Quaternary Science Reviews最新文献_第4页

Late Holocene hydroclimatic anomalies in the NW Japan Sea: Distinguishing moisture sources and Pacific linkages 日本海西北部晚全新世水文气候异常：区分水汽来源和太平洋联系

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2025-12-22 DOI: 10.1016/j.quascirev.2025.109757

N.G. Razjigaeva , L.A. Ganzey , T.A. Grebennikova , L.M. Mokhova , P.S. Belyanin , E.A. Shekman , V.I. Ponomarev , T.A. Kopoteva , M.A. Klimin , Kh.A. Arslanov , F.E. Maksimov

High-resolution multi-proxy records (diatom, macroremain, pollen and ash content) of the late Holocene, using two paleolake sequences from the Peter the Great Bay coast (Southern Russian Far East), were aimed to reconstruct hydroclimatic changes and examining their links to summer and winter monsoon intensity, cyclogenesis activity, and hazardous events. Ages were determined based on radiocarbon dating and tephrostratigraphy with the sediments containing the Baitoushan cryptotephra. Sedimentation rates and changes in biotic components over time were evaluated. We conducted a comparative analysis of the paleoclimatic events with potential climate drivers responsible for them. The formation of the “southern” paleolake in the place of the desalinated lagoon occurred ∼4060 cal yr BP, and the swamp began to develop ∼3370 cal yr BP, which coincides with the beginning of a prolonged period of droughts associated with a decrease in the intensity of the summer monsoon, cyclogenesis, and precipitation in the land-ocean marginal zone of the Asian-Pacific region. The “central” paleolake, which existed from 3600 cal yr BP, became isolated from the sea and a swamp developed from 1500 cal yr BP. The vegetation of adjacent areas has been reconstructed. Pollen spectra reveal signs of ancient human activity in the coastal landscapes. The study area experienced two “dry” cold events, comparable to events recorded globally (2800–2600, and 1700–1300 cal yr BP), and a highly humid Little Ice Age. The period from 945 to 830 cal yr BP was the warmest, but moisture level decreased during this time. It is assumed that regional climate changes in the Asia-Pacific region were caused by hydrodynamic processes in the ocean-atmosphere system, associated with anomalies in meridional heat and moisture transfer. These processes lead to strengthening or weakening, of tropical and extratropical cyclogenesis, which in turn affect the summer monsoon, and the dynamics of sea surface temperature. Additionally, the El Niño, and the activity of the Kuroshio and Tsushima currents were also linked to these climatic changes. The studied areas have recorded the passage of extreme storms and tsunamis.

全新世晚期的高分辨率多代理记录（硅藻、巨残体、花粉和灰分含量），利用俄罗斯南部远东彼得大帝湾沿岸的两个古湖泊序列，旨在重建水文气候变化，并研究它们与夏季和冬季季风强度、气旋活动和危险事件的联系。根据放射性碳定年和含白头山隐毯的沉积物地层测定了年龄。评估了沉积速率和生物成分随时间的变化。我们对古气候事件与潜在的气候驱动因素进行了对比分析。在淡化湖位置形成“南部”古湖发生在~ 4060 cal yr BP，沼泽开始发育~ 3370 cal yr BP，这与亚太地区陆海边缘地带夏季风强度减弱、气旋形成和降水减少相关的长期干旱的开始相吻合。“中央”古湖泊存在于3600 calyr BP，从1500 calyr BP开始与海洋分离，形成沼泽。对相邻区域的植被进行了重建。花粉谱揭示了沿海地区古代人类活动的迹象。研究区域经历了两次“干”冷事件，与全球记录的事件（2800-2600和1700-1300 cal yr BP）相当，以及一个高度潮湿的小冰河期。945 ~ 830 calyr BP是最温暖的时期，但在此期间湿度有所下降。假定亚太地区的区域气候变化是由海洋-大气系统的水动力过程引起的，与经向热湿传递异常有关。这些过程导致热带和温带气旋形成的增强或减弱，进而影响夏季风和海面温度的动态。此外，厄尔尼诺Niño、黑潮和对马流的活动也与这些气候变化有关。研究区域记录了极端风暴和海啸的经过。

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引用次数: 0

‘Fire Islands’: Holocene wildfire intensity as a critical determinant of carbon accumulation in South Atlantic peatlands “火岛”：全新世野火强度是南大西洋泥炭地碳积累的关键决定因素

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2025-12-19 DOI: 10.1016/j.quascirev.2025.109759

Clemens von Scheffer , Dmitri Mauquoy , Thomas Theurer , Daniel Coathup , David Muirhead

Until recently, quantifying wildfire intensity in palaeoecological records has not been possible. Therefore, little is known about the link between past wildfire intensity, carbon accumulation and climate.

This study presents a history of burning and carbon accumulation spanning ∼15,500 years across a peat profile recovered from the Falkland Islands, including commonplace charcoal as evidence for frequent natural burning since the onset of peat formation. Utilising Raman spectra of preserved macrocharcoal fragments, we applied a recent cone calorimeter-based calibration to reconstruct changes in multi-fire intensity. In the early Holocene, wetter local conditions are reflected in higher carbon accumulation rates, variable charcoal fluxes, low burning intensities, and more diverse vegetation. Wildfire intensity started to increase between 8000 and 6000 cal BP with maximum intensities between approx. 4000 and 1000 cal BP, while carbon accumulation rates constantly declined. These developments concur with major changes in climate and in the position and strength of the southern westerly winds, potentially desiccating biomass and fuelling combustion. Fuel availability and type due to peatland succession processes also plays a role in wildfire intensity changes.

Our data show a strong negative correlation between burning intensities and carbon accumulation rates and, strikingly, between burning intensity and charcoal flux. This demonstrates that high charcoal fluxes are not necessarily equivalent to high fire intensities, and that the opposite might often be true. Given the latter, we suggest caution to researchers extrapolating wildfire behaviour solely upon the presence of macrocharcoal.

直到最近，在古生态记录中量化野火强度还是不可能的。因此，人们对过去野火强度、碳积累和气候之间的联系知之甚少。本研究展示了从福克兰群岛恢复的泥炭剖面中跨越约15,500年的燃烧和碳积累历史，包括普通木炭作为自泥炭形成开始以来频繁自然燃烧的证据。利用保存的大炭碎片的拉曼光谱，我们应用了最近的基于锥量热计的校准来重建多火强度的变化。在全新世早期，局地条件较湿润，表现为碳积累速率较高，炭通量变化较大，燃烧强度较低，植被种类较多。山火强度在8000 ~ 6000 cal BP之间开始增加，最大强度在8000 ~ 6000 cal BP之间。4000 ~ 1000 cal BP，碳积累速率不断下降。这些发展与气候的重大变化以及南西风的位置和强度一致，可能使生物质干燥并助长燃烧。泥炭地演替过程导致的燃料可用性和类型也在野火强度变化中起作用。我们的数据显示，燃烧强度与碳积累速率之间存在很强的负相关，燃烧强度与木炭通量之间也存在显著的负相关。这表明，高木炭通量并不一定等同于高火灾强度，而相反的情况可能往往是正确的。鉴于后者，我们建议谨慎的研究人员推断野火行为仅在宏观木炭的存在。

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引用次数: 0

An upper Pleistocene to present geomagnetic field record from Lake Cuitzeo (Central-Western Mexico) 奎策奥湖（墨西哥中西部）上更新世地磁记录

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2025-12-18 DOI: 10.1016/j.quascirev.2025.109751

Nayeli Pérez-Rodríguez , Juan Morales , Isabel Israde-Alcántara , Gabriela Domínguez-Vázquez , Miguel Cervantes-Solano , Avto Goguitchaichvili

Sedimentary lake sequences provide a database of Earth magnetic field variations, preserving information about its direction and intensity over time. Their (semi)continuous nature offers a distinct advantage over discrete geomagnetic records by enabling the development of high-resolution regional paleomagnetic curves. In this study, we present results of magnetic mineralogy and geomagnetic field variations from a 9.6-m-long sediment core retrieved from Lake Cuitzeo, Mexico, covering the past ∼40,000 years. Using a multiproxy approach that integrates rock magnetic and lithological analyses, supported by radiocarbon dating, we identify a previously reported geomagnetic instability zone between 19 and 24 kyr, along with potential records of geomagnetic excursions within the Brunhes normal polarity chron. Ninety-five new inclination values are provided, representing a significant addition to the existing paleomagnetic dataset for Mexico. Finally, we discuss relative paleointensity estimates derived from normalization techniques.

沉积湖泊序列提供了地球磁场变化的数据库，保存了其方向和强度随时间变化的信息。它们的（半）连续性质与离散地磁记录相比具有明显的优势，可以开发高分辨率的区域古地磁曲线。在这项研究中，我们展示了从墨西哥奎策奥湖（Lake Cuitzeo）提取的9.6 m长的沉积物岩心的磁矿物学和地磁场变化的结果，该岩心覆盖了过去~ 40,000年的时间。在放射性碳定年法的支持下，我们使用了一种综合岩石磁性和岩性分析的多代理方法，确定了之前报道的19至24 kyr之间的地磁不稳定区，以及在Brunhes正极性时间内的地磁偏移的潜在记录。提供了95个新的倾角值，这是对墨西哥现有古地磁数据集的重要补充。最后，我们讨论了由归一化技术得到的相对古强度估计。

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引用次数: 0

Glycerol dialkyl glycerol tetraethers (GDGTs) in cryoconites of the Tibetan Plateau Glaciers: Environmental controls and proxy implications

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2025-12-18 DOI: 10.1016/j.quascirev.2025.109756

Quanlian Li , Xiaobo Wu , Huan Yang , Shichang Kang , Ninglian Wang , Fengteng Wang , Yuan Yao , Shijin Wang , Tanuj Shukla , Wasim Sajjad , Yao Li , Jingquan Wu , Xiang Jin

Glycerol dialkyl glycerol tetraethers (GDGTs) are unique microbial membrane lipids widely preserved in geological archives. However, their occurrence and behavior in glacial environments remain poorly understood. Here, we analyze GDGTs in cryoconite samples from seven glaciers across the Tibetan Plateau (TP) to investigate their distribution, explore their biological origins, identify the environmental controls on their distribution, and evaluate their potential as paleoenvironmental proxies. The results reveal that archaeal-derived isoprenoid GDGTs (isoGDGTs) dominate in glaciers characterized by low mean annual precipitation (MAP) and higher cryoconite pH, whereas bacterial-derived branched GDGTs (brGDGTs) are more abundant in glaciers with higher MAP and lower pH. BrGDGTs-inferred pH values closely align with measured cryoconite pH values at each glacier, indicating substantial in situ production. Temperature reconstructions based on brGDGTs match more closely with mean summer air temperature (MST) than with WorldClim-derived mean annual air temperature (MAAT), suggesting that brGDGTs in cryoconites primarily reflect warm season air temperature on the TP glaciers. These results affirm the potential of GDGTs as valuable proxies for reconstructing past glacial environments, while also highlight the necessity to develop region-specific calibrations to improve the reliability and accuracy of cryospheric paleoenvironmental reconstructions.

甘油二烷基甘油四醚（GDGTs）是一种独特的微生物膜脂，广泛保存在地质档案中。然而，它们在冰川环境中的出现和行为仍然知之甚少。结果表明，古细菌衍生的类异戊二烯类GDGTs （isoGDGTs）在低平均年降水量（MAP）和高冰凝石pH的冰川中占主导地位，而细菌衍生的分枝GDGTs （brGDGTs）在高平均年降水量（MAP）和低pH的冰川中更为丰富。brGDGTs推断的pH值与每个冰川测量的冰凝石pH值密切一致，表明大量的原位生产。基于brGDGTs的温度重建结果与平均夏季气温（MST）的拟合程度较好，与worldclima提供的年平均气温（MAAT）的拟合程度较低，这表明冻土中的brGDGTs主要反映TP冰川暖季气温。这些结果肯定了GDGTs作为重建过去冰川环境的有价值的替代指标的潜力，同时也强调了开发特定区域校准以提高冰冻圈古环境重建的可靠性和准确性的必要性。

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引用次数: 0

Sulfur isotopes evidence spatial ecology of Late Pleistocene ungulates in southwestern France 法国西南部晚更新世有蹄类动物空间生态学的硫同位素证据

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2025-12-17 DOI: 10.1016/j.quascirev.2025.109744

Sarah Barakat , Elodie-Laure Jimenez , Raija Katarina Heikkilä , Aurélien Royer , Jamie Hodgkins , Laura Niven , Marie-Cécile Soulier , Susan Lagle , Christelle Dancette , Teresa E. Steele , Jean-Christophe Castel , Shannon McPherron , Jean-Jacques Hublin , Karen Ruebens , Emmanuel Discamps , Kate Britton

Understanding prey species spatial behaviour is key to unravelling contemporary hunter-gatherer subsistence and movement patterns. Here, we use sulfur (δ³⁴S), carbon (δ ¹³C) and nitrogen (δ ¹⁵N) isotope compositions of bone collagen extracted from Rangifer, Equus, Bovinae, Capreolus, and Cervus (n = 244) to explore isotope spatial and dietary niches of several key hunter-gatherer prey species from three Late Pleistocene sites in southwestern France between MIS 5 and MIS 3. Alongside morphological identification, Zooarchaeology by Mass Spectrometry (ZooMS) was used to confirm deer taxa (n = 125) allowing for a better interpretation of the isotopic data. δ³⁴S analysis identifies differences in ranging sizes between ungulates with known large ranging sizes from those with small to medium size ranges. Rangifer, who, today, have large home ranges, have the largest range of δ³⁴S values and lowest δ³⁴S values with low to no overlap with other ungulate species through time. This indicates that Rangifer had a larger range size with a distinct isotopic area that is different to other ungulates, potentially farther inland and farther north. Bovines and Equus have largely overlapping δ³⁴S values that are similar to the modern local δ³⁴S value of the sites, and Cervus and Capreolus have δ³⁴S values that overlap but are slightly higher than the modern δ³⁴S values, potentially indicating a ranging area to the west of the sites. These results reveal that Neanderthals hunted three different groups of game who occupied different areas of the landscape.

了解猎物物种的空间行为是解开当代狩猎采集者生存和运动模式的关键。本文采用硫（δ 34s）、碳（δ 13C）和氮（δ 15N）同位素组成分析了法国西南部3个晚更新世遗址（MIS 5 ~ MIS 3）中Rangifer、Equus、Bovinae、Capreolus和Cervus （n = 244）的骨胶原。除了形态学鉴定外，还使用动物考古学质谱法（ZooMS）来确定鹿的分类群（n = 125），从而更好地解释同位素数据。δ34S分析确定了已知大小大小的有蹄类动物与已知大小大小的有蹄类动物之间的差异。放牧动物的δ34S值变化幅度最大，与其他有蹄类动物的δ34S值变化幅度最小，与其他有蹄类动物的δ34S值变化幅度很小，甚至没有重叠。这表明Rangifer的范围更大，同位素区域也更明显，与其他有蹄类动物不同，可能更远的内陆和更远的北方。牛科和马科的δ34S值大部分重叠，与遗址的现代局部δ34S值相似；鹿科和卡波洛科的δ34S值重叠，但略高于现代的δ34S值，可能表明遗址的西部有一个范围。这些结果表明，尼安德特人猎杀三种不同的猎物，这些猎物占据了这片土地的不同区域。

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引用次数: 0

Eemian climate seasonality reconstructed from intra-tooth oxygen, carbon, and nitrogen stable isotopes in equid enamel from Neumark-Nord 2, Germany 利用德国诺伊马克-北2号马科牙釉质牙内氧、碳和氮稳定同位素重建伊米亚气候季节特征

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2025-12-15 DOI: 10.1016/j.quascirev.2025.109724

Marissa Vink , Jennifer N. Leichliter , Daniel R. Green , Sven Brömme , Théo Tacail , Lutz Kindler , Wil Roebroeks , Sabine Gaudzinski-Windheuser , Gerald H. Haug , Hubert B. Vonhof , Alfredo Martínez-García , Thomas Tütken , Tina Lüdecke

Reconstructing the climate of central Europe during the Eemian serves a dual purpose. First, the Eemian represents the most recent pre-Holocene period of widespread climate warming, and its vegetation structure offers a potential natural baseline for temperate European vegetation, as it was unaffected by large-scale anthropogenic alterations. Second, because Neanderthals lived in Europe during this period, understanding the climate provides insights into their environmental adaptations.

Here we examined seasonal climate variation at a sub-annual scale during the early Eemian (ca. 121 ± 5 ka) by analyzing oxygen isotopes (δ¹⁸O_CO3) in tooth enamel of 14 serially sampled equid third molars from the Neanderthal occupation site of Neumark-Nord 2 (NN2), Germany. These specimens were retrieved from find level NN2/2B, which spans less than 500 years. Stable carbon (δ¹³C_CO3) and mineral-bound nitrogen isotopes (δ¹⁵N_mb) were measured in the same enamel aliquots to assess seasonal influences on diet.

Intra-tooth δ¹⁸O_CO3 values show clear sinusoidal seasonal patterns, indicating mean annual temperatures of 11 ± 1 °C, which are closely aligned with previously published Eemian estimates and slightly higher than present-day values. However, modeled water δ¹⁸O suggest stronger seasonal contrasts than today, with summers ∼5 °C warmer and similar winter conditions. δ¹³C_CO3 values indicate a semi-open habitat and more annual precipitation than today. Notably, δ¹³C_CO3 and δ¹⁵N_mb values show no seasonal variation, implying stable year-round equid diets and consistent plant availability despite pronounced climate seasonality.

重建埃米亚时期中欧的气候有双重目的。首先，Eemian代表了最近的前全新世气候变暖时期，其植被结构为温带欧洲植被提供了潜在的自然基线，因为它不受大规模人为变化的影响。其次，由于尼安德特人在这一时期生活在欧洲，因此了解气候有助于了解他们对环境的适应。本文通过分析来自德国诺伊马克-诺德2 （NN2）尼安德特人居住地点的14个连续取样的第三磨牙牙釉质中的氧同位素（δ18OCO3），研究了伊姆纪早期（约121±5 ka）亚年尺度的季节气候变化。这些标本来自NN2/2B层，跨度不到500年。稳定碳（δ13CCO3）和矿物结合氮同位素（δ15Nmb）在相同的珐琅质等价物中测量，以评估季节对饮食的影响。齿内δ18OCO3值显示出明显的正弦季节模式，表明年平均温度为11±1°C，这与以前发表的Eemian估计值非常接近，略高于现在的值。然而，模拟的水δ18O显示出比现在更强的季节差异，夏季温度升高~ 5°C，冬季条件相似。δ13CCO3值表明一个半开放的生境和比现在更多的年降水量。值得注意的是，δ13CCO3和δ15Nmb值没有季节性变化，这意味着尽管气候季节性明显，但全年马科动物的饮食稳定，植物可利用性一致。

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引用次数: 0

Holocene hydroclimate and landscape dynamics inferred from Lake Pangodi, Estonia 爱沙尼亚潘戈地湖全新世水文气候与景观动力学研究

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2025-12-15 DOI: 10.1016/j.quascirev.2025.109750

Mariliis Eensalu , Nathan D. Stansell , Tomi P. Luoto , Anna Buczynska , Anneli Poska , Jaanus Terasmaa , Tiit Vaasma , Egert Vandel , Eric S. Klein , Ansis Blaus , Siim Veski , Daniel B. Nelson

Understanding how past climate variability and human activity shaped northern European landscapes is essential for interpreting present-day environmental change. However, high-resolution Holocene records that capture both climatic and anthropogenic signals in small lake catchments remain relatively scarce in the eastern Baltic region. This study addresses that gap by reconstructing Holocene climate and environmental dynamics from the sedimentary material of Lake Pangodi, a semi-closed basin in southern Estonia. We present a multi-proxy reconstruction of Holocene climate and environmental change based on stable isotope geochemistry, sedimentology, pollen, and chironomid records. Stable isotope data document abrupt environmental changes that coincide with regionally recognized early–middle and middle–late Holocene transitions in northern Europe. The early Holocene (∼11,700–8200 cal a BP) was characterized by relatively wet conditions and elevated terrigenous sediment influx. This was followed by a drier and more stable middle Holocene (8200–4200 cal a BP) and a more variable late Holocene (4200 cal a BP–present). Chironomid-inferred temperatures indicate warming during the early Holocene and relatively stable warm season temperatures thereafter. Pollen data reveal transitions from early boreal dominance to temperate forest expansion beginning around 8800 cal a BP, followed by a return to more boreal-dominated assemblages after ∼4800 cal a BP. Increased crop pollen after ∼850 cal a BP indicates growing human influence on the landscape. These shifts align with regional vegetation chronozones and reflect both climatic and anthropogenic drivers. An abrupt shift to the highest sediment flux at ∼4200 cal a BP coincides with the transition to the late Holocene, suggesting a regional environmental reorganization that was likely linked to both climatic and landscape changes, including increased hydrological variability and land surface instability.

了解过去的气候变化和人类活动是如何塑造北欧景观的，对于解释当今的环境变化至关重要。然而，在波罗的海东部地区，捕获小湖泊集水区气候和人为信号的高分辨率全新世记录相对较少。本研究通过从爱沙尼亚南部半封闭盆地Pangodi湖的沉积材料中重建全新世气候和环境动力学来解决这一空白。基于稳定同位素地球化学、沉积学、花粉学和chironomid记录，提出了全新世气候和环境变化的多指标重建方法。稳定同位素资料表明，北欧地区的环境突变与区域公认的全新世早中期和中晚期转变相吻合。早全新世（~ 11700 ~ 8200 cal a BP）以相对湿润的环境和陆源沉积物流入增加为特征。随后是一个更干燥、更稳定的中全新世（8200-4200 cal a BP）和一个更多变的晚全新世（4200 cal a BP - present）。chironomi -推断温度表明全新世早期变暖，此后暖季温度相对稳定。花粉数据显示，从大约8800 cal a BP开始，从早期北方森林优势向温带森林扩张转变，随后在约4800 cal a BP之后，回归到以北方森林为主的组合。大约850 cal a BP之后，作物花粉增加表明人类对景观的影响越来越大。这些变化与区域植被年代带一致，反映了气候和人为驱动因素。在~ 4200 cal a BP时，沉积物通量突变至最高，这与向全新世晚期的过渡相吻合，表明区域环境重组可能与气候和景观变化有关，包括水文变异性增加和陆地表面不稳定性。

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引用次数: 0

Rapid thinning of the Cordillera Darwin Icefield at the onset of Termination I 科迪勒拉达尔文冰原在终止期1开始时迅速变薄

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2025-12-15 DOI: 10.1016/j.quascirev.2025.109754

B.L. Hall , A.E. Putnam , T.V. Lowell , G.H. Denton , J.L. Russell , R.L. Soteres , M.M. Spoth-Ascencao , M.L. Miles , S.G. Thomas , P.I. Moreno , R. Schwartz , J.M. Schaefer

Despite more than a century of research, the cause of the last ice-age termination remains uncertain. Here, we reconstruct the thinning history of the Cordillera Darwin Icefield, southernmost Chile, to track relative summer temperature change at the end of the ice age and to explore potential drivers of the warming. Eighteen ¹⁰Be exposure ages of erratics perched on glacially scoured bedrock indicate rapid surface lowering of at least 500 m elevation in the heart of the former icefield at some time between 18.8 and 16.9 ka at the onset of the termination. We infer that this drop in ice level reflects an increase in summer temperatures, which led to extensive glacier melt. We attribute the underlying cause to a poleward shift of the southern westerly winds, which placed the Cordillera Darwin Icefield in warmer air masses with temperatures incompatible with its LGM extent.

尽管经过了一个多世纪的研究，最后一次冰河时代结束的原因仍然不确定。在这里，我们重建了智利最南端的达尔文冰原的变薄历史，以跟踪冰期结束时夏季的相对温度变化，并探索变暖的潜在驱动因素。位于冰川冲刷基岩上的18个不稳定物的10Be暴露年龄表明，在冰原终止开始的18.8至16.9 ka之间的某个时间，原冰原中心的地表高度至少下降了500米。我们推断，冰位的下降反映了夏季气温的上升，这导致了广泛的冰川融化。我们认为根本原因是南西风向极地移动，使达尔文冰原处于温度与其LGM范围不相容的暖气团中。

引用次数: 0

Extreme flood deposits in the Roya Valley during the Holocene: characterisation and recurrence intervals 全新世期间罗亚河谷的极端洪水沉积：特征和复发间隔

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2025-12-15 DOI: 10.1016/j.quascirev.2025.109749

Raphaël Kerverdo , S. Lafuerza , C. Gorini , E. Fouache , D. Granjeon , N. Bianchi , N. Haghipour , R. Clementucci , N. Loget , S. Migeon , R. Deschamps

Floods are among the costliest natural disasters, causing extensive damage and fatalities worldwide. Mountainous regions of the Mediterranean Alps are highly vulnerable to extreme hydrological events, whose frequency is increasing in the context of climate change favouring convective storms. In October 2020, the Roya valley was struck by an extreme hydrological event. The amount of rainfall (return period >1000yr) and discharge (>100yr), triggered major geomorphological changes, including subsantial channel widening, slope destabilisation and extensive bank erosion.

This study provides unprecedented sedimentological data on torrential dynamics in the Roya Valley, based on ¹⁴C and OSL dating of newly exposed flooding deposits following Storm Alex. Five clusters of preserved fluvial and torrential deposits ranging from the Younger Dryas–Holocene transition to the Little Ice Age are identified. These preservation clusters correspond to periods of wetter condition and anthropogenic influence.

By combining sedimentological analyses with documented pollen and sediments records from lakes in the Mercantour massif, as well as historical archives, this study presents one of the first flood-frequency reconstructions for a Mediterranean Alpine catchment over a multi-millennial timescale. Past flooding events (on centennial to millennial scales) leave distinctive sedimentary signatures, characterised by thick deposits and the mobilisation of coarse particles, before being reworked within the broader autogenic dynamics of the river system. Reconstructing the frequency and occurrence of past extreme flood events provides key insights into the conditions under which such events occurr, and offers valuable information for the development of flood-risk scenarios, particularly in mountainous areas that are among the most affected by contemporary climate change.

洪水是最昂贵的自然灾害之一，在世界范围内造成广泛的破坏和死亡。地中海阿尔卑斯山区极易受到极端水文事件的影响，在有利于对流风暴的气候变化背景下，极端水文事件的频率正在增加。2020年10月，罗亚山谷遭受了一次极端水文事件的袭击。降雨量（回归期>；1000年）和流量（>；100年）引发了重大的地貌变化，包括大幅拓宽河道、边坡不稳定和广泛的河岸侵蚀。本研究基于亚历克斯风暴后新暴露的洪水沉积物的14C和OSL测年，为罗亚河谷的暴雨动力学提供了前所未有的沉积学数据。确定了从新仙女木-全新世过渡到小冰期的5个保存完好的河流和急流沉积群。这些保存集群对应于湿润条件和人为影响的时期。通过将沉积学分析与梅尔坎图尔地块湖泊的花粉和沉积物记录以及历史档案相结合，本研究提出了地中海阿尔卑斯流域在数千年时间尺度上的首次洪水频率重建之一。过去的洪水事件（在百年到千年的尺度上）留下了独特的沉积特征，其特征是厚沉积物和粗颗粒的动员，然后在更广泛的河流系统自生动力学中被重新加工。重建过去极端洪水事件的频率和发生，为了解这些事件发生的条件提供了关键的见解，并为洪水风险情景的发展提供了宝贵的信息，特别是在受当代气候变化影响最严重的山区。

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引用次数: 0

Shift of the upper ocean thermal structure across the Mid-Brunhes Event in the Eastern Tropical Indian Ocean 热带印度洋东部中布朗什事件中上层海洋热结构的转移

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2025-12-15 DOI: 10.1016/j.quascirev.2025.109747

Junru Zhang , Fengming Chang , Ann Holbourn , Fang Qian , Luyao Tang , Tiegang Li

Upper ocean temperature and stratification play essential roles in regulating hydrological processes from regional to basin scales and in shaping climate systems. The Eastern Tropical Indian Ocean (ETIO), as a major source of heat and moisture, is critical to regional and large-scale hydroclimatic variability. However, the long-term evolution of its upper water thermal structure remains poorly constrained. Here, we reconstruct sea surface temperature (SST) and thermocline water temperature (TWT) records spanning the past 620 ka using planktonic foraminiferal Mg/Ca ratios from Core 18548 and IODP Site U1482 off the northwest Australian margin. The results reveal that both SST and TWT exhibit pronounced glacial–interglacial cyclicity, primarily paced by orbital-scale forcing, including the 100-ka and precession (23/19-ka) periodicities. Notably, TWT displays a stronger precession signal than SST. These orbital-scale variations reflect the modulation of heat transfer to the ETIO through sea-level-controlled Indonesian Throughflow (ITF) dynamics and precession-driven atmospheric circulation. The amplified TWT response arises from the combined effects of ITF-mediated thermocline advection and insolation-induced vertical mixing, which together regulate upper ocean heat redistribution. A significant shift in the gradient between SST and TWT (ΔT) around 400 ka, coinciding with the MBE, indicates a major reorganization of upper ocean thermal structure, likely driven by glacioeustatic sea-level fluctuations and changes in precession-induced wind systems. Our findings highlight the coupled forcing of 100-ka cycle and precession on upper ocean thermal evolution in the ETIO and offer critical insights into orbital-scale heat redistribution and tropical ocean-climate interactions.

上层海洋温度和分层在调节从区域到流域尺度的水文过程以及形成气候系统方面发挥着重要作用。东热带印度洋（ETIO）作为热量和水分的主要来源，对区域和大尺度的水文气候变化至关重要。然而，对其上部水热构造的长期演化仍知之甚少。本文利用18548号岩芯和U1482号IODP站点的浮游有孔虫Mg/Ca比值重建了过去620 ka的海表温度和温跃层水温记录。结果表明，海温和行波热均表现出明显的冰期-间冰期旋回性，主要以轨道尺度强迫为主导，包括100 ka周期和岁差周期（23/19 ka）。值得注意的是，行波t的岁差信号强于海温。这些轨道尺度的变化反映了通过海平面控制的印尼通流（ITF）动力学和进动驱动的大气环流对ETIO热传输的调制。TWT响应的放大是由itf介导的温跃层平流和日照诱导的垂直混合的共同作用引起的，它们共同调节了上层海洋热量的再分布。400 ka前后海温和TWT （ΔT）梯度的显著变化与MBE一致，表明上层海洋热结构的重大重组，可能是由冰川上升海平面波动和岁差引起的风系统变化驱动的。我们的发现强调了100 ka周期和岁差对ETIO上层海洋热演化的耦合强迫，并为轨道尺度的热再分布和热带海洋-气候相互作用提供了重要的见解。

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引用次数: 0