Global and Planetary Change最新文献

{"title":"Diatom taphocoenoses as a potential sink of mercury in the brackish water basin","authors":"Dominika Hetko, Bożena Graca, Małgorzata Witak, Patrycja Jernas, Magdalena Bełdowska","doi":"10.1016/j.gloplacha.2025.105006","DOIUrl":"https://doi.org/10.1016/j.gloplacha.2025.105006","url":null,"abstract":"Diatoms are microalgae that are employed as bioindicators for metal pollution. Their ability to accumulate metals, in addition to their role within the food web as primary producers, have been proposed to contribute to the bioaccumulation and biomagnification of pollutants such as mercury. The present study employs statistical analysis to identify diatom species that may exert a significant influence on the mercury cycle within the brackish, eutrophicated Outer Puck Bay. Concentrations of total mercury and its five fractions are analyzed using the thermodesorption method in surface sediments from the study area. The principal component analysis indicates that among the 175 diatom species identified in the sediments, planktic <ce:italic>Coscinodiscus asteromphalus</ce:italic>, <ce:italic>Cyclotella choctawhatcheeana, Thalassiosira levanderi,</ce:italic> and benthic <ce:italic>Stephanocyclus meneghinianus</ce:italic> can be associated with elevated sediment Hg concentrations. Variability in their relative abundance is proposed to be responsible for over 60 % of the variation in sediment Hg concentration. High concentrations of labile mercury fractions that can potentially biomagnify correlate with a high content of diatom valves preserved in the surface sediments. Principal component analysis and cluster analysis indicate that the planktic <ce:italic>C. asteromphalus</ce:italic> and <ce:italic>T. levanderi</ce:italic> are associated with elevated concentrations of organically bound Hg. Planktic <ce:italic>Cyclostephanos dubius,</ce:italic> on the other hand, is associated with elevated concentrations of loosely bound Hg. This work suggests that planktic diatoms enhance the flux of labile Hg from the water column to sediments. If the dominance of diatom flora in the brackish environment persists, the role of these microalgae in the Hg cycle will increase significantly.","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"12 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144897865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exploring the feedbacks of vegetation and carbon cycle processes to climate changes under thermal events in Northeast China by reconstructing Eocene climate and atmospheric CO2 levels","authors":"Jianan Kang ,&nbsp;Qingtao Meng ,&nbsp;Fei Hu ,&nbsp;Chenxiang Li ,&nbsp;Penglin Zhang ,&nbsp;Yini Wang ,&nbsp;Lin Ma ,&nbsp;Baoyi Li","doi":"10.1016/j.gloplacha.2025.105009","DOIUrl":"10.1016/j.gloplacha.2025.105009","url":null,"abstract":"<div><div>Paleoclimate fluctuations recorded in lake sediments provide critical evidence for global carbon cycle disturbances. The Eocene epoch marks a pivotal period in Earth's transition to modern climate patterns and vegetation, offering insights into future global warming and ecological responses. Lacustrine deposits in Northeast China preserve important “deep-time” paleoclimatic information, providing a terrestrial perspective for studying Eocene climate change. This study reconstructed Eocene vegetation dynamics, climate parameters and CO₂ levels of the Yilan Basin in Northeast China through palynological analysis, the Coexistence Approach (CA) method, the Climate Amplitude Method (CAM) and δ¹³C_wood records. An Eocene climate evolution model for Northeast China was established, addressing climate sensitivity, oceanic-lacustrine thermal event correlations, vegetation responses, and post-thermal event climate regulation mechanisms against the backdrop of extreme hot-cold alternations during the Eocene. Our study fills the gap in understanding the Eocene climate of Heilongjiang Province. By comparing the Yilan Basin's climate reconstruction results with those from other regions, as well as CO₂ reconstruction data with global Eocene atmospheric CO₂ trends, we elucidated the climate evolution dynamics of Northeast China throughout the entire Eocene. The Yilan Basin featured a typical Ca (Humid subtropical) climate with significant seasonal variations, with a MAT of 11.6 ± 0.1–21.3 ± 0.6 °C and MAP of 652 ± 40–1823 ± 99 mm. Thermal events (ETM2, ETM3) and warmer intervals (EECO, MECO) triggered significant negative carbon isotope excursions, with these continental responses lagging behind their marine counterparts. Regional temperature and precipitation associated with thermal events increased notably, and vegetation and CO₂ feedbacks to thermal and cooling events during the Eocene were consistent and coordinated. In post-thermal event climate regulation, silicate weathering and organic carbon burial played crucial roles, exerting negative feedbacks on CO₂-driven warming.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 105009"},"PeriodicalIF":4.0,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144771644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 1000-year extreme flooding record from NE Asia reveals contrasting roles of climate aridification and human activities in driving basin erosion and sedimentation","authors":"Shuang Sun, Xianliang Dong, Yunfeng Nie, Yang Li, Liya Zhu, Xianyong Cao, Hongwei Ma, Yan Li, Hong Wang, Ke Hu, Yin Lu","doi":"10.1016/j.gloplacha.2025.104994","DOIUrl":"https://doi.org/10.1016/j.gloplacha.2025.104994","url":null,"abstract":"Understanding the severe flood erosion and subsequent sedimentation in arid mountainous regions is crucial for assessing future flood risks under the pressure of global warming and human activities. It has long been hypothesized that a shift toward a more arid climate in an arid environment could enhance flood erosion despite the decreased discharge in rivers. However, the scarcity of long and reliable flood records makes testing this hypothesis difficult, thus limiting understanding of flood erosion during climate aridification. Here, we reconstruct a 1000-year-long extreme flooding record by exploring original Chinese historical archives and by analyzing sediment cores from the semi-arid mountainous catchment-Daling River estuary, NE Asia, based on the observation that instrumental floods normally cause coarse particle enrichment in the estuary. Our data reveal that on the centennial scale, extreme flooding mainly coincided with periods of climate aridification. The frequent rainstorms in this high variable topography catchment, coupled with reduced vegetation coverage as the climate shifts toward a more arid condition, have primarily contributed to the heightened flood erosion. Additionally, our record highlights the significant impact of accelerated reservoir construction and vegetation restoration in the river catchment since 1960 CE. These human activities have led to a noticeable reduction in coarse particle contents and sediment flux reaching the estuary which supports the previous viewpoints that human activities in Asia have greatly decreased river load entering the coastal oceans.","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"15 1","pages":"104994"},"PeriodicalIF":3.9,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144897930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reply to comment: Monsoon variability and high latitude climate signals in the Central Mediterranean at the Pliocene–Pleistocene transition: The Gelasian stratotype section (Monte San Nicola, Sicily) [Global and Planetary Change, 249, 104788]","authors":"Marina Addante ,&nbsp;Timothy D. Herbert ,&nbsp;Angela Girone ,&nbsp;Antonio Caruso ,&nbsp;Maria Marino ,&nbsp;Giovanna Scopelliti ,&nbsp;Stefano Fasone ,&nbsp;Patrizia Maiorano","doi":"10.1016/j.gloplacha.2025.104995","DOIUrl":"10.1016/j.gloplacha.2025.104995","url":null,"abstract":"<div><div>In their recent comment, Zanola et al. (2025) raise concerns regarding the stratigraphic integrity and correlation potential of the Monte San Nicola type section (MSN_t-s) for the Gelasian Stage described in Addante et al. (2025). In this Reply, we provide a point-by-point response, demonstrating that the MSN_t-s stands as a stratigraphically continuous and robust global reference section, as supported by multi-proxy datasets including high-resolution stable isotopes, calcareous plankton, alkenone sea surface temperature and C₃₇ records, geochemical and mineralogical analyses, not all of which are available for the Mandorlo section, 400 m to the west. We clarify misconceptions about sapropel identification, age model construction, tectonic disturbance, and the calcareous nannofossil signal. We reaffirm the strong alignment of the MSN_t-s record with regional and global climatostratigraphic archives.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 104995"},"PeriodicalIF":4.0,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144749557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Disentangling the multi-phase alteration of fossil charcoals: A cautionary tale from the Isle of Mull, Scotland","authors":"Thomas Theurer,&nbsp;David Jolley,&nbsp;David K. Muirhead,&nbsp;Dmitri Mauquoy,&nbsp;Malcolm Hole","doi":"10.1016/j.gloplacha.2025.104990","DOIUrl":"10.1016/j.gloplacha.2025.104990","url":null,"abstract":"<div><div>Fossil charcoal material offers quantitative insights into prehistoric fire behaviour and ecosystem disturbance through applications of geothermometry. Such methods rely on the analysis of chemical changes within the carbonaceous microstructure of charcoal – corresponding to temperature of formation, or ‘pyrolysis intensity’. Of the techniques commonly applied, Raman spectroscopy has offered insights into the relationships between thermal, structural, and chemical aspects of organic carbon under thermal maturation. This includes broader considerations of energy flux in fire events. The reliance upon material chemistry, however, suggests a susceptibility to additional chemical and thermal alterations that have otherwise been underexplored. Our Raman spectroscopic investigation of palaeocharcoal from the Isle of Mull (Scotland), entrained within a lahar deposit that has undergone intrusion, reveals geothermometric discrepancies and spectral features consistent with microstructural modification. These include a pronounced blueshift of the G-band, carbonyl bonding, prominent defect functions, and a significant reduction in G-band width. The disparity in presentation, however, suggests a more complex origin. We attribute these spectral features to a co-occurrence of oxidative weathering and progressive maturation during intrusion emplacement. Considerable questions are therefore raised as to the accuracy of existing studies in organic carbon geothermometry, particularly in the study of palaeofire. This potentially limits our understanding of fire intensification under climatic warming – past, present, and future.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 104990"},"PeriodicalIF":4.0,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144721151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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-proxy records of wildfires and climate-vegetation-wildfire mechanisms during the Middle Jurassic of the Yili Basin, Northwest China","authors":"Jiamin Zhou ,&nbsp;Longyi Shao ,&nbsp;Timothy P. Jones ,&nbsp;Yangyang Huang ,&nbsp;Mengran Chen ,&nbsp;Jing Lu ,&nbsp;Jason Hilton","doi":"10.1016/j.gloplacha.2025.104991","DOIUrl":"10.1016/j.gloplacha.2025.104991","url":null,"abstract":"<div><div>Wildfires are an important source of disturbances in the Earth's system and are of great significance for understanding the interactions between environmental, atmospheric and vegetation changes in deep time. The Early-Middle Jurassic was a fire-prone stratigraphic interval, and the Yili Basin has Middle Jurassic coals that contain high-quality information about palaeowildfires. In this study, a multi-proxy study was undertaken to analyze coal macerals, inertinite reflectance, and polycyclic aromatic hydrocarbons (PAHs) in coal and mudstone samples from the Aalenian coal-forming Yili Basin to characterize palaeowildfire events. In addition, normal alkanes (<em>n</em>-alkanes) were used as biomarkers of alterations in coal-forming vegetation, and natural char was used as complementary coal petrological evidence for palaeowildfires. The presence of high levels of inertinite, high natural char contents, and high abundances of potentially combustion-derived PAHs demonstrate that multiple, widespread wildfires occurred during the Aalenian in the Yili Basin. Inertinite reflectance values ranging from 0.65 % to 3.81 % show that palaeowildfires, based on modern combustion experiments, were dominated by lower temperature ground fires, with a small proportion of surface fires and almost no high temperature crown fires. It is believed that the total amount of PAHs can be used as good evidence of palaeowildfires, but the ratios of high to low ring PAHs in the molecules are not necessarily indicative of combustion temperatures of palaeowildfires due to the high solubility of low-ring PAHs. Based on our findings and integration with previous studies, we elucidate the likely mechanisms of climate-vegetation-wildfire feedback.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 104991"},"PeriodicalIF":4.0,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144721153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sea level budget in the China Seas over 2005–2023","authors":"Keke Wang ,&nbsp;Changlin Chen ,&nbsp;Zhizu Wang ,&nbsp;Juncheng Zuo","doi":"10.1016/j.gloplacha.2025.104992","DOIUrl":"10.1016/j.gloplacha.2025.104992","url":null,"abstract":"<div><div>The observed fluctuations in regional sea levels on seasonal to decadal timescales can be budgeted as the sum of a manometric (mass-related) component and a steric (density-related) component. We assess the sea level budget (SLB) of the China Seas (the Bohai Sea, Yellow Sea, East China Sea, and South China Sea) for the period 2005–2023, utilizing datasets from satellite observations and ocean objective analysis. Our results demonstrate that the sum of manometric and steric components is generally consistent with the observed sea level variations across seasonal to decadal timescales, indicating a preliminary closure of SLB in the China Seas. On the seasonal timescale, the manometric component dominates sea level change on the continental shelf of the South China Sea, with peaks in winter (December), while the steric component plays a more significant role in other basins, peaking in autumn (September). On the interannual to decadal timescales, the manometric component predominates in influencing sea level change in the shallow seas, while the steric component plays a more significant role in the South China Sea deep basin. Further analysis suggests that the observed positive long-term trend of manometric sea level over shallow seas comes not only from the melting of land ice, but also from the global-warming-induced seawater redistribution from the open ocean to the shallow areas.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 104992"},"PeriodicalIF":4.0,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144721155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sources of rare earth elements and yttrium in late Devonian svanbergite from the Shifang phosphorite deposit","authors":"Yuhan Ma ,&nbsp;Haifeng Fan ,&nbsp;Danish Khan ,&nbsp;Fang Zhang ,&nbsp;Hongjie Zhang ,&nbsp;Jianfeng Gao ,&nbsp;Hanjie Wen ,&nbsp;Liang He ,&nbsp;Yuan Deng","doi":"10.1016/j.gloplacha.2025.104987","DOIUrl":"10.1016/j.gloplacha.2025.104987","url":null,"abstract":"<div><div>The Devonian Shifang phosphorite deposit in the South China Craton (SCC) contains a significant amount of aluminum phosphate-sulphate (APS) minerals, particularly in svanbergite, with rare earth elements and yttrium (REY) concentrations ranging from 1060 to 3257 ppm, with an average of 2259 ppm. Notably, the svanbergite ore body within the Shifang phosphorite deposit exhibits higher REY concentrations than the underlying phosphorite ore body. Despite this, the REY sources in the svanbergite from this unique deposit remain ambiguous. In this study, we carried out major and trace element analysis, as well as whole rock Sr and Nd isotopes analysis, on svanbergite from Shifang and phosphorite from Qingping. Furthermore, we also present Nd isotopic data from granodiorite samples collected from Dashuizha anticline. Additionally, U<img>Pb dating and trace element analysis of detrital zircons hosted within Shifang svanbergite were performed to better elucidate the material sources of REY in the svanbergite. Our results indicate that REY enrichment in the Shifang svanbergite was primarily driven by primary marine sedimentation and weathering. Major and trace element data, especially Y/Ho ratios and REY concentrations, along with ⁸⁷Sr/⁸⁶Sr ratios, suggest that both seawater and terrestrial sources contributed to the REY enrichment. The εNd(t) values and T_2DM ages of Shifang svanbergite align with certain Neoproterozoic granites (Tonian granite, 750–875 Ma) and Cambrian granites (498–536 Ma) in the SCC continental crust. Combined with the trace element analysis as well as zircon U<img>Pb ages of the svanbergite, we conclude that these Cambrian and Tonian granites were likely significant contributors to the REY in the Shifang svanbergite. Furthermore, the Cambrian Qingping phosphorite deposit may have also contributed to the REY content in the Shifang svanbergite.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"253 ","pages":"Article 104987"},"PeriodicalIF":4.0,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144696872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Timing of mega-lakes in the central-southern Tibetan Plateau constrained by K-feldspar single-grain pIRIR dating of paleo-shorelines","authors":"Hui Zhao ,&nbsp;Shuai Zhang ,&nbsp;Yongwei Sheng ,&nbsp;Zhiyong Yang ,&nbsp;Keqi Wang ,&nbsp;Fahu Chen","doi":"10.1016/j.gloplacha.2025.104989","DOIUrl":"10.1016/j.gloplacha.2025.104989","url":null,"abstract":"<div><div>Lake evolution in the Tibetan Plateau (TP) during the late Quaternary exhibits pronounced spatiotemporal complexity, manifested by mega-lake formations during MIS 5 in the northeastern TP (NETP) versus MIS 3 and early Holocene lake high-stands in the central-southern TP (CSTP). While quartz optically stimulated luminescence (OSL) remains the most widely used dating method for reconstructing paleolake levels across the TP, its reliability at specific lakes has recently been questioned due to the high contribution of medium component and low sensitivity and stability, prompting a critical re-evaluation of paleolake chronologies. Here, we determined the ages of thirteen mega-lakes in the CSTP by dating the highest (or near-highest) paleo-shorelines using both quartz single-aliquot OSL and K-feldspar single-grain (SG) post-infrared infrared stimulated luminescence (pIRIR) techniques. Dimensions and water storage changes of these mega-lakes were reconstructed. Our results indicate that quartz OSL signals exhibit thermal instability, resulting in age underestimations, particularly for samples older than ∼40 ka, potentially explaining previous MIS 3-restricted paleolake chronologies. By contrast, K-feldspar SG-pIRIR dating provided robust age constraints, revealing that the mega-lakes primarily formed during the last deglaciation-early Holocene (17–15 ka and 12–7 ka), while a subset of lakes record MIS 5 mega-lake phases (106.7–97.6 ka and ∼ 70 ka). We hypothesize that enhanced Indian summer monsoon intensity coupled with increased glacial meltwater drove mega-lake formations during MIS 5 and the early Holocene, whereas the last deglacial mega-lakes may reflect meltwater flux variations.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 104989"},"PeriodicalIF":4.0,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144721154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cambrian millennial-scale climate cycles paced by Milanković forcing","authors":"Yifei Zhang ,&nbsp;Qiang Fang ,&nbsp;Huaichun Wu ,&nbsp;Meinan Shi ,&nbsp;Congcong Gai ,&nbsp;Shihong Zhang ,&nbsp;Tianshui Yang ,&nbsp;Haiyan Li ,&nbsp;Christian Zeeden","doi":"10.1016/j.gloplacha.2025.104988","DOIUrl":"10.1016/j.gloplacha.2025.104988","url":null,"abstract":"<div><div>Millennial-scale climate variability is a prominent feature of the late Cenozoic high-resolution climate records and is closely linked to ice sheet dynamics and changes in ocean-atmosphere systems. However, while quasi-cyclic millennial-scale climate proxy variability is observed in much older strata, the origins of these cycles in deep time remain uncertain. To better understand the nature and evolution of millennial-scale cycles close to the equator, high-resolution physical property records of the Global Stratotype Section and Point (GSSP) for the Wuliuan Stage (Middle Cambrian, ∼510 Ma) in South China were utilized to conduct a cyclostratigraphic analysis. An ∼1 Myr-long astronomical time scale across the Stage 4-Wuliuan was developed by astronomical tuning of natural gamma-ray data to the ∼100-kyr short eccentricity cycle. We report semi-precession cycles of 7.9–11.7 kyr, which were associated with the twice passage of a precipitation maximum across the site in the inner tropics, consistent with the paleogeographical location of South China block near the equator. Furthermore, our results suggest that millennial-scale cycles are influenced by obliquity, precession and semi-precession at least in this case. Millennial-scale cycles also can be directly generated by the harmonization between fundamental Milanković cycles. These results describe one of the oldest known geological candidates for sub-Milanković scale climate change modulated by astronomical climate forcing.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"253 ","pages":"Article 104988"},"PeriodicalIF":4.0,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144665076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}