Quaternary Science Reviews最新文献

{"title":"Tracking orbital and suborbital climate variability in the westernmost Mediterranean over the past 13,000 years: New insights from paleoperspectives on marine productivity responses","authors":"Ricardo D. Monedero-Contreras ,&nbsp;Francisca Martínez-Ruiz ,&nbsp;Francisco J. Rodríguez-Tovar ,&nbsp;José M. Mesa-Fernández ,&nbsp;Francesca Sangiorgi","doi":"10.1016/j.quascirev.2024.109001","DOIUrl":"10.1016/j.quascirev.2024.109001","url":null,"abstract":"<div><div>This study presents a comprehensive analysis of a sediment record from the Western Alboran Basin (core GP04PC), utilizing palynological and geochemical tools to investigate marine productivity responses to orbital and suborbital climate variability over the past 13,000 years. High productivity during the Younger Dryas humid phase (∼12.4–11.7 ka) and the Holocene humidity optimum (∼10.5–8.5 ka) was driven by increased local river discharges resulting from rapid mountain glaciers melting and enhanced regional precipitation. During the late Holocene, frequent flood events linked to negative North Atlantic Oscillation (NAO) incursions potentially led to multicentennial-scale productivity increases. The findings indicate that periods characterized by wet regional conditions and increased river run-off, influenced by orbital (e.g., insolation cycles) and suborbital factors (e.g., NAO and Atlantic Meridional Overturning Circulation changes), consistently enhanced marine productivity in the Western Alboran Basin. The study also reveals that the current high productivity and carbon export in the Western Alboran Basin are maintained by active upwelling and downwelling systems driven by a persistent positive NAO phase following the southward migration of the Intertropical Convergence Zone (ITCZ) that occurred around 6.5 ka. Furthermore, geochemical proxies support a strong detrital influence on trace metal concentrations, including barium (Ba), in deep Western Alboran sediments during the Holocene. This limits the use of Ba/Al ratios for accurately reconstructing productivity changes and highlights the importance of dinocyst analysis as a complementary tool for robust marine productivity reconstructions in this region. These observations provide valuable paleoperspectives on marine ecosystem responses to climate variability, contributing to the development of robust long-term productivity models essential for adapting to ongoing environmental changes in the region, and demonstrating the strong influence of North Atlantic climate and ocean dynamics on centennial-scale productivity oscillations in this region.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 109001"},"PeriodicalIF":3.2,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432873","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":"A high-resolution tephra record from Castiglione maar reveals the timing and unveils cryptic eruptions over the most recent volcanic activity at Colli Albani, central Italy","authors":"Bianca Scateni ,&nbsp;Gianfranco Di Vincenzo ,&nbsp;Giuseppe Re ,&nbsp;Biagio Giaccio ,&nbsp;Gaia Siravo ,&nbsp;Alessandra Smedile ,&nbsp;Patrizia Macrì ,&nbsp;Alessio Di Roberto","doi":"10.1016/j.quascirev.2024.108989","DOIUrl":"10.1016/j.quascirev.2024.108989","url":null,"abstract":"<div><div>Integrating proximal and medial-distal tephra records from continuous sedimentary archives has recently proven to be crucial for obtaining more complete and highly resolved stratigraphic and chronological histories of explosive activity, allowing a detailed and accurate assessment of volcanic hazards. The sedimentary succession from the Castiglione maar, about 20 km east of Rome, hosts a long and continuous lacustrine record extending back to ca. 365 ka, including a number of tephra layers derived from the explosive activity of peri-Tyrrhenian volcanic centres. An integrated tephrochronological investigation, which combines stratigraphic, textural, mineralogical, geochemical and ⁴⁰Ar/³⁹Ar geochronological analyses, was conducted on six tephra layers occurred between 11 and 15 m-depth of the Castiglione composite section. This section records the history of the most recent explosive activity of the Colli Albani volcano and relates to the Albano maar. Results reveal that the Albano maar volcanic history actually comprises six explosive events that are younger than previously thought and occurred in a narrower time interval. Specifically, ⁴⁰Ar/³⁹Ar ages determined on four of the six tephra, along with the modelled ages for the remaining two, indicate that the eruptive activity of the last sub-cycle of the Albano maar lasted 3.4 +0.4/-0.6 ka, and occurred between 37.71 ± 0.34 ka (⁴⁰Ar/³⁹Ar age of the first eruption) and 34.34 +0.25/-0.45 ka (modelled age of the last eruption). Results refine the history of the most recent explosive activity at Colli Albani volcano and underscore the importance of studying tephra preserved in medial-distal continuous sedimentary archives for a comprehensive reconstruction of the eruptive history. Based on the data collected, the previously unrecognised explosive eruptions were likely of medium magnitude but sufficiently large to produce highly fragmented and widely dispersed ash. We argue that these new findings should be considered for an updated long-term hazard assessment of the Colli Albani volcanic area. Results, and especially the new high-precision ages, also allow to improve the tephrochronological framework in the dispersal area of the Albano tephra, including the iconic paleoclimatic archives of Monticchio and Fucino.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108989"},"PeriodicalIF":3.2,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418833","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":"Surges of the Black Rapids Glacier tracked climate over the last 600 years","authors":"D.H. Mann ,&nbsp;P.R. Wilson ,&nbsp;B.V. Gaglioti ,&nbsp;P. Groves ,&nbsp;M.E. Young","doi":"10.1016/j.quascirev.2024.108969","DOIUrl":"10.1016/j.quascirev.2024.108969","url":null,"abstract":"<div><div>Deposits of surge-type glaciers are widespread in the glacial geologic record; however, it is unclear how climate changes occurring at time scales of decades to centuries affect surge-type glaciers. Here we reconstruct the history of the Black Rapids Glacier (BRG) in the eastern Alaska Range since AD 1400 using a combination of geomorphology, stratigraphy, lichenometry, radiocarbon dating, and dendrochronology. Moraines in the glacier's foreland record four advances, all of which left deposits typical of surging glaciers. A surge in the AD 1600s dammed a lake which drained in an outburst flood ca. AD 1703-04. Another outburst flood from a larger glacier-dammed lake occurred in the AD 1400s. Based on the BRG's observed glaciology and its history over the last several centuries, its surge cycles have varied between 80 and 120 years. Between AD 1400 and 1900, the most extensive surges of the BRG coincided with minima in the Seuss / de Vries solar cycle when non-surging glaciers in the region also advanced. Synchroneity between the BRG, solar minima, and non-surging glaciers is surprising given that the terminus of the BRG was largely unresponsive to climate for 80–120 years between surges. One explanation is that the BRG's surge cycle shortened during the Little Ice Age (LIA, ca. AD 1300–1900) to the point that its climate-response lag resembled that of neighboring, non-surging glaciers. Although the reconstructed chronology of the BRG shows no indication of the surge cycle decreasing during the LIA, fading of the record with time makes it difficult to exclude this possibility. Another explanation is that the BRG's 80- to 120-year cycle is the result of tuning by the solar cycle over the course of millennia. Tuning occurred when quiescent phases that coincided with solar minima were shortened because of faster replenishment of the glacier's reservoir zone. The opposite occurred when the glacier's quiescent phases coincided with solar maxima. The net result was to align the surge cycle of the BRG with solar minima. Some combination of shortened surge cycles during the LIA and tuning by the solar cycle may be why the glacial-geologic record of this particular surge-type glacier provides a surprisingly dependable record of regional climate over the past 600 years.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108969"},"PeriodicalIF":3.2,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418828","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":"A 6000-year high-resolution composite record of El Niño-related drought in subtropical southeast Africa","authors":"Marc Humphries ,&nbsp;Kei Prior ,&nbsp;Andrew Green ,&nbsp;Derrick Vaughn","doi":"10.1016/j.quascirev.2024.108992","DOIUrl":"10.1016/j.quascirev.2024.108992","url":null,"abstract":"<div><div>El Niño–Southern Oscillation (ENSO) extremes have a major impact on global temperature and rainfall patterns, triggering severe droughts and floods in many regions of the world. Paleoclimate records reveal significant changes in ENSO activity at centennial and millennial scales, but uncertainty remains regarding the exact nature of these variations during the Holocene and how they impacted climate patterns across different regions. Here we present a highly resolved sedimentary record from Lake Bhangazi North on the subtropical east coast of South Africa, where modern-day rainfall variability is profoundly influenced by ENSO through teleconnections mediated by the Walker Circulation. Stratigraphic and inorganic geochemical proxies at Lake Bhangazi North provide evidence for significant fluctuations in the local hydrological regime, characterised by extended intervals of aridity. Our findings corroborate independent sedimentary evidence from nearby sites at Lake Muzi and Mkhuze Delta, allowing for the generation of a composite proxy record of drought for the region. This record provides compelling evidence for the occurrence of several major drought events at ∼5100–4200, 3600–2700, 1900–1700 and ∼990 cal yr BP. The timing of these distinctive events exhibits striking correspondence with the ENSO proxy sedimentary record from Laguna Pallcacocha, Ecuador. We propose that El Niño, impacting moisture convergence over the subtropical eastern region of South Africa, was the primary driver of drought in the region over the mid-to-late Holocene. This hypothesis is further supported by stalagmite records from northwest Madagascar that reveal pronounced shifts towards wetter conditions coincident with major drought events in our study area, consistent with the modern rainfall anomaly pattern associated with ENSO. Our findings suggest that major aridity phases observed in records from the east coast of South Africa likely reflect large-scale shifts in regional moisture transport across subtropical southeastern Africa, driven by fluctuations in ENSO conditions.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108992"},"PeriodicalIF":3.2,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418834","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":"From a coastal plain to an anthropized fluvial valley (NW Brittany, France): 7.3 kyr of paleoenvironmental evolution from sedimentological, palynological and paleogenomic perspectives","authors":"Ophélie David ,&nbsp;Muriel Vidal ,&nbsp;Aneta Gorczyńska ,&nbsp;Aurélie Penaud ,&nbsp;Yvan Pailler ,&nbsp;Clément Nicolas ,&nbsp;Evelyne Goubert ,&nbsp;Pierre Stéphan ,&nbsp;Morgane Ollivier ,&nbsp;Frédérique Barloy-Hubler","doi":"10.1016/j.quascirev.2024.108983","DOIUrl":"10.1016/j.quascirev.2024.108983","url":null,"abstract":"<div><div>Over the Holocene (last 11.7 kyr), the Brittany coastal region has undergone major changes in response to rising sea level, climatic fluctuations and increasing anthropogenic influence. This study aims to i) accurately reconstruct the paleoenvironmental evolution of a site located on the north Brittany coast (NW France), a sector that has not been previously investigated thoroughly, and ii) improve the detection of the anthropogenic signature in paleoenvironmental records by using a multidisciplinary approach. To achieve these goals, we made the first cross-correlated study in coastal Brittany region, integrating sedimentological (grain-size, X-ray fluorescence), palynological (pollen grains), and paleogenomic (on plant and mammal sedimentary ancient DNA or sedaDNA) data, which we based two 7.3 kyr-long sedimentary sequences recovered from the Kerallé valley (Plouescat, NW Brittany).</div><div>First, sedimentary and vegetation trajectories allowed us to reconstruct the evolution of past depositional environments in the inner part of the Kerallé valley. The data show a progressive sedimentary infilling of the former alluvial plain, subjected to marine incursion between 7.3 and 6 cal ka BP, up to a continental area, totally disconnected from tidal influence since 5.4 cal ka BP. Second, the analysis of plant and mammal sedaDNA provided a complementary tool to the pollen analysis, enhancing our ability to accurately detect past land-use practices. In the upstream part of the Kerallé system, anthropogenic influence remained scarce until the late Neolithic and seemed to be restricted to the coast, as also indicated by archaeological remains. The first significant human-driven changes in plant community composition likely date back to 4.5 cal ka BP (i.e., late Neolithic), as also shown by the presence of domesticated mammal sedaDNA, both being in agreement with the documented settlement by the first metal-working societies (Bell Beaker culture) in the Plouescat area. From then until 4 cal ka BP (i.e., early Bronze Age), human pressure became more obvious, with the steadily increase in anthropogenic pollen indicators, while sedaDNA of plants and mammals were affected by preservation biases. At 2.7 cal ka BP (i.e., Iron Age), a new anthropic threshold was characterized by maximal forest clearing leading to significant human-induced soil erosion across the Kerallé watershed. Since then, at the local scale of our study, both vegetation dynamics and the presence of domesticated mammals observed by sedaDNA attest to the development of pastoralism.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108983"},"PeriodicalIF":3.2,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418830","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":"Divergent responses of peatland development and carbon accumulation to volcanic eruptions on the Changbai Mountain, Northeast China","authors":"Qiulei Yan ,&nbsp;Zicheng Yu","doi":"10.1016/j.quascirev.2024.108987","DOIUrl":"10.1016/j.quascirev.2024.108987","url":null,"abstract":"<div><div>Peatlands are an important carbon reservoir of terrestrial ecosystems and play a key role in the global carbon cycle. Many peatlands exist in volcanic terrains, but we still lack a systematic understanding of the effects of volcanic ash deposition on peatland development and carbon dynamics. Here we used multi-proxy records from multiple cores at a high-elevation (1570 m a.s.l.) peatland complex on the southern slope of the Changbai Mountain—only 13 km from the crater lake Tianchi—to understand the peatland initiation and carbon accumulation processes under the influence of volcanic eruption. We quantified volcanic glass shards abundance in the peat core under a microscope to show the 5-cm-thick major Millennium Eruption (ME) in 946 CE, along with multiple cryptotephra layers identifiable above a constant background of low abundant shards. Plant macrofossil data show that the major ME volcanic ash deposition caused a large decrease in plant taxon richness, while three out of eight cryptotephra layers induced a brief increase in <em>Sphagnum</em> abundance after each ash deposition but had little impact on plant taxon richness. The divergence in response of species composition to different magnitudes of volcanic ash depositions indicates both beneficial and detrimental effects, perhaps depending on the degree of modifying the nutrient or hydrological status of the peatland. Our results also show that the 5-cm thick ME volcanic ash layer acted as an impermeable layer, increasing surface moisture conditions and promoting the formation of new peatlands on the landscape. Moreover, the ME ash deposition caused a significant decrease in the carbon accumulation rate that lasted for &gt;200 years. Our study indicates that volcanic ash depositions have very different impacts on peatlands by promoting new peatland initiation but impeding carbon accumulation of existing peatlands, implying that the balance of these processes would determine the carbon sink capacity of peatlands in a region as a whole.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108987"},"PeriodicalIF":3.2,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418829","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":"Brine exploitation at Cacica (Romania): An application of radial model of salt supplying","authors":"Marius Alexianu ,&nbsp;Andrei Asăndulesei ,&nbsp;Felix-Adrian Tencariu ,&nbsp;Mihaela Asăndulesei ,&nbsp;Roxana-Gabriela Curcă","doi":"10.1016/j.quascirev.2024.108974","DOIUrl":"10.1016/j.quascirev.2024.108974","url":null,"abstract":"<div><div>Drawing on ethnoarchaeological field research conducted in Romania's Outer Carpathian region between 2007 and 2015, an ethnographic radial model for the supply of brine, recrystallized salt, and rock salt was developed. This paper aims to apply this model to prehistoric contexts, specifically the Neolithic, Chalcolithic, and Bronze Age periods, in relation to the brine sources at Cacica. The selection of this area is grounded in several factors: the presence of multiple brine sources, the use of the <em>briquetage</em> technique (a method for producing salt cakes in ceramic containers) during a specific phase of the Chalcolithic, extensive documentation from ethnographic and ethnohistorical studies, and a rich database on prehistoric settlement patterns.</div><div>At Cacica, two distinct methods of brine exploitation were identified: the production of salt cakes and the direct use of brine without human intervention, primarily for human and animal consumption. The authors utilized the Radial Model of Salt Supply to analyse these two methods of exploitation and suggest that this dual model could offer valuable insights into the understanding of inland <em>briquetage</em> sites across worldwide.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108974"},"PeriodicalIF":3.2,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418826","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":"A substantial meltwater event on the northeastern Tibetan Plateau during the middle to late Holocene transition","authors":"Zheng Wang ,&nbsp;Fan Zhang ,&nbsp;Xiangzhong Li ,&nbsp;Meng Xing ,&nbsp;Yunning Cao ,&nbsp;Huanye Wang ,&nbsp;Jing Hu ,&nbsp;Hongxuan Lu ,&nbsp;Jibao Dong ,&nbsp;Hu Liu ,&nbsp;Zhonghui Liu ,&nbsp;Weiguo Liu","doi":"10.1016/j.quascirev.2024.108996","DOIUrl":"10.1016/j.quascirev.2024.108996","url":null,"abstract":"<div><div>Global warming has accelerated the degradation of permafrost and glaciers on the Tibetan Plateau, resulting in a substantial release of meltwater that is affecting the regional ecosystem. Despite the significant environmental effects of meltwater, there is a lack of comprehensive studies on the historical changes in meltwater. The key is to obtain reliable quantitative records of meltwater changes. Here, we present Holocene δDwax records from a loess and a peatland on the northeastern Tibetan Plateau, documenting the hydrogen isotopic composition of the regional summer precipitation and surface water affected by meltwater respectively. The two records together reveal substantially increased meltwater during the middle to late Holocene transition, lasting for approximately 1500 years. The meltwater event coincides with a series of exceptional warmth during 5-3 ka across the mid-latitude inland Asia, suggesting that the regional warming was the primary driver of the increased meltwater. This meltwater event had a considerable influence on regional ecology, leading to dramatic fluctuations in algal and bacterial populations and biomass. In addition, this meltwater event may have occurred over a larger area of glaciers and permafrost, where the water isotope records during 5 ka and 3 ka differ from low-latitude regions. This meltwater event, as a crucial aspect of the climatic changes during the middle to late Holocene transition in inland Asia, its driving mechanism and environmental impacts warrant further investigation.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108996"},"PeriodicalIF":3.2,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418832","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":"Holocene paleoenvironmental and paleoclimatic variability in a high mountain lake in Sierra Nevada (Spain): Insights from diatom analysis","authors":"Joana Llodrà-Llabrés ,&nbsp;Gonzalo Jiménez-Moreno ,&nbsp;Antonio García-Alix ,&nbsp;R. Scott Anderson ,&nbsp;Francisco J. Jiménez-Espejo ,&nbsp;Charo López-Blanco ,&nbsp;Marta Rodrigo-Gámiz ,&nbsp;Carmen Pérez-Martínez","doi":"10.1016/j.quascirev.2024.108984","DOIUrl":"10.1016/j.quascirev.2024.108984","url":null,"abstract":"<div><div>This study examines the Holocene history of Río Seco Lake (3040 m a.s.l; Sierra Nevada, Southern Spain) by analysing diatom remains and other paleoenvironmental data. The aim is to understand the impact of long-term environmental and climatic variability on the aquatic ecosystem over the past 21,000 years. Our results suggest that shifts in diatom assemblages were mainly climate-driven in terms of temperature and water availability. The absence of diatom remains during the Late Pleistocene indicated low temperatures and prolonged lake snow cover. Five distinct periods were identified during the Holocene. The high abundance of epiphytic and bog-inhabiting taxa and tychoplanktonic <em>Tabellaria flocculosa</em> in the period 11,000–6700 cal yr BP were indicative of a humid climate. The onset of the tychoplanktonic <em>Aulacoseira alpigena</em> between 6700 and 5100 cal yr BP indicated a drop in temperature. These changes intensified during the period 5100–3300 cal yr BP, when the most significant changes in diatom assemblages took place with the dominance of <em>A. alpigena</em> and an abrupt increase in the abundance of the epiphytic <em>Fragilaria radians</em>. During the subsequent period (3300–1500 cal yr BP), the significant declines in <em>A. alpigena</em> and in epiphytic taxa were indicative of increased aridity and higher alkalinity values due to increased aridity and Saharan dust input during this period. The last period (1500–256 cal yr BP) was characterized by a rise in the abundance of <em>Staurosirella pinnata</em>, indicative of warmer temperatures and higher alkalinity values coincident with a marked increase in proxies of temperature and aridity. The increase in aridity and temperature during the last period, which has led to changes in diatom assemblages, is a matter of great concern in an ecosystem that is particularly susceptible to global warming.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108984"},"PeriodicalIF":3.2,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418827","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":"Cosmogenic surface exposure (10Be) dating of raised beaches in Marguerite bay, Antarctic Peninsula: Implications for relative sea-level history","authors":"Cengiz Yıldırım ,&nbsp;Attila Çiner ,&nbsp;Mehmet Akif Sarıkaya ,&nbsp;Alan Hidy","doi":"10.1016/j.quascirev.2024.108995","DOIUrl":"10.1016/j.quascirev.2024.108995","url":null,"abstract":"<div><div>Understanding the dynamics of ice mass loss in polar regions is crucial for deciphering climate change and Glacio Isostatic Adjustment patterns. This study focuses on Marguerite Bay, located in the south-central Antarctic Peninsula. We dated raised beaches to investigate relative sea-level changes using the cosmogenic surface exposure (¹⁰Be) method. Previous studies have provided valuable insights into the region's glacial history, but limitations in dating techniques and age estimates necessitate further investigation. By analysing raised shingle beaches in Gaul Cove of Horseshoe Island and the southern coast of Calmette Bay, this research aims to contribute relative sea-level change history for these areas. In Horseshoe Island's Gaul Cove, raised beaches clustered on prominent steps reveal a 15 m relative sea-level change over the last 3.31 ka. Differently, Calmette Bay exhibits a 36 m relative sea-level fall over the last 7.29 ka. These findings indicate significant and differential glacial-isostatic adjustments in both regions during the middle and late Holocene. Additionally, our data reveal accelerated sea-level fall periods corresponding to Holocene deglaciation and glacial advance events, indicating the shorelines' relative sea-level change sensitivity to climate change.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108995"},"PeriodicalIF":3.2,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418831","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}