Quaternary Science Reviews最新文献_第10页

Stable isotope dendroclimatology in Southern African Savannas 南部非洲稀树草原的稳定同位素树木气候学

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2026-02-01 Epub Date: 2025-12-05 DOI: 10.1016/j.quascirev.2025.109730

M.E. Niemand , S.M. Woodborne , F.H. Neumann

Classical dendrochronology uses annually formed anatomical proxies such as tree-ring width to reconstruct environmental conditions. The scarcity of classical tree-ring studies coincides with the distribution of the Southern African Savannas, where tree adaptations limit its application. Savanna trees exhibit adaptive strategies to survive fire, herbivory, and frequent multi-season droughts that lead to indistinct growth-rings that are potentially not annually formed and therefore unsuitable as age or environmental proxies in palaeoclimate reconstructions. With some caveats, these shortcomings can be overcome. Stable isotope ratios, such as δ¹³C in radial growth increments, can serve as a proxy for environmental conditions in trees lacking annual rings. We present a 3-step framework for generating isotope dendroclimatology from such trees: (1) radiocarbon dating as an age indicator, (2) stable isotope ratios as an environmental proxy, and (3) instrumental climate data comparisons to test the environmental sensitivity of the isotope chronology. In a multi-tree chronology, the age models are key. The radiocarbon chronology acts as an initial constraint for the δ¹³C record for individual trees and using a parsimonious approach that presumes a common environmental signal between trees, each δ¹³C chronology becomes an a priory input into refining the individual age models within limits set by the radiocarbon precision to yield the master chronology. Establishing the sensitivity of δ¹³C proxy records to climate forcing adheres to the same requirements as classical dendrochronology. Although annual resolution is unattainable, reconstructions elucidating decadal to centennial-scale trends in regions with few long-lived trees nevertheless contribute to long-term climate trends.

经典的树木年代学使用每年形成的解剖学指标，如树木年轮宽度来重建环境条件。经典的树木年轮研究的缺乏与南部非洲稀树草原的分布一致，在那里树木的适应限制了它的应用。稀树草原树木表现出适应火灾、草食和频繁的多季干旱的策略，导致生长年轮不明显，可能不是每年形成的，因此不适合作为古气候重建的年龄或环境指标。尽管有一些注意事项，但这些缺点是可以克服的。径向生长增量δ13C等稳定同位素比值可以作为缺乏年轮的树木环境条件的代表。我们提出了从这些树木中生成同位素树木气候学的三步框架：(1)放射性碳定年作为年龄指标，(2)稳定同位素比率作为环境代理，(3)仪器气候数据比较以测试同位素年代学的环境敏感性。在多树年表中，年龄模型是关键。放射性碳年代学作为单个树木δ13C记录的初始约束，使用假设树木之间存在共同环境信号的简约方法，每个δ13C年代学成为在放射性碳精度设定的范围内精炼单个年龄模型的优先输入，从而产生主年代学。建立δ13C代用记录对气候强迫的敏感性符合经典树木年代学的要求。尽管年际分辨率无法实现，但在年际到百年尺度的树木很少的地区，重建结果阐明了年代际到百年尺度的趋势，但有助于长期气候趋势。

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引用次数: 0

Quaternary terrace formation in response to climate, regional uplift and local normal faulting: The Danube terrace staircase of Vienna 气候、区域隆起和局部正断层作用下的第四纪阶地形成：维也纳多瑙河阶地阶梯

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2026-02-01 Epub Date: 2025-12-15 DOI: 10.1016/j.quascirev.2025.109709

B.C. Salcher , S.M. Neuhuber , J.-C. Otto , T. Payer , C. Lüthgens , S. Fuchs , A. Flores-Orozco , J. Nørgaard , S. Grupe , O. Marchhart , A. Wieser , J. Lachner , M. Fiebig , Zs. Ruszkiczay-Rüdiger

Quaternary terrace sequences can be observed along many mid to high latitudinal rivers, often reflecting a distinct, climate-related cyclicity of the fluvial system in uplifting regions. They are also essential landforms in many continental basins even though local basin subsidence may counteract an existing regional uplift trend. Glacial and periglacial processes may amplify events of river aggradation, with associated terraces providing clear stratigraphic markers. In this study, we explore the opposing lithospheric forces, regional uplift vs. local normal faulting, along a perialpine section of the Danube River, which is strongly affected by a 100-ka depositional cyclicity during the Quaternary. Within the city of Vienna, the Danube formed an extensive terrace staircase across a continental-scale normal fault. This fault demarcates the transition of the Eastern Alps and the Miocene Vienna Basin. Its Quaternary activity remained ambiguous and its impact on terrace configuration largely unexplored. Solifluction processes over several glacial-interglacial cycles typically led to thick colluvial deposits along terrace slopes, resulting, together with the anthropogenic overprint, in obliteration of the terrace morphology. To constrain terrace geometry, elevation and decipher fault kinematics we used electrical resistivity tomography, drill log and historical outcrop data. We applied morphostratigraphic age modelling supported by terrestrial cosmogenic radionuclide burial and luminescence dating to derive rates of uplift and subsidence. Results show how long-wavelength uplift and concomitant normal faulting have controlled terrace development and Quaternary landscape evolution. This study provides clear evidence for fault activity within the city of Vienna.

在许多中高纬度河流沿线可以观察到第四纪阶地序列，通常反映了隆升地区河流系统的独特的、与气候相关的周期性。它们也是许多大陆盆地必不可少的地貌，尽管局部盆地沉降可能抵消现有的区域隆起趋势。冰川和冰缘作用可以放大河流的淤积事件，相关的阶地提供了明确的地层标志。在本研究中，我们探讨了受第四纪100 ka沉积旋回活动强烈影响的多瑙河近高山段区域隆升与局部正断层的相反岩石圈力。在维也纳市内，多瑙河形成了一个横跨大陆规模的正断层的巨大阶梯式楼梯。该断层是东阿尔卑斯山脉和中新世维也纳盆地的分界线。其第四纪活动尚不明确，对阶地结构的影响也未得到充分研究。几个冰期-间冰期旋回的溶蚀作用通常导致沿阶地斜坡形成厚厚的崩积沉积物，再加上人为叠印，导致阶地形态的湮没。为了约束阶地的几何形状、高程和破译断层运动学，我们使用了电阻率层析成像、钻井测井和历史露头数据。我们应用陆生宇宙成因放射性核素埋藏和发光测年支持的地貌地层年龄模型来计算隆起和沉降速率。结果表明，长波隆升及其伴生的正断层作用控制了阶地发育和第四纪景观演化。这项研究为维也纳市内的断层活动提供了明确的证据。

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引用次数: 0

New U-series and coupled ESR/U-series dating of Xujiayao (northern China), the type site for Homo juluensis 中国北方许家窑智人（Homo juluensis）类型遗址的新U-series和耦合ESR/U-series定年

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2026-02-01 Epub Date: 2025-12-10 DOI: 10.1016/j.quascirev.2025.109742

Qingfeng Shao , Fagang Wang , Junyi Ge , Jean-Jacques Bahain , Pierre Voinchet , Guilan Hu , Xinrui Jin , Rainer Grün , Christopher J. Bae , Xing Song

The Xujiayao site, located in the western part of the Nihewan Basin, Hebei Province, northern China, has yielded 21 pieces of archaic hominin fossils in association with numerous stone artifacts and mammalian remains. The Xujiayao hominin remains were recently used to define a new species Homo juluensis, representing a series of fossils, such as the Xuchang, Xiahe, Penghu, Tam Ngu Hao 2, and Denisova remains. Different dating methods have been used to estimate the age of the Xujiayao hominin remains since the 1970s when the site was originally discovered. Unfortunately, the proposed ages vary in a wide range, from the middle Middle Pleistocene to the late Late Pleistocene. To refine the age of this site, we present a new dating study using both U-series and coupled ESR/U-series dating methods. Direct U-series dating on five of the Xujiayao hominin fossils provided minimum ages ranging from ∼100 to 200 ka, which are further confined by the Diffusion – Adsorption – Decay (DAD) model ages of 172 ± 3 ka and 195 ± 5 ka, and the coupled ESR/U-series ages ranging from 144 ± 10 to 211 ± 12 ka, obtained on the associated faunal remains. These new dates were integrated with some of previously published dating results by a Bayesian age model, demonstrating that the Xujiayao upper cultural layer, in which were recovered the hominin fossils, can be constrained between 138 ± 10 ka and 199 ± 8 ka, and the lower cultural layer between 205 ± 8 ka to 228 ± 17 ka, placing the hominin occupation in a period covering the marine isotope stages 7 and 6.

徐家窑遗址位于中国北部河北省泥河湾盆地西部，在这里发现了21块古人类化石，以及大量的石器和哺乳动物遗骸。许家窑古人类遗骨最近被用来定义一个新的物种——朱立人，它代表了许昌、夏河、澎湖、潭牛号2号和丹尼索瓦遗骨等一系列化石。自20世纪70年代徐家窑古人类遗址被发现以来，人们使用了不同的年代测定方法来估计该遗址的年龄。不幸的是，提出的年龄范围很广，从中更新世中期到晚更新世晚期。为了确定该遗址的年龄，我们提出了一项新的测年研究，使用u -系列和耦合ESR/ u -系列测年方法。对5具须家窑古人类化石进行直接u系列测年，得到的最小年龄在~ 100 ~ 200 ka之间，进一步受到扩散-吸附-衰变（DAD）模式年龄（172±3 ka和195±5 ka）的限制，以及相关动物遗骸的耦合ESR/ u系列年龄（144±10 ~ 211±12 ka）的限制。利用贝叶斯年龄模型，将这些新的年代与先前发表的部分定年结果相结合，表明许家窑上层文化层（其中发现了古人类化石）的时间限制在138±10 ka至199±8 ka之间，下层文化层（205±8 ka至228±17 ka）之间，将古人类的活动置于海洋同位素阶段7和6的时期。

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引用次数: 0

Hydroclimate forcing and anthropogenic impacts trigger an early (∼1650 cal yr BP) regime shift in Chenghai Lake (China) 水文气候强迫和人为影响引发澄海早期（~ 1650 calyr BP）气候变化

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2026-01-01 Epub Date: 2025-11-29 DOI: 10.1016/j.quascirev.2025.109726

Qian Wang , John P. Smol , Kathleen M. Rühland , Rong Wang , Xiangdong Yang , Enlou Zhang , Yanjie Zhao , Yanling Li

Regime shifts in lake ecosystems are critical responses to cumulative environmental stress, yet the roles of climate variability and human activities in driving these transitions remain unclear, particularly in regions with long-term human-environment interactions. Here we reconstruct ∼8000 years of ecological dynamics in Chenghai Lake, a closed-basin lake in Southwest China, using cladoceran assemblages, sedimentary chlorophyll a, and geochemical records. We identify a major regime shift at ca. 1650 cal yr BP, characterized by a species turnover from planktonic to littoral and macrophyte-associated cladoceran communities, accompanied by declining primary productivity and increasing turbidity. This ecosystem shift was driven by progressive evaporation, monsoon weakening, and intensified catchment disturbance from deforestation and agriculture that collectively led to severe hydrological stress. Indicators of resilience (autocorrelation at lag-1 (AR1) and variance) suggest a gradual loss of system stability preceding the shift. Our findings suggest that coupled climate-vegetation-hydrology pressures can progressively destabilize lake ecosystems, promoting abrupt and persistent ecological transitions.

湖泊生态系统的状态变化是对累积环境压力的关键响应，但气候变率和人类活动在推动这些变化中的作用尚不清楚，特别是在人类与环境长期相互作用的地区。本文利用支海组合、沉积叶绿素a和地球化学记录重建了中国西南部澄海—8000年来的生态动态。在大约1650 calyr BP，我们发现了一个主要的制度转变，其特征是从浮游生物到滨海和大型植物相关的枝海群落的物种更替，伴随着初级生产力的下降和浊度的增加。这种生态系统转变是由逐渐蒸发、季风减弱以及森林砍伐和农业造成的集水区干扰加剧所驱动的，这些因素共同导致了严重的水文压力。弹性指标（lag-1 （AR1）和方差的自相关）表明，在转变之前，系统稳定性逐渐丧失。我们的研究结果表明，气候-植被-水文耦合压力会逐渐破坏湖泊生态系统的稳定，促进突然和持续的生态转变。

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引用次数: 0

Beyond the cold steppes: Neanderthal landscapes and the neglect of flora 在寒冷的草原之外：尼安德特人的景观和对植物的忽视

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2026-01-01 Epub Date: 2025-11-14 DOI: 10.1016/j.quascirev.2025.109673

José Carrión , Gabriela Amorós , Ariadna Amorós , Ana B. Marín-Arroyo

Understanding the environmental contexts in which Neanderthals lived is essential for interpreting their behavioral adaptations, resource use, and ecological strategies. These landscapes shaped the availability of plant and animal resources, influencing patterns of mobility, technology, and survival. This article presents an integrative reconstruction of Neanderthal landscapes across the full extent of their Eurasian distribution, combining palaeoecological synthesis, archaeobotanical records, and scientifically grounded palaeoart applied to Iberian case studies with particular emphasis on plant species—traditionally marginalized in a predominantly zoocentric paleoartistic tradition. Building on a sustained review articulated through a series of landscape “chronicles,” the study contextualizes palaeovegetation mosaics across stadial and interstadial phases during the Middle and Late Pleistocene. By examining the interplay between vegetation dynamics, climatic oscillations, and human presence, we explore the spatial heterogeneity of Neanderthal environments, the persistence of forest elements in southern glacial refugia, the existence of migratory corridors and coastal platforms, and the shifting expression of the Mediterranean biome under Quaternary rhythms. The palaeoartistic reconstructions are firmly rooted in palaeobotanical evidence and serve as heuristic devices for generating hypotheses about Neanderthal habitat structure, ecological plasticity, and niche breadth. These visualizations move beyond mere illustration to render palaeobiogeographic complexity and to support a broader discussion of Neanderthal eco-evolutionary interactions, including resource use, refugial continuity, and interspecific contact. Importantly, this work seeks to challenge the entrenched popular view that Neanderthals must be associated exclusively with treeless, open glacial landscapes, instead highlighting the diversity of vegetated environments in which they lived.

了解尼安德特人生活的环境背景对于解释他们的行为适应、资源利用和生态策略至关重要。这些景观塑造了植物和动物资源的可用性，影响了流动、技术和生存的模式。这篇文章展示了尼安德特人在欧亚分布范围内的景观的综合重建，结合了古生态综合、考古植物学记录和应用于伊比利亚案例研究的有科学依据的古艺术，特别强调了植物物种——传统上在以动物为中心的古艺术传统中被边缘化。在通过一系列景观“编年史”进行持续回顾的基础上，该研究将更新世中晚更新世不同时期和不同时期的古植被马赛克置于不同的背景下。通过考察植被动态、气候振荡和人类活动之间的相互作用，我们探索了尼安德特人环境的空间异质性、南部冰川避难所森林元素的持久性、迁徙走廊和海岸平台的存在，以及第四纪节律下地中海生物群系的变化表达。古艺术重建牢固地植根于古植物学证据，并作为启发式工具，为尼安德特人栖息地结构、生态可塑性和生态位宽度产生假设。这些可视化图像超越了单纯的图解，呈现了古地理的复杂性，并支持了对尼安德特人生态进化相互作用的更广泛讨论，包括资源利用、避难连续性和种间接触。重要的是，这项工作试图挑战根深蒂固的流行观点，即尼安德特人必须只与没有树木的开放冰川景观联系在一起，而不是强调他们生活的植被环境的多样性。

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引用次数: 0

Post-LGM sedimentation history and deglaciation processes in the southern Gulf of St. Lawrence, Canada 加拿大圣劳伦斯湾南部后lgm沉积史及消冰过程

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2026-01-01 Epub Date: 2025-11-25 DOI: 10.1016/j.quascirev.2025.109715

I. Schulten , V. Maselli , E.L. King , M. Schmidt , C. Hensen , T. Müller , A. Asioli , A. Micallef , C. Berndt , C.J. Brown , F. Córdoba-Ramírez , J. Elger , S. Hölz , A. Kotliarov , B. Kurylyk , S. Yu , M.R. Nedimović

During the last glacial period, continents and surrounding shelves in high latitude regions of the Northern Hemisphere were covered by ice sheets. Their retreat after the Last Glacial Maximum resulted in isostatic adjustments of the previously glaciated landmass and post-glacial changes in relative sea level during the late Pleistocene and Holocene. Many questions, however, remain about the timing and impact of the ice retreat and of short-lived climatic events on continental shelf environments. This study aims to reconstruct the sedimentation and deglaciation processes on the continental shelf of the southern Gulf of St. Lawrence (Canada) over the past 14 ka by investigating changes in the sedimentation patterns and paleo-environments. Using information from sub-bottom profiles, sediment cores, and multibeam bathymetry, this study finds that most of the continental shelf was flooded 13.6 ka ago, as evidenced by the presence of Bølling-Allerød marine sediments at a water depth of ∼50 m and ∼15 km off the modern coastline, which also suggests an earlier retreat of the Laurentide Ice Sheet than suggested by previous studies. We estimate sedimentation rates for the Bølling-Allerød of ∼0.4 cm a⁻¹, which increased up to 1 cm a⁻¹ during the Younger Dryas cooling event, likely associated with increased storm-wave activity and sea ice development caused by deteriorating climatic conditions. The presence of an erosional truncation atop Younger Dryas sediments indicates a late Pleistocene-early Holocene relative sea level fall and associated lowstand. Based on our new data, we established a geological model that highlights sedimentation processes since the Last Glacial Maximum and demonstrate the potential impact of short-lived climatic events on the former ice margin during deglaciation.

在末次冰期，北半球高纬度地区的大陆及其周围的冰架被冰原覆盖。它们在末次盛冰期后的退缩导致了前冰川陆块的均衡调整和晚更新世和全新世冰川后相对海平面的变化。然而，关于冰退缩的时间和影响以及短期气候事件对大陆架环境的影响，仍然存在许多问题。本研究旨在通过研究圣劳伦斯湾南部大陆架沉积模式和古环境的变化，重建过去14ka来的沉积和消冰过程。利用来自海底剖面、沉积物岩心和多波束测深的信息，本研究发现，13.6 ka前，大部分大陆架被淹没，在距现代海岸线约50米和约15公里的水深处存在b ølling- allerd海洋沉积物，这也表明劳伦泰德冰盖的退缩比以前的研究更早。我们估计Bølling-Allerød的沉积速率为~ 0.4 cm a−1，在新仙女木期降温事件期间增加到1 cm a−1，这可能与气候条件恶化导致的风暴波活动增加和海冰发展有关。新仙女木期沉积物上的侵蚀截断表明了晚更新世-全新世早期的相对海平面下降和相应的低洼。基于我们的新数据，我们建立了一个地质模型，突出了末次盛冰期以来的沉积过程，并展示了在冰川消融期间短期气候事件对前冰缘的潜在影响。

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引用次数: 0

6000 years of monsoon-driven east–west antiphasing of northeastern Brazil vegetation 6000年来季风驱动的巴西东北部植被的东西反相位

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2026-01-01 Epub Date: 2025-11-26 DOI: 10.1016/j.quascirev.2025.109723

Sergio Augusto Santos Xavier , Marie-Pierre Ledru , Ilana Wainer , Myriam Khodri , Francisca Soares de Araújo

Northeastern Brazil (NEB) is characterized by irregular rainfall distribution and various vegetation types, such as the xerophilous Caatinga in the east, Cerrado and Amazon rainforests in the west. Sediment cores and speleothems show that the region was subjected to strong climatic changes during the Holocene. To reconstruct related vegetation responses and biomass burning, we present a synthetic review based on nine pollen published records covering the last 6000 years. Our regional environmental reconstructions reveal four intervals of changes, influenced by the position and intensity of an east-west moisture band across NEB, in phase with South America Summer Monsoon variability. Between 6.0 and 5.2 ka BP and 5.2–4.2 ka BP, changes in the distribution of the dry forest Caatinga, Cerrado and Amazon Forest were driven by oscillating precipitation in a general pattern dry western/moist eastern NEB. Similar changes amongst sites were correlated to their location either within or outside the moisture band. Between 4.2 and 2.6 ka BP, Caatinga expanded in the eastern NEB, while Cerrado and Amazon forests became established in western NEB. This vegetation shift matches the moist western/dry eastern NEB climate around 4.2 ka BP, consistent with TraCE-21k simulations and speleothem records. From 2.6 ka BP onwards, biomass burning observed under dry or wet conditions was related to a marked increase in anthropogenic activities. For the last 6000 years NEB's vegetation boundaries have been in phase with the summer insolation, the oscillations of the South America Summer Monsoon, and the positions of the convergence zones which delimited a band of moisture throughout specific location of NEB. Human activities were not found to be directly affected by the humidity gradient; instead, humans have relied on each biome's resources. Investigating the extent of climatic and human influences on NEB vegetation in the past is crucial to discussing the effectiveness of current conservation policies in the region.

巴西东北部（NEB）降雨分布不规则，植被类型多样，东部有喜旱的Caatinga雨林，西部有塞拉多雨林和亚马逊雨林。沉积物岩心和岩洞显示，该地区在全新世期间经历了强烈的气候变化。为了重建相关的植被响应和生物质燃烧，我们基于近6000年的9个已发表的花粉记录进行了综合综述。我们的区域环境重建揭示了四个变化间隔，受横跨东北b的东西向水汽带的位置和强度的影响，与南美洲夏季风变异相一致。在6.0 ~ 5.2 ka BP和5.2 ~ 4.2 ka BP期间，Caatinga、Cerrado和亚马逊森林的分布变化主要受降水振荡驱动，呈现出西部干燥/东部湿润的总体格局，而不同站点之间的变化也与它们在湿润带内外的位置有关。在4.2 ~ 2.6 ka BP之间，Caatinga在NEB东部扩张，而Cerrado和Amazon森林在NEB西部建立。这种植被转移与4.2 ka BP左右NEB西部湿润/东部干燥的气候相匹配，与TraCE-21k模拟和洞穴记录一致。从2.6 ka BP开始，在干燥或潮湿条件下观测到的生物质燃烧与人为活动的显著增加有关。近6000年来，NEB的植被边界与夏季日照、南美夏季风的振荡以及在NEB特定地区划定水汽带的辐合带位置处于同一阶段，人类活动并未直接受到湿度梯度的影响；相反，人类依赖于每个生物群落的资源。调查过去气候和人类对新东部地区植被的影响程度，对于讨论该地区当前保护政策的有效性至关重要。

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引用次数: 0

Holocene sea-ice and productivity changes on the Scotian Shelf, NW Atlantic 西北大西洋苏格兰陆架全新世海冰与生产力变化

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2026-01-01 Epub Date: 2025-11-27 DOI: 10.1016/j.quascirev.2025.109694

Peter Matzerath , Henriette M. Kolling , Markus Kienast , Kirsten Fahl , Ruediger Stein , Felix Gross , Ralph R. Schneider

The Scotian Shelf is affected by the confluence of cold polar and warm Gulf Stream-influenced waters, making it particularly sensitive to record past ocean and climate variability. Despite this paleoenvironmental significance, major gaps in our understanding of Holocene ocean and climate dynamics persist, particularly in terms of sea ice and marine productivity. Here, we use a combination of biomarkers, specifically the sea-ice proxy IP₂₅, together with biomarkers for productivity (i.e., brassicasterol, dinosterol, total organic carbon) and terrigenous input (campesterol) in a sediment core from the northeastern Scotian Shelf to resolve Holocene changes in sea ice and marine productivity. During the Early Holocene, our results show increased spring sea-ice algae and reduced marine productivity, which we posit to be linked to a strongly reduced regional sea level together with increased inflow of meltwater favoring the formation of an expanded seasonal sea-ice cover on the Scotian Shelf. After 6 cal ka BP, the Scotian Shelf became predominantly free of sea ice due to a decreased influence of meltwater and a rise in local sea level. After 2.5 cal ka BP and coinciding with the Late Holocene Neoglacial cooling, the Scotian Shelf might have been affected by episodic sea-ice readvances, consistent with other regional on- and offshore paleoclimate studies. In summary, our records suggest a strong link between sea-ice extent, marine productivity, and Holocene variations in regional sea level, and ocean and atmosphere conditions, i.e., the strength of Gulf of St. Lawrence outflow and Labrador Current, and prevailing North Atlantic Oscillation anomalies.

苏格兰大陆架受到寒冷的极地和温暖的墨西哥湾流影响的海水汇合的影响，使它对记录过去的海洋和气候变化特别敏感。尽管具有这种古环境意义，但我们对全新世海洋和气候动力学的理解仍然存在重大差距，特别是在海冰和海洋生产力方面。在这里，我们使用生物标志物，特别是海冰代理IP25，以及生产力生物标志物（即油菜甾醇，甾醇，总有机碳）和陆源输入（油菜甾醇）的组合来解决全新世海冰和海洋生产力的变化。在全新世早期，我们的研究结果表明，春季海冰藻类增加，海洋生产力下降，我们认为这与区域海平面大幅下降以及融水流入增加有关，有利于在苏格兰大陆架上形成扩大的季节性海冰覆盖。在6 cal ka BP之后，由于融水的影响减弱和当地海平面上升，苏格兰陆架基本上没有海冰。在2.5 cal ka BP之后，与晚全新世新冰期冷却相吻合，苏格兰大陆架可能受到了间歇性海冰推进的影响，这与其他区域性陆地和近海古气候研究结果一致。总之，我们的记录表明，海冰范围、海洋生产力、全新世区域海平面变化、海洋和大气条件（即圣劳伦斯湾流出流和拉布拉多流的强度，以及北大西洋涛动的普遍异常）之间存在着密切的联系。

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引用次数: 0

Terrestrial ecosystem development since ∼21 ka in the core of the central Patagonian Andes (∼45°S) 巴塔哥尼亚中部安第斯山脉核心地带（~ 45°S） ~ 21 ka以来陆地生态系统的发展

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2026-01-01 Epub Date: 2025-11-27 DOI: 10.1016/j.quascirev.2025.109616

P.I. Moreno , J. Videla , R.P. Villa-Martínez

We examine the vegetation and environmental evolution on the central Patagonian Andes over the last ∼21,000 years. This mid-latitude region of South America (45°S) is strongly affected by glaciers, the Southern Westerly Winds (SWW), explosive volcanism, fires, and human activities. Our lake sediment records show the highest abundance of cold-tolerant herbs and shrubs during the final portion of the Last Glacial Maximum (=LGM), which decline after ∼17.9 ka and nearly disappear after ∼12 ka. Hygrophilous tree pollen increased at ∼17.4 ka and ∼14.7 ka followed by prominent increases in Nothofagus at ∼16.7 ka and ∼12.1 ka. An abrupt transition led to Nothofagus-dominated forests that have persisted since ∼12 ka with minor variations despite intense fire and explosive volcanic activity. We interpret cold and humid conditions during the LGM, followed by deglacial warming after ∼17.9 ka, wetting events at ∼16.7 ka and ∼14.7 ka associated with enhanced SWW influence, warming and a decline in precipitation and SWW influence at ∼12.6 ka, and warm-temperate and sufficiently wet conditions over the last ∼12,000 years. Disturbance by fire and explosive volcanism have driven intermittent episodes of fragmentation/canopy openness at centennial timescale during the Holocene, superposed upon hydrologic balance variations and human activities. Our results suggest that scattered populations of hygrophilous trees and herbs inhabited the eastern margin of the Patagonian Ice Sheet during the LGM and expanded toward the Pacific slopes and archipelagoes during the Last Glacial Termination, contributing to the afforestation of central-west Patagonia.

我们研究了过去~ 21000年来巴塔哥尼亚中部安第斯山脉的植被和环境演变。南美洲的这个中纬度地区（45°S）受到冰川、南西风（SWW）、爆炸性火山活动、火灾和人类活动的强烈影响。我们的湖泊沉积物记录显示，耐寒草本植物和灌木的丰度在末次盛冰期末期（=LGM）最高，在~ 17.9 ka后减少，在~ 12 ka后几乎消失。亲湿树木花粉在~ 17.4 ka和~ 14.7 ka增加，其次是Nothofagus在~ 16.7 ka和~ 12.1 ka显著增加。一个突然的转变导致nothofagus主导的森林自约12 ka以来一直存在，尽管有强烈的火灾和爆炸性的火山活动，但变化很小。我们解释了LGM期间的寒冷和潮湿条件，随后是~ 17.9 ka后的脱冰变暖，与SWW影响增强相关的~ 16.7 ka和~ 14.7 ka的湿润事件，与降水和SWW影响增强相关的~ 12.6 ka的变暖和减少，以及过去~ 12000年的温暖和充足潮湿条件。在全新世期间，由于水文平衡变化和人类活动的影响，在百年时间尺度上，火和爆炸性火山活动的干扰导致了间断性的破碎/冠层开放。研究结果表明，在LGM时期，巴塔哥尼亚冰盖东部边缘分布着散居的喜湿树木和草本植物种群，在末次冰期末期，它们向太平洋斜坡和群岛扩张，为巴塔哥尼亚中西部的植树造林做出了贡献。

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引用次数: 0

A 3He-based Holocene glacial chronology from Villarrica volcano, Chile 智利Villarrica火山全新世3he冰川年代学研究

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2026-01-01 Epub Date: 2025-11-24 DOI: 10.1016/j.quascirev.2025.109707

Yasmeen Orellana-Salazar , Shaun A. Marcott , Marissa M. Tremblay , Matias Romero , Pablo Moreno-Yaeger , Emily E. Mixon , Andrew G. Jones , Aaron M. Barth

Understanding alpine glacier extent during past climate variability is instructive for determining the glacier response to future climate change. Villarrica volcano is a late Pleistocene stratovolcano located in Chile's Southern Volcanic Zone that was covered by the Patagonian Ice Sheet during the last glacial period, and still retains small remnant glaciers today. Moraines preserved several kilometers from the summit on different flanks of the volcano record a history of expanded glacier lengths during the Holocene. However, the precise ages of these moraines are unknown, and the Holocene glacial history of Villarrica remains poorly constrained, limiting our understanding of how glaciers in this region responded to Holocene climate change. To constrain the timing of these moraines, we analyzed cosmogenic ³He in olivine from 25 basaltic andesite moraine boulders for cosmogenic surface exposure dating. Our new chronology reveals multiple late Holocene glacier advances from different flanks of the volcano, with the glaciers culminating and abandoning their moraines during the early Neoglacial period at ∼3355 ± 190 a and ∼1735 ± 215 a, and during the last millennium spanning the Little Ice Age period at ∼720 ± 225 a, ∼370 ± 75 a, and in the last ∼200 years. Our analysis of Holocene climate proxies from south-central Chile indicates that the early Neoglacial advances and subsequent retreat likely reflect increased effective moisture delivered by intensified Southern Westerly Winds and associated shifts in their latitudinal position. In contrast, we interpret the last millennium glacier advances as primarily driven by reduced summer ablation linked to regional cooling, followed by glacier retreat due to increased temperatures. Our chronology and closely spaced moraine positions suggest that glacier retreat on Villarrica, and possibly the broader Southern Volcanic Zone, has been gradual during the late Holocene and interrupted by short-lived advances driven by varying changes in temperature and moisture.

了解过去气候变率期间高山冰川的范围对确定冰川对未来气候变化的响应具有指导意义。维拉里卡火山是一座晚更新世的层状火山，位于智利南部火山区，在最后一个冰期被巴塔哥尼亚冰盖覆盖，今天仍然保留着小的残余冰川。从火山峰顶数公里外的不同侧面保存下来的冰碛记录了全新世期间冰川长度扩大的历史。然而，这些冰碛的确切年龄尚不清楚，而维拉里卡的全新世冰川历史仍然知之甚少，这限制了我们对该地区冰川如何应对全新世气候变化的理解。为了限制这些冰碛形成的时间，我们分析了25个玄武岩安山岩冰碛巨石中橄榄石中的宇宙成因3He，用于宇宙成因表面暴露测年。我们的新年代学揭示了火山不同侧翼的多个晚全新世冰川推进，冰川在新冰期早期（~ 3355±190 a和~ 1735±215 a）以及小冰河期（~ 720±225 a, ~ 370±75 a）的最后一个千年期间达到顶峰并放弃了它们的冰碛，并在最近的~ 200年。我们对智利中南部全新世气候代用物的分析表明，新冰期早期的推进和随后的后退可能反映了南西风增强所带来的有效水分的增加及其纬度位置的相关变化。相比之下，我们将上一千年的冰川推进解释为主要由与区域变冷相关的夏季消融减少驱动，随后是由于温度升高导致的冰川退缩。我们的年代学和紧密间隔的冰碛位置表明，在全新世晚期，维拉里卡的冰川退缩，可能还有更广泛的南部火山带，是渐进的，并被温度和湿度变化驱动的短暂进展所打断。

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引用次数: 0