Geomorphology最新文献

Surface karst geomorphology in the Jahani salt extrusion, Zagros Mountains, Iran 伊朗扎格罗斯山贾哈尼盐挤压地表岩溶地貌

IF 3.1 2区地球科学

Geomorphology Pub Date : 2025-05-29 DOI: 10.1016/j.geomorph.2025.109859

Francisco Gutiérrez , Issa Ilyati , Mehdi Zarei

{"title":"Surface karst geomorphology in the Jahani salt extrusion, Zagros Mountains, Iran","authors":"Francisco Gutiérrez , Issa Ilyati , Mehdi Zarei","doi":"10.1016/j.geomorph.2025.109859","DOIUrl":"10.1016/j.geomorph.2025.109859","url":null,"abstract":"<div><div>This work analyses the superlative salt karst developed on Jahani salt extrusion (ca. 70 km<sup>2</sup>, 900 m in local relief). This active diapir is expressed as a salt fountain comprising a summit dome above the feeding vent and laterally spreading salt glaciers (i.e., namakiers) moving at rates of the order of cm/yr. The salt extrusion hosts the first documented and mapped salt karst poljes, developed at the foot of the steep rock salt slopes of the summit dome by differential suballuvial dissolution and expansion by rim dissolution. A cartographic inventory of 6489 sinkholes has allowed to characterise morphometrically the differences between the juvenile and mature sinkhole landscapes developed in the proximal and distal sectors of a namakier, respectively. Sinkholes developed in the recently expelled salt at the proximal sector have an average length four times smaller (23 m versus 83 m) and a density three times higher (600 versus 200 sinkholes/km<sup>2</sup>), reflecting the variable impact of expansion and coalescence processes. The Firuzabad River has trimmed the northern namakier, generating a 6 km long and > 400 m high salt escarpment, likely the largest on Earth. The dynamics of the escarpment is governed by the antagonistic roles of salt flow and rapid erosion by fluvial undermining, rock falls and dissolutional removal of the rock salt debris, causing severe hydrochemical degradation of the river waters. Exceptional halite rimstones occur in a marginal stream largely fed by permanent brine springs.</div></div>","PeriodicalId":55115,"journal":{"name":"Geomorphology","volume":"485 ","pages":"Article 109859"},"PeriodicalIF":3.1,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144178478","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}

引用次数: 0

Spatio-temporal geomorphological evolution and driving factors of a transgressive dunefield, Qinghai Lake, northeastern Tibetan Plateau 青藏高原东北部青海湖海侵沙丘场时空地貌演化及驱动因素

IF 3.1 2区地球科学

Geomorphology Pub Date : 2025-05-28 DOI: 10.1016/j.geomorph.2025.109860

Haokun Mo, Guangyin Hu, Linhai Yang, Zhi Zhang, Jingjing Hu, Huicong Meng, Na Gao, Zhibao Dong

{"title":"Spatio-temporal geomorphological evolution and driving factors of a transgressive dunefield, Qinghai Lake, northeastern Tibetan Plateau","authors":"Haokun Mo, Guangyin Hu, Linhai Yang, Zhi Zhang, Jingjing Hu, Huicong Meng, Na Gao, Zhibao Dong","doi":"10.1016/j.geomorph.2025.109860","DOIUrl":"10.1016/j.geomorph.2025.109860","url":null,"abstract":"<div><div>This study aims to investigate the evolution and driving factors of the transgressive dunefield on the eastern shore of Qinghai Lake. Image analysis showed that the transgressive dunefield had continuously moved inland from the lakeshore and experienced three major stages between 1970 and 2020: Stage 1 (1970–1996), the dunefield moved slowly (1.40 m/yr); Stage 2 (1996–2013), the dunefield moved rapidly (15.66 m/yr); and Stage 3 (2013−2020), the movement of the dunefield slowed down (7.70 m/yr). The grain size characteristics of the surface sediments indicated that material from the lakeshore was transported inland, undergoing continuous sorting and transformation by the wind. By combining the ERA5-Land dataset and meteorological data to assess the environmental changes, it was found that the correlation between the wind and the changes in dunefield movement speed was weak, as the wind speed progressively weakened throughout the study period. However, the deceleration or acceleration of the dunefield movement often corresponded to the advance or retreat of the shoreline as the lake level rose or fell. This was because the change of the lake level and shoreline indirectly affected the movement speed by regulating the sand supply. Furthermore, the lake level and shoreline change in Qinghai Lake were still primarily controlled by climate change. In general, this study offers a valuable example of transgressive dunefield development along the lakeshore and traces its evolution over the past 50 years by multi-source image data. The results suggest that transgressive dune sheets or dune fields can evolve directly from the lakeshore. It also indicates that transgressive dunefields are initiated as a response to the water level fall in cold and arid environments with abundant sand supply.</div></div>","PeriodicalId":55115,"journal":{"name":"Geomorphology","volume":"484 ","pages":"Article 109860"},"PeriodicalIF":3.1,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144167744","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}

引用次数: 0

Landsystem models from remote and field based geomorphological mapping reveal diverse glacier dynamics on Svalbard 基于遥感和野外地貌测绘的陆地系统模型揭示了斯瓦尔巴群岛冰川动态的多样性

IF 3.1 2区地球科学

Geomorphology Pub Date : 2025-05-24 DOI: 10.1016/j.geomorph.2025.109854

Rebecca McCerery , Bethan J. Davies , Harold Lovell , Rosalia Calvo-Ryan , David A. Pearce , Jakub Małecki , John Woodward

{"title":"Landsystem models from remote and field based geomorphological mapping reveal diverse glacier dynamics on Svalbard","authors":"Rebecca McCerery , Bethan J. Davies , Harold Lovell , Rosalia Calvo-Ryan , David A. Pearce , Jakub Małecki , John Woodward","doi":"10.1016/j.geomorph.2025.109854","DOIUrl":"10.1016/j.geomorph.2025.109854","url":null,"abstract":"<div><div>Glacial landsystems are geomorphological records produced by glaciers that provide important insights into past and present glacier dynamics. Here, we present a snapshot of the diversity in glacier landsystems in Svalbard. We present remote and field geomorphological mapping from 11 glaciers: seven in south Spitsbergen (Scottbreen, Renardbreen, Antoniabreen, Penckbreen, Bakaninbreen, Paulabreen and Skobreen) and four in northwest Spitsbergen (Charlesbreen, Protektorbreen, Bullbreen, and Ferdinandbreen). These examples include landform assemblages that (1) are diagnostic of recent surging in terrestrial and marine settings; (2) are characteristic of thinning polythermal glaciers that have previously been more dynamic; and (3) represent rapidly vanishing glaciers, the geomorphological endpoint for Svalbard glaciers characterised by the fragmentation and downwasting of small cold-based glaciers. We synthesize these into four landsystem models to provide a framework for interpreting glacier dynamics in Svalbard based on geomorphological records. The hypsometries of many land-terminating glaciers in Svalbard suggests that we will increasingly observe the transition from polythermal to cold-based glacier thermal regimes as the climate continues to warm, ultimately leading to more vanishing glaciers. This has important wider implications for changing water, sediment and biogeochemical fluxes which will impact subglacial, forefield and ocean ecosystems.</div></div>","PeriodicalId":55115,"journal":{"name":"Geomorphology","volume":"484 ","pages":"Article 109854"},"PeriodicalIF":3.1,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144167741","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}

引用次数: 0

Quantifying small scale spatial variability in diffusive erosion and deposition 漫漫性侵蚀和沉积的小尺度空间变异性定量研究

IF 3.1 2区地球科学

Geomorphology Pub Date : 2025-05-23 DOI: 10.1016/j.geomorph.2025.109853

G.R. Hancock, W.D. Dimuth P. Welivitiya

{"title":"Quantifying small scale spatial variability in diffusive erosion and deposition","authors":"G.R. Hancock, W.D. Dimuth P. Welivitiya","doi":"10.1016/j.geomorph.2025.109853","DOIUrl":"10.1016/j.geomorph.2025.109853","url":null,"abstract":"<div><div>Hillslope and catchment evolution will be the cumulative product of short and long-term processes that operate and dominate over different hillslope length scales. In this study, erosion and deposition pattern rates generated over short lengths scales (0.1–3 m) are examined using erosion pins over 14 years for a field site in northern Australia. The pins consisted of two sets of nine pins located on a catchment divide. Over the 14 years, there was considerable variability in erosion and deposition with both sites being depositional (~7 mm of deposition). The sites, separated by several hundred metres both had very similar erosion and deposition patterns. Annual erosion and deposition patterns were modelled using a computer-based Landscape Evolution Model (SSSPAM) that models both fluvial and diffusive erosion. Model results found that SSSPAM was unable to predict the erosion and deposition rate and patterns using a Digital Elevation Model (DEM) for the site. However, when the DEM was modified at each annual time step to capture short length scale random particle movement, SSSPAM predicted both erosion and deposition variability as well as the field measured deposition. This is the first time that a hillslope diffusion model has been evaluated for erosion produced by rainfall. The model results demonstrate that the commonly used equation for diffusion when calibrated for the site performs well.</div></div>","PeriodicalId":55115,"journal":{"name":"Geomorphology","volume":"484 ","pages":"Article 109853"},"PeriodicalIF":3.1,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144167743","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}

引用次数: 0

Study on the hydrodynamic mechanics and soil mechanical characteristics under the phenomenon of river-bottom tearing scour (RBTS) 河底撕裂冲刷现象下的水动力力学与土力学特性研究

IF 3.1 2区地球科学

Geomorphology Pub Date : 2025-05-22 DOI: 10.1016/j.geomorph.2025.109846

Enhui Jiang , Yanhui Liu , Li Pan , Xianfeng He , Yan Lan , Junhua Li , Yuanjian Wang

{"title":"Study on the hydrodynamic mechanics and soil mechanical characteristics under the phenomenon of river-bottom tearing scour (RBTS)","authors":"Enhui Jiang , Yanhui Liu , Li Pan , Xianfeng He , Yan Lan , Junhua Li , Yuanjian Wang","doi":"10.1016/j.geomorph.2025.109846","DOIUrl":"10.1016/j.geomorph.2025.109846","url":null,"abstract":"<div><div>River-bottom tearing scour (RBTS) refers to the phenomenon wherein clay layers formed by the deposition and solidification of extremely fine cohesive sediment are uplifted, and exposed to the water surface during the hyperconcentrated floods. While prior research has established the conditions for RBTS occurrence, its underlying physical mechanisms remain unclear. In this study, to investigate the hydrodynamic mechanics and soil mechanical characteristics associated with the RBTS phenomenon, a series of direct shear tests on clay blocks collected from river reaches prone to the RBTS phenomenon and flume experiments simulating the RBTS phenomenon were conducted. The former direct shear tests revealed that the clay blocks generally possess high shear strength, a characteristic strongly influenced by their water content and grain size gradation. Observations from the latter flume experiments showed pronounced turbulence around the clay blocks, with measurement data indicating that the vertical distributions of flow velocity and turbulence intensity during the RBTS phenomenon are governed by the discharge, scour pit depth and rotation angle of the clay blocks… The aforementioned turbulence was identified as the source of uplift force on the clay block, while the high shear strength of unsaturated clay blocks enables them to resist fragmentation during uplift, thereby contributing to the characteristic RBTS formation process. Moreover, empirical expressions for the vertical distribution of longitudinal flow velocity, as well as the shear strength of clay blocks during the RBTS phenomenon were proposed. The conclusions in this paper can provide new insights into the hydrodynamic mechanism and soil mechanical characteristics underlying the RBTS phenomenon.</div></div>","PeriodicalId":55115,"journal":{"name":"Geomorphology","volume":"484 ","pages":"Article 109846"},"PeriodicalIF":3.1,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144167742","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}

引用次数: 0

Selection of optimal factor combinations for typhoon-induced landslides susceptibility mapping using machine learning interpretability 利用机器学习可解释性选择台风诱发滑坡易感性制图的最佳因子组合

IF 3.1 2区地球科学

Geomorphology Pub Date : 2025-05-22 DOI: 10.1016/j.geomorph.2025.109855

Fei Wang , Liwei Zhou , Jianjun Zhao , Yanling Liu , Jibing Chen , Zitong Wen , Chen Zheng , Wei Hong , Chieh-Hung Chen

{"title":"Selection of optimal factor combinations for typhoon-induced landslides susceptibility mapping using machine learning interpretability","authors":"Fei Wang , Liwei Zhou , Jianjun Zhao , Yanling Liu , Jibing Chen , Zitong Wen , Chen Zheng , Wei Hong , Chieh-Hung Chen","doi":"10.1016/j.geomorph.2025.109855","DOIUrl":"10.1016/j.geomorph.2025.109855","url":null,"abstract":"<div><div>With the intensification of extreme climate change globally, typhoon-induced landslides have become a serious threat to people's property and lives. Although some studies have identified wind, rainfall, and vegetation as contributing factors to landslides, challenges still remain in incorporating these factors into susceptibility mapping. This study aims to establish a foundation for selecting key factors that affect the susceptibility of typhoon-induced landslides. Specifically, this study innovatively employs the interpretability of machine learning, including Partial Dependence Plots (PDP) and Shapley values, to analyze the correlation between landslides and factors, and compares this with qualitative analysis. It assesses the significance of static factors, incorporates typhoon-related factors, and examines their collective impact. The critical static factors of typhoon-induced landslides identified by Shapley values, including elevation, normalized difference vegetation index (NDVI), road, slope, land use, river, aspect of slope, and vegetation. The k-fold cross-validation was utilized for computation of average descent accuracy, and facilitated the selection of optimal combination of dynamic and static factors, the effectiveness of which was confirmed through ROC (Receiver Operating Characteristic curve). The optimal combination of dynamic factors was determined by average descent accuracy: maximum sustained wind speed, 24 h pre-rainfall, distance from the landslides to the typhoon center and wind circle radius of near gale. Through rigorous verification, it was determined that optimizing factor combinations could increase the accuracy of evaluations by 1.5 %–3.5 %, thereby enhancing both the precision and reliability of susceptibility assessments for typhoon-induced landslides.</div></div>","PeriodicalId":55115,"journal":{"name":"Geomorphology","volume":"484 ","pages":"Article 109855"},"PeriodicalIF":3.1,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144131192","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}

引用次数: 0

Dynamic characteristics and erosion mechanisms of debris flows triggered by ice avalanches 冰崩引发的泥石流动力学特征及侵蚀机制

IF 3.1 2区地球科学

Geomorphology Pub Date : 2025-05-20 DOI: 10.1016/j.geomorph.2025.109835

Xiangning Li, Jiangang Chen, Xiaoqing Chen, Xi’an Wang, Jinshui Wang, Hechun Ruan, Min Huang

{"title":"Dynamic characteristics and erosion mechanisms of debris flows triggered by ice avalanches","authors":"Xiangning Li, Jiangang Chen, Xiaoqing Chen, Xi’an Wang, Jinshui Wang, Hechun Ruan, Min Huang","doi":"10.1016/j.geomorph.2025.109835","DOIUrl":"10.1016/j.geomorph.2025.109835","url":null,"abstract":"<div><div>Debris flows triggered by ice avalanches (abbreviated as <em>DFIs</em>) are a common catastrophic hazard in alpine regions, and their flow regimes may vary with ice content. Previous studies have focused mainly on the deposition characteristics, mobility, and hazard assessments of <em>DFIs</em>; however, no systematic investigations have focused on the basal stress characteristics and erosion mechanisms. In this study, a series of flume experiments were conducted to investigate the effects of the ice content on the flow regime and stress of a <em>DFI</em> during erosion. The results revealed that the flow regime of the <em>DFI</em> changed from friction-dominated to viscous/collisional-dominated flows with increasing ice content. Ice clearly contributed to the increase in flow velocity during erosion, whereas the effects on flow depth, stress and pore pressure were not significant. The erosion rate of <em>DFIs</em> was found to be independent of the water content of the bed and related to flow infiltration. Erosion affected only the uppermost soil particles, which immediately became saturated once <em>DFIs</em> flowed over them. Therefore, the critical Shields number can be used to describe the resistance of an initial soil bed to erosion, as the surficial soil particles are saturated by infiltrated flow. The shear stress exerted by the <em>DFI</em> can be directly measured, and then the erosion rate can be obtained. A comparison between the measured and calculated erosion rates of the methods in this study, those of a single-phase erosion model, and those of a two-phase erosion model proved that the results of our study were appropriate for describing the erosive forces of the <em>DFI</em>.</div></div>","PeriodicalId":55115,"journal":{"name":"Geomorphology","volume":"485 ","pages":"Article 109835"},"PeriodicalIF":3.1,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144166156","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}

引用次数: 0

Comment on De Ritis, R., Cocchi, L., Passaro, S, Chiappini, M., 2024. Giant slide, hidden caldera structure, magnetic anomalies, and tectonics in southern Tyrrhenian Sea (Italy) 评论德里斯，R.，科奇，L.，帕萨罗，S .，恰皮尼，M., 2024。意大利南部第勒尼安海的巨型滑坡、隐火山口结构、磁异常和构造

IF 3.1 2区地球科学

Geomorphology Pub Date : 2025-05-18 DOI: 10.1016/j.geomorph.2025.109845

Maurizio M. Torrente, Alfonsa Milia

引用次数: 0

Quaternary fluvial archives from Asian rivers: Reflections of tectonic activity, crustal processes and climatic variation 亚洲河流的第四纪河流档案：构造活动、地壳过程和气候变化的反映

IF 3.1 2区地球科学

Geomorphology Pub Date : 2025-05-17 DOI: 10.1016/j.geomorph.2025.109841

David Bridgland , Zhenbo Hu , Zijuan Dong , Xiaohua Li , Yiorgos Galanis , Chris Orton

{"title":"Quaternary fluvial archives from Asian rivers: Reflections of tectonic activity, crustal processes and climatic variation","authors":"David Bridgland , Zhenbo Hu , Zijuan Dong , Xiaohua Li , Yiorgos Galanis , Chris Orton","doi":"10.1016/j.geomorph.2025.109841","DOIUrl":"10.1016/j.geomorph.2025.109841","url":null,"abstract":"<div><div>This paper reviews the fluvial archives from selected Asian rivers, exploring the extent to which they inform about the influences upon fluvial evolution of tectonic activity, crustal processes and patterns of climatic change. The drainage systems selected for review include examples of different size and in different parts of the continent, the criterion for selection being recent research undertaken on them that has provided updated data on their fluvial archives. Patterns revealed include a strong record of uplift from SW Asia: Anatolia, the Levant and Mesopotamia; in the last two of these regions the fluvial archives incorporate important evidence for early human occupation. Rivers flowing over cratonic crust across Siberia to the Arctic Ocean lack evidence for progressive uplift but can still reveal long-timescale fluvial archives; they can also represent important contexts for regional archaeological records, as well as for palaeontology. The largest Asian rivers include those draining from the Himalayan–Tibetan uplands, where the drainage has evolved alongside the World's most extreme recent orogenesis. They record complex reorganization of drainage, including the diversion of the Yarlung Tsangpo from the Irrawaddy to the Brahmaputra and of the Yangtze from the Red River. The Yellow River, meanwhile, has been formed from the progressive capture of formerly endorheic basins on the Tibetan Plateau, while drainage at the northern edge of the Tibetan Plateau has evolved in response to recently uplifted mountain chains. The selected examples provide insight into the interaction of tectonic, epeirogenic and climatic influences on fluvial evolution and associated palaeoenvironments.</div></div>","PeriodicalId":55115,"journal":{"name":"Geomorphology","volume":"484 ","pages":"Article 109841"},"PeriodicalIF":3.1,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124524","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}

引用次数: 0

Transition of predominant regional tectonics to global climate forcing for Asian summer monsoons at ~7.2 Ma 约7.2 Ma亚洲夏季风的主导区域构造向全球气候强迫的转变

IF 3.1 2区地球科学

Geomorphology Pub Date : 2025-05-17 DOI: 10.1016/j.geomorph.2025.109840

Peng Gao , Xiaoxue Wang , Haoqi Chen , Yixin Chen , Yifan Hua , Junsheng Nie

{"title":"Transition of predominant regional tectonics to global climate forcing for Asian summer monsoons at ~7.2 Ma","authors":"Peng Gao , Xiaoxue Wang , Haoqi Chen , Yixin Chen , Yifan Hua , Junsheng Nie","doi":"10.1016/j.geomorph.2025.109840","DOIUrl":"10.1016/j.geomorph.2025.109840","url":null,"abstract":"<div><div>Much has been known regarding late Neogene East Asian summer monsoon (EASM) history and potential forcing mechanisms due to the existence of late Neogene loess deposits on the Chinese Loess Plateau. No continuous loess deposits exist in South Asian monsoon region, and many studies infer South Asian summer monsoon (SASM) variations mainly from low-elevation marine or fluvio-lacustrine sediments. However, inconsistent viewpoints emerge regarding the evolution of the SASM from the late Miocene to the Pleistocene and the potential forcing mechanisms based on these sediments. Here we present an SASM record derived from environmental magnetic parameter in late Neogene fluvio-lacustrine strata from the high-elevation Zhada Basin in southern Tibet. The results show the SASM experienced four stages of variations over the late Miocene to the early Pleistocene, with stronger monsoon precipitation corresponding to warmer climate after ~7.2 Ma. However, SASM intensification prior to ~7.2 Ma was contrary to effects of global climate variations, which we attributed to thermal and mechanical effects of the northeastward growth of the Tibetan Plateau on the SASM. A comparison with the EASM records suggests that the EASM also experienced a transition of dominant driving forcing from the Tibetan Plateau uplift to global climate at ~7.2 Ma, with the exception of the interval 4.5–2.7 Ma when the EASM intensification was controlled by regional tectonics (possibly closure of the Panama Seaway). This study clarifies evolution history of the Asian summer monsoons and recognizes their main forcing mechanisms since 10 Ma.</div></div>","PeriodicalId":55115,"journal":{"name":"Geomorphology","volume":"484 ","pages":"Article 109840"},"PeriodicalIF":3.1,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144088912","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}

引用次数: 0