Quaternary Science Reviews最新文献

{"title":"Sedimentary response of the Po Basin to Mid-Late Pleistocene glacio-eustatic oscillations","authors":"Luigi Bruno ,&nbsp;Luca Demurtas ,&nbsp;Donatella Magri ,&nbsp;Fabrizio Michelangeli ,&nbsp;Tammy Rittenour ,&nbsp;Wan Hong ,&nbsp;Veronica Rossi ,&nbsp;Stefano Claudio Vaiani ,&nbsp;Amanda Vecchi ,&nbsp;Alessandro Amorosi","doi":"10.1016/j.quascirev.2024.109005","DOIUrl":"10.1016/j.quascirev.2024.109005","url":null,"abstract":"<div><div>The Middle and Late Pleistocene were characterized by high-amplitude climate and sea-level oscillations that deeply influenced the evolution of alluvial and coastal systems worldwide. Through the correlation of 43 cores and 168 well data, with the aid of pollen, meiofauna, ¹⁴C, ESR and IRSL data, this work provides a detailed reconstruction of the Middle Pleistocene to Holocene stratigraphy of the Po Basin and explores the sedimentary response of the Po-Adriatic alluvial-coastal system to glacio-eustatic oscillations and other concomitant forcing factors.</div><div>The Middle Pleistocene to Holocene sedimentary succession of the Po Basin is composed of alluvial, paralic, coastal and shallow-marine facies associations arranged in an overall shallowing-upward trend. This general trend is punctuated by the rhythmical alternation of progradationally stacked coastal wedges with thick alluvial deposits. At landward locations, where the coastal facies wedge out, the depositional cyclicity records alternating paralic and alluvial facies associations. The overall shallowing-upward trend documents the longer-term, progressive filling of the basin driven by high sediment supply which overcame the rate of creation of accommodation induced by subsidence. The cyclic arrangement of facies, paralleled by rhythmical changes in vegetation, reflects Milankovitch-scale, glacio-eustatic oscillations in the 100 ka band. Increasing subsidence towards the sea and the activity of selected sectors of the buried Apennine thrust front, might have enhanced the seaward migration of coastal wedges.</div><div>This study provides clues on the sedimentary response of a low-gradient coastal system to dramatic climatic and eustatic changes. The model of basin evolution presented here may help predict the environmental modifications of coastal areas in near future scenarios of climate and sea-level change.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 109005"},"PeriodicalIF":3.2,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142530653","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":"Seesaw between the westerlies and Asian monsoon regulates vegetation and climate during the last deglaciation in southern Northeast China","authors":"Jian Wang ,&nbsp;Guilin Zhang ,&nbsp;Wenchao Zhang ,&nbsp;Xinying Zhou ,&nbsp;Junchi Liu ,&nbsp;Zeyang Zhu ,&nbsp;Yimin Yang ,&nbsp;Qingjiang Yang ,&nbsp;Keliang Zhao ,&nbsp;Xiaoqiang Li","doi":"10.1016/j.quascirev.2024.109008","DOIUrl":"10.1016/j.quascirev.2024.109008","url":null,"abstract":"<div><div>The history and drivers of hydroclimate changes during the last deglaciation in Northeast China remain contentious. We present a high-resolution record of vegetation and climate changes from Lake Buridun in southern Northeast China (SNEC), spanning the last ∼16 kyr. Multi-proxy reconstruction reveals a slight increase in precipitation prior to the end of Heinrich Stadial 1 (HS1) and forest development during the middle Bølling warming, indicating that hydrothermal conditions regulated regional vegetation. Significant fluctuations in all millennial-scale climatic events underscore the high sensitivity of SNEC to climate change. Our record aligns with high-resolution data from both SNEC and North China, showing a persistent wetting trend during the Bølling-Allerød period. This trend coincides with changes in East Asian summer monsoon intensity and Indo-Pacific warm pool heat content but contrasts with the Greenland temperature records. During the HS1 and Younger Dryas, records show a cold-dry mode in SNEC, contrasting with the cold-wet pattern in central-eastern China caused by the prolonged Meiyu season, which corresponds to the retreat of the monsoon precipitation belt and an enhanced westerly jet. Our data, along with more comprehensive records from broader regions, suggest that hydroclimate in SNEC was dominated by the low-latitude monsoon and the high-latitude westerlies during the warm and cold phases of the last deglaciation, exhibiting a seesaw-like interaction.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 109008"},"PeriodicalIF":3.2,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142530720","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":"Refining the chronology of Middle/Late Pleistocene fossil assemblages in the Argentine Pampas","authors":"Jose Luis Prado ,&nbsp;Mathieu Duval ,&nbsp;Martina Demuro ,&nbsp;Francisco Javier Santos-Arévalo ,&nbsp;María Teresa Alberdi ,&nbsp;Rodrigo L. Tomassini ,&nbsp;Claudia I. Montalvo ,&nbsp;Ricardo Bonini ,&nbsp;Cristian M. Favier-Dubois ,&nbsp;Sallie Burrough ,&nbsp;Szilvia Bajkan ,&nbsp;Germán M. Gasparini ,&nbsp;Jonathan Bellinzoni ,&nbsp;Fernando J. Fernández ,&nbsp;Sara García-Morato ,&nbsp;María Dolores Marin-Monfort ,&nbsp;Shaun Adams ,&nbsp;Jian-xin Zhao ,&nbsp;Elisa Beilinson ,&nbsp;Yolanda Fernández-Jalvo","doi":"10.1016/j.quascirev.2024.108958","DOIUrl":"10.1016/j.quascirev.2024.108958","url":null,"abstract":"<div><div>Middle and Late Pleistocene large and mega-mammal records of the Argentine Pampas, belonging to the Bonaerian and Lujanian Stages/Ages, have not yet been adequately dated by standard numerical radiometric methods. Reference timescales for Argentina and other South American fossil sites are mainly based on the mammalian faunal content (biostratigraphic units or biozones). We have recently dated three Middle and Late Pleistocene faunal sites located in the Buenos Aires Province using Electron Spin Resonance (ESR), U-series, Optically Stimulated Luminescence (OSL) and radiocarbon dating. The geographically distant sites (Salto de Piedra, Campo Spósito and Cascada de Paleolama) have yielded fossil assemblages representative of the Lujanian and Bonaerian Stages/Ages. Salto de Piedra, systematically excavated, records one of the most complete fossil sequences and our results indicate that it deposited between at least 127.4 ka (minimum age; Late Pleistocene, MIS 5) and 4.8–4.3 cal ka BP (Middle Holocene, MIS 1). Campo Spósito lower level (corresponding to ‘El Tala’ unit) was dated to &gt;188 ka via ESR/U-series dating of teeth. Finally, Cascada de Paleolama Unit D, towards the base of the sequence, produced an age of 143 ± 20 ka (Late Pleistocene, MIS 5/6). The new dating results provide a crucial additional age control for the Bonaerian and Lujanian Stages/Ages, and allowed us to better identify and calibrate the limits of <em>Equus neogeus, Megatherium americanum</em> biozones, as well as to better constrain other index taxa that are used to construct local biostratigraphical frameworks. Our results indicate the need for a revision of the biozone schemes established for the Quaternary of Pampean region.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108958"},"PeriodicalIF":3.2,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446988","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":"Corrigendum to ‘Late Pleistocene to Holocene alluvial deposits of the Inaouène Valley and their paleoenvironmental significance (north Morocco)’ [Quat. Sci. Rev. 344 (2024) 108941]","authors":"Mohammed Lghamour ,&nbsp;Lhoucine Karrat ,&nbsp;Vincenzo Picotti ,&nbsp;Irka Hajdas ,&nbsp;Negar Haghipour ,&nbsp;Giulia Guidobaldi ,&nbsp;Karin Wyss Heeb ,&nbsp;Lahcen Gourari","doi":"10.1016/j.quascirev.2024.109007","DOIUrl":"10.1016/j.quascirev.2024.109007","url":null,"abstract":"","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 109007"},"PeriodicalIF":3.2,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446909","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":"Earliest direct evidence of horse husbandry and essential social network for sacrificial rituals during the Western Zhou Dynasty in China","authors":"Huiping Cai ,&nbsp;Qiang Ma ,&nbsp;Mengling Gao ,&nbsp;Yaowu Hu","doi":"10.1016/j.quascirev.2024.108997","DOIUrl":"10.1016/j.quascirev.2024.108997","url":null,"abstract":"<div><div>Horses were initially managed and domesticated in Central Asia during the Neolithic period for their utilization as a source of sustenance and transportation. Subsequently, they came to symbolize the elevated status of individuals when interred alongside elites in nomadic cultures during the Bronze Age in the eastern Eurasian Steppe. This practice was also adopted in China and became an indispensable component of Zhou rituals, with its origins dating back to the Late Shang Dynasty and subsequently spreading throughout the Western Zhou Dynasty. The understanding of horse management for sacrificial purposes after its introduction to China remains limited. In this study, we present isotopic data (<em>δ</em>¹³C, <em>δ</em>¹⁵N, <em>δ</em>³⁴S, <em>δ</em>¹⁸O) and ¹⁴C-dating results obtained from equine bones discovered at the Yaoheyuan site in Ningxia, China, which served as a vassal state attached to Western Zhou. The dating analysis reveals that horses lived during the period of 1203 BC∼821 BC (2σ, 95.4%), within the chorological range of the early to middle Western Zhou Dynasty generally. The multi-isotope analysis demonstrates that sacrificial horses exhibited diverse dietary patterns and originated from various regions, highlighting how burial owners held dominant authority over valuable equine resources. Similar patterns of horse management can be observed across other sites in China during both the Bronze Age and Iron Age periods as well as within the eastern Eurasian Steppe region. This suggests that horse sacrificial ritual originated from this steppe region but became localized within Chinese culture upon its introduction to China and eventually turned into an intrinsic characteristic of Zhou ritual practices. Sustaining such widespread adoption of this ritual throughout Western Zhou period required a continuous social network, including a self-sustained system to raise horse locally and an imported system to obtain horses in the steppe by wars, tributes, or trade exchange. Our study offers the earliest direct evidence of the ceremonial handling of equine sacrifices and the crucial social network during the Western Zhou Dynasty, enhancing our comprehension of cultural exchange between the eastern Eurasian Steppe and China.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108997"},"PeriodicalIF":3.2,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446987","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":"Imprints of Atlantic Multidecadal Oscillation on pantropical seawater pH inferred from coral δ11B records","authors":"Huiling Kang ,&nbsp;Xuefei Chen ,&nbsp;Wenfeng Deng ,&nbsp;Tianyu Chen ,&nbsp;Guanqiang Cai ,&nbsp;Gangjian Wei","doi":"10.1016/j.quascirev.2024.109003","DOIUrl":"10.1016/j.quascirev.2024.109003","url":null,"abstract":"<div><div>Understanding natural variability in seawater pH (pH_sw) is crucial for predicting future ocean acidification. Coral boron isotopes (δ¹¹B) offer an alternative method to extend pH_sw records back centuries, shedding light on how pH_sw varies over time. This study compiles both new and existing coral δ¹¹B records from pantropical oceans to investigate multidecadal pH_sw variability and its connection to climate variability. A notable finding is the pronounced influence of the Atlantic Multidecadal Oscillation (AMO) on pantropical coral δ¹¹B-pH variations. This is primarily interpreted as the effects of AMO-associated climate changes on reef pH_sw, rather than influencing coral physiological processes related to calcifying fluid pH. Key factors like wind speeds and hydrological variability related to Intertropical Convergence Zone (ITCZ) shifts are identified as potential drivers of the AMO's impact on pH_sw. This study thus provides valuable insights into the broader effects of the Atlantic climate on pantropical seawater CO₂ system.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 109003"},"PeriodicalIF":3.2,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446906","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":"Precipitation variability and environmental change across late Quaternary glacial-interglacial cycles in lowland Central America: Insights from Lake Petén Itzá (Guatemala) sediments","authors":"Rodrigo Martínez-Abarca ,&nbsp;Liseth Pérez ,&nbsp;Thorsten Bauersachs ,&nbsp;Frederik Schenk ,&nbsp;Steffen Kutterolf ,&nbsp;Mark Brenner ,&nbsp;Thomas Guilderson ,&nbsp;Alex Correa-Metrio ,&nbsp;Flavio S. Anselmetti ,&nbsp;Robert Brown ,&nbsp;Daniel Ariztegui ,&nbsp;Laura Macario-González ,&nbsp;Esmeralda Cruz-Silva ,&nbsp;Juan Carlos Beltran-Martinez ,&nbsp;Mark Bush ,&nbsp;Mona Stockhecke ,&nbsp;Jason Curtis ,&nbsp;Antje Schwalb","doi":"10.1016/j.quascirev.2024.108985","DOIUrl":"10.1016/j.quascirev.2024.108985","url":null,"abstract":"<div><div>Lowland Central America, a biodiversity hotspot in the northern Neotropics, is a region where the climate is influenced by the location and expansion-contraction of the Intertropical Convergence Zone (ITCZ) on seasonal to millennial timescales. Paleo-records from the Caribbean Sea and the eastern equatorial and subtropical Pacific Ocean illustrate the response of regional precipitation to fluctuations in global temperature, driven by glacial-interglacial cyclicity over the past 500 kyr. Here, we present a paleoclimate and paleoenvironment record from Lake Petén Itzá, lowland Guatemala, which spans the last ∼413 kyr. Sediment in the lake recorded lacustrine and terrestrial ecosystem responses to large-scale climate variability. Precipitation patterns during MIS11-9 (∼413-304 ka BP) align with the latitudinal position of the ITCZ, with superimposed effects from the strength of the Caribbean Low-Level Jet (CLLJ). A sediment hiatus, likely attributable to mass removal processes in the lake's shallower areas, spans the period from MIS8 (starting at 304 ka BP) to the end of MIS6 (at 149 ka BP). MIS6 was characterized by humid conditions, perhaps ascribable to a more southerly extension of cold fronts and intensification of the CLLJ. During MIS5, pronounced fluctuations among all sediment variables, accompanied by an abrupt decline in precipitation, may correspond with cold events inferred from North Atlantic Ocean sediment cores. Although discontinuous, the Lake Petén Itzá sediment record provides a window into late Quaternary climate and environmental change in lowland Central America.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108985"},"PeriodicalIF":3.2,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446989","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":"Sediment recycling during the Holocene marine transgression in Ría de Vigo (NW Iberia): multiproxy evidence and environmental implications","authors":"C. Muñoz Sobrino ,&nbsp;A. Castro-Parada ,&nbsp;V. Cartelle ,&nbsp;N. Martínez-Carreño ,&nbsp;C. Delgado ,&nbsp;N. Cazás ,&nbsp;I. Lázaro ,&nbsp;S. García-Gil","doi":"10.1016/j.quascirev.2024.109006","DOIUrl":"10.1016/j.quascirev.2024.109006","url":null,"abstract":"&lt;div&gt;&lt;div&gt;A new multiproxy study of a 155-cm sediment core located in Ría de Vigo (NW Iberia) recording the transgressive and highstand system tract of the Holocene sea-level rise is presented. New data described include grain size, geochemical analyses, high-resolution qualitative/quantitative analyses of pollen, non-pollen palynomorphs and dinoflagellate cysts content, the qualitative evaluation of diatoms at different key levels and the reconsideration of some seismic interpretations. Besides, 14 radiocarbon dates were obtained from shells and pollen extracts. This new evidence revealed that notable changes in the sedimentation rates and the relative abundance of the different types of palynomorphs occurred during the Holocene. The sediment core studied shows anomalous pollen successions, including unexpected &lt;em&gt;Pinus&lt;/em&gt; pollen peaks, during the Early and Middle-Holocene. Differential dating revealed that those anomalous successions correspond to conspicuously aged sediment that has inverted pollen chronologies. Thus, these facies may constitute evidence of redeposition of ancient upland sediments, formed above the ancient coastline at different intervals comprised between the end of the Last Glacial Maximum and the early stages of the Lateglacial, which were rich in very resistant pollen types (&lt;em&gt;Pinus&lt;/em&gt;). Dinoflagellate cyst records in combination with the non-reworked pollen evidence reveal a reliable climatic seesaw during the Holocene, includingwet stormy periods of prevailing mixed waters, with strong development of &lt;em&gt;Lingulodinium&lt;/em&gt; and high accumulation rates in dinoflagellate cysts, which alternate with other sparsely stormy and drier phases, characterised by the coastal upwelling intensification, well-stratified waters, and increases in &lt;em&gt;Bitectatodinium&lt;/em&gt; and &lt;em&gt;Spiniferites&lt;/em&gt; spp. but low accumulation rates in dinoflagellate cysts. These climatic dynamics, including a millennial drier cool period that occurred just after the Thermal Optimum are consistent with previous evidence obtained in other limnetic systems in the Iberian Peninsula. Furthermore, there is a delay between the two phases with the highest marine contribution to sediment (ca. 11.0-8.2 and ca. 4.0–3.0 cal ka BP) and the subsequent warm stages when the relative sea level stabilises: the Thermal Optimum (8.0–6.0 ka BP) and the 2.5-0.5 ka BP interval, respectively. Changes in &lt;em&gt;Pinus&lt;/em&gt; pollen concentrations and grain size recorded in the postglacial sediments suggest that some upland ancient (Lateglacial) pollen evidence might be remobilised, especially during stages of upwelling intensification, and then resedimented in the seabed. Further studies will be needed to determine if the significant differences existing between the &lt;em&gt;Pinus&lt;/em&gt; pollen grain sizes respond to climatic variations affecting the region or have been the result of any replacement of pine species in the area. Nonetheless, &lt;em&gt;Pinus&lt;/em&gt; pollen evidence almost disappeare","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 109006"},"PeriodicalIF":3.2,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446908","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":"Hydroclimate modulation of central-eastern Mexico by the North Atlantic subtropical high since the little ice age","authors":"Patricia Piacsek ,&nbsp;Juan Pablo Bernal ,&nbsp;María del Pilar Aliaga-Campuzano ,&nbsp;Luis Bernardo Chavero ,&nbsp;Fernanda Lases-Hernández ,&nbsp;Francisco William da Cruz ,&nbsp;Nicolás Misailidis Strikís ,&nbsp;Liliana Corona-Martinez ,&nbsp;Veronica M. Ramirez ,&nbsp;Marília Harumi Shimizu ,&nbsp;Herminio Rojas","doi":"10.1016/j.quascirev.2024.108981","DOIUrl":"10.1016/j.quascirev.2024.108981","url":null,"abstract":"<div><div>We reconstructed the hydroclimate of central-eastern Mexico over the last 700 common era (CE) based on inferences from multi-proxies from a stalagmite (K-Inc) collected at Karmidas cave, eastern México. Projections on hydroclimate variability in Mexico raise concerns about possible future occurrences of severe droughts and seasonal water balance fluctuations related to increased global temperatures caused by anthropogenic climate change (Murray-Tortarolo, 2021). The eastern region influences the production and supply of food to Mexico. Simulations of past climates, validated by paleoclimate records, yield valuable perspectives on climate change and enhance our understanding of future projections. However, the paucity of paleoclimatic records hinders understanding past hydroclimatic variations and their climatic mechanisms in eastern Mexico. Our record covers the Little Ice Age (LIA) through the Historical Interval (HI), a crucial period for understanding the climate repercussions spanning the transition from Earth's climatic history to the post-industrial era. The reduced intensity of the North Atlantic Subtropical High (NASH) during the LIA enabled a prominent negative phase of NAO-like variability from 1600 CE until the end of LIA. Consequently, preferent meridional airflow within the continent fosters the encounter of moisture-laden intrusions with the increased frequency of cold surges as the occurrence of frontal rain in eastern Mexico, impairing the amount effect on the K-Inc δ¹⁸O record. However, after the artificial opening of the cave in 1910 CE, the δ¹⁸O records of K-Inc began to exhibit a ∼20-year oscillatory periodicity. In this context, the trace elements of K-Inc help elucidate the climatic conditions that governed the precipitation regime during the investigated period. The visual alignment between the zonal sea surface temperature (SST) variability in the eastern equatorial Pacific (EEP) and the trace elements (Sr/Ca and Ba/Ca) of K-Inc reveals their relationship. Warm zonal SST in the EEP appears to be associated with changes in the length of the winter and summer seasons in eastern Mexico during the LIA. In contrast, over the HI, the trace elements of K-Inc show an anti-phase response to Warm zonal SST in the EEP, denoting wetter climate conditions at the vicinities of Karmidas Cave. This configuration led to questioning the influence of SST zonal variability in the EEP during the HI, which was probably masked by more relevant climate forcing. Our findings enabled us to draw climate scenarios by addressing the main climate drivers in our records.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108981"},"PeriodicalIF":3.2,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142440899","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":"Beryllium ten production and relative paleointensity for the past 1.2 million years","authors":"Jean-Pierre Valet ,&nbsp;Tatiana Savranskaia ,&nbsp;Ramon Egli ,&nbsp;Quentin Simon ,&nbsp;Franck Bassinot ,&nbsp;Nicolas Thouveny","doi":"10.1016/j.quascirev.2024.108993","DOIUrl":"10.1016/j.quascirev.2024.108993","url":null,"abstract":"<div><div>Composite curves of relative paleointensity document the evolution of the geomagnetic field intensity during the past 1.2 Million years. Several records of production of ¹⁰Be cosmogenic isotope from the ¹⁰Be/⁹Be ratio (referred to as Be-ratio) covering this period have also been acquired. We add here new ¹⁰Be records to the database and produce a first composite curve of beryllium production (Be-1200) for the past 1.2 Myr. We compare Be-1200 with Sint-2000 (Valet et al., 2005) and PISO-1500 (Channell et al., 2009) paleointensity curves. The three curves show similar patterns, but frequently different amplitudes. The variations in dipole moment values derived from the Sint-2000 and PISO-1500 relative paleointensity composite curves were then confronted with the geomagnetic dipole moment record derived from the Be-1200 record. The predicted amplitudes of dipole moment loss during geomagnetic excursions reconstructed from the measured in the Be-1200 record are generally compatible with those deduced from SINT-2000 and PISO-1500. More specifically, the three datasets indicate very low field intensities during the Laschamp, that are consistent with the existence of reverse directions, and to a lesser extent during other events (Iceland basin, Calabrian Ridge/West Eifel events). The two paleointensity curves show a decrease in field intensity of at least 80–90% during the reversals. The Be- derived dipole moment decreases meet the predictions for the Brunhes/Matuyama transition, but are significantly smaller than expected for the two Jaramillo transitions. Such limited variability may result from the impact of environmental factors on the Be ratios, as suggested in a previous study of the last reversal (Savranskaia et al., 2021). This comparative study of ¹⁰Be records and relative paleointensity records reveals that, in particular cases, Be ratio records can underestimate the amplitude of virtual geomagnetic dipole variation. With their respective strengths and weakness, these two approaches provide similar first-order patterns relevant to the common control by the geomagnetic moment variation.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108993"},"PeriodicalIF":3.2,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142440900","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}