Global and Planetary Change最新文献

{"title":"Sea level fluctuations and silicate weathering dynamics over 450 kyr: Insights from lithium isotopes in South China sea sediments","authors":"Fangbing Li ,&nbsp;Simon V. Hohl ,&nbsp;Marc Weynell ,&nbsp;Shouye Yang ,&nbsp;Enqing Huang ,&nbsp;Fangliang Li","doi":"10.1016/j.gloplacha.2025.105067","DOIUrl":"10.1016/j.gloplacha.2025.105067","url":null,"abstract":"<div><div>Silicate weathering is a key regulator of Earth's long-term carbon cycle and climate. While the influence of climate on weathering intensity is well recognized, the extent of its variability on glacial–interglacial timescales, particularly in low-latitude regions, remains poorly constrained. Here we present lithium (δ⁷Li), strontium (Sr), and neodymium (Nd) isotope data from the clay-sized siliciclastic fraction of core MD 05–2901, recovered around 200 km from the coast of central Vietnam in the South China Sea (SCS), to reconstruct silicate weathering mecanisms over the past 450 kyr. The record spans 12 marine isotope stages, capturing multiple glacial–interglacial cycles. δ⁷Li values of the silicate fraction range from −1.3 ‰ to +0.9 ‰ (2SD = 0.3 ‰) and display systematic glacial–interglacial variability, with negligible influence from grain size or diagenetic alteration. Lower δ⁷Li values (mean = −1.0 ± 0.3 ‰) occur in kaolinite-rich intervals, indicating intensified silicate weathering during glacials, likely linked to enhanced secondary mineral exchange and greater organic matter incorporation. We suggest that sea-level lowstands (∼50 m below interglacial levels) exposed continental shelves, promoting intense chemical weathering. Our results demonstrate that Li isotopes serve as a robust tracer of silicate weathering intensity on orbital timescales, assuming stable sediment provenance, and highlight the role of sea-level fluctuations in modulating weathering processes and secondary mineral formation in shelf environments.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"255 ","pages":"Article 105067"},"PeriodicalIF":4.0,"publicationDate":"2025-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145093916","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 new approach to experimental charcoal analyses: Implications for the Cretaceous and other greenhouse climate intervals","authors":"Matthew R. Galinger ,&nbsp;Richard S. Vachula ,&nbsp;Leslie R. Goertzen ,&nbsp;Curtis J. Hansen ,&nbsp;Thomas M. Cullen","doi":"10.1016/j.gloplacha.2025.105079","DOIUrl":"10.1016/j.gloplacha.2025.105079","url":null,"abstract":"<div><div>Earth's climate has historically oscillated between different states, with greenhouse climate periods offering valuable analogs for future climate projections. The Cretaceous Period, frequently characterized by high atmospheric CO₂ levels and the absence of polar ice caps (among other changes), provides potential insights into potential ecological and environmental responses to anthropogenic climate change. This study presents new experimental data to inform the use of sedimentary charcoal as a paleofire and paleoecological proxy during the Cretaceous, supplementing the limitations of traditional palynological and fossil perspectives. Our experimental analysis includes 23 broadly sampled plant taxa, focusing on charcoal morphological classifications and a novel set of the following morphometric parameters: aspect ratio (L:W), rectangularity, circularity, and feret diameter. We also conducted novel dissections of plant tissue components (e.g., leaf vein, leaf petiole, etc.) to a finer scale than previous studies. Our results reveal significant differences in charcoal morphometrics at the tissue (e.g., leaf, petiole) and component (e.g., vein, blade) levels, challenging the assumption that larger plant tissues produce relatively uniform charcoal particles. This emphasizes the need for refined morphometric techniques that consider plant tissues as an assemblage of their respective components. Our findings provide a nuanced framework that will improve the accuracy of future charcoal-based paleofire and paleoecology studies, particularly in pre-Holocene contexts, aiding predictions of future ecological dynamics under changing climate conditions.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"255 ","pages":"Article 105079"},"PeriodicalIF":4.0,"publicationDate":"2025-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221193","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":"Centennial-scale decline in global fire emissions driven by land use and population growth","authors":"Haixiao Zhang ,&nbsp;Xu Yue ,&nbsp;Bin He ,&nbsp;Jun Zhu ,&nbsp;Chenguang Tian","doi":"10.1016/j.gloplacha.2025.105081","DOIUrl":"10.1016/j.gloplacha.2025.105081","url":null,"abstract":"<div><div>Fires and their carbon emissions have substantial impacts on land surface, climate systems, and air quality. However, long-term datasets with detailed spatiotemporal fire records are limited due to the short duration of satellite observations and uncertainties in process-based models. Here, we employ a data-driven approach that integrates machine learning algorithm (MLA) with outputs from eight fire models to reconstruct fire CO₂ emissions in 1901–2012. Our MLA-based dataset reveals a global decline in fire-emitted CO₂ at −7.45 ± 0.12 Tg C yr⁻² (−0.29 % yr⁻¹), mainly in South America and Africa. Land use change emerges as the primary driver, reducing fire CO₂ emissions by −6.07 ± 0.23 Tg C yr⁻², followed by population growth, which contributes −3.60 ± 0.54 Tg C yr⁻². Population growth typically suppresses fires in agricultural and urban areas but raises fire risks at rainforest edges where deforestation occurs. Although climate change has a limited impact on global fire CO₂ reduction (−0.39 ± 0.19 Tg C yr⁻²), it remains a key driver for boreal fires, strongly influenced by precipitation changes. These findings underscore the need for robust data and informed management to support fire prevention and climate change mitigation efforts.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"255 ","pages":"Article 105081"},"PeriodicalIF":4.0,"publicationDate":"2025-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145093917","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":"Double-plunging structure of the Bond 4 event evidenced in new mid-Holocene stalagmite records from northern China","authors":"Quan Wang ,&nbsp;Yingfang Cui ,&nbsp;Kan Zhao ,&nbsp;Jianshun Chen ,&nbsp;Qingfeng Shao ,&nbsp;Jianghu Lan ,&nbsp;Liangcheng Tan ,&nbsp;Lei Ding ,&nbsp;Hongan Dong ,&nbsp;Lili Dai ,&nbsp;Yongjin Wang","doi":"10.1016/j.gloplacha.2025.105082","DOIUrl":"10.1016/j.gloplacha.2025.105082","url":null,"abstract":"<div><div>The Holocene epoch is characterized by a series of centennial-scale abrupt climate events. However, the temporal framework and internal structure of the Bond 4 event remain poorly constrained owing to the limited availability of precisely dated, high-resolution proxy records. Here, we present multi-proxy (δ¹³C, δ¹⁸O, and Mg/Ca) records from two precisely ²³⁰Th-dated stalagmites (XS4 and XS5) from Xingshan Cave in northern China, spanning the mid-Holocene (∼7.01–5.22 ka BP). Covariations in δ¹⁸O, δ¹³C, and Mg/Ca suggest a coupling between East Asian Summer Monsoon (EASM) intensity (indicated by δ¹⁸O) and hydrological changes (indicated by δ¹³C and Mg/Ca) in our study region, supported by regional paleoclimate comparisons. Our analysis reveals a pronounced double-plunging structure during the Bond 4 event (∼6.21–5.82 ka BP), with two major plunges centered at ∼6.14 ka BP and ∼5.90 ka BP. The new evidence presented here suggests that solar activity paced the timing and structure of the event, while internal variabilities (e.g., Atlantic Multidecadal Oscillation and El Niño–Southern Oscillation) and volcanic eruptions potentially amplified EASM weakening and drought severity. These findings highlight the complex interplay between external and internal forcing in shaping Holocene monsoon variability.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"255 ","pages":"Article 105082"},"PeriodicalIF":4.0,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145093918","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":"Non-uniform responses of small fragilarioid taxa to environmental changes in global mountain lakes during the last century","authors":"Jia Peng ,&nbsp;Runzhou Wang ,&nbsp;Jun He ,&nbsp;Xuejing Long ,&nbsp;Linghan Zeng ,&nbsp;Xu Chen ,&nbsp;Suzanne McGowan","doi":"10.1016/j.gloplacha.2025.105078","DOIUrl":"10.1016/j.gloplacha.2025.105078","url":null,"abstract":"<div><div>Global environmental changes have accelerated the degradation of remote mountain lake ecosystems during the Anthropocene. Small fragilarioid taxa (SFT), a group of benthic diatoms encompassing genera such as <em>Staurosirella</em>, <em>Staurosira</em>, <em>Pseudostaurosira</em>, may respond sensitively to global environmental changes. However, knowledge regarding such SFT responses at the continental scale remains limited. This study explored spatiotemporal changes of SFT in sedimentary records of 78 mountain lakes during the last century. There was a net increasing trend in global-scale SFT abundance since the 20th century, and hence global changes have accelerated diatom flora shifts during recent decades. Generally, SFT increased in high-elevation mountain lakes, but decreased in low-elevation mountain lakes. In high-elevation lakes that are less influenced by human activities, SFT respond more strongly to climate change and anthropogenic disturbances. According to the results of correlation analyses and generalized additive models, climate change and local human activities played a major role in recent changes in SFT in mountain lakes. In terms of spatial distribution, SFT were more dominant in small shallow lakes in comparison with large deep counterparts, and thus their utility as an ecological indicator is likely mediated by lake morphometry. Although accurate identification of SFT to species level is challenging because many SFT appear similar in lateral view, our results highlight that SFT as a group can be a useful bioindicator for tracking past environmental changes in mountain lakes, especially in small shallow lakes at high elevations.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"255 ","pages":"Article 105078"},"PeriodicalIF":4.0,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145093938","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":"Orbital and sea-level controls on long-term sediment deposition in the Amazon Fan","authors":"Gabriel R. Moizinho ,&nbsp;Thiago P. Santos ,&nbsp;Germain Bayon ,&nbsp;Martin Roddaz ,&nbsp;Natalia Vázquez Riveiros ,&nbsp;Marina Rabineau ,&nbsp;Daniel Aslanian ,&nbsp;Victor Carreira ,&nbsp;Elton L. Dantas ,&nbsp;Roberto V. Santos","doi":"10.1016/j.gloplacha.2025.105068","DOIUrl":"10.1016/j.gloplacha.2025.105068","url":null,"abstract":"<div><div>The Amazon Fan, one of the largest deep-sea fans on Earth, is a vital archive of the Amazon Basin's long-term climate and tectonic evolution. However, the factors driving sediment deposition patterns during the Neogene remain poorly understood. Here, we present an astronomical age model for a 4800 m-long sedimentary record (BP-3 well), spanning the past ∼24 million years, a key interval encompassing the Amazon River's evolution into a transcontinental system. Gamma-ray (GR) data reveal strong Milankovitch cyclicity, highlighting the fan's sensitivity to orbital climate variability and enabling correlations with global mean sea level (GMSL). Our analysis shows persistently low sedimentation rates (∼5–13 cm/kyr) during the late Miocene, despite Andean uplift and increased precipitation, likely due to sediment trapping by mega-wetlands in Western Amazonia. A marked increase in sedimentation (∼50 cm/kyr) during the Early Pliocene (5.1–4.8 ± 1.78 Ma) reflects the collapse of these barriers, facilitating sediment transport to the Atlantic despite high GMSL. The GR record also captures the transition from obliquity- to eccentricity-dominated glacial-interglacial cycles during the mid-Pleistocene Transition (∼1.3 Ma). These findings align with GMSL and benthic δ¹⁸O data, supporting a minimal tuning approach and emphasizing the Amazon Fan's sensitivity to global climate changes. Our revised chronology provides a robust framework for understanding the Neogene evolution of the Amazon River and its links to Andean tectonics and climate variability.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"255 ","pages":"Article 105068"},"PeriodicalIF":4.0,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145093937","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":"Biogeochemical nitrogen cycle response to Middle Permian climate warming in Northwest China paleolake","authors":"Xueqi Song ,&nbsp;Ruining Hu ,&nbsp;Wenquan Xie ,&nbsp;Jinqi Xu ,&nbsp;Xin Liu ,&nbsp;Haibo Xu ,&nbsp;Jingqiang Tan ,&nbsp;Thomas J. Algeo","doi":"10.1016/j.gloplacha.2025.105069","DOIUrl":"10.1016/j.gloplacha.2025.105069","url":null,"abstract":"<div><div>The response of nitrogen cycling in lake systems to icehouse-to-greenhouse climate transitions remains essentially uninvestigated, even though similar responses are imminent in modern lakes. Here, we examine the biogeochemical nitrogen cycle in Paleolake Junggar, a saline lacustrine system in the Jimsar Sag (Junggar Basin, NW China) through analysis of elemental, isotopic, and biomarker proxies in the Middle Permian Lucaogou Formation. The study section comprises three depositional intervals (Intervals A, B, and C) based on variations in organic matter abundance and lithofacies associations. Our results document a climatic shift from cold-arid in Interval A (oldest) to warm-humid conditions in Interval C (youngest), promoting terrestrial nutrient influx. Salinity and redox proxies suggest higher salinity and stronger anoxia in Intervals A and C compared to Interval B. Biomarkers show an abundance of halotolerant green algae in Interval A, with increased cyanobacterial inputs in Intervals B<img>C. A decrease in nitrogen isotopic compositions (δ¹⁵N) records a climate-driven reduction in lake water pH, defining three biogeochemical nitrogen cycling stages. Under the initially arid climate conditions of Interval A, anoxic and alkaline conditions were favorable to halotolerant green algae and methanogens, and ammonia volatilization was strong (δ¹⁵N &gt; +10 ‰). Climate warming and increased chemical weathering in Interval B led to cyanobacterial blooms in a nutrient-rich watermass along with incomplete denitrification accompanied by possible biological nitrogen fixation (+8 ‰ &lt; δ¹⁵N &lt; +10 ‰). Following development of a wetter climate in Interval C, the stratified and neutral-pH lake was marked by increased productivity and bottom-water anoxia, facilitating the enrichment of organic matter and triggering a shift to dominance of denitrification (+5 ‰ &lt; δ¹⁵N &lt; +8 ‰). These findings demonstrate that nitrogen isotopes can serve as an effective proxy for climate change in alkaline lakes, especially offering insights into the response of biotic community structures to Middle Permian climate warming.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"255 ","pages":"Article 105069"},"PeriodicalIF":4.0,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145061397","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":"Changes in wildfire season in Alaska and the consequences for ambient fine PM in recent decades","authors":"Emily Gaw ,&nbsp;Nilkamal Jaisawal ,&nbsp;Akinleye Folorunsho ,&nbsp;Shannon Lindsey ,&nbsp;Tianjun Lu ,&nbsp;Yisi Liu ,&nbsp;Meng Wang ,&nbsp;Yang Li","doi":"10.1016/j.gloplacha.2025.105076","DOIUrl":"10.1016/j.gloplacha.2025.105076","url":null,"abstract":"<div><div>Recent studies highlight the role of climate change in creating conditions that are increasingly conducive to wildfire activity across large areas of North America. This trend raises significant concerns about the growing impacts of wildfires on regional air quality. In particular, Alaska is warming at an accelerated rate, making it critical to understand how its wildfire seasons are evolving and how these changes influence fire activity and air quality. Fire seasons mark the period each year when wildfires are most likely to occur, and their length and intensity have important implications for management and mitigation efforts aimed at protecting human health in this vulnerable region. By applying temperature thresholds, we find that Alaska's fire season has lengthened by approximately 13.8 days from the early 2000s to recent years, with an average annual increase of 0.81 days. Using fire emissions from the Global Fire Assimilation System (GFAS), we estimate an even greater increase in fire season length—up to 42.33 days—based on recorded fire start and end dates, though this may include non-natural fires. The extension of fire season, as derived from temperature thresholds, has led to an additional 2.09 × 10⁸ kg of PM_2.5 emissions, representing a 3.6% overall increase. To assess the air quality impacts of this lengthened fire season, we use the GEOS-Chem chemical transport model with GFAS fire emissions. Our results reveal that the Alaskan population has been experiencing prolonged exposure to elevated fire-driven PM_2.5 levels each year, with local peaks reaching extreme levels, such as 2036.14 μg/m³ in 2010. The peak fire-driven PM_2.5 concentrations during the extended fire season far exceed the U.S. Environmental Protection Agency (EPA)’s 24-h standard (35 μg/m³), underscoring the escalating air quality and public health risks in Alaska. With global implications for climate, air quality, and public health, this study provides a valuable reference for future wildfire research in fire-prone regions.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"255 ","pages":"Article 105076"},"PeriodicalIF":4.0,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145093919","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":"Global patterns in primary production of marine phytoplankton taxonomic groups","authors":"Deyong Sun ,&nbsp;Yongjun Jia ,&nbsp;Shihan Yang ,&nbsp;Shuyan Lang ,&nbsp;Zixu Ye ,&nbsp;Zhenghao Li ,&nbsp;Shengqiang Wang","doi":"10.1016/j.gloplacha.2025.105057","DOIUrl":"10.1016/j.gloplacha.2025.105057","url":null,"abstract":"<div><div>Documenting variations in phytoplankton primary productivity has garnered global attention. However, little is known about its composition, since the phytoplankton community is a complex assemblage of different phytoplankton taxonomic groups (PTGs) with distinct functions. This study developed an absorption-based technical solution to gain dominant PTGs' primary production, including diatoms, chlorophytes, cyanobacteria, cryptophytes, dinoflagellates, and haptophytes. The core of our method is to decompose the satellite-derived total phytoplankton absorption coefficient (a_ph(λ)) into group-specific components using a Gaussian decomposition technique constrained by diagnostic pigment analysis. Satellite-derived results over the past two decades (2002−2022) indicate that cyanobacteria dominate the equatorial and mid-low latitude oceans, accounting for more than 60 % of primary production, whereas diatoms and chlorophytes primarily prevail in coastal and mid-high latitude regions. The primary production trends of PTGs have been generally stable, with short-term (one-year) periodic fluctuations. Globally, diatoms contribute the largest share (38 %) to the variation in total primary production, followed by cyanobacteria (23 %) and chlorophytes (22 %). Our work provides the first global two-decadal record of sea surface PTGs' primary productivity variations.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"255 ","pages":"Article 105057"},"PeriodicalIF":4.0,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145049883","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":"Sedimentary records of East Asian Summer Monsoon evolution and source-sink variations in the northern continental slope of the South China Sea since 70 ka","authors":"Zhibing Zhou ,&nbsp;Huanhao Liu ,&nbsp;Zhongbo Wang ,&nbsp;Debo Zhao ,&nbsp;Shaohua Zhao ,&nbsp;Jun Sun ,&nbsp;Pengyu Qiao ,&nbsp;Jierui Huo ,&nbsp;Qiuxuan Peng ,&nbsp;Yang Wang ,&nbsp;Nan Wang ,&nbsp;Shouye Yang","doi":"10.1016/j.gloplacha.2025.105059","DOIUrl":"10.1016/j.gloplacha.2025.105059","url":null,"abstract":"<div><div>The orbital-scale evolution of the East Asian Summer Monsoon (EASM) and its response mechanism to low- and high-latitude driving processes remains unclear. The South China Sea (SCS), characterized by thick sedimentary sequences with high accumulation rates, preserves a detailed record of the EASM variability across different climatic periods during the Quaternary period. Here, Core SCSZ22–3 from the northern SCS was systematically analyzed using lithological examination, accelerator mass spectrometry (AMS) ¹⁴C dating, stable oxygen isotopes (δ¹⁸O), Sr<img>Nd isotopic compositions, and grain size end-member modeling (EMM) to investigate provenance and sedimentary responses to EASM evolution over the past 70 ka. The results indicate that the Taiwan, the Pearl, and the Luzon rivers are the primary contributors to the deposition on the northern slope of the SCS. EM2 component (1.8–12.1 μm) can serve as a proxy indicator for the EASM, thereby providing insights into global millennial-scale climate changes. Spectral analysis and continuous wavelet transform of EM2 reveals distinct orbital periodicities of 31.1, 18.7, and 11.7 ka, and the semi-orbital periodicities of 5.9, 2.3, and 1.2 ka. The 18.7 ka periodicity suggests that precession is the dominant factor controlling the EASM in the SCS. Additionally, the 11.7 ka periodicity indicates that semi-precession exerts a significant influence on monsoon variations within low-latitude regions. Simultaneously, the periodicities of 5.9, 2.3, and 1.2 ka may be attributed to a combined effect resulting from variations of global ice sheets and insolation. The response of the monsoon indicator to these orbital periodicities implies that EASM changes are driven by both low- and high- latitude climatic processes. The findings will highlight the influence of low-latitude forcing on global climatic changes and its implications for late Quaternary evolution of the EASM.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"255 ","pages":"Article 105059"},"PeriodicalIF":4.0,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145093936","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}