Palaeogeography, Palaeoclimatology, Palaeoecology最新文献

Rapid retreat of the East Asian summer monsoon at the end of the Holocene humid period accelerated the transition from broadleaf to pine forest landscapes in northern China 全新世湿润期末期东亚夏季风的快速后退加速了中国北方阔叶林景观向松林景观的转变

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2026-01-29 DOI: 10.1016/j.palaeo.2026.113609

Linjing Liu , Xin Mao , Lei Song , Xingqi Liu , Dejun Wan , Gaolei Jiang , Jingsong Yang , Hongmei Zhao , Chengmin Wang , Hua Zhao , Rong Ma

Understanding how vegetation responded to abrupt climate change in the past is critical for predicting its future dynamics under rapidly changing conditions. The climatic transition that ended the Holocene humid period provides an ideal case study for investigating the vegetation response to abrupt drying and prolonged drought stress. In this study, a high-resolution pollen analysis and the Regional Estimates of Vegetation Abundance from Large Sites (REVEALS) model, which is based on relative pollen productivity, are used to quantitatively reconstruct the history of vegetation change from a lacustrine sediment sequence in the forest–steppe ecotone of northern China. Through a synthesis of regional pollen data, we reveal that the rapid southward retreat of the East Asian summer monsoon (EASM) between 6 and 5 ka BP did not cause a simple forest-to-steppe transition. Instead, it drove a shift from moisture-dependent broadleaf forests to drought-tolerant pine forests. We hypothesize that the region's complex topography buffered the environment against forest disappearance under unfavourable climatic conditions. However, the rapid transition from wet to dry climate exacerbated the drought stress on vegetation, driving forest type changes. These findings suggest that under future rapid climate change, vegetation responses may not follow simple advance or retreat patterns but could include the emergence of vegetation types distinct from those in modern forests.

了解过去植被对气候突变的响应对于预测其在快速变化条件下的未来动态至关重要。结束全新世湿润期的气候转变为研究植被对突然干旱和长期干旱胁迫的响应提供了一个理想的研究案例。本文利用高分辨率花粉分析和基于相对花粉生产力的区域植被丰度估算（reveal）模型，定量重建了中国北方森林-草原交错带湖泊沉积序列的植被变化历史。通过对区域花粉资料的综合分析，我们发现东亚夏季风（EASM）在6 ~ 5 ka BP之间的快速南退并没有引起简单的森林到草原的转变。相反，它推动了从依赖水分的阔叶林向耐旱松林的转变。我们假设该地区复杂的地形缓冲了不利气候条件下森林消失的环境。然而，气候从湿润到干燥的快速转变加剧了植被的干旱胁迫，推动了森林类型的变化。这些发现表明，在未来的快速气候变化下，植被响应可能不会遵循简单的前进或后退模式，而可能包括与现代森林中不同的植被类型的出现。

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引用次数: 0

Reestablishment of an early life shallow marine ecosystem in the Neoproterozoic Gardnos meteorite impact crater (Norway) 挪威新元古代Gardnos陨石坑早期浅海生态系统的重建

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2026-01-28 DOI: 10.1016/j.palaeo.2026.113607

Morten Smelror , Deta Gasser , Mathew Domeier , Øyvind Hammer

Trace fossils, microbially induced sedimentary structures (MISS), palynomorphs and particulate organic matter (POM) found in post-impact sediments in the Gardnos meteorite crater provide evidence of reestablishment of a Neoproterozoic ecosystem in a shallow marine, littoral environment, with sediments covered by microbial mats. Trace fossils are rare and restricted to horizontal burrows, including Gordia, Helminthopsis, Yichnia and poorly preserved tracks resembling Archaeonassa. MISS and water-escape structures are common and include characteristic features like Aristophycus. The recovered organic walled microfossils Trachysphaeridium laminaritum and Sphaerocongregus variabilis indicate a late Neoproterozoic age for the post-impact sediments. Particulate organic matter in deposits comprise dominantly dark grey to black, highly thermally altered amorphous kerogen and fragments of algal material (TAI ∼ 4, temperature ˃ 250 °C). The trace fossils and MISS are typical of Neoproterozoic shallow marine mat-ground environments which existed prior to the development of Phanerozoic mixed-ground ecosystems.

在加德诺斯陨石坑撞击后沉积物中发现的微量化石、微生物诱导沉积结构（MISS）、苔藓和颗粒有机质（POM）为在浅海、沿海环境中重建新元古代生态系统提供了证据，沉积物被微生物席覆盖。痕迹化石是罕见的，仅限于水平洞穴，包括Gordia， Helminthopsis， Yichnia和保存较差的类似Archaeonassa的足迹。MISS和水逃逸结构很常见，包括像马兜铃这样的特征。发现的有机壁微化石Trachysphaeridium laminarium和Sphaerocongregus variabilis表明撞击后沉积物的年代为新元古代晚期。沉积物中的颗粒有机质主要由深灰色到黑色，高度热蚀的无定形干酪根和藻类物质碎片组成（TAI ~ 4，温度250°C）。痕迹化石和MISS是新元古代浅海垫地环境的典型特征，早于显生宙混合地面生态系统的发育。

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引用次数: 0

Abyssal record of the Middle Eocene Climatic Optimum in the Tasman Sea: Insights from benthic foraminiferal and clay mineral assemblages 塔斯曼海中始新世气候最佳的深海记录：来自底栖有孔虫和粘土矿物组合的见解

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2026-01-27 DOI: 10.1016/j.palaeo.2026.113590

Irene Peñalver-Clavel , Elisa Laita , Edoardo Dallanave , Rupert Sutherland , Gerald R. Dickens , Thomas Westerhold , Blanca Bauluz , Laia Alegret

The Middle Eocene Climatic Optimum (MECO), a ∼500 kyr global warm interval at ∼40 Ma, interrupted the gradual cooling trend of the mid-late Eocene. Unlike Eocene hyperthermal events with rapid onsets and slow recoveries, the MECO began gradually, ended swiftly, and lacked a global negative carbon isotope excursion, raising questions about warming‑carbon cycling links. Here we report for the first time the response of benthic foraminifera, which are excellent palaeoenvironmental proxies, across the MECO at abyssal depths, integrating our results with a mineralogical analysis of the sediment.

International Ocean Discovery Program Site U1511 (Tasman Abyssal Plain, SW Pacific) was deposited below the carbonate compensation depth during the Eocene, and calcareous microfossils are absent. Agglutinated benthic foraminifera indicate a gradual onset of the environmental perturbations associated with the MECO, followed by rapid recovery. Changes in their assemblages, including the temporary disappearance of Lazarus taxa, the decreased abundance of suspension feeders and dominance of opportunistic detritivores, indicate weaker bottom-water currents during MECO and increased stratification of the water column. Mineralogical changes reinforce this interpretation, with increased smectite content indicating warm, humid conditions in the source-area, and possibly a change in the deep-water source. The reappearance of Lazarus taxa after the MECO indicates rapid recovery of deep-sea environmental conditions.

The comparison of Site U1511 with available studies from other regions reveals the complex and regionally diverse nature of benthic foraminiferal response to the MECO, emphasizing the critical role of ocean circulation and palaeogeography during Eocene warm intervals.

中始新世气候最适期（MECO）是一个约500 kyr的全球变暖间隔，约40 Ma，中断了始新世中后期的逐渐变冷趋势。与始新世开始迅速、恢复缓慢的高温事件不同，MECO开始缓慢，结束迅速，缺乏全球负碳同位素偏移，这引发了关于变暖与碳循环联系的问题。在这里，我们首次报道了底栖有孔虫的反应，这是一种优秀的古环境代用物，在深海深处横跨MECO，将我们的结果与沉积物的矿物学分析相结合。国际海洋发现计划遗址U1511（西南太平洋Tasman深海平原）沉积于始新世碳酸盐补偿深度以下，缺乏钙质微化石。凝集的底栖有孔虫表明与MECO相关的环境扰动逐渐开始，随后迅速恢复。它们组合的变化，包括Lazarus类群的暂时消失、悬浮食性动物丰度的减少和机会性腐食动物的优势，表明MECO期间底水流减弱，水体分层加剧。矿物学变化强化了这一解释，蒙脱石含量的增加表明源区温暖潮湿，可能是深水源区的变化。在MECO之后，Lazarus分类群的重新出现表明深海环境条件的迅速恢复。U1511站点与其他地区已有研究的对比揭示了底栖有孔虫对MECO响应的复杂性和区域多样性，强调了始新世暖期海洋环流和古地理的关键作用。

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引用次数: 0

Sharp rise in cormorant (Phalacrocorax auritus) populations on Lake Ontario islands inferred from analyses of pond sediment cores 从池塘沉积物岩心分析推断，安大略湖岛屿上鸬鹚（Phalacrocorax auritus）种群急剧上升

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2026-01-25 DOI: 10.1016/j.palaeo.2026.113603

Daniel Dagodzo , David C. Eickmeyer , Linda E. Kimpe , John P. Smol , Jules M. Blais

We measured biomarkers in pond sediment cores to infer population dynamics and track the ecological impacts of cormorants at East Brother Island (EBI), a cormorant-affected site, and Calf Island (CI), a reference site, in Lake Ontario over the past ∼170 years. Pronounced synchronous increases in cholesterol, cholestanol, cholestanone, coprostanol, epicoprostanol concentrations, expanded bird sterol index (EBSI), and δ¹⁵N values in the 1970s mark the establishment and rapid expansion of cormorant colonies at EBI. That time coincides with human-mediated environmental changes such as the regulation of organochlorine contaminants (e.g. DDT, PCBs), later introduction of invasive fish species, and reduced human disturbances. Declining C:N ratios and an initial increase in the plant stanol stigmastanol at EBI, following the initial colony establishment reflect short-term enhancement of terrestrial primary productivity driven by guano deposition. However, stigmastanol concentrations declined after ca. 1990, likely from vegetation degradation caused by the toxic effects of ammonia-rich guano and physical disturbances from bird nesting activities. We document the transformative impacts of cormorant populations on nutrient cycling, sediment processes, and vegetation dynamics at their nesting sites, providing a detailed record of how waterbird populations modify ecosystems over time, following their arrival. The findings highlight the value of integrating long-term ecological monitoring and adaptive management strategies to address the impacts of expanding waterbird populations, particularly in sensitive lacustrine environments.

我们测量了池塘沉积物岩心中的生物标志物，以推断种群动态，并跟踪过去~ 170年来在安大略湖的东兄弟岛（EBI）和小牛岛（CI）的鸬鹚影响点的生态影响。在20世纪70年代，胆固醇、胆固醇、胆甾酮、coprostanol、表前列腺醇浓度、扩展鸟固醇指数（EBSI）和δ15N值同步上升，标志着鸬鹚群落在EBI的建立和快速扩张。这段时间恰逢人类介导的环境变化，如对有机氯污染物（如滴滴涕、多氯联苯）的管制、后来引入入侵鱼类以及人为干扰减少。在EBI，随着初始群落的建立，C:N比率的下降和植物甾醇的初始增加反映了鸟粪沉积驱动的陆地初级生产力的短期增强。然而，大约在1990年之后，豆甾醇浓度下降，可能是由于富氨鸟粪的毒性作用和鸟类筑巢活动的物理干扰引起的植被退化。我们记录了鸬鹚种群对其筑巢地的营养循环、沉积物过程和植被动态的变革性影响，详细记录了水鸟种群在其到达后如何随时间改变生态系统。研究结果强调了将长期生态监测和适应性管理策略相结合的价值，以解决水鸟种群数量增加的影响，特别是在敏感的湖泊环境中。

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引用次数: 0

Cave deposits U-Pb chronology: insights into the timing of Myotragus antiquus, cave evolution, and Pliocene sea level in Mallorca 马略卡岛洞穴沉积物U-Pb年代学：对Myotragus古恐龙时代、洞穴演化和上新世海平面的见解

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2026-01-25 DOI: 10.1016/j.palaeo.2026.113604

Oana A. Dumitru , Angel Ginés , Victor J. Polyak , Joaquín Ginés , Pere Bover , Joan J. Fornós , Yemane Asmerom , Bogdan P. Onac

Cave deposits represent critical archives for reconstructing the timing of faunal evolution, speleogenesis, and sea-level change in coastal settings. Here, we present the first uranium‑lead (U-Pb) geochronological framework for the fossil-rich stratigraphy of Cova des Fum, Mallorca, offering new constraints on the age of the extinct goat Myotragus antiquus, the cave's speleogenetic history, and Pliocene sea-level history. Flowstone samples collected above and below a bone-bearing breccia yielded ages between 3.60 ± 0.77 Ma and 3.45 ± 0.68 Ma, placing the deposition of M. antiquus remains within the Late Pliocene. A basal flowstone age of 4.70 ± 0.55 Ma suggests that cave development began in the late Miocene, consistent with broader models of early speleogenesis in coastal eastern Mallorca. The stratigraphic succession, which includes interbedded aeolian calcarenites, suggests episodic sediment influx into a cave system already disconnected from active drainage. These flowstone ages, from an elevation of ∼82 m above present sea level, serve as terrestrial limiting points for sea-level reconstruction and align with other local estimates of Pliocene sea level derived from phreatic overgrowth on speleothems. By showing that M. antiquus is nearly one million years older than previously thought, this study provides the oldest well-resolved chronological constraints for the species, refines the timing of speleogenetic phases, and contributes new indirect evidence for Pliocene sea levels in the western Mediterranean.

洞穴沉积物是重建沿海地区动物进化、洞穴形成和海平面变化时间的重要档案。在这里，我们提出了马略卡岛Cova des Fum富化石地层的第一个铀铅（U-Pb）地质年代学框架，为灭绝山羊Myotragus antiquus的年龄、洞穴的洞穴形成历史和上新世海平面历史提供了新的限制。在含骨角砾岩上方和下方采集的流石样本的年龄在3.60±0.77 Ma至3.45±0.68 Ma之间，表明古m.a antiquus的沉积时间为晚上新世。基底流岩年龄为4.70±0.55 Ma，表明洞穴发育始于中新世晚期，与马略卡岛东部沿海地区早期洞穴形成的广泛模式相一致。地层演替，包括互层的风成钙质，表明幕式沉积物流入已经与活动排水系统断开的洞穴系统。这些流石年龄来自于高于目前海平面约82米的海拔高度，可作为海平面重建的陆地限制点，并与其他当地根据洞穴上的潜水过度生长得出的上新世海平面估计相一致。通过表明古猿古猿比之前认为的要早近100万年，这项研究为该物种提供了最古老的时间限制，完善了洞穴形成阶段的时间，并为地中海西部上新世海平面提供了新的间接证据。

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引用次数: 0

Different responses of stalagmite oxygen and carbon isotopes reveal interhemispheric phasing of climate during the Marine Isotope Stage 4 to 3 transition 石笋氧和碳同位素的不同响应揭示了海洋同位素阶段4 - 3的半球间气候相变

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2026-01-24 DOI: 10.1016/j.palaeo.2026.113580

Gong-Zhe Chen , Hao-Xiang Huang , Shi-Tao Chen , Shu Yang , Zhen-Jun Wang , Yong-Jin Wang , Xian-Feng Wang

Chronological uncertainties in paleoclimate records continue to obscure the interhemispheric phasing and driving mechanisms of Dansgaard–Oeschger (DO) events during the last glacial period. This study presents a high-precision ²³⁰Th-dated stalagmite record (YX53) from Yongxing Cave in central China, spanning 64.4–52.5 ka B.P. and covering DO events 18 to 14. The results show that variations in stalagmite δ¹⁸O, align closely in event structure with records of tropical precipitation, Intertropical Convergence Zone position, and Antarctic temperature, indicating a tropical–Southern Hemisphere climatic signal. In contrast, the δ¹³C record exhibits a pattern similar to Greenland temperature and dust variations, suggesting a primary response to North Atlantic climate variability. By analyzing the phase relationship between δ¹⁸O and δ¹³C within the same stalagmite, this study directly evaluates the relative timing of these climate signals under a unified chronology. We further improved the objectivity of the phase analysis by applying sub-decadal sampling, stricter statistical criteria, and intra-cave cross-validation. Results show that during the onset of DO events, changes in δ¹³C did not lag behind those in δ¹⁸O. This indicates that North Atlantic climate change was not delayed relative to tropical and Southern Hemisphere responses on decadal timescales, challenging the hypothesis of a Southern Hemisphere pacemaker for abrupt events during the Marine Isotope Stage 4 to 3 transition.

末次冰期Dansgaard-Oeschger （DO）事件的半球间相位和驱动机制在古气候记录中的不确定性继续模糊不清。本文研究了中国中部永兴洞230年代的高精度石笋记录（YX53），时间跨度为64.4 ~ 52.5 ka B.P.，涵盖DO事件18 ~ 14。结果表明，石笋δ18O的变化在事件结构上与热带降水、热带辐合带位置和南极温度记录密切一致，表明存在热带-南半球气候信号。相比之下，δ13C记录表现出与格陵兰岛温度和尘埃变化相似的模式，表明对北大西洋气候变率的主要响应。通过分析同一石笋内δ18O和δ13C的相位关系，直接评价了这些气候信号在统一年代学下的相对时序。通过采用次年代际采样、更严格的统计标准和洞内交叉验证，进一步提高了相分析的客观性。结果表明，在DO事件开始时，δ13C的变化不滞后于δ18O的变化。这表明，在年代际尺度上，北大西洋的气候变化相对于热带和南半球的响应并没有延迟，这挑战了在海洋同位素第4到第3阶段转变期间，南半球是突变事件的起搏器的假设。

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引用次数: 0

Weathering of the Gangdese Mountains and its impact on Paleogene seawater 87Sr/86Sr evolution 冈底斯山脉风化作用及其对古近系海水87Sr/86Sr演化的影响

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2026-01-24 DOI: 10.1016/j.palaeo.2026.113581

Xiaobai Ruan , Albert Galy

In this paper, the Sr geochemistry of rivers draining the eastern part of the Gangdese Mountains is used as an analogue to understand the contribution of this region to seawater ⁸⁷Sr/⁸⁶Sr ratios over the last 40 Ma. Dissolved Sr in the Chayu River Basin is radiogenic (⁸⁷Sr/⁸⁶Sr = 0.7313–0.7339) and more radiogenic compared to the adjacent Parlung Tsangpo Basin (0.7135–0.7174). In both basins, particulate detrital carbonates exhibit ⁸⁷Sr/⁸⁶Sr ratios consistent with the dissolved load. High dissolved K/Si ratios reflect the weathering of Rb-bearing minerals, yet their lack of covariation with ⁸⁷Sr/⁸⁶Sr ratios rules out silicate weathering as the driver of the radiogenic signal. Instead, this radiogenic Sr flux in the Chayu River Basin likely derives from the weathering of disseminated calcite. Disseminated calcite in granitoids of the eastern Gangdese Mountains, formed by melting during collision, records the mobilization of ⁸⁷Sr from less weatherable silicates into highly weatherable phases. Meanwhile, in the Parlung Tsangpo Basin, the less radiogenic signatures likely corresponds to the erosion and weathering of massive marine carbonate rocks that occur widely across that region. We infer that the Paleogene weathering of the radiogenic disseminated calcite within the eastern Gangdese and equivalent batholiths of the Lhasa, Tengchong and Sibumasu blocks likely triggered the rise in seawater ⁸⁷Sr/⁸⁶Sr at ∼40 Ma.

本文以冈底斯山脉东部河流的Sr地球化学为模拟物，研究了该地区近40 Ma来对海水87Sr/86Sr比值的贡献。察峪河流域溶解Sr具有放射性成因（87Sr/86Sr = 0.7313 ~ 0.7339），与邻近的帕隆羌布盆地（0.7135 ~ 0.7174）相比更具放射性成因。在两个盆地中，颗粒碎屑碳酸盐的87Sr/86Sr比值与溶解负荷一致。高溶解K/Si比值反映了含rb矿物的风化作用，但它们与87Sr/86Sr比值缺乏共变，排除了硅酸盐风化作为放射性成因信号驱动因素的可能性。察余河流域放射性成因的锶通量可能来源于浸染方解石的风化作用。冈底斯山脉东部花岗岩类中的浸染方解石是在碰撞过程中熔融形成的，记录了87Sr从不耐候硅酸盐向高耐候相的运移过程。同时，在帕隆藏布盆地，较少的放射性成因特征可能与广泛分布于该地区的块状海相碳酸盐岩的侵蚀和风化相对应。我们推测，冈底斯东部放射成因浸染方解石的古近系风化作用以及拉萨、腾冲和西布马苏地块的等效岩基可能引发了海水87Sr/86Sr在~ 40 Ma的升高。

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引用次数: 0

AI-driven quantitative classification of tropical cyclone intensity using Tridacna daily growth bands 利用Tridacna日增长带对热带气旋强度进行人工智能驱动的定量分类

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2026-01-24 DOI: 10.1016/j.palaeo.2026.113573

Qiuju Yang , Jianmiao Liao , Nanyu Zhao , Chengcheng Liu , Hong Yan

Understanding long-term tropical cyclone (TC) evolution requires high-resolution paleoclimate records at daily scales. Traditional proxies such as corals and sediments lack the resolution to resolve individual events. Although Tridacna shells exhibit daily growth bands with sub-weekly resolution, manual analysis of laser scanning confocal microscopy (LSCM) images is time-consuming and subjective, limiting their application for quantitative reconstructions. This study introduces an artificial intelligence (AI) framework to address these challenges. A dual-task generative adversarial network (DT-GAN) enhances LSCM image quality and enables precise segmentation of Tridacna daily growth bands. This approach improves processing efficiency by over five orders of magnitude compared to manual methods. By automatically extracting key features related to the daily growth increments and fluorescence intensity, we employ a long short-term memory (LSTM) network to classify TC intensity at daily resolution. Applied to a modern T. squamosa specimen from the South China Sea (2012−2013), our model achieved an accuracy of 85.14% in detecting TC occurrence and 81.71% in classifying seven intensity grades (0–6). This work establishes the first quantitative model linking Tridacna growth band features to TC activity, providing a robust methodological foundation for high-resolution paleotempestology using fossil shells.

了解热带气旋（TC）的长期演变需要高分辨率的日尺度古气候记录。珊瑚和沉积物等传统的代用物缺乏解决单个事件的分辨率。尽管砗磲蛤壳呈现出亚周分辨率的日生长带，但激光扫描共聚焦显微镜（LSCM）图像的人工分析既耗时又主观，限制了它们在定量重建中的应用。本研究引入了一个人工智能（AI）框架来应对这些挑战。一种双任务生成对抗网络（DT-GAN）提高了LSCM图像质量，实现了Tridacna日常生长带的精确分割。与手工方法相比，这种方法将处理效率提高了五个数量级以上。通过自动提取与日生长增量和荧光强度相关的关键特征，我们采用长短期记忆（LSTM）网络对日分辨率下的TC强度进行分类。应用于现代t squamosa标本从南海(2012−2013),我们的模型实现了85.14%的准确性检测TC发生和分类七81.71%强度等级(- 6)。本研究建立了第一个将砗磲生长带特征与TC活动联系起来的定量模型，为利用化石壳进行高分辨率古风暴学研究提供了坚实的方法基础。

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引用次数: 0

The inverse temperature effect of precipitation stable isotopes poses a challenge to the paleoclimate reconstructions 降水稳定同位素的逆温度效应对古气候重建提出了挑战

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2026-01-23 DOI: 10.1016/j.palaeo.2026.113587

Baijun Shang , Tong Li , Hui Gao , Feng Wang , Tonggang Fu

Stable isotopes (δ¹⁸O and δD) in precipitation have long served as key proxies for paleoclimate reconstructions under the assumption of a universal temperature effect (TE), where isotopic enrichment correlates with warming. However, this study identifies clear inverse temperature effects (ITE)—where isotopic depletion accompanies higher temperatures—across different climate types and time scales. Analyzing global precipitation isotope data, this study finds that low-latitude regions exhibit significant monthly-scale ITE, expressed as a δ¹⁸O-temperature regression slope (δ-T_ITE) down to −0.46 ‰/°C in Tropical summer. Conversely, high latitudes (> 40°N) maintain a clear TE, with a δ¹⁸O-temperature regression slope (δ-T_TE) up to 0.44 ‰/°C in Polar climate. The spatiotemporal variability in TE/ITE is driven by atmospheric circulation patterns: monthly-scale ITE in monsoon regions may be linked to moisture source shifts and convective precipitation dominance, whereas TE in high latitudes reflects direct temperature control on isotopic fractionation during condensation. Seasonal/interannual scales show weakened or insignificant TE/ITE in mid-low latitudes due to modulating effects of ENSO, monsoon dynamics, and the Intertropical Convergence Zone (ITCZ), which introduce other drivers like precipitation amount and vapour recycling. These results demonstrate that ignoring time-scale and climate-type dependencies may lead to unreliable paleoclimate reconstructions, while the identification of the ITE of stable isotopes provides a new perspective for stable-isotope based paleoclimate reconstruction research.

长期以来，稳定同位素（δ18O和δD）一直是在普遍温度效应（TE）假设下重建古气候的关键指标，其中同位素富集与变暖有关。然而，这项研究在不同的气候类型和时间尺度上确定了明确的逆温度效应（ITE）——同位素耗竭伴随着更高的温度。分析全球降水同位素资料发现，低纬度地区表现出显著的月尺度ITE，表现为热带夏季δ18 -温度回归斜率（δ-TITE）降至- 0.46‰/°C。相反，高纬度地区（> 40°N）保持明显的TE，极地气候δ18 -温度回归斜率（δ-TTE）高达0.44‰/°C。TE/ITE的时空变化受大气环流模式驱动：季风区月尺度的TE可能与水汽源转移和对流降水优势有关，而高纬度地区的TE反映了凝结过程中温度对同位素分馏的直接控制。在季节/年际尺度上，由于ENSO、季风动力和热带辐合带（ITCZ）的调制作用，中低纬度地区的TE/ITE减弱或不明显，而热带辐合带引入了降水和蒸汽再循环等其他驱动因素。这些结果表明，忽略时间尺度和气候类型依赖关系可能导致古气候重建不可靠，而稳定同位素ITE的识别为基于稳定同位素的古气候重建研究提供了新的视角。

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引用次数: 0

Quaternary history of aridification in the Hobq Desert of northern China, and its driving mechanisms 中国北方库布齐沙漠第四纪干旱化历史及其驱动机制

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2026-01-23 DOI: 10.1016/j.palaeo.2026.113592

Maotang Cai , Xingchen Yang , Zhigao Zhang , Xinling Li , Qiuyu Zhou , Yuanjian Zhou

The Hobq Desert of northern China is a major proximal sediment source for the Chinese Loess Plateau, and the sedimentary successions of this region are key for understanding the history of aridification in inland Asia. Here, we present a paleomagnetic chronology for the 402-m-thick DK Core drilled in the Hobq Desert. Using this chronology, we reconstruct the Quaternary history of aridification based on grain-size and environmental magnetic proxy data. Our results demonstrate that a desert environment has existed in this region since at least ∼2.5 Ma. A major intensification of aridity occurred at ∼1.1 Ma, coinciding with widespread mid-Pleistocene drying across Asia. Spectral analysis of aeolian sand components reveals a shift in orbital periodicities from dominant ∼40-ka cycles prior to ∼1.1 Ma to predominant ∼100-ka cycles thereafter. This shift aligns with the Mid-Pleistocene Transition, implicating global ice-volume forcing and phased uplift of the Tibetan Plateau as drivers of this climatic change. A shift to wetter conditions after ∼0.38 Ma was likely driven by an intensified and northward-migrating Asian Summer Monsoon, combined with regional tectonic activity. We conclude that the long-term evolution of the Hobq Desert was controlled by the combined effects of global orbital-scale climate forcing and regional tectonic factors.

中国北方的库布齐沙漠是中国黄土高原的主要近端沉积物源区，该地区的沉积序列是了解亚洲内陆干旱化历史的关键。本文对库布奇沙漠402m厚DK岩心进行了古地磁年代学研究。利用这一年代学，我们根据粒度和环境磁代资料重建了第四纪干旱化历史。我们的研究结果表明，该地区至少从2.5 Ma开始就存在沙漠环境。干旱的主要加剧发生在~ 1.1 Ma，与亚洲广泛的中更新世干旱相吻合。风成沙组分的光谱分析表明，在~ 1.1 Ma之前，轨道周期从主导的~ 40 ka周期转变为主导的~ 100 ka周期。这一转变与中更新世过渡相一致，暗示全球冰量强迫和青藏高原的阶段性隆起是这一气候变化的驱动因素。在~ 0.38 Ma之后转向更湿润的条件可能是由一个加强的和向北迁移的亚洲夏季风和区域构造活动共同驱动的。结果表明，库布齐沙漠的长期演变受全球轨道尺度气候强迫和区域构造因素的综合控制。

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引用次数: 0