timothy A. Minshull ,&nbsp;Haflidi Haflidason","doi":"10.1016/j.quascirev.2025.109281","DOIUrl":"10.1016/j.quascirev.2025.109281","url":null,"abstract":"<div><div>Understanding the dynamic history of the marine-based paleo-Svalbard Ice Sheet provides critical insights into past climate change and the interactions between the ocean system and the cryosphere. High-resolution seismic imaging is needed to decipher the glacial history of the western Svalbard continental margin, which has experienced multiple glaciations throughout the Quaternary period. Glaciomarine sediments preserved on the continental margin provide a detailed record of these events. We integrate high-resolution airgun seismic (vertical resolution 5 m), and deep-towed transducer seismic data (vertical and horizontal resolutions 1 and 3 m, respectively) along with age constraints derived from a piston core to determine the seismic stratigraphic framework, depositional architecture, and sedimentation processes of the interfan area between the Kongsfjorden and Isfjorden Trough Mouth Fans (TMFs). Age constraints from seafloor drilling indicate that the build-up of the Kongsfjorden TMF began around 1.2 million years ago. Our data analysis reveals four distinct shelf-edge glaciations during the Weichselian period, dated at 120–110 ka, ∼90 ka, 61–54 ka, and ∼24 ka. These glacial units on the upper continental slope contain debris materials transported by slow-moving ice sheets. During maximum glacial expansion, iceberg calving created V-shaped indentations, and glaciogenic debris flows carved erosional troughs. Seismic interpretation and debris flow modeling aided in understanding the development of lensoid debris morphology, stacking patterns, and the evolution of debris lobes resulting from local variations in bottom topography. This study underscores the value of using multiple high-resolution seismic data sources to enhance our understanding of the glacial history and depositional processes in the interfan region.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"356 ","pages":"Article 109281"},"PeriodicalIF":3.2,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Large-scale vegetation shifts during substantial warming — Proxy-based biome reconstructions of MIS 6 and MIS 5e in Europe","authors":"Angela A. Bruch ,&nbsp;Andrea K. Kern ,&nbsp;Martina Stebich ,&nbsp;Nils Weitzel ,&nbsp;Michael Bolus","doi":"10.1016/j.quascirev.2025.109308","DOIUrl":"10.1016/j.quascirev.2025.109308","url":null,"abstract":"<div><div>The climatic changes from the penultimate glacial (MIS 6) to the last interglacial (MIS 5e) and their impact on regional vegetation and the environment inhabited by Neanderthals were profound. While terrestrial pollen data and vegetation reconstructions for MIS 5e are plenty, only few records are available for MIS 6 with no biome reconstruction published so far. Thus, 112 plant fossil sites from Europe and the Near East were compiled in this study, and qualitative and quantitative biome reconstructions were performed for MIS 6 and MIS 5e. This led to the first pollen based spatial reconstruction of vegetation cover for the penultimate glacial. As expected, vegetation patterns change severely and vegetation density increased with the substantial warming from MIS 6 to MIS 5e. Generally, in MIS 6 central and northern Europe was mainly covered by tundra/mammoth steppe, while temperate grassland, open woodland and shrubland dominated southern Europe. During MIS 5e, Europe was largely forested, with temperate forest in the north and warm forests and shrubland in the south. Still, climatic changes from the penultimate glacial to the last interglacial had regionally different effects on vegetation especially regarding the pace and severity of vegetation overturn. Comparison with published model outputs enables a sound spatial representation of large-scale vegetation patterns on megabiome level. Reducing the granularity of the data of both model and proxy-based biome reconstructions to megabiome level leads to a high level of agreement. Still, some discrepancies remain especially in the northern and easternmost parts of Europe, which could be due to dating issues. However, an underestimation of high latitude warming by the underlying climate models may also contribute to discrepancies in vegetation models compared to proxy data. Overall, the results reveal insights into the regional and local vegetation structure and may serve as an informed basis for spatial analyses of the environmental preferences of Neanderthals.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"356 ","pages":"Article 109308"},"PeriodicalIF":3.2,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Can we use springtails to improve our understanding of Antarctic Ice Sheet history? — A case study from Dronning Maud Land","authors":"Emma-Louise Cooper ,&nbsp;Mark I. Stevens ,&nbsp;Richard S. Jones ,&nbsp;Andrew N. Mackintosh","doi":"10.1016/j.quascirev.2025.109297","DOIUrl":"10.1016/j.quascirev.2025.109297","url":null,"abstract":"<div><div>The presence of unique biological archives (e.g., springtails, Arthropoda: Collembola) in Antarctic ice-free regions provides powerful evidence for testing assumptions about when and how the current ice sheet reached its present-day configuration. Springtails, where present, may suggest long-term (thousands to millions of years) ice-free conditions. Springtails might also provide crucial evidence of ice-free conditions in locations (often inland) where cosmogenic nuclide data are complicated by the influence of cold-based ice. We use published geological dating evidence from Dronning Maud Land (DML), East Antarctica, a region where numerous ice-free mountains (nunataks) currently protrude through the East Antarctic Ice Sheet, to test the utility of Antarctic springtails for understanding the evolution of ice-free terrain. We first categorise and plot all published cosmogenic nuclide data (ages, isotope concentrations) across DML using a series of distinct criteria to determine if they show 1) strong evidence for long-lived ice-free terrain, 2) moderate evidence for long-lived ice-free terrain, or 3) a complex burial-exposure history. Second, we compare the distribution of Antarctic springtails (requiring ice-free habitat to survive <em>in situ</em>) against this geological evidence, guided by their molecular data, where available. Our results imply that springtail populations coincide with areas adjacent to high (+2000 m a.s.l.) nunataks that have remained ice-free over timescales of thousands and in some cases millions of years, a finding that is supported by molecular information in the Sør Rondane Mountains, DML. Given the heterogeneous (and short-range endemic) presence of many springtails, they offer scope to improve knowledge of ice sheet changes more widely in Antarctica.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"356 ","pages":"Article 109297"},"PeriodicalIF":3.2,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Ecological environment of early-mid Holocene millet cultivation in northern China: Insights from the Xinglong site","authors":"Zhenwei Qiu ,&nbsp;Lina Zhuang ,&nbsp;Huiyun Rao ,&nbsp;Zhihua Yang ,&nbsp;Wenhui Liu ,&nbsp;Guanyu Wang","doi":"10.1016/j.quascirev.2025.109295","DOIUrl":"10.1016/j.quascirev.2025.109295","url":null,"abstract":"<div><div>The Xinglong site in Bashang Grassland has yielded crucial archaeological materials from the Paleolithic-Neolithic transition to mid-Neolithic period, including early-mid Holocene settlement and millet remains, providing critical insights into prehistoric human-environment interactions. This study analyzes pollen and phytolith data from the TG1E profile, revealing three distinct climatic stages following the Younger Dryas: 1) a moderately warm-humid phase with intermittent aridity during the Holocene onset (11,700–10,000 cal. a BP); 2) sustained warm-humid conditions in the early-mid Holocene (10,000–5000 cal. a BP); and 3) an progressive cool-arid phase during the mid-late Holocene (since 5000 cal. a BP). Vegetation transitioned from steppe to forest-steppe and subsequently to sparse wood grassland. The early-mid Holocene (ca. 10,000–7100 cal. a BP) presented optimal environmental conditions, though woody plant fluctuations suggest anthropogenic impacts of wood consumption from sedentism and ecological impacts of proto-agricultural practices in low-level food production system. Hydrological evidence indicates intermittent wetland presence near the site during 11,700–1800 cal. a BP, with significant water-level variability. Settlement patterns reveal strategic occupation of northwest hill-southeast aquatic basin micro-landscape, with millet cultivation emerging as a subsistence supplement to hunting-gathering by at least 8600 cal. a BP. Further multi-proxy analyses are required to elucidate environmental-cultural dynamics during this period.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"356 ","pages":"Article 109295"},"PeriodicalIF":3.2,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Formation conditions of coastal palaeolakes and associated abiotic aragonite deposition in the eastern Mediterranean during the upper Pleistocene","authors":"A.P. Karageorgis ,&nbsp;N. Kafousia ,&nbsp;M.V. Triantaphyllou ,&nbsp;J. Fietzke ,&nbsp;M.D. Dimiza ,&nbsp;T.J. Goepfert ,&nbsp;E. Koutsopoulou ,&nbsp;H. Kaberi ,&nbsp;G. Rousakis ,&nbsp;A. Gogou ,&nbsp;Th.D. Kanellopoulos ,&nbsp;S. Petrakis ,&nbsp;M. Karagiorgas ,&nbsp;V. Mavromatis","doi":"10.1016/j.quascirev.2025.109253","DOIUrl":"10.1016/j.quascirev.2025.109253","url":null,"abstract":"<div><div>During the Last Glacial Period (LGP), when sea level was up to ∼130 m lower than today, many of the currently semi-enclosed gulfs in the Eastern Mediterranean were isolated from the open sea, functioning as palaeolakes. This was the case for the western Saronikos Gulf in Greece, which was isolated from the Aegean Sea. The palaeogeographic evolution of this area was investigated by analyzing a 350 cm sediment core for grain size, inorganic geochemistry, mineralogy, and bulk <em>δ</em>¹³C and <em>δ</em>¹⁸O compositions. An age model was developed by combining radiocarbon (¹⁴C) and uranium-thorium (U/Th) dating methods. Integrating all available data and accounting for eustatic sea-level fluctuations, the sedimentary units of core SARC-18 cover the last glacial-interglacial cycle, spanning from 44.5 kyr BP to the present.</div><div>Two marine sedimentation intervals were identified, characterized by clay minerals, biogenic calcite, and light <em>δ</em>¹³C and <em>δ</em>¹⁸O isotopic signatures. These intervals are separated by a lacustrine sedimentation phase, marked by the exclusive deposition of authigenic aragonite and a significant enrichment in <em>δ</em>¹³C and <em>δ</em>¹⁸O. The latter elevated <em>δ</em>¹³C and <em>δ</em>¹⁸O values suggest carbonate mineral formation in an evaporative and saline environment under low temperatures (5–10 °C). Sedimentation rates during the marine intervals range from 5.8 to 6.0 cm kyr⁻¹, and are more than double during the lacustrine interval (11.9–14.0 cm kyr⁻¹) due to the extensive deposition of authigenic aragonite.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"356 ","pages":"Article 109253"},"PeriodicalIF":3.2,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Late-Holocene climate change and cultural evolution in Northwest India","authors":"Aakanksha Kumari ,&nbsp;Surabhi Verma ,&nbsp;Vabhika Rishi ,&nbsp;Bulbul Mehta ,&nbsp;Anubhav Singh ,&nbsp;Rajveer Sharma ,&nbsp;William Defliese ,&nbsp;Jonathan Holmes ,&nbsp;Yama Dixit","doi":"10.1016/j.quascirev.2025.109309","DOIUrl":"10.1016/j.quascirev.2025.109309","url":null,"abstract":"<div><div>The Late Holocene climate variability has played a major role in shaping the fate of civilizations globally including on the NW Indian plains. Abrupt climate drying at ∼4.2 ka BP is linked with the beginning of the deurbanization of the ancient Indus Civilization. However, little is known about the climatic conditions of the Ghaggar-Hakra (G-H) river interfluve region that the rural populations of the Indus Civilization inhabited. In this study, we present a high-resolution climate reconstruction of Late Holocene period using lake sediments from Kotla Dahar, located in the G-H interfluve. Our multi-proxy record suggests that the rural Late phase Indus populations declined in the face of weakened summer monsoon rainfall in the Neoglacial period from 3.3 to 2.5 ka BP. Archaeological investigations suggest that this is also the period when the Iron Age Culture established itself in this region. Our geochemical proxies further indicate that the monsoon recovered during the Roman Warm Period (RWP: 2.5- 1.6 ka BP) and the Medieval Climate Anomaly (MCA: 1.2-0.8 ka BP), which have been previously linked to the northward displacement of the Intertropical Convergence Zone modulated by Atlantic Meridional Oscillations (AMO)-related fluctuations in NH temperatures via its link with the Atlantic Thermohaline Circulation variations and associated interhemispheric heat transport fluctuations.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"356 ","pages":"Article 109309"},"PeriodicalIF":3.2,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Chilean margin sediments reveal millennial-scale Patagonian ice sheet fluctuations and Antarctic Circumpolar Current variability over the last 160,000 years","authors":"Matthew T. Illing ,&nbsp;Lorna J. Strachan ,&nbsp;Christopher M. Moy ,&nbsp;Christina R. Riesselman ,&nbsp;Vincent Rigalleau ,&nbsp;Helge W. Arz ,&nbsp;Frank Lamy","doi":"10.1016/j.quascirev.2025.109280","DOIUrl":"10.1016/j.quascirev.2025.109280","url":null,"abstract":"<div><div>Orbital- and millennial-scale changes in Southern Hemisphere climate and oceanographic conditions impact the Chilean offshore margin sedimentary depositional environment. Understanding palaeoenvironmental changes at the Chilean margin can shed light on changes in the western extent of the southern Patagonian Ice Sheet and velocity of the Cape Horn Current. Before now, records of western–southern Patagonian ice sheet were incomplete at a millennial-scale resolution back to MIS 6. Here, we present results from a composite sedimentary record from International Ocean Discovery Program (IODP) Site U1542 recovered from the south Chilean margin off the western Magellan Strait entrance at 53°S. We use sedimentary facies analysis, granulometry, X-ray fluorescence, and isotopic analysis across the uppermost ∼42 m of the stratigraphy to examine the interplay of along-slope oceanic bottom currents and down-slope ice sheet-derived flows at a millennial scale over the past 160 ka. We find the southern Chilean margin to be highly sensitive to terrestrial ice sheet extent, upper continental slope contour current velocity, and millennial-scale Southern Hemisphere climate change. We determine that the extent of the Patagonian Ice Sheet readily fluctuates, advancing to the Chilean continental shelf edge at least 22 times over the last 160,000 years and often retreating into the Chilean fjords. We reconstruct the flow speed of the Cape Horn Current, a northern branch of the Antarctic Circumpolar Current, using sortable silt and find it declines during glacial periods by 51% but rebounds during millennial-scale Antarctic warm periods. The millennial-scale changes observed within the core were likely driven by coupled shifts of the Southern Hemisphere westerly winds and Southern Ocean front migration.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"356 ","pages":"Article 109280"},"PeriodicalIF":3.2,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143629083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Palaeoenvironmental reconstruction of a fjord catchment NW Scotland, UK since the Last Glacial Maximum: A multi-geochemical approach","authors":"Jennifer Taylor ,&nbsp;David Selby ,&nbsp;Jeremy M. Lloyd ,&nbsp;Craig Smeaton ,&nbsp;James Bendle ,&nbsp;Mathew Allison ,&nbsp;Yuan Ling ,&nbsp;Luca Podrecca ,&nbsp;Bradley B. Sageman ,&nbsp;William Austin ,&nbsp;Sönke Szidat","doi":"10.1016/j.quascirev.2025.109311","DOIUrl":"10.1016/j.quascirev.2025.109311","url":null,"abstract":"<div><div>Loch Sunart, a fjord in NW Scotland, UK, records Late Glacial to Holocene sedimentation preserving palaeoenvironmental changes associated with the deglaciation of the British-Irish Ice Sheet (BIIS). This study combines a multi-proxy approach (osmium isotope analysis, carbon, sulphur and nitrogen elemental and isotopic analysis together with X-ray fluorescence, alkenone biomarkers and benthic foraminifera) to contribute to our understanding of the regional nature of BIIS deglaciation and enable the reconstruction of palaeoclimate variations since the last glacial. The observed patterns in the applied proxies collectively suggest that between ∼18 and 12.9 cal ka BP as the BIIS retreated, Loch Sunart experienced increased glacial meltwater discharge. Throughout this period, ¹⁸⁷Os/¹⁸⁸Os values are more radiogenic than the contemporaneous open ocean waters (∼1.04–1.06), which are interpreted to reflect an increase in glacially eroded sediment flux directly associated with glacial retreat following the Last Glacial Maximum. During the Younger Dryas, the fjord experienced a pause in glacially derived sediment reflected by a minimum in ¹⁸⁷Os/¹⁸⁸Os (∼1.1), which was followed by an increase in ¹⁸⁷Os/¹⁸⁸Os to more radiogenic values (∼1.3) at the end of the Younger Dryas. Coincident with changes in ¹⁸⁷Os/¹⁸⁸Os values, alkenone-based %C_37:4 values increase (40–60%), δ¹³C_org values decrease (−24‰) and foraminifera species indicative of restricted water renewal increased in abundance, suggesting a period of water stratification. A rapid shift in ¹⁸⁷Os/¹⁸⁸Os values toward a marine signature of ∼1 indicates that the basin experienced a breakdown in water stratification and renewed mixing from 5 cal ka BP. This interpretation is further supported by a coincident decrease in %C_37:4 to &lt;15%, and by distinct increases in wt% C, wt% N and δ¹³C_org. This multi-proxy approach, specifically integrating Os, provides additional insight to the BIIS in NW Scotland, in particular how such fjords can respond to glacial readvance during the Younger Dryas, which was not captured by previous studies.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"356 ","pages":"Article 109311"},"PeriodicalIF":3.2,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}