Quaternary Science Reviews最新文献

{"title":"Vegetation and climate changes during the Middle to Upper Palaeolithic transition in the southwestern Mediterranean: What happened to the last Neanderthals during Heinrich stadial 4?","authors":"Liz Charton , Nathalie Combourieu-Nebout , Adele Bertini , Vincent Lebreton , Odile Peyron , Mary Robles , Dael Sassoon , Marie-Hélène Moncel","doi":"10.1016/j.quascirev.2025.109345","DOIUrl":"10.1016/j.quascirev.2025.109345","url":null,"abstract":"<div><div>During the last glacial period, and particularly Marine Isotope Stage 3 (MIS 3, dated 60–27 ka), various abrupt and arid climate episodes impacted the northern hemisphere. These are known as Heinrich Stadials and are linked with major iceberg discharged in the North Atlantic. Heinrich Stadial 4 (HS4), one of the strongest of these events occurring around 39 ka BP, has raised numerous debates regarding its potential impact on the Middle to Upper Palaeolithic transition (MUPT) and Neanderthal extinction, especially in the Iberian Peninsula where late persistence of Neanderthals has been claimed beyond 40 ka BP. Although palynological studies from the Iberian margins have previously highlighted vegetation changes during this period, these have generally been of low resolution and thus, the environmental conditions during HS4 and the possible impact of this event on the last Neandertal populations are still poorly understood.</div><div>This study uses the marine core from Ocean Drilling Program (ODP) Site 976, located in the Alboran Sea, to provide new ultra-high-resolution analyses for the interval between 41 and 34 ka BP, including the Greenland Stadial 9 (GS9)/HS4 and the Greenland Interstadial 8 (GI8). The aim is to reconstruct vegetation and climate changes in southern Mediterranean with a resolution never achieved before and to discuss human occupation in the frame of these changes. Vegetation, climate changes and human occupation are discussed on the basis of 1) pollen analysis, 2) quantitative climate reconstructions based on a multi-method approach, and 3) maps of human occupation based on a synthesis of archaeological sites for western Mediterranean Europe in the 42–34 ka BP time interval. Results show a fast spread at centennial scale of steppe and semi-desert vegetation, with a typical three-phased pattern for the GS9 (HS4). This pattern is compatible with the results of various records from Greenland, southwestern Europe and Brazil. The description of these phases with an unpreceded resolution for the SW Mediterranean region supports the connection between the hydroclimatic changes in Greenland and lower latitudes, while the transition to the following GI8 climate amelioration displays a major vegetation instability that mimics the pattern of the last deglaciation at sub-millennial scale. The climate reconstruction shows cold conditions during HS4 and enhanced aridity mostly linked to the winter rainfall deficit caused by the abrupt disturbance of the Mediterranean seasonal regime of precipitations. The regional comparison with available palynological and paleoclimatic records from the western Mediterranean and the Atlantic sheds light on the spatial expression of the arid event, highlighting a south-westward trend in aridification in the Iberian Peninsula. The Alboran Sea appears as a critical area at the interface of the Atlantic and Mediterranean influences, recording the particular expression of fast climate oscillations in","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"359 ","pages":"Article 109345"},"PeriodicalIF":3.2,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143879161","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":"Drivers of late Quaternary lake level fluctuations of Khyargas Nuur, western Mongolia - glacial meltwater discharge or atmospheric moisture supply?","authors":"Dennis Wolf ,&nbsp;Frank Lehmkuhl ,&nbsp;Viktor Schaubert ,&nbsp;Neda Rahimzadeh ,&nbsp;Manfred Frechen ,&nbsp;Georg Stauch ,&nbsp;Ochirbat Batkhishig ,&nbsp;Karl Wegmann","doi":"10.1016/j.quascirev.2025.109373","DOIUrl":"10.1016/j.quascirev.2025.109373","url":null,"abstract":"<div><div>This study presents the first comprehensive late Quaternary chronology of lake level variations of the Khyargas Nuur (western Mongolia), based on a geomorphological approach supported by luminescence dating of relict shorelines and lacustrine sediments. The endorheic Khyargas Nuur in the Basin of Great Lakes is the ultimate sink of a sequential water and sediment cascade from the adjacent Mongolian Altai and Khangai Mountains. Several intercalated lakes repeatedly joined as one major paleolake, as evidenced by various morphological shoreline features. Situated in the mid-latitude Westerlies-dominated climate regime of Arid Central Asia and affected by the distant effects of the East Asian Summer Monsoon, the dynamic climate of the Basin of Great Lakes is determined by the co-evolution of these atmospheric circulation systems. Our observations comprise 11 distinct paleolake levels between +7 m and +188 m above modern lake level (aml). Calculations of paleolake extent and water volume emphasize the periodically enhanced inflow and gradual capture and abandonment of upstream-located lakes. In the regional to global paleoclimatic context, our results reveal three distinct phases of lake level dynamics: (i) A transgression to a maximum level of +129 m aml during Marine Isotope Stage 5c (104.7 ± 14.4–88.8 ± 12.7 ka) primarily controlled by increased atmospheric moisture supply from the Westerlies. (ii) A post-Last Glacial Maximum lake expansion to a level of +118 m aml around 14 ka, ultimately controlled by enhanced glacial meltwater discharge into the basin. This is followed by a lake regression throughout the late Glacial to early Holocene transition in response to a gradually decreasing meltwater supply and a drier climate. (iii) A late Holocene transgression to +15 m aml reflecting a general Holocene wetting trend across arid Central Asia, followed by small-scale level fluctuations post 2.6 ka.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"359 ","pages":"Article 109373"},"PeriodicalIF":3.2,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869462","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":"Late-Holocene hydrological cycling in the maritime Ross Sea in response to the El Niño-Southern Oscillation","authors":"Xin Chen ,&nbsp;Tianming Ma ,&nbsp;Zicheng Yu ,&nbsp;Shizhu Wang ,&nbsp;Lei Geng ,&nbsp;Zhaoru Zhang ,&nbsp;Zhangqin Zheng ,&nbsp;Steven D. Emslie ,&nbsp;Xiaodong Liu","doi":"10.1016/j.quascirev.2025.109370","DOIUrl":"10.1016/j.quascirev.2025.109370","url":null,"abstract":"<div><div>Hydrological dynamics in Antarctic coastal ice-free regions are an important part of climate variability that is crucial for terrestrial ecosystems in Antarctica. However, there is no geological record of hydrological changes in lakes in the Ross Sea region. Here we used analyses of surface lake sediment and living microbial mats to show that photoautotrophic organism-derived lipid hydrogen isotopes reflected the δ²H values of lake water (δ²H_water). We present a new record of δ²H_lipids from two lacustrine sediment cores collected from Inexpressible Island in the western Ross Sea to reconstruct δ²H_water values over the past 3000 years. The reconstructed δ²H_water values range from −103 to −35 ‰, and are significantly higher than δ²H_water values of precipitation (snow). On the basis of our modern observations, the slope of the linear regression between δ²H and δ¹⁸O in lake water is lower than both global and Antarctic meteoric water lines, suggesting strong lake evaporation at our study region. Our sensitivity modeling experiment showed that the strength of evaporation is closely linked with summer air temperature. Furthermore, δ²H_lipids showed similar patterns in variations with regional air temperature recorded by ice cores in the western Ross Sea, indicating that lake surface evaporation is mainly driven by air temperature. Generalized Additive Models (GAMs) and Locally Weighted Scatterplot Smoothing (LOESS) on δ²H_lipids and published climate records in the western Ross Sea indicate that higher δ²H_C16 values are corresponding to a relatively warmer climate at 2550-1350 cal yr BP (Phase 2) while lower values (corresponding to a relatively colder climate) are found at 3000-2550 cal yr BP (Phase 1) and 1350-0 cal yr BP (Phase 3). Higher lake evaporation was caused by the incursion of warm and moist air into the western Ross Sea as mediated by anomalous high-pressure over the Amundsen Sea that often occurs during the El Niño-dominant events. Our study supports the notion that large-scale atmospheric variability controlled by the tropical Pacific plays a major role in hydrological changes in the high latitude regions of Antarctica.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"359 ","pages":"Article 109370"},"PeriodicalIF":3.2,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143859716","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":"Mountain glaciers regulate the response of Tibetan Plateau dust activity to global climate change during the last glacial","authors":"Liangqing Cheng ,&nbsp;Hao Long ,&nbsp;Linhai Yang ,&nbsp;Jingran Zhang ,&nbsp;Yougui Song ,&nbsp;Zhong Chen ,&nbsp;Yubin Wu ,&nbsp;Zhibao Dong","doi":"10.1016/j.quascirev.2025.109375","DOIUrl":"10.1016/j.quascirev.2025.109375","url":null,"abstract":"<div><div>The Tibetan Plateau (TP) is an important source in the global atmospheric dust cycle, while its response of dust activity to global and regional climate change remains unclear. This study presented high-resolution last glacial records for dust activity, near-surface wind intensity, annual temperature, and precipitation from a 4.8-m thick sedimentary sequence from the Yarlung Tsangpo River valley in the southern TP. The results indicated that dust activity in the southern TP is mainly regulated by the near-surface wind intensity modulated by temperature. On the orbital scale, dust activity roughly responds to changes in the Northern Hemisphere summer insolation (NHSI). On the millennium scale, dust activity shows prominent ∼5-kyr cycles, responding to changes in the Atlantic Meridional Overturning Current (AMOC). Mountain glaciers in the southern TP could regulate the response amplitude of dust activity to the NHSI and AMOC through modulating regional temperature and associated wind intensity. This study highlights the impact of mountain glaciers on dust activity in the southern TP, which has important implications for understanding climate change on the TP and its response to global climate change.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"359 ","pages":"Article 109375"},"PeriodicalIF":3.2,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143863882","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":"Reconstructing the magnitudes of Holocene extraordinary floods in the upper Huai River, China","authors":"Lijun Shang ,&nbsp;Xiaochun Zha ,&nbsp;Chunchang Huang ,&nbsp;Yali Zhou ,&nbsp;Jiangli Pang ,&nbsp;Yuqin Li ,&nbsp;Zhaoduo Wang","doi":"10.1016/j.quascirev.2025.109371","DOIUrl":"10.1016/j.quascirev.2025.109371","url":null,"abstract":"<div><div>Palaeoflood natural archives provide vital insights for reconstructing extraordinary flood magnitudes and understanding climate change. Palaeohydrological investigations were conducted in the upper Huai River, North China Plain. A Holocene loess-paleosol sedimentary profile containing six palaeoflood slackwater deposits (SWD, SWD6–SWD1) was identified in the Luzhuang reach of the upper Huai River, where the Maoji River (a tributary of the Huai River) enters the Huai River. Sediment samples were collected for physicochemical analysis and optically stimulated luminescence (OSL) dating, respectively. The results revealed that the sedimentary accumulation consists of modern soil (MS), paleosol (S₀), aeolian loess (L₀), and transitional loess (L_t) sediments were predominantly silt (&gt;50 %), whereas SWDs were mainly sand (&gt;60 %). Geochemically, the elemental composition of SWDs was similar to that of MS, S₀, and L₀ sediments, but distinct from L_t. The MS, L₀, S₀, and L_t sediments demonstrated moderate weathering that was more pronounced than that of SWDs. Using OSL dating and stratigraphic chronological frameworks, six extraordinary palaeoflood events have been identified in the Luzhuang reach of the upper Huai River since approximately 8.5 ka in the Holocene. The palaeoflood magnitudes were reconstructed using the HEC-RAS hydraulic model, with six reconstructed palaeoflood peak discharges ranging from 9260 to 17,810 m³/s. Moreover, the sensitivity of the peak discharge calculated using the HEC-RAS model to the roughness coefficient was low, with a relative error of only −8.7 %–2.9 %. These extraordinary palaeoflood events corresponded to periods of climate change and instability, closely related to the El Niño-Southern Oscillation (ENSO). This study provides valuable insights into the effects of global change on regional hydrological systems.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"359 ","pages":"Article 109371"},"PeriodicalIF":3.2,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143859715","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":"Explosive volcanic history of Snæfellsjökull, West Iceland: Geochemistry, chronology and tephra distribution","authors":"Wesley R. Farnsworth ,&nbsp;Nína Aradóttir ,&nbsp;Skafti Brynjólfsson ,&nbsp;Sigrún D. Eddudóttir ,&nbsp;Egill Erlendsson ,&nbsp;Guðmundur H. Guðfinnsson ,&nbsp;Esther R. Guðmundsdóttir ,&nbsp;Maarit Kalliokoski ,&nbsp;Guðrún Larsen ,&nbsp;Rebekka H. Rúnarsdóttir ,&nbsp;Anthony H. Ruter ,&nbsp;Marie-Louise Siggaard-Andersen ,&nbsp;Sveinbjörn Steinþórsson ,&nbsp;Nicolaj K. Larsen ,&nbsp;Kurt H. Kjær","doi":"10.1016/j.quascirev.2025.109346","DOIUrl":"10.1016/j.quascirev.2025.109346","url":null,"abstract":"<div><div>Tephrochronology is firmly rooted in our knowledge of volcanic history. Iceland's Holocene explosive volcanic history is predominantly derived from investigations of soil sections and written archives, following the Norse Settlement <em>c.</em> 877 CE. Unsurprisingly, historically active volcanic provinces are most often the target of these tephrochronological investigations (e.g., Hekla, Katla, Bárðarbunga-Veiðivötn and Grímsvötn). Despite the risk of large explosive eruptions, some volcanic provinces – like Snæfellsjökull have received less attention. While no historical eruptions have been described from the glaciated central volcano, mapping from the late 1960s and early 1980s suggests there have been at least three explosive eruptions (producing silicic tephra) during the Holocene: Sn-1 (∼1.8 ka BP), Sn-2 (∼4.4 ka BP) and Sn-3 (∼8–10 ka BP). The presence of at least two of these tephra layers in European stratigraphic records has been suggested. Furthermore, other (cryptotephra) horizons in Europe exhibit similar geochemical properties to the Snæfellsjökull province, albeit different age estimates than Sn-1, -2, or -3. The tephrochronological potential of Snæfellsjökull tephra is limited by our lack of fundamental knowledge on the volcanic history and the potential range in tephra geochemistry from this stratovolcano. As a step towards addressing this knowledge gap, we present a well-dated record of tephra stratigraphy from lake Laugarvatn, near Snæfellsjökull. Furthermore, we review all Snæfellsjökull-like tephra deposits to improve understanding of Snæfellsjökull's post-glacial explosive volcanic activity affecting both regional and distal environments.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"359 ","pages":"Article 109346"},"PeriodicalIF":3.2,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143863881","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":"On the long and winding road: unravelling the late emergence of Neolithic agriculture in the Nile Delta","authors":"Xiaoshuang Zhao ,&nbsp;David Kaniewski ,&nbsp;Yanna Wang ,&nbsp;Nick Marriner ,&nbsp;Alaa Salem ,&nbsp;Said E. Alassal ,&nbsp;Yan Liu ,&nbsp;Feng Jiang ,&nbsp;Jing Chen ,&nbsp;Qianli Sun ,&nbsp;Maotian Li ,&nbsp;Ian Thomas ,&nbsp;Brian Finlayson ,&nbsp;Hader Sheisha ,&nbsp;Christophe Morhange ,&nbsp;Thierry Otto ,&nbsp;Frédéric Luce ,&nbsp;Zhongyuan Chen","doi":"10.1016/j.quascirev.2025.109368","DOIUrl":"10.1016/j.quascirev.2025.109368","url":null,"abstract":"<div><div>Despite the Nile Delta's abundant natural resources, the emergence of Neolithic agriculture did not evolve in tandem with neighboring regions, long raising questions about the underlying factors contributing to this delay. We analyzed pollen and non-pollen microfossils of three Predynastic sites (Buto - Tell el-Fara'in, Sais - Sa el-Hagar and Kom el-Khilgan) to track the environmental factors hindering the emergence and development of herding and farming in the Nile Delta before 7000 cal. BP. High-resolution-dated microfossils showed that during the African Humid Period, the delta experienced environmental instability, characterized by remarkably high Nile discharge and rapid sea-level rise, impeding early human occupation of the deltaic plain. Sea-level stabilization and declining Nile discharge beginning ca. 7000 years ago promoted herding as an opportunistic activity in coping with and exploiting the delta's uninhabitable environmental setting. This pastoral livelihood transitioned to sedentary farming that prevailed a millennium after the deltaic setting became stable.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"359 ","pages":"Article 109368"},"PeriodicalIF":3.2,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143854437","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":"Shelf-edge glaciation offshore of northeast Greenland during the last glacial maximum and timing of initial ice-sheet retreat","authors":"Colm Ó Cofaigh ,&nbsp;Jeremy M. Lloyd ,&nbsp;S. Louise Callard ,&nbsp;Catalina Gebhardt ,&nbsp;Katharina T. Streuff ,&nbsp;Boris Dorschel ,&nbsp;James A. Smith ,&nbsp;Timothy P. Lane ,&nbsp;Stewart S.R. Jamieson ,&nbsp;Torsten Kanzow ,&nbsp;David H. Roberts","doi":"10.1016/j.quascirev.2025.109326","DOIUrl":"10.1016/j.quascirev.2025.109326","url":null,"abstract":"<div><div>This paper presents new marine geophysical data and radiocarbon dated sediment cores to reconstruct the maximum extent of the Northeast Greenland Ice Stream (NEGIS) during the last glaciation and the timing of its initial retreat from the continental shelf. The NEGIS is the largest ice stream to drain the Greenland Ice Sheet (GrIS) today, and holds a sea-level equivalent of 1.1–1.4 m. It has undergone recent retreat but the longer-term history of NEGIS on the adjoining continental shelf is still relatively poorly constrained. Two cross-shelf bathymetric troughs, Westwind and Norske troughs, acted as pathways for offshore-flowing ice during the last glaciation but little is known about the acoustic stratigraphy, sedimentology and chronology of ice sheet retreat in the outer shelf sections of both troughs. Multibeam swath bathymetry and acoustic data from both troughs show flow parallel and flow transverse glacial landforms in the outer shelf sections of both troughs. Mega-scale glacial lineations in Westwind Trough record former streaming flow towards the shelf-edge. Grounding-zone wedges record episodic stabilisation during retreat from the shelf-edge. Sediment cores recovered subglacial tills and grounding-zone proximal sediments overlain by glacimarine sediments. The slope beyond Norske Trough is characterised by glacigenic debris flows typical of submarine slopes offshore of shelf-edge terminating palaeo-ice streams. Radiocarbon dates indicate that initial retreat of the ancestral NEGIS from the northeast Greenland shelf-edge was underway by 21.5–21.6 cal ka BP in Norske Trough and c. ≥19.0 cal ka BP in Westwind Trough. Retreat rates across the outer shelf were slow at 19–23 m a⁻¹ but increased across the inner shelf. Our data provides the first direct chronological support for a shelf-edge terminating GrIS offshore of northeast Greenland during the last glacial maximum and demonstrates this sector of the GrIS underwent relatively early retreat from the shelf-edge.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"359 ","pages":""},"PeriodicalIF":3.2,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143847766","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":"Geomagnetic moment variation over the last 4.4 Million years through high resolution paleointensity and 10Be production records along ocean sediment sequences","authors":"Jean-Pierre Valet ,&nbsp;Tatiana Savranskaia ,&nbsp;Quentin Simon ,&nbsp;Ramon Egli ,&nbsp;Franck Bassinot ,&nbsp;Nicolas Thouveny","doi":"10.1016/j.quascirev.2025.109367","DOIUrl":"10.1016/j.quascirev.2025.109367","url":null,"abstract":"<div><div>Beryllium-10 measurements along the northern Pacific sediment core collected from ODP site 1021 covering the interval 1.2–4.4 Millions of years (Ma) have been combined with previously published records of the last 1.2 Ma, in order to build the first 10Be/9Be (Be-ratio) record over the past 4.4 Ma. This new proxy-record of the dipole moment variation is compared with relative paleointensity (RPI) stacks. Together with the recent GTS timescale and δ18O composite curves, these records allow to compare and discuss the timings of field intensity and climatic changes over the last 5 Ma. We observe that in the last 3.2 Ma, i.e. the most precisely dated time interval, 8 over 9 reversals occurred near the culmination of interstadial or interglacial stages. The age models uncertainties as well as the eventual biases affecting the proxies series are analyzed, but their implication in this striking coincidence can reasonably be discarded. The possible influence of the obliquity on the geomagnetic field as well as the influence of the geomagnetic field on the climate are discussed in the light of former studies. Both hypotheses remain unanswered and controversial.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"359 ","pages":"Article 109367"},"PeriodicalIF":3.2,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143848286","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":"Insights into the sea-level history of the South Shetland Islands from ground penetrating radar on Livingston Island, Antarctica","authors":"Cameron Gernant ,&nbsp;Alexander R. Simms ,&nbsp;Regina DeWitt ,&nbsp;Brittany Theilen ,&nbsp;Christopher N. Garcia ,&nbsp;Michael Goebel","doi":"10.1016/j.quascirev.2025.109363","DOIUrl":"10.1016/j.quascirev.2025.109363","url":null,"abstract":"<div><div>Sea-level changes in polar environments are important for understanding the timing and magnitude of past ice-sheet changes. Most of the few records of such past sea-level changes in Antarctica are those derived from raised beach ridges. Many studies using raised beach ridges to reconstruct past sea levels across Antarctica commonly assume that they only record falling sea levels. However, their internal architecture may contain a record of other oscillations in relative sea-level (RSL) change. In this study, we examine the internal architecture of a well-developed set of raised beach ridges on Livingston Island of the Antarctic Peninsula using 10+ km of ground penetrating radar (GPR). Recalibrated published radiocarbon ages are used in combination with new optically stimulated luminescence (OSL) ages to compare beach morphology and stratigraphy to the glacial history of the region. Within this flight of raised beach ridges, evidence was found for both regressive and transgressive depositional patterns marked by progradational seaward dipping facies deposited during periods of RSL fall followed by erosion and deposition of landward dipping overwash and aggrading beds during interpreted periods of RSL rise. This succession is routinely located over a notch in the bedrock interpreted to represent a wave-cut feature. The ages of raised beach ridges underlain by wave-cut notches and composed of landward-dipping strata correlate with known Holocene ice advances at &lt;500, ∼2000, and ∼5000 cal yrs BP. We propose that these transgressive phases are the result of glacial-isostatic adjustment (GIA). This GIA hypothesis further supports recent assertions of a much more dynamic RSL history for Antarctic coastlines, which may contaminate the Last Glacial Maximum RSL signal across Antarctica.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"359 ","pages":"Article 109363"},"PeriodicalIF":3.2,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143848289","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}