Global and Planetary Change最新文献

{"title":"Three thousand years of effective infiltration in eastern Australia: A multi proxy stalagmite record from Wombeyan Caves, New South Wales, Australia","authors":"Matthew James Goodwin, Danielle C. Verdon-Kidd, Silvia Frisia, Andrea Borsato, Quan Hua, Daryl Howard, Janece McDonald, Russell Drysdale, Pauline Treble, Monika Markowska","doi":"10.1016/j.gloplacha.2025.105096","DOIUrl":"https://doi.org/10.1016/j.gloplacha.2025.105096","url":null,"abstract":"Understanding how climate drivers have influenced Eastern Australia (EA) hydroclimate variability over recent millennia is hampered by the short duration of instrumental climate records (<120 years). Proxy data measured from a stalagmite collected from Wombeyan Caves (NSW, Australia) extends the EA hydroclimate record to a 3000-year period, from 1045 BCE to 2006 CE. High-resolution time series of past water infiltration are derived from microstratigraphy, trace element concentrations, stable carbon and oxygen isotope ratios, and dated using radiocarbon. Principal Component Analysis (PCA) of hydroclimate-sensitive trace elements identified a dominant mode of variability (PC1) that strongly aligns with cool-season water balance. This mode demonstrates coherence with known climate drivers, highlighting a persistent influence of the El Niño–Southern Oscillation (ENSO), the Interdecadal Pacific Oscillation (IPO) and the Southern Annular Mode (SAM) on EA hydroclimate over the past three millennia. Solar variability, volcanic aerosol forcing and temperature variability also modulate effective infiltration, which closely follows reconstructed Common-Era temperature trends, suggesting that atmospheric precipitation-temperature scaling can increase total precipitation and/or precipitation intensity in EA with increasing temperatures. Decades-to-centuries-long wetter conditions (from ca. 200–1080 CE and in the 15th and 16th centuries) alternated with dry conditions of similar duration (for example from 1490 to 1590 CE, in the early and later parts of the 1800s and in the early 1900s), supporting the idea that pluvial and drought periods can be even longer than those observed in the instrumental record. The Wombeyan stalagmite provides a baseline for advancing our current understanding of how interactions between different drivers of hydroclimate in EA result in long drought spells/pluvial events.","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"73 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145229126","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":"Complex network approaches for identifying global drought teleconnection patterns","authors":"Wenliang Wang ,&nbsp;Lei Zhou ,&nbsp;Congcong He ,&nbsp;Yongwen Zhang ,&nbsp;Zhiqiang Gong ,&nbsp;Na Ying ,&nbsp;Panjie Qiao ,&nbsp;Jianjun Wu ,&nbsp;Hongquan Sun ,&nbsp;Jingfang Fan","doi":"10.1016/j.gloplacha.2025.105093","DOIUrl":"10.1016/j.gloplacha.2025.105093","url":null,"abstract":"<div><div>As anthropogenic forces amplify extreme droughts, understanding their global connections is essential for prediction and mitigation plans to fortify ecosystem and societal resilience. However, traditional methods struggle to effectively capture the complex, nonlinear, and asynchronous spatiotemporal associations among drought events across regions. To address this, we introduced a novel complexity-based approach that constructs a global extreme drought complex network using monthly-scale Standardized Precipitation Evapotranspiration Index (SPEI) data from 1901 to 2021. By applying the Event Synchronization (ES) method and analyzing key network metrics, we revealed the spatiotemporal associations and synchronous propagation pathways of drought events. Our approach identified major global drought source regions (out-degree &gt;667), including northern and southern Africa, western Australia, central Europe, and central Asia, as well as key sink regions (in-degree &gt;863), such as the Tibetan Plateau (TP), Indonesia, central South America, and the Amazon Basin. Using network metrics, we quantified the dominant directions and propagation distances of drought teleconnections across regions, revealing that the average global drought propagation distance exceeds 11,000 km. Regions such as the TP and the Amazon exhibited high betweenness centrality (BC), underscoring their critical roles as hubs in the global drought propagation network. Furthermore, we used the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) Lagrangian particle transport model to simulate moisture transport pathways from the European drought source region to the TP sink region. By integrating complex network analysis with the Lagrangian transport model, we conducted an in-depth investigation of drought propagation pathways. This dual approach reveals previously unrecognized yet highly consistent physical mechanisms underlying drought occurrence and propagation. These findings offer valuable insights for the development of effective drought mitigation strategies.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"255 ","pages":"Article 105093"},"PeriodicalIF":4.0,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221026","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":"Elevation controls bacterial branched GDGT-based temperature proxies: A regional to global perspective","authors":"Biswajit Roy, Rasmus Thiede, Sibin Simon, Anurag Kumar, Saisiddhant Moharana, Saptarshi Dey, Felix J. Elling","doi":"10.1016/j.gloplacha.2025.105101","DOIUrl":"https://doi.org/10.1016/j.gloplacha.2025.105101","url":null,"abstract":"Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are bacterial lipids used as proxies for past temperature and pH reconstruction in terrestrial environments. Nevertheless, global calibrations often show discrepancies between observed and proxy-based predictions across soils spanning both latitudinal and elevational gradients. As orographic barriers in mountain regions create distinct elevation-dependent environmental conditions, soils across elevational transects may result in distinct growth conditions of brGDGT producers than expected from their latitude. To assess the impact of elevation on brGDGT proxies, we investigated a Western Himalayas (300–5500 m) transect spanning natural gradients in soil properties, precipitation, temperature and seasonality. BrGDGT-estimated pH agrees with the observed soil pH, while brGDGT-estimated temperatures show deviations of −10 to +10 °C from observed mean annual temperatures across our transect as well as other Himalayan transects. We find that these deviations are dependent on cumulative heat, quantified as growing degree days above 0 °C (GDD<ce:inf loc=\"post\">0</ce:inf>). An analysis of globally distributed soils and peats (<ce:italic>n</ce:italic> = 1795) shows that GDD<ce:inf loc=\"post\">0</ce:inf> is positively correlated with the degree of methylation of brGDGTs, suggesting that microbial lipid production is seasonally biased and favors colder-season signals in warm climates (high GDD<ce:inf loc=\"post\">0</ce:inf>) and warm-season signals in cool climates (low GDD<ce:inf loc=\"post\">0</ce:inf>) across elevational and latitudinal gradients. We further suggest that scatter in brGDGT temperature estimates increases in regions where elevation-driven orographic effects create localized variability in bacterial growth conditions. Such non-uniform growth conditions induced by regional (orographic) factors can locally modulate broader climate trends, which results in biases and scatter within global calibrations and paleotemperature reconstructions.","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"8 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145229128","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":"GRACE-derived spatiotemporal changes of terrestrial water storage in the major plateaus of China","authors":"Dong Wang ,&nbsp;Bo-Hui Tang ,&nbsp;Yingyun Li ,&nbsp;Wei Fu ,&nbsp;Zhitao Fu ,&nbsp;Zhen Zhang ,&nbsp;Zhongxi Ge","doi":"10.1016/j.gloplacha.2025.105102","DOIUrl":"10.1016/j.gloplacha.2025.105102","url":null,"abstract":"<div><div>Changes in terrestrial water storage (TWS) significantly impact water resource regulation in the major plateaus of China (MPC). Traditional monitoring methods are limited by high costs and sparse site distribution, restricting large-scale and high-resolution assessments. The Gravity Recovery and Climate Experiment (GRACE) and its follow-on mission offer an effective approach for TWS observation in these areas. This study examines the spatiotemporal features of TWS in MPC from 2002 to 2022 by recovering low-degree signals through coefficient substitution, restoring high-degree signals via combined filtering, and interpolating missing data using Singular Spectrum Analysis (SSA). Key findings reveal a TWS change rate of −0.1 cm/year in the MPC, with semi-annual and annual amplitudes of 0.7 cm and 2.3 cm, respectively, peaking between September and October. TWS variations in the MPC are largest in the Qinghai-Tibet Plateau (QTP) and this dominant signal tends to mask the trends in other plateau regions. Among these, the Yunnan-Kweichow Plateau (YKP) is exhibiting a gradually increasing TWS trend. In the western YKP, TWS declines due to concentrated rainfall, while in its eastern regions, a combination of reduced seasonal precipitation and water migration contributes to an overall upward trend. These findings provide critical insights for regional water resource management and policy formulation.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"255 ","pages":"Article 105102"},"PeriodicalIF":4.0,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221196","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":"Unraveling the diverse grazing effects: Examining the variations in spatial patterns of soil microbial diversity across dimensions, Kingdoms, and depths in Tibetan grasslands","authors":"Tianyu Li ,&nbsp;Haorui Zhang ,&nbsp;Rang Ding ,&nbsp;Gang Fu","doi":"10.1016/j.gloplacha.2025.105103","DOIUrl":"10.1016/j.gloplacha.2025.105103","url":null,"abstract":"<div><div>Changes in soil microbes have profound effects on ecosystem stability. However, the effects of grazing on soil organisms, particularly their spatial distributions, are still unclear in grasslands. We investigated the responses of the three dimensions (taxonomic, functional, and phylogenetic) of α- and β-diversity, along with the community composition of two Kingdoms (fungi and bacteria), to grazing in the Xizang's grasslands. Here, α-diversity referred to the diversity within a single microbial community, which was measured across taxonomic, functional, or phylogenetic dimensions under either fenced or grazing conditions at a particular site. β-diversity represented the differences in taxonomic, functional, or phylogenetic composition either between two sites under the same conditions or between fenced and unfenced areas within the same site. The overall effects of grazing on soil microbes depended on the dimensions, Kingdoms and depths across all sites. For instance, at 0–5 cm, grazing increased the functional Shannon α-diversity of bacteria but not fungi. Responses of soil microbes to grazing showed clear spatial patterns, and these responses also varied with soil depth, microbial Kingdoms, and diversity dimensions. These response patterns were determined by differences in the relative influence of the three assembly processes (similarity, richness difference, and replacement), as well as by shifts in predominant environmental variables. Therefore, in the future protection of soil microbial diversity, the three dimensions of taxonomy, function, and phylogeny should be considered simultaneously. Meanwhile, more attention should be paid to the α-diversity of soil bacteria rather than soil fungi. In terms of soil microbial diversity protection, fencing is not always effective.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"255 ","pages":"Article 105103"},"PeriodicalIF":4.0,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221027","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":"Geodynamic evolution of the Paleo-Asian Ocean: Sr–Nd–Pb–Hf isotopic evidence from Paleozoic ophiolites and arc igneous rocks in the Central Tianshan, Northwest China","authors":"Yujia Song ,&nbsp;Xijun Liu ,&nbsp;Wenjiao Xiao ,&nbsp;Honghu Zeng ,&nbsp;Yao Xiao ,&nbsp;Pengde Liu ,&nbsp;Gang Chen","doi":"10.1016/j.gloplacha.2025.105099","DOIUrl":"10.1016/j.gloplacha.2025.105099","url":null,"abstract":"<div><div>Orogenic belts worldwide record the geodynamic processes associated with the opening and closure of ancient oceans, and their study is fundamental to understanding global plate tectonics, mantle evolution, and continental growth. Unraveling the temporal evolution of oceanic lithosphere and related mantle domains in different orogens provides key insights into how regional tectonic processes reflect, and contribute to, global geodynamic systems. The Tianshan Orogenic Belt, as part of the Central Asian Orogenic Belt, was characterized by extensive Paleozoic magmatism linked to the evolution of the Paleo-Asian Ocean. However, its tectonic evolution and mantle characteristics remain unclear. To address this gap, we conducted a detailed field, geochronological, whole-rock and mineral geochemical, and Sr–Nd–Hf–Pb isotopic study of a newly identified ophiolite and dioritic pluton in Bingdaban, northern Central Tianshan. The diorite (462–449 Ma) has arc-like geochemical features and slightly depleted isotopic signatures. These characteristics indicate formation by 10 %–20 % partial melting of spinel lherzolite in the lithospheric mantle, with chemical modification by melts derived from the southward-subducting North Tianshan oceanic lithosphere. The ophiolitic mafic rocks yielded zircon U–Pb ages of 433–432 and 273 Ma, and have mid-ocean ridge basalt-like trace element and isotopic compositions, suggesting formation by 5 %–20 % partial melting of depleted spinel lherzolite, likely in a mid-ocean ridge setting. These results indicate that the North Tianshan Ocean existed until at least the late Permian. Moreover, Nd–Pb isotope data reveal a temporal transition from Pacific Ocean– to Indian Ocean–type mantle characteristics from the early to late Paleozoic, identifying the Tianshan Orogenic Belt represents a transitional zone between the Central Asian Orogenic Belt and Tethyan domain. Our findings indicate that tectonically-induced asthenospheric flow permits interactions between Pacific- and Indian-type mantle domains and contributes to evolving mantle compositions. More broadly, the documented Pacific- to Indian Ocean–type mantle transition in the Paleo-Asian Ocean provides a valuable analogue for understanding global-scale changes in mantle domains and their role in shaping the evolution of ancient oceans and orogenic systems.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"255 ","pages":"Article 105099"},"PeriodicalIF":4.0,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221195","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":"Younger Dryas turbidites indicate increased storminess in the North Atlantic","authors":"Ya Gao ,&nbsp;Alexandre Normandeau ,&nbsp;David J.W. Piper ,&nbsp;Yang Yang ,&nbsp;Xinong Xie ,&nbsp;Ming Su","doi":"10.1016/j.gloplacha.2025.105097","DOIUrl":"10.1016/j.gloplacha.2025.105097","url":null,"abstract":"<div><div>The Younger Dryas (YD) stands as one of the most abrupt climatic perturbations during the last deglaciation, marked by rapid North Atlantic cooling and global environmental upheaval. While the associated changing ocean-atmosphere dynamics are widely documented, the cascading impacts of its climate instability on deep-sea sedimentation remain poorly constrained, partly due to limited continuous high-resolution records spanning the entire period. Here, we analyzed two sediment cores from the glacially influenced SW Grand Banks slope off Newfoundland, Eastern Canada, presenting well-preserved distinct sedimentary sequences formed by downslope and along-slope processes, respectively. Within a canyon at ∼1500 m water depth, a ∼ 3 m thick YD interval features fine-grained turbidites initiated at the YD onset, peaking at 7 events per century during mid-YD, and persisting throughout the episode. Outside the canyon, a complete typical contourite sequence characterized by reverse-to-normal grading was identified at ∼2600 m water depth. Regional comparisons indicate that neither sediment instability alone nor earthquakes likely dominated YD turbidity current triggering. Rather, shared downslope sediment sources but distinct along-slope transport signatures between the turbidites and contourites imply storm-driven cross-shelf sediment supply enhancement, based on which we propose that increased storm activity promoted sediment accumulation at canyon heads, preconditioning YD turbidity currents. A mid-YD weakening of the along-slope current provides new evidence of oceanic changes preceding atmospheric shifts. This study elucidates how YD climatic instability reconfigured glaciomarine sediment dispersal and underscores the importance of understanding abrupt millennial-scale events for forecasting future geohazards under climate change scenarios.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"255 ","pages":"Article 105097"},"PeriodicalIF":4.0,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145181275","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":"Local atmospheric forcing dominates the panthalassa/pacific mid-latitude decadal variability","authors":"Sheng Wu ,&nbsp;Yingying Zhao ,&nbsp;Yongyun Hu ,&nbsp;Yonggang Liu ,&nbsp;Jian Zhang ,&nbsp;Anni Zhao ,&nbsp;Qin Wen ,&nbsp;Xiang Li ,&nbsp;Shuai Yuan ,&nbsp;Zihan Yin","doi":"10.1016/j.gloplacha.2025.105095","DOIUrl":"10.1016/j.gloplacha.2025.105095","url":null,"abstract":"<div><div>The Pacific Decadal Variability (PDV) is an important factor that significantly influences regional and global climate changes for modern climate. However, the mechanisms behind PDV remain a subject of ongoing debate, on which the investigation of PDV for land-sea configurations different from now may shed light. In this study, PDV dynamics for three typical land-sea configurations are investigated: the Mississippian, Triassic, and Pre-industrial experiments. Specifically, we analyze the relative contributions of atmospheric and oceanic forcings to PDV and investigate how local and remote factors influence its variability. The findings reveal that PDV is primarily driven by local atmospheric forcing, while oceanic heat transport plays a minor role. These findings provide new insights into the underlying mechanisms governing PDV, especially for different land-sea configurations, advancing our understanding of its role in Earth's climate system.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"255 ","pages":"Article 105095"},"PeriodicalIF":4.0,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159451","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":"The prolonged weak monsoon event in East Asia and the interhemispheric seesaw: implications for persistent AMOC forcing at the mid-late Holocene transition","authors":"Maoxia Li ,&nbsp;Weihong Zhang ,&nbsp;Shitao Chen ,&nbsp;Jianshun Chen ,&nbsp;Yifei Wang ,&nbsp;Qingfeng Shao ,&nbsp;Yongjin Wang","doi":"10.1016/j.gloplacha.2025.105091","DOIUrl":"10.1016/j.gloplacha.2025.105091","url":null,"abstract":"<div><div>The interhemispheric seesaw at lower latitudes is well established from the last glaciation to the early Holocene. This phenomenon is driven by variations in the Atlantic Meridional Overturning Circulation (AMOC) and the associated latitudinal migration of the Intertropical Convergence Zone (ITCZ). However, the persistence of this phenomenon and the mechanisms involved during the late Holocene, a period characterized by minimal and stable global ice volume, remain unclear. This study presents a new 5.3-year-resolution stalagmite δ¹⁸O record from central China spanning 4.4–3.0 ka BP. Our data reveal a multi-centennial weak Asian summer monsoon (ASM) event spanning 4.4–3.5 ka BP that is inversely correlated with intensified South American summer monsoon (SASM) activity. This antiphase relationship mirrors the pattern observed during the Little Ice Age (LIA), suggesting a consistent seesaw mechanism. Further analysis shows that an AMOC slowdown coupled with a southward shift in the ITCZ created this hemispheric antiphase during both events. El Niño-like conditions further strengthened the ASM–SASM antiphase relationship during both the 4.4–3.5 ka event and the LIA. Unlike the typical AMOC–solar correlation observed during the LIA, the weakened AMOC during the 4.4–3.5 ka event coincided with strong solar activity. Our results emphasize the persistent seesaw pattern during the mid-to-late Holocene transition, which is driven by changes in the AMOC and El Niño-Southern Oscillation (ENSO) rather than solar activity.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"255 ","pages":"Article 105091"},"PeriodicalIF":4.0,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221197","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":"Indian summer monsoon variability across the last 9000 years: New evidence from stalagmites of southwestern China","authors":"Yanzhen Li ,&nbsp;Chunju Huang ,&nbsp;Jianghu Lan ,&nbsp;David B. Kemp ,&nbsp;James G. Ogg ,&nbsp;Ashish Sinha ,&nbsp;Lvfan Chen ,&nbsp;Xiqian Wang ,&nbsp;Huiru Tang ,&nbsp;Xu Lin ,&nbsp;Khalaf H.M. Abdel-Raheem ,&nbsp;Rui Zhang ,&nbsp;Hai Cheng ,&nbsp;R. Lawrence Edwards ,&nbsp;Liangcheng Tan","doi":"10.1016/j.gloplacha.2025.105092","DOIUrl":"10.1016/j.gloplacha.2025.105092","url":null,"abstract":"<div><div>The Indian Summer Monsoon (ISM) contains both the Arabian Sea branch (ISM_AS) and the Bay of Bengal branch (ISM_BOB), which may act differently during various timescales. Accurately dated, high-resolution climate records from different regions of the ISM domain are needed to fully understand the spatiotemporal variability and dynamic mechanisms of the ISM. Based on high-precision U<img>Th dating chronologies and oxygen isotope (δ¹⁸O) records of three stalagmites from Shenqi Cave (SQ) from southwestern China, we reconstructed a high-resolution history of the ISM_BOB over the past 9000 years. Our SQ δ¹⁸O results demonstrate that the orbital-scale weakening of the Holocene ISM_BOB was predominantly controlled by changes in Northern Hemisphere summer insolation (NHSI), consistent with the ISM_AS and EASM record in the broad Asian summer monsoon region. However, in contrast to the strengthening of the ISM_AS and EASM during the last 2000 years, our δ¹⁸O record indicates a long-tern weakening trend of the ISM_BOB during this period. The ISM_BOB was at its strongest during 9.0–7.5 ka BP, and a rapid weakening occurred between 7.2 and 5.0 ka BP. We propose that the abrupt ISM_BOB weakening during 7.2–5.0 ka BP may have been linked to high-latitude Northern Hemisphere cooling, which enhanced the interhemispheric temperature gradient and drove a southward migration of the Intertropical Convergence Zone (ITCZ). During the 8.2 ka event, the SQ δ¹⁸O shows clear positive shifts, indicating transient ISM_BOB weakening, which rapidly responded to the North Atlantic freshwater forcing. The ISM_BOB was generally weak during the 4.2 ka event, with two decadal-scale monsoon strengthening intervals.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"255 ","pages":"Article 105092"},"PeriodicalIF":4.0,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221098","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}