Palaeogeography, Palaeoclimatology, Palaeoecology最新文献

Discerning biotic from abiotic carbonate cementations in Holocene beachrock: mineralogical and geochemical fingerprints for biosignatures 全新世滩岩中生物与非生物碳酸盐胶结的识别：生物特征的矿物学和地球化学指纹图谱

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2025-12-11 DOI: 10.1016/j.palaeo.2025.113454

Xi-yang Zhang , Ming-zhuang Wang , Qi Shi , Fei Tan , Guo-tao Zhang , Si-qi Chen , Hong-qiang Yang

Beachrock cementation, mediated by physicochemical and biological processes, plays a pivotal role in the rapid lithification of coastal sediments. Distinguishing between biotic and abiotic carbonate cements is critical for quantitatively reconstructing diagenetic pathways and accurately evaluating paleoenvironmental conditions. We analyzed Holocene beachrocks from Hainan and the Xisha Islands to compare their cement types. Beachrocks from Hainan are characterized by isopachous high-Mg calcite (HMC) rinds, HMC-rich peloidal fabrics, and blocky–drusy low-Mg calcite (LMC), whereas those from the Xisha Islands are dominated by acicular aragonite. HMC rinds composed of equilong fibrous crystals represent marine phreatic cements with minimal diagenetic alteration, whereas LMC forms through meteoric vadose processes, as indicated by red cathodoluminescent rings. Acicular aragonite nucleates within organic-rich micrite envelopes, with its rapid growth governed primarily by inorganic mechanisms. Peloidal fabrics exhibit distinct fluorescence patterns, dull cathodoluminescence, and elevated Mn/Fe ratios, consistent with their interpretation as microbially mediated precipitates formed during organic matter degradation under intermittently reducing conditions. Notably, peloidal fabrics and aragonite are enriched in bioactive metals (V, Fe, Zn, Pb) relative to coral Porites, consistent with active microbial metabolism. Unlike HMC rinds and acicular aragonite, peloidal fabrics display high total rare earth element (REE) contents, uniform REE distributions, LREE depletion (low LREE/HREE), negative Ce anomalies, positive La anomalies, Y/Ho ratios (∼45), and REE partitioning patterns closely matching modern seawater. These distinctive geochemical signatures establish peloidal fabrics as high-fidelity, high-resolution archives of paleo-seawater chemistry, providing a robust tool for deciphering ancient marine environments.

滩岩胶结作用是由物理化学和生物过程介导的，在海岸沉积物的快速岩化过程中起着关键作用。区分生物和非生物碳酸盐胶结物对于定量重建成岩路径和准确评价古环境条件至关重要。我们分析了海南和西沙群岛的全新世滩岩，比较了它们的胶结类型。海南滩岩以等径高镁方解石（HMC）表层、富HMC的似球粒状组构和块状低镁方解石（LMC）为主，西沙滩岩以针状文石为主。HMC环由等长纤维晶体组成，代表海洋潜水胶结物，成岩蚀变最小，而LMC则通过大气渗透过程形成，如红色阴极发光环所示。针状文石在富有机质泥晶包壳内成核，其快速生长主要受无机机制支配。Peloidal织物表现出明显的荧光模式、暗淡的阴极发光和升高的Mn/Fe比率，这与它们的解释一致，即在间歇性还原条件下有机物降解过程中形成的微生物介导的沉淀。值得注意的是，相对于珊瑚孔隙岩，peloidal fabric和文石富含生物活性金属（V, Fe, Zn, Pb），与活跃的微生物代谢一致。与HMC和针状文石不同，peloidal织物显示出高总稀土元素（REE）含量，均匀的REE分布，LREE枯竭（低LREE/HREE），负Ce异常，正La异常，Y/Ho比（~ 45），以及与现代海水密切匹配的REE分配模式。这些独特的地球化学特征使peloidal织物成为高保真度，高分辨率的古海水化学档案，为破译古代海洋环境提供了强大的工具。

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引用次数: 0

Modern pollen analysis on peatlands across monsoonal China and its implications for reconstruction 中国季风期泥炭地现代花粉分析及其重建意义

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2025-12-11 DOI: 10.1016/j.palaeo.2025.113491

Shu Chen , Mengmeng Wang , Chunmei Ma , Tianyi Tang , Rui Ke , Jiaming Hou , Xinrong Zhang , Zhuo Zheng , Xiayun Xiao , Yan Zhao , Huayu Lu

Interpreting information documented in fossil pollen provides valuable insights into viewing and dealing with the on-going global change, while linking modern pollen to vegetation and the environment makes paleoenvironmental reconstructions possible. The reliability of quantitative reconstruction depends on the comprehensive understanding of the relationship between the proxy and its determinants, and the applicability of this relationship. Monsoonal China is a forested and densely populated region spanning various climatic and vegetation zones. Fossil pollen sequences from peatlands of monsoonal China are frequently studied, but the assumptions ensuring a reliable reconstruction remained untested. In this study, we compiled 56 peatland surface pollen assemblages, compared them to the neighboring soil surface pollen assemblage and vegetation composition data, and examined the response of our peatland surface pollen assemblages to environmental variables. Through quantitative analysis, we confirmed the representation of pollen for vegetation at both compositional and vegetational level, and demonstrated the taphonomic effect with differences in pollen composition and vegetation representation between two sediment types. Peatland surface pollen shows higher diversity, higher non-arboreal pollen abundance, lower arboreal pollen abundance and higher vegetation representative power than soil surface pollen because of a larger pollen source area. Climate sets the foundation in modern pollen assemblages across monsoonal China. However, in subregions, an abnormal positive correlation between herbaceous pollen and temperature suggests the incorporation of human influence into this correlation. Therefore, reconsideration of the ecological nature of correlations is needed for improving the reliability of climate reconstruction.

解读花粉化石记录的信息为观察和应对正在发生的全球变化提供了有价值的见解，同时将现代花粉与植被和环境联系起来，使古环境重建成为可能。定量重建的可靠性取决于对代理及其决定因素之间关系的全面理解，以及这种关系的适用性。季风中国是一个森林和人口稠密的地区，跨越了各种气候和植被带。来自中国季风期泥炭地的化石花粉序列经常被研究，但确保可靠重建的假设仍然未经检验。在本研究中，我们收集了56个泥炭地表面花粉组合，并将其与邻近土壤表面花粉组合和植被组成数据进行了比较，研究了泥炭地表面花粉组合对环境变量的响应。通过定量分析，我们在成分和植被水平上确认了植被花粉的代表性，并论证了两种沉积物类型在花粉组成和植被代表性上的差异所产生的地学效应。由于花粉源面积较大，泥炭地地表花粉比土壤地表花粉具有更高的多样性、更高的非乔木花粉丰度、更低的乔木花粉丰度和更高的植被代表性。气候为季风性中国的现代花粉组合奠定了基础。然而，在分区中，草本花粉与温度之间的异常正相关表明，人类影响也纳入了这种相关性。因此，为了提高气候重建的可靠性，需要重新考虑相关性的生态性质。

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引用次数: 0

Late-Quaternary sediments around the wind gap accelerate the wind-gap migration following the Dadu-Anning river capture event 大渡河—安宁河捕获事件后，风隙周围晚第四纪沉积物加速了风隙迁移

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2025-12-11 DOI: 10.1016/j.palaeo.2025.113497

Qiaoqiao Guo , Xibin Tan , Chao Zhou , Yijia Ye , Xun Zeng , Shuang Bian , Yiduo Liu , Feng Shi , Lupeng Yu

Following a river capture event, a new drainage divide forms between the capture point and the beheaded river, and then migrates toward the beheaded river at a much higher rate than before the capture event. The intersection between the abandoned river channel and the newly-formed drainage divide is called a “wind gap”. Sediments around wind gaps are commonly used to infer paleo-drainage pathways and constrain the timing of capture events. However, recent studies suggest that these sediments may primarily originate from ongoing proximal sedimentary processes rather than from ancient great river deposits. Here, we conducted a detailed optically stimulated luminescence chronological analysis of the sediments around the wind gap between the Dadu and Anning Rivers, and further assessed the stability of the Dadu-Anning drainage divide. The results indicate that these sediments are not remnants of the southward-flowing Paleo-Dadu-Anning River, as most of the sediment ages (4–145 ka) are significantly younger than the Dadu-Anning capture event (∼0.6–2.4 Ma). Instead, they are post-capture deposits located at the headwaters of the beheaded river, which accelerate the wind-gap migration after the capture event. This study highlights the significance of sedimentation at the headwaters of the beheaded river in shaping landscape dynamics following a river capture event.

在河流捕获事件之后，在捕获点和被斩首的河流之间形成了一条新的排水分界线，然后以比捕获事件之前高得多的速度向被斩首的河流迁移。废弃的河道与新形成的分水岭之间的交汇处被称为“风隙”。风隙周围的沉积物通常用于推断古排水路径和限制捕获事件的时间。然而，最近的研究表明，这些沉积物可能主要来自正在进行的近端沉积过程，而不是来自古老的大河沉积。在此基础上，对大渡河与安宁河风隙周围的沉积物进行了详细的光激发光年代学分析，并进一步评价了大渡河与安宁河水系的稳定性。结果表明，这些沉积物不是南流古大都-安宁河的残余物，因为大多数沉积物年龄（4-145 ka）明显比大都-安宁捕获事件（~ 0.6-2.4 Ma）年轻。相反，它们是位于断头河源头的捕获后沉积物，加速了捕获事件后的风隙迁移。本研究强调了在河流捕获事件后，断头河源头的沉积在形成景观动力学中的重要性。

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引用次数: 0

The dispersal and ecological adaptation of microlithic populations on the Tibetan Plateau

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2025-12-10 DOI: 10.1016/j.palaeo.2025.113485

Shuguang Ma , Guangliang Hou , Xinyue Zhang , Qianqian Wang , Youcheng Chen , Zhuoma WenDe , Xuan Shi , Zhirui Hou , Zhonghua Tang

The Yellow River headwaters region, located within the Tibetan Plateau's extreme-environment belt, has long lacked archaeological sites with intact stratigraphy and precise chronological control, limiting our understanding of human adaptation and mobility in high-altitude settings. This study focuses on the newly discovered GD site and integrates lithic typology with multiple environmental proxies and spatial models—MaxEnt species distribution modelling (SDM), the standard deviational ellipse (SDE) and mean center (MC) to quantify centroid shifts, and least-cost paths (LCPs)—to reconstruct the dispersal trajectories and ecological adaptation of microlithic groups from the Last Deglaciation onward along the Plateau's northeastern margin–hinterland transect. The results show that by ca. 13.4 ka, human groups were active near ca. 4000 m a.s.l.; even during the Younger Dryas, they likely exploited short warm-season windows for seasonal hunting, demonstrating notable adaptive flexibility to cold, hypoxic environments. Spatial analyses further reveal that the MC shifted from lower to higher elevations along valley corridors and closely aligned with the LCPs, exhibiting strong spatial coupling with a ‘hunting corridor’ delineated by MaxEnt SDM for Ovis ammon, Marmota himalayana, and Procapra picticaudata. During intervals of climatic amelioration, this corridor expanded and became more connected, providing stable faunal support for migration and seasonal occupation. Variation in lithic raw-material endowment likewise conditioned the technological organisation and mobility strategies of microlithic populations. Taken together, the discovery of the GD site not only extends the chronology of microlithic occupation on the Tibetan Plateau but—within a resources–routes–behaviour framework—also clarifies the pivotal role of hunting corridors in driving human dispersal and high-altitude adaptation.

本研究以新发现的GD遗址为研究对象，将岩屑类型学与maxent物种分布模型（SDM）、标准差椭圆（SDE）和平均中心（MC）等多种环境指标和空间模型相结合，利用最小成本路径（lcp）重建末次冰期以来青藏高原东北缘腹地样带微岩屑类群的扩散轨迹和生态适应性。结果表明：约13.4 ka时，人类在约4000 m a.s.l附近活动；即使在新仙女木时期，它们也可能利用短暂的暖季窗口进行季节性狩猎，显示出对寒冷、缺氧环境的显著适应性。空间分析进一步表明，MC沿山谷走廊由低海拔向高海拔转移，与lcp紧密对齐，与MaxEnt SDM为喜马拉雅旱獭、野地旱獭和原野地旱獭描绘的“狩猎走廊”表现出强烈的空间耦合。在气候改善期间，这条走廊扩大并变得更加紧密，为迁徙和季节性占领提供了稳定的动物支持。岩屑原料禀赋的变化同样制约了微岩屑种群的技术组织和流动策略。

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引用次数: 0

Editorial preface to special issue: Tethyan Tectonic Domain in China 特刊社论前言：中国特提斯构造域

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2025-12-09 DOI: 10.1016/j.palaeo.2025.113496

Weihong He , Yichun Zhang , Xiaozhong Ding

To advance our understanding of the interactions between sedimentary, palaeontological, palaeogeographic, palaeoclimatic changes and tectonics in China's Tethyan Tectonic Domain, we contribute the special issue spanning from the Neoproterozoic to the Holocene. The 20 papers can be categorized into two thematic groups: (1) interconnections between sedimentary, palaeogeographic features and tectonics during the evolution of the Proto-Tethyan Ocean, and (2) interconnections among sedimentary, palaeontological, palaeoclimatic features and tectonics during the evolution of the Palaeo-Tethyan and Neo-Tethyan oceans and the uplift of the Tibetan Plateau. This contribution offers critical insights into the evolution of Tethyan oceans and plateau uplift, exemplifying the complex feedback and interaction between Earth's interior and surface processes. We think the collection will attract readers from diverse disciplines within the geosciences.

为了加深对中国特提斯构造域沉积、古生物、古地理、古气候变化与构造相互作用的认识，我们撰写了从新元古代到全新世的特刊。这一贡献为特提斯海洋和高原隆起的演变提供了重要的见解，说明了地球内部和表面过程之间复杂的反馈和相互作用。我们认为这个合集将吸引来自地球科学不同学科的读者。

引用次数: 0

Paleo-productivity sensitivity to monsoonal and eddy dynamics in the central-western South China Sea since the Last Glaciation 末次冰期以来南海中西部古生产力对季风和涡旋动力学的敏感性

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2025-12-09 DOI: 10.1016/j.palaeo.2025.113487

Miaomiao Liu , Dizhu Cai , Junrong Fang , Zhilong Cheng , Wei Li , Fanquan Kong , Jiaji Yi , Hongbing Wang , Guanhua Li

Marine paleo-productivity (PP) plays a pivotal role in shaping global ecosystems and regulating carbon cycling, particularly in the context of global climate change. Marginal seas are particularly sensitive to climatic fluctuations and oceanic current anomalies, making them critical zones for PP studies. As the largest marginal sea in the western Pacific, the South China Sea (SCS) exhibits pronounced spatial and temporal PP variability, with the central-western region showing particularly complex PP patterns. This study investigates the PP evolution based on a sediment core from the central-western SCS since the Last Glacial Period, addressing the underlying driving factors of PP variations by combining microfossil and geochemical indicators. Results demonstrate significantly higher PP during the Last Glacial Period compared to the Holocene, aligning broadly with records from the northern SCS but contrasting with those from the southern SCS. A detailed comparison also highlights subtle discrepancies between the central-western and the northern SCS, suggesting that the study area may represent a transitional zone in regional PP dynamics. A key finding of this research is the role of sea-level-driven eddy dynamics in modulating PP, together with the monsoonal variations. During the Last Glacial Period, lowered sea levels displaced cold eddies towards deeper basins, enhancing nutrient upwelling and surface productivity; in contrast, rising sea levels during the Holocene shifted eddies closer to coastal zones, reducing their nutrient transport efficiency and suppressing PP. These insights underscore the spatial heterogeneity of PP across the SCS and illustrate the broader implications of marginal sea dynamics. In addition, the study advocates for future integration of the sedimentary PP records with paleoceanographic modelling to better understand the biogeochemical impacts of eddy systems on PP evolution in low-latitude marginal seas.

海洋古生产力（PP）在塑造全球生态系统和调节碳循环方面发挥着关键作用，特别是在全球气候变化的背景下。边缘海对气候波动和洋流异常特别敏感，是PP研究的关键区域。南海是西太平洋最大的边缘海，其PP分布具有明显的时空变异性，其中中西部地区PP分布尤为复杂。本研究基于末次冰期以来南海中西部沉积物岩心研究了PP的演化，结合微化石和地球化学指标探讨了PP变化的潜在驱动因素。结果表明，末次冰期的PP值明显高于全新世，与南海北部的记录基本一致，但与南海南部的记录形成鲜明对比。详细的比较还突出了南海中西部和北部之间的细微差异，表明研究区可能代表了区域PP动态的过渡区。本研究的一个关键发现是海平面驱动的涡旋动力学在调制PP中的作用，以及季风变化。在末次冰期，海平面降低使冷涡向更深的盆地移动，增强了营养物上升流和地表生产力；相比之下，全新世期间海平面上升使涡旋更靠近沿海地带，降低了它们的营养物质运输效率并抑制了PP。这些见解强调了整个南海PP的空间异质性，并说明了边缘海洋动力学的更广泛含义。此外，该研究还提倡将沉积PP记录与古海洋学模拟相结合，以更好地了解涡旋系统对低纬度边缘海PP演化的生物地球化学影响。

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引用次数: 0

Metacommunity structural changes of Antarctic benthic invertebrates over the late Maastrichtian 马斯特里赫特晚期南极底栖无脊椎动物的元群落结构变化

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2025-12-09 DOI: 10.1016/j.palaeo.2025.113495

Tasnuva Ming Khan , Rowan J. Whittle , James D. Witts , Huw J. Griffiths , Andrea Manica , Emily G. Mitchell

Seymour (Marambio) Island, Antarctica has one of the most expanded onshore Cretaceous–Paleogene sedimentary successions in the world. The deposition of the López de Bertodano Formation (∼70–65.6 Ma) covered a time of fluctuating sea temperatures, including cold snaps, and warming linked to Deccan Traps volcanism. Here, we study community dynamics of uppermost Cretaceous (Maastrichtian) Antarctic invertebrates using fossils from the Zinsmeister Collection, Paleontological Research Institution, USA, in order to assess ecological complexity prior to the Cretaceous–Paleogene (K–Pg) mass extinction. Our data set consists of 7400 fossils from 85 genera across bivalves, gastropods, cephalopods, echinoderms, brachiopods, scaphopods, polychaetes and octocorals, from 324 localities within six informal sub-units, KLBs 5–9. Due to positional uncertainty of the KLB boundaries, we performed sensitivity analyses to ensure robust results. We found that the number of significantly non-random taxonomic co-occurrences and complexity increased throughout this period. To investigate metacommunity structure that may arise from taxa interactions or environmental filtering, we used the Elements of Metacommunity Structure framework, where we found that taxa replacement, rather than nestedness, increased through time, also highlighting complexity. However, our sensitivity analyses found that our metacommunity results could not be distinguished from sampling biases in the most conservative sensitivity test. Thus, whilst we can be confident that ecological complexity increased throughout the Maastrichtian, the detailed community mechanisms behind this increase cannot be firmly established; nonetheless, this result reinforces the presence of a single, rather than two-fold, K–Pg extinction in the southern high latitudes.

南极洲的西摩岛（Marambio）拥有世界上最广阔的陆上白垩纪-古近纪沉积序列之一。López de Bertodano组（~ 70-65.6 Ma）的沉积覆盖了一个海洋温度波动的时期，包括寒流和与德干圈闭火山活动有关的变暖。本文利用美国古生物研究所Zinsmeister Collection的化石，研究了南极马斯特里希特地区上白垩纪（Maastrichtian）的无脊椎动物群落动态，以评估白垩纪-古近纪（K-Pg）大灭绝前的生态复杂性。我们的数据集包括双壳类、腹足类、头足类、棘皮类、腕足类、舟足类、多毛类和八爪珊瑚等85属的7400块化石，来自6个非正式亚单位（klb5 - 9）的324个地点。由于KLB边界的位置不确定性，我们进行了敏感性分析以确保稳健的结果。我们发现，在这一时期，显著非随机的分类共现的数量和复杂性增加了。为了研究可能由分类群相互作用或环境过滤产生的元群落结构，我们使用了元群落结构的元素框架，我们发现分类群的替换，而不是嵌套，随着时间的推移而增加，也突出了复杂性。然而，我们的敏感性分析发现，在最保守的敏感性测试中，我们的元群落结果不能与抽样偏差区分开来。因此，虽然我们可以确信整个马斯特里赫特的生态复杂性增加了，但这种增加背后的详细社区机制不能牢固地建立起来；尽管如此，这一结果强化了南方高纬度地区K-Pg灭绝的单一存在，而不是两次。

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引用次数: 0

Late Cenozoic wildfire evolution in East-Central Asia: A microcharcoal record from the Junggar Basin 中亚东部晚新生代野火演化：准噶尔盆地微炭记录

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2025-12-08 DOI: 10.1016/j.palaeo.2025.113488

Gaihong Niu , Yunfa Miao , Xuelian Wang , Xiaoze Li , Ziyue Zhang , Yaguo Zou , Shabir Ahmad

Wildfires are important for understanding climate and ecosystem changes, especially in East–Central Asia. However, the wildfire history remains unclear, which limits our understanding of the wildfire process and its underlying mechanisms. In this study, the wildfire history of the Junggar Basin (central Asia) from the Late Miocene to the Early Pleistocene is reconstructed for the first time on the basis of microcharcoal analysis of 213 samples from the ZK1 core (from a depth of 137 m, with a palaeomagnetic chronological framework of 6.56–2.44 Ma). The results exhibit increasing trends in both the microcharcoal flux (McF: 4914–257,370 grains·m⁻²·Ma⁻¹) and grain-type ratios, including the ratio of sublong/subrounded grains (MC_L/MC_R: 0.01–0.13; classified by length/width ratio > 2.5/≤2.5) and the ratio of large/small fractions (MC_La/MC_Sm: 0.00–0.10; based on >50/≤50 μm size thresholds). This finding indicates that wildfires generally intensified in the region, characterized by an increased contribution from local wildfire sources and a greater proportion of herbaceous fuel from the Late Miocene. This observed increase in wildfire activity in the ZK1 core is consistent with four other records across East–Central Asia (namely, the Boguzihe section, Yangtze River delta, IODP Site U1430, and IODP Site U1501), collectively revealing a common pattern in which wildfire activity increased across the region from the Late Miocene. This trend conforms with the ongoing aridification process from the Late Miocene in Asia against the backdrop of global cooling. We hypothesize that sustained drought from the Late Miocene, driven by global cooling, was likely the primary factor that caused wildfire intensification, with additional influences from the uplift of the Tibetan Plateau and Tianshan Mountains.

野火对于了解气候和生态系统变化非常重要，特别是在东亚和中亚。然而，野火的历史尚不清楚，这限制了我们对野火过程及其潜在机制的理解。本文通过对ZK1岩心213个样品（深度为137 m，古地磁年代学框架为6.56 ~ 2.44 Ma）的微炭分析，首次重建了中亚准噶尔盆地晚中新世至早更新世的野火历史。结果表明，微炭通量（McF: 4914 ~ 257,370粒·m−2·Ma−1）和颗粒类型比(包括亚长/亚圆颗粒比（MCL/MCR: 0.01 ~ 0.13，按长/宽比>； 2.5/≤2.5划分）和大/小颗粒比（MCLa/MCSm: 0.00 ~ 0.10，基于>；50/≤50 μm尺寸阈值）均呈增加趋势。这一发现表明，该地区的野火普遍加剧，其特点是当地野火来源的贡献增加，晚中新世草本燃料的比例更大。ZK1岩心野火活动的增加与中亚东部的其他四个记录（即博格子河剖面、长江三角洲、IODP遗址U1430和IODP遗址U1501）一致，共同揭示了晚中新世以来整个地区野火活动增加的共同模式。这一趋势与全球变冷背景下亚洲晚中新世以来持续的干旱化过程相一致。我们假设，全球变冷导致的晚中新世持续干旱可能是导致野火加剧的主要因素，青藏高原和天山山脉的隆升也有额外的影响。

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引用次数: 0

How Kuroshio current, Tsushima warm current, and Yellow Sea warm current co-evolved since the middle Holocene 全新世中期以来黑潮、对马暖流和黄海暖流是如何共同演化的

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2025-12-08 DOI: 10.1016/j.palaeo.2025.113490

Xiaochuan Ma , Lingjing Xu , Dezhou Yang , Beibei Mi , Lin Jia , Fengming Chang

The Kuroshio-related warm current system in the northern East China Sea significantly influences the climate, ecosystems, and fisheries of Northeast Asia. However, the relationship between the evolutions of Kuroshio Current (KC), Yellow Sea Warm Current (YSWC), and Tsushima Warm Current (TWC) since the middle Holocene is still elusive. In this study, by analyzing the variations in the upper ocean heat content and other proxy records in the Okinawa Trough, we investigated the changes in the KC strength, which exhibit significant fluctuations closely tied to El Niño-Southern Oscillation (ENSO) activity. The results reveal that KC and YSWC were intensified and TWC was weakened during 4.0–5.5 ka and 1.0–2.0 ka, under more La Niña-like conditions and strong East Asian Winter Monsoon (EAWM). Conversely, during 2.0–3.0 ka and 0.5–1.0 ka, El Niño-like conditions and the associated weaker EAWM were responsible for the diminished KC and YSWC and a stronger TWC. It suggests that the ENSO activity likely primarily controls the collaborative variations of these currents through modulating the KC and the monsoon. These findings provide insights for predicting future changes of the western pacific western boundary current system in the context of ongoing global climate change, emphasizing the need for continued high-resolution paleoceanographic studies.

东海北部与黑潮相关的暖流系统对东北亚气候、生态系统和渔业具有重要影响。然而，全新世中期以来黑潮、黄海暖流和对马暖流的演化关系尚不明确。本研究通过分析冲绳海槽上层海洋热含量的变化和其他代用记录，研究了KC强度的变化，KC强度表现出与El Niño-Southern涛动（ENSO）活动密切相关的显著波动。结果表明，在La Niña-like偏强、东亚冬季风（EAWM）强烈的条件下，4.0 ~ 5.5 ka和1.0 ~ 2.0 ka期间KC和sswc增强，TWC减弱。相反，在2.0-3.0 ka和0.5-1.0 ka期间，El Niño-like条件和相关的弱EAWM导致KC和YSWC减少，TWC增强。这表明ENSO活动可能主要通过调节KC和季风来控制这些洋流的协同变化。这些发现为预测未来全球气候变化背景下西太平洋西边界流系统的变化提供了新的思路，强调了继续开展高分辨率古海洋学研究的必要性。

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引用次数: 0

Relationship between carbon isotopes of C3 plants and temperature depends on plant functional types, specific plant species, and the temperature range C3植物碳同位素与温度的关系取决于植物的功能类型、特定的植物种类和温度范围

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2025-12-08 DOI: 10.1016/j.palaeo.2025.113492

Guoan Wang , Jiamao Han , Yutao Zhou

Understanding the relationship between carbon isotope compositions (δ¹³C) of plants and climate is essential for applying δ¹³C in reconstructions of paleoclimate and paleoecology. However, the relationship between C₃ plant δ¹³C and temperature remains uncertain. This study utilizes a large isotope dataset from our plant samples collected across China to evaluate the influence of temperature on C₃ plant δ¹³C across different temperature ranges, at both the plant functional type (PFT) and species levels, and to also explain the inconsistencies in the findings of previous studies.

The δ¹³C of C₃ plants, as a group, first increases and then decreases with rising mean annual temperature (MAT), with a turning point around 0 °C. The δ¹³C-MAT relationship depends on PFTs, specific plant species, and the temperature range. Most angiosperms show a significant correlation between δ¹³C and MAT, but gymnosperms and conifers do not respond strongly to temperature. The correlation is weaker at the species level than when considering all C₃ plants or PFTs. These findings not only provide a better explanation for the inconsistencies in previous studies, but also indicate that the isotopic data from tree rings should be interpreted with caution. Additionally, it is better to use averages from multiple species rather than single plants during paleoclimate and paleoecology studies. Finally, we reconstruct the C₄ plant abundance during the Last Glacial Maximum at five locations in the Loess regions of northern China by applying the relationship between plant δ¹³C and temperature derived from this study, combined with established relationships between plant δ¹³C and other environmental factors reported in previous studies. This reconstruction demonstrates that the C4 plant abundances at Jingtai, Qingyang, Weiyuan, Lantain, and Xingyang ranged from 0 to 6.8 %, 0–14.3 %, 0–9.6 %, 0–17.7 %, and 0–16.7 %.

了解植物碳同位素组成（δ13C）与气候的关系，是将δ13C应用于古气候和古生态重建的基础。但C3植物δ13C与温度的关系尚不确定。本研究利用来自中国各地植物样本的大型同位素数据集，在植物功能类型（PFT）和物种水平上评估了温度对不同温度范围内C3植物δ13C的影响，并解释了以往研究结果的不一致性。C3植物的δ13C随年平均气温的升高先升高后降低，并在0℃左右出现拐点。δ13C-MAT关系与pft、特定植物种类和温度范围有关。大部分被子植物的δ13C与MAT之间存在显著的相关关系，而裸子植物和针叶树对温度的响应不强烈。与考虑所有C3植物或PFTs相比，在物种水平上的相关性较弱。这些发现不仅为以往研究的不一致性提供了更好的解释，而且表明对树木年轮同位素数据的解释应谨慎。此外，在古气候和古生态研究中，使用多物种的平均值比使用单一植物的平均值更好。最后，利用本研究得到的植物δ13C与温度的关系，结合已有的植物δ13C与其他环境因子的关系，重建了末次盛冰期中国北部黄土地区5个地点的C4植物丰度。结果表明，景台、庆阳、威远、兰山和荥阳的C4植物丰度分别为0 ~ 6.8%、0 ~ 14.3%、0 ~ 9.6%、0 ~ 17.7%和0 ~ 16.7%。

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