Palaeogeography, Palaeoclimatology, Palaeoecology最新文献

{"title":"Shifting patterns in tropical lake phytoplankton communities coinciding with anthropogenic nutrient and pollutant trends","authors":"Dongna Yan ,&nbsp;Yongming Han ,&nbsp;Patrick Rioual ,&nbsp;Jianghu Lan ,&nbsp;Sifan Zan ,&nbsp;Yalan Tang ,&nbsp;Huijia Zhang ,&nbsp;Meiling Guo ,&nbsp;Eric Capo","doi":"10.1016/j.palaeo.2026.113623","DOIUrl":"10.1016/j.palaeo.2026.113623","url":null,"abstract":"<div><div>Natural- and human-induced environmental changes lead to structure shifts in phytoplankton communities, impacting the resilience, functioning, and ecosystem services of lakes. Given the scarcity of long-term monitoring data, particularly in the tropical region, our understanding of phytoplankton communities (cyanobacteria and eukaryotic micro-algae) and their triggering factors remains limited over decadal scales. We determined whether shifts in phytoplankton community within Huguangyan Maar Lake, a tropical lake, are linked to climate warming and assessed whether the observed changes resemble those documented in temperate or arctic regions. We applied 23S rRNA gene metabarcoding to 43 sediment samples covering the past ∼140 years, and explored how the phytoplankton community respond to multiple environmental stresses. Phytoplankton diversity exhibited a marked increase beginning in the 1940s, followed by a distinct decline in the 1980s. Notably, a significant shift in community composition emerged toward the late 1980s, characterized by a rise in the relative abundance of diatoms (Aulacoseiraceae) and a concurrent decrease in rhodophytes (Bangiaceae) and cyanobacteria (Synechococcaceae). This pattern contrasted sharply with trends observed in other lakes, where cyanobacteria have maintained dominance in recent decades.Through integrated application of Mantel tests and random forest multivariate modeling, nutrient loading emerged as the predominant driver of community restructuring outweighing climatic factors. Concurrently, anthropogenic combustion signatures, such as polycyclic aromatic hydrocarbons, demonstrated significant covariance with phytoplankton assemblage reconstructing. This study highlights the dual impact of anthropogenic nutrients input and pollutants on phytoplankton communities in tropical lakes and provides important implication for future pollution and nutrient control.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"688 ","pages":"Article 113623"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multi-system geochronometer constraints on thermo-tectonic evolution of the Qiangtang Terrane, central Tibetan Plateau: Comment","authors":"Xiao-Long Song ,&nbsp;Ru-Ye Tian ,&nbsp;Kang-Yu Li","doi":"10.1016/j.palaeo.2026.113582","DOIUrl":"10.1016/j.palaeo.2026.113582","url":null,"abstract":"<div><div>The elevation of the Tibetan Plateau constitutes a revolutionary event in Earth's history, but the chronologic evolution and mechanistic drivers of plateau formation persist as subjects of intense contention. Recently, Lei et al. (2026) proposed that the Tibetan Plateau underwent pulse-like growth and that the rapid elevation of the Qiangtang block during the 120–90 Ma due to the Lhasa–Qiangtang continental collision. However, the extensive literature records of Cretaceous marine deposition over the Qiangtang block does not support its rapid elevation during 120–90 Ma and studies reveal that the subduction of the Meso- and Neo-Tethys oceanic lithospheres could have played a critical role in the initial elevation of the Qiangtang and Lhasa blocks prior to the Cenozoic Indo–Asian collision. An insufficient incorporation of regional sedimentary, structural and tectonic data under over-reliance on limited thermochronological data has seriously undermined the soundness and reliability of Lei et al.'s work.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"688 ","pages":"Article 113582"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Provenance transition between the Xiamaling and Changlongshan formations in the North China Craton and its paleogeographic implications","authors":"Zhongyu Meng ,&nbsp;Bangfang Ren ,&nbsp;Jian Tian ,&nbsp;Wenchao Niu ,&nbsp;Weitong Li ,&nbsp;Lixin Sun","doi":"10.1016/j.palaeo.2026.113635","DOIUrl":"10.1016/j.palaeo.2026.113635","url":null,"abstract":"<div><div>The Meso-Neoproterozoic strata in the North China Craton provide significant insights into the major Precambrian geological events and the paleogeographic reconstruction. This study investigates the stratigraphy, sedimentology, and provenance analysis of the Xiamaling and Changlongshan formations in the Yanliao Rift Basin. We reveal significant provenance variations and their correlations with regional tectonic events, thereby reconstructing the paleogeographic evolution. The Xiamaling Formation is dominated by shelfal shales interbedded with siltstones and sandstones, whereas the Changlongshan Formation consists of coastal quartzose sandstones. The two formations are in unconformable contact, marked by an abrupt change in sedimentary facies that reflects a change in the regional tectonic setting. Sandstones of the Xiamaling Formation contain abundant felsic volcanic rock fragments, and detrital zircon U<img>Pb age spectra display bimodal peaks in the Paleoproterozoic (∼1.8 Ga) and late Paleoproterozoic–early Mesoproterozoic (∼1.6 Ga), with ε_Hf(t) values ranging from −8.6 to +2.5, and − 8.7 to +8.1, respectively. By contrast, Sandstones from the Changlongshan Formation are quartz-dominated and show a single peak of late Neoarchean–early Paleoproterozoic (∼2.5 Ga), and yielded ε_Hf(t) values between − 3.4 and + 5.5. The ∼2.5 Ga zircon ages correspond to continental crustal growth and initial cratonisation. The ∼1.8 Ga peak reflects the collisional amalgamation of the eastern and western blocks of the NCC, forming a unified crystalline basement. The ∼1.6 Ga peak represents magmatic activity in an extensional setting. The paleogeographic evolution of the Yanliao Rift Basin can be reconstructed into three stages: Intracontinental extension (∼1.40–1.32 Ga), tectonic uplift (∼1.32–1.00 Ga), and widespread marine transgression (∼1.00–? Ga).</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"688 ","pages":"Article 113635"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Hirnantian-Rhuddanian succession in East Central United States: New implications for latest Ordovician to early Silurian sea level","authors":"Cole F. Farnam ,&nbsp;Carlton E. Brett ,&nbsp;Lincoln Shoemaker ,&nbsp;Jisuo Jin ,&nbsp;Robert J. Elias ,&nbsp;Christopher B.T. Waid","doi":"10.1016/j.palaeo.2026.113548","DOIUrl":"10.1016/j.palaeo.2026.113548","url":null,"abstract":"<div><div>A detailed understanding of the Late Ordovician to early Silurian glaciations and Hirnantian mass extinctions requires high resolution pattern and timing of sea level and climatic events. The record is particularly poorly known in the eastern USA, which was previously assumed to lack Hirnantian strata. Synthesis of new and previously reported biostratigraphic evidence and carbon isotope chemostratigraphy indicates that thin but widespread, fossiliferous upper Hirnantian strata are preserved in southern Ohio and southeastern Indiana. Elevated values of δ¹³C_carb, within and just beneath strata of the <em>Ozarkodina hassi</em> Zone, in siltstones and carbonates of the lower Whippoorwill Formation (new, herein) of the Cincinnati Arch in Ohio and Indiana, indicate the signature of the upper part of the Hirnantian isotopic carbon excursion (HICE). The presence of conodonts of the <em>O. hassi</em> Zone and brachiopods, corals, and a large dalmanitid trilobite belonging to the globally recognized Edgewood-Cathay fauna strongly supports a latest Hirnantian age for the Whippoorwill Formation. Sequence stratigraphy of the Whippoorwill Formation and the immediately overlying interval allowed for recognition of two thin (possibly 4th order) sequences in the Ohio and Indiana region (Hirnantian-2A (H2A), Centerville Member, and Hirnantian-2B (H2B), Belfast Member). The older Hirnantian (H1) sequence is absent in the greater Cincinnati region and probably truncated beneath the composite H2 or Cherokee Unconformity. Locally, the H2A and H2B sequences are truncated or completely removed beneath the higher Rhuddanian S1A erosion surface (base Brassfield Formation). In turn, the highly irregular lower Aeronian S2B erosion surface (base Oldham) can also locally cut deeply through lower Silurian, Hirnantian, and even upper Katian strata. Correlation of these sequences and their bounding unconformities across eastern North America reveals widespread sequences probably controlled by glacioeustasy during the latest Hirnantian and Rhuddanian.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"688 ","pages":"Article 113548"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146122670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A 2000-year paleofire record from the Tashkurgan Wetland (Pamir Plateau, China): Implications for the impact of Silk Road human activities","authors":"Xiaoxiao Liu ,&nbsp;Yun Zhang ,&nbsp;Yanhong Zhou ,&nbsp;Zhaochen Kong","doi":"10.1016/j.palaeo.2026.113612","DOIUrl":"10.1016/j.palaeo.2026.113612","url":null,"abstract":"<div><div>Reconstructing the paleofire history along the Silk Road enhances our understanding of the complex interplay between natural processes and human activities, and provides a critical perspective on the long-term ecological and environmental evolution of the region. This study conducts a multi-proxy analysis of a sedimentary profile from the Zoroastrian wetland (STCN) on the Pamir Plateau, China, integrating fossil pollen, magnetic susceptibility, and microscopic charcoal records to examine paleofire patterns and anthropogenic influence over the past two millennia. Results indicate that paleofire activity was relatively low from approximately 1900 to 1300 years ago. Beginning around 1300 cal a BP, however, a rise in synanthropic plant pollen occurred alongside increased concentrations of macro-charcoal particles (&gt;125 μm) and higher magnetic susceptibility. These shifts correlated with the development of the Western Regions during the Tang Dynasty and the spread of Zoroastrian fire-worship practices. Between 670 and 540 cal aBP (corresponding to the Yuan-Ming period), secondary peaks in macro-charcoal concentration and magnetic susceptibility, alongside a rise in synanthropic plant pollen and low large Poaceae (&gt;45 μm) content, coincided with agricultural and military activities under the Chagatai Khanate. Since 140 cal a BP, the concentrations of macro-charcoal and the abundance of large Poaceae and synanthropic plant pollen have reached their highest recorded levels, likely driven by population growth, intensified agricultural development, and recurrent warfare. Significant correlations among large Poaceae, <em>Taraxacum</em> pollen, and macro-charcoal particles suggest fire regimes linked to the burning of agricultural crops or anthropogenic weeds, further underscoring the role of human activity. Multi-proxy evidences indicate that human activities along the Silk Road, such as agricultural practices, ritual fire use, and military conflicts, were important factors driving paleofire activity in the region. Particularly during the Yuan–Ming period and the Qing Dynasty, the intensity of human activities showed a synchronous increase with fire frequency, macro-charcoal particle concentrations, pollen content of anthropogenic plants, and magnetic susceptibility values. This research reveals the complex interactions within the human–fire–vegetation system along the Silk Road, providing important insights into the long-term responses of arid ecosystems to human activities.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"688 ","pages":"Article 113612"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Constraints of paleoenvironment on selenium enrichment of the Ediacaran-Cambrian transition period Lujiaping Group in the North Daba Mountains, China","authors":"Sujiao Yang ,&nbsp;Shixi Zhang ,&nbsp;Yingjie Luo ,&nbsp;Jiulong Cheng ,&nbsp;Kunli Luo","doi":"10.1016/j.palaeo.2026.113637","DOIUrl":"10.1016/j.palaeo.2026.113637","url":null,"abstract":"<div><div>The Lujiaping Group (LG), a diachronous unit spanning the Ediacaran-Cambrian transition period in the North Daba Mountains, China, exhibits notable selenium (Se) enrichment. However, the distribution patterns and enrichment mechanisms remain poorly understood. In this study, we analyzed the elemental content and lithology of 61 rock samples from the LG named section in Ziyang County. The Se concentrations ranged from 0 ∼ 147.86 μg/g, with an average of 16.31 μg/g. The LG was subdivided into 5 Formations (Doushantuo Formation (DST), Dengying Formation (DY), Huoshiwan Formation (HSW), Baihe Formation (BH), Shanpingshang Formation (SPS)) from bottom to top, all showing Se enrichment with average enrichment factor (EF=content/upper continental crust (UCC))&gt;2. The BH of the Terreneuvian of the Cambrian showed the highest Se enrichment (mean EF=663.56), while the upper part of the SPS of the Series 2 of the Cambrian showed the lowest Se enrichment (mean EF=3.45). Geochemical and petrographic characteristics suggest that hydrothermal influence was most pronounced in the DST to the lower part of the HSW, while the upper part of the HSW to the SPS received more input from terrestrial sources, and the upper part of the HSW to the lower part of the SPS received more from organism sources. Additionally, paleoenvironmental and paleoclimatic factors such as alternating anoxic-euxinic and suboxic conditions, high primary productivity, intermittent upwelling, and a warm, moist climate may have further promoted Se enrichment.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"688 ","pages":"Article 113637"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Speciation patterns of elements Cl and Br in marine sediments and their significant as salinity proxies","authors":"Shiwen Zheng ,&nbsp;Dejiang Fan ,&nbsp;Xueshi Sun ,&nbsp;Lisha Hu ,&nbsp;Yulong Xue ,&nbsp;Judong Mao ,&nbsp;Peng Cheng ,&nbsp;Xiaolin Ren ,&nbsp;Jian Wang","doi":"10.1016/j.palaeo.2026.113621","DOIUrl":"10.1016/j.palaeo.2026.113621","url":null,"abstract":"<div><div>Salinity is a fundamental hydrochemical parameter of marine environments, yet the reconstruction of paleosalinity remains one of the most challenging issues in paleoceanographic research field. To investigate the potential of conservative elements (Cl, Br) as proxies for seawater salinity variations, this study systematically analyzed the surface sediments collected across the Eastern China marginal seas, where pronounced salinity gradients exist. Through comprehensive examination of Cl and Br speciation mechanisms in sediments, we established quantitative relationships between these halogens and seawater salinity. The results indicated that dissolved Cl and Br dominate their total sedimentary inventories, accounting for 90.27% and 86.14% respectively, while non-dissolved fractions consistently represent &lt;15% of total content. The non-dissolved Cl appears primarily associated with terrigenous silicate minerals, showing stable concentration patterns, whereas non-dissolved Br predominantly occurs in organic matter with clear source-dependent correlations. Significantly, in sediments of the Eastern China marginal seas, dissolved Cl demonstrates an exponential correlation with bottom water salinity. Particularly in brackich water regimes (salinity &lt;30.4 psu), both dissolved Cl and dissolved Br exhibit strong linear relationships with bottom water salinity, enabling quantitative paleosalinity reconstruction in estuarine environments. This research establishes a novel methodological framework for paleosalinity investigations and provides crucial constraints for interpreting paleo-marine environments with sedimentary geochemistry proxies.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"688 ","pages":"Article 113621"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Eastern Brazil hydroclimate weakening linked to stronger AMOC during MIS 16–13","authors":"B. Gomes ,&nbsp;I.M. Venancio ,&nbsp;J.M. Ballalai ,&nbsp;T.S. Figueiredo ,&nbsp;A.G. Almeida ,&nbsp;A.L.S. Albuquerque","doi":"10.1016/j.palaeo.2026.113622","DOIUrl":"10.1016/j.palaeo.2026.113622","url":null,"abstract":"<div><div>Several paleoclimate studies focus on the impacts of changes in Atlantic Meridional Overturning Circulation (AMOC) on the dynamics of the South American Monsoon System (SAMS) on millennial timescales; however, they lack interpretations on longer timescales throughout the Quaternary. Here, we present a sediment core covering the last 1 million years collected in the tropical region of the eastern Brazilian margin near the São Francisco River mouth. We used the ln(Si/Al) as hydroclimate proxy, interpreting as changes in the SAMS activity, and also δ¹³C of benthic foraminifera to track associated changes on AMOC deep-water circulation. We observed substantial changes between 700 and 400 ka, marked by the weakening of the SAMS simultaneously with increasing long-term trend of δ¹³C, suggesting a coupled ocean-atmosphere changes across this period. We infer that the observed increase in ventilation is a response to a stronger AMOC, which leads to a global northward migration of the Intertropical Convergence Zone (ITCZ), resulting in a decrease in SAMS intensity. Thus, our data offer insights into long-term coupled responses between the oceanic and atmospheric systems in the tropical realm during the Quaternary.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"688 ","pages":"Article 113622"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantitative study on the cave environmental factors for the fractionation of stable oxygen isotopes during the deposition of speleothem","authors":"Yue Jin ,&nbsp;Chun-Jie Wang ,&nbsp;Jian Zhang ,&nbsp;Wen-Jun Sun ,&nbsp;Chao-Jun Chen ,&nbsp;Yao Wu ,&nbsp;Hua-Yan Li ,&nbsp;Yue-Hua Xiang ,&nbsp;Yue-Yuan Lin ,&nbsp;Xin-Rui Ye ,&nbsp;Xin-Yan Li ,&nbsp;Zhong-Lin Deng ,&nbsp;Min Zhao ,&nbsp;Li-Juan Sha ,&nbsp;Ting-Yong Li ,&nbsp;Jun-Yun Li","doi":"10.1016/j.palaeo.2026.113616","DOIUrl":"10.1016/j.palaeo.2026.113616","url":null,"abstract":"<div><div>The speleothem δ¹⁸O record is an important archive for reconstructing paleoclimate changes. However, the complex interaction between environmental factors and kinetic fractionation processes poses challenges in interpreting paleoclimatic information from δ¹⁸O records in speleothems. Cave monitoring has been conducted during 2014–2023 in Furong Cave, southwest China, including the δ¹⁸O values and drip intervals of drip water, cave air temperature, partial pressure of carbon dioxide (<em>p</em>CO₂), and relative humidity (RH). The monitoring data are combined with the ISOLUTION model to explore the main controlling factors on δ¹⁸O during the process of calcite deposition. The results show that when the drip interval increases from 0 to 500 s, the δ¹⁸O values of speleothem increase rapidly by approximately 0.4‰. Based on the rigorous quantitative analysis, cave air temperature is established as one of the primary controlling factors on the δ¹⁸O values. The slope of the linear relationship between cave air temperature and the δ¹⁸O values of speleothem is −0.21‰/°C. However, the effects of cave <em>p</em>CO₂ and RH on the δ¹⁸O values of speleothem can be ignored in the cave systems with poor ventilation conditions. Based on this study, the influences of temperature sensitivity coefficients and drip interval thresholds on the stable oxygen isotope fractionation during the speleothem deposition which will assist in quantitative reconstruction of past temperature and precipitation from speleothem δ¹⁸O records.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"688 ","pages":"Article 113616"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Millennial-scale hydroclimate variability of the Asian monsoon during MIS 9 from stalagmite records","authors":"Sinan Wang ,&nbsp;Xunlin Yang ,&nbsp;Hai Cheng ,&nbsp;Wenming Zhou ,&nbsp;Guofeng Li ,&nbsp;Wanli Xiang ,&nbsp;Rui Zhang ,&nbsp;R. Lawrence Edwards","doi":"10.1016/j.palaeo.2026.113606","DOIUrl":"10.1016/j.palaeo.2026.113606","url":null,"abstract":"<div><div>The evolution and millennial-scale variability of the Asian Summer Monsoon (ASM) during Marine Isotope Stage 9 (MIS 9) remain insufficiently constrained due to the limited availability of high-resolution archives. Here, we present a reconstruction of ASM dynamics between 340 and 285 ka BP, based on high-resolution (∼68-year) stalagmite δ¹⁸O records from Jinfo Cave, southwestern China. Results demonstrate that orbital-scale ASM variability was primarily modulated by Northern Hemisphere summer insolation, allowing subdivision into five substages: MIS 9e, MIS 9d, MIS 9c, MIS 9b, and MIS 9a. Synchronous comparisons with other speleothem datasets corroborate a spatial pattern characterized by pronounced variability in southwestern China and relative stability in the southeast. Within MIS 9c, three distinct millennial-scale weak monsoon events were identified, indicating substantial hydroclimate instability during interglacial conditions. Spectral analyses reveal dominant ∼2–4 kyr periodicities, analogous to Dansgaard–Oeschger (D<img>O) events of the last glacial period, likely linked to Atlantic Meridional Overturning Circulation (AMOC) instability under enhanced insolation forcing. Comparisons with MIS 5–4 highlight convergent responses in insolation-driven forcing, critical ice-volume thresholds, and monsoon evolution, suggesting an intrinsic propensity of the climate system toward quasi-cyclic oscillations.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"688 ","pages":"Article 113606"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}