Global and Planetary Change最新文献

{"title":"Drainage reorganization near the eastern margin of the Tibetan Plateau as a result of fluvial response to differential uplift enhanced by isostatic compensation","authors":"Qinhong Mo ,&nbsp;Zhenbo Hu ,&nbsp;David Bridgland ,&nbsp;Menghao Li ,&nbsp;Baotian Pan ,&nbsp;Zijuan Dong ,&nbsp;Xiaohua Li ,&nbsp;Meiling Zhong ,&nbsp;Renzhe Pan ,&nbsp;Ningyi Li ,&nbsp;Rob Westaway","doi":"10.1016/j.gloplacha.2025.105052","DOIUrl":"10.1016/j.gloplacha.2025.105052","url":null,"abstract":"<div><div>Drainage reorganization is affected by the relationships between tectonically driven rock uplift, climatically modulated denudation, and isostatic (atectonic) compensation, conveying signals of tectonic and climatic changes into processes of landscape evolution. Drainage-divide migration as a marker of drainage reorganization is a key to understanding these processes; however, previous studies on the differential rock uplift seem to have overlooked the contributions from surface erosion and isostatic compensation, due to a lack of natural archives for further verification. We have therefore conducted a combined study of geomorphological indices and natural records to categorize a remarkable case of drainage-divide migration between the Jialing and Min rivers near the eastern margin of the Tibetan Plateau, characterized by active tectonic deformation and significant spatial difference in denudation. Reconstruction of this drainage change is based on multiple geomorphological indices, including normalized channel steepness and χ-map, in combination with constraining the timing of drainage-divide migration to &lt;11.1 ka, using cosmogenic radionuclide exposure dating. Our results attribute divide migration at the eastern margin of the Tibetan Plateau primarily to differential tectonic uplift, which may have been further enhanced by isostatic compensation in response to uneven distribution of denudation induced by differences in precipitation and landslides, thus implying the coupling between crustal processes and climate in driving landscape evolution.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 105052"},"PeriodicalIF":4.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144988388","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":"Sensitivity of ground-level ozone to surface elevation in CMIP6: Role of stratosphere-troposphere exchange","authors":"Yingli Niu,&nbsp;Yetong Li,&nbsp;Yan Xia,&nbsp;Fei Xie","doi":"10.1016/j.gloplacha.2025.105054","DOIUrl":"10.1016/j.gloplacha.2025.105054","url":null,"abstract":"<div><div>Ground-level ozone, a critical air pollutant affecting human health and ecosystems, exhibits significant correlation with surface elevation. Using CAMS reanalysis and CMIP6 historical simulations, this study quantifies the surface elevation-dependent sensitivity of ground-level ozone across the Northern Hemisphere (NH). Reanalysis results reveal that ground-level ozone in the NH mid- and high-latitudes is sensitive to surface elevation, with ozone increasing at rates of 1.85 and 6.06 ppbv/km, respectively. Particularly, high-elevation regions such as the Tibetan Plateau and Greenland exhibit significant elevation dependence with rates of 5.21 (<em>r</em> = 0.81) and 4.57 ppbv/km (<em>r</em> = 0.78), respectively, likely due to more efficient stratosphere-troposphere exchange (STE). CMIP6 models generally capture this surface elevational sensitivity, though with different ozone increase rates of 2.5 and 2.7 ppbv/km in NH mid- and high-latitude for the multi-model mean. It is found that ‌STE-driven ozone explains 38 % and 37 % of the variability in NH mid- and high-latitude, respectively, where surface elevation acts as a ‌“STE enhancer” by compressing the vertical distance for stratospheric intrusion. Notable inter-model disparities of the contribution from STE emerge, with IPSL-CM5A2-INCA exhibiting minimal elevational sensitivity (0.01 ppbv/km). Excluding this outlier elevates STE's contribution to 46 %. These findings highlight ‌surface elevation-specific ozone response rates‌ critical for air quality management in mountainous and plateau regions and underscore the need to refine STE parameterizations in climate-chemistry models.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 105054"},"PeriodicalIF":4.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144931869","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 controls and threshold effects on carbon isotope excursions during the Toarcian Oceanic Anoxic Event","authors":"Wenqiang Tang ,&nbsp;Chao Ma ,&nbsp;Yuyuan Liu ,&nbsp;Songtao Wu ,&nbsp;Yucong Li ,&nbsp;Kun He ,&nbsp;Kai Yu ,&nbsp;Longgang Ye ,&nbsp;Mingcai Hou ,&nbsp;Daowei Zhang","doi":"10.1016/j.gloplacha.2025.105050","DOIUrl":"10.1016/j.gloplacha.2025.105050","url":null,"abstract":"<div><div>During the Toarcian, Early Jurassic, the Earth experienced a global carbon cycle perturbation associated with global warming and widespread oceanic anoxia, known as the Toarcian Oceanic Anoxic Event (T-OAE). Carbon isotope data from oceans and land around the world record a clear negative excursion (ranging from ~2 ‰ to 8.5 ‰). However, the factors controlling the differences in the magnitude of this negative carbon isotope excursion (CIE) are still unclear, and there are many different explanations for the different durations of the Toarcian negative CIE. This study compiled nine high-resolution marine boreholes and sections data from Western Tethys Ocean and two continental drill hole data from the Eastern Tethys region. Through cyclostratigraphic analysis, it was found that the duration of the negative CIE was ~350–1800 kyr. In addition, by combining power decomposition analysis (PDA) with machine learning methods, it is believed that long eccentricity and precession affect the changes in carbon isotope characteristics during T-OAE, but there may be a threshold effect in the driving process. When the long eccentricity/precession is below the threshold, or even within a certain range, the stronger the effect of the orbital cycle, the longer duration of the negative CIE, and the greater the magnitude of the excursion. This study enriches the terrestrial records in T-OAE research and deeply explores the impact of different factors on the Early Jurassic oceanic anoxic event, which is of great significance for understanding the impact mechanism of oceanic anoxic events.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 105050"},"PeriodicalIF":4.0,"publicationDate":"2025-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144996388","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":"Response of land plants to the Toarcian Oceanic Anoxic Event: Palynology of a Pliensbachian–Toarcian section from the Rodiles Formation at Lastres (Asturias, NW Spain)","authors":"Samuel F. Rial ,&nbsp;Artai A. Santos ,&nbsp;Sam M. Slater ,&nbsp;Iván R. Barreiro ,&nbsp;Laura Piñuela ,&nbsp;José Carlos García-Ramos ,&nbsp;José B. Diez","doi":"10.1016/j.gloplacha.2025.105047","DOIUrl":"10.1016/j.gloplacha.2025.105047","url":null,"abstract":"<div><div>During the early Toarcian (∼183 million years ago), massive amounts of greenhouse gases were liberated due to volcanic activity in the Karoo-Ferrar large igneous province. One of the consequences of this volcanic activity was the Toarcian Oceanic Anoxic Event (T-OAE), which is recorded as a negative δ¹³C_org excursion in sedimentary accumulations of organic matter in different deposits worldwide. This event impacted marine ecosystems, causing changes to planktonic and benthic communities and a loss of diversity in the marine realm. However, responses of terrestrial ecosystems remain uncertain. Here, a comprehensive palynological study was carried out on the Rodiles Formation, Lastres (Asturian Basin, NW Spain), aiming to describe palynological assemblages, reconstruct plant communities, detect vegetation changes, and discuss potential ecological consequences. Significant changes in the composition of terrestrial plant communities and marine plankton communities were recorded, where dinoflagellate cysts were missing through the T-OAE interval. The prevalence of Cheirolepidiaceae-dominated forests before the T-OAE suggests dry and semiarid conditions, followed by a transition to fern-dominated plant communities during the T-OAE, suggesting increased humidity or seasonality. After the T-OAE, Cheirolepidiaceae forests recovered, indicating a return to drier climates and tree-dominated communities. These findings enhance our understanding of the complex relationship between climate, environment, and terrestrial ecosystems during this event, providing the first record of the terrestrial response to the T-OAE from the Northern Iberian plate.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 105047"},"PeriodicalIF":4.0,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145004320","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":"Predominant East Asian summer monsoon control on clay-sized fraction lithium isotope ratios in Red Clay deposits on the Chinese Loess Plateau","authors":"Xueping Ren ,&nbsp;Li Xing ,&nbsp;Benhong Guo ,&nbsp;Xueqin Yang ,&nbsp;Fengtai Tong ,&nbsp;Yilin Xiao ,&nbsp;Junsheng Nie","doi":"10.1016/j.gloplacha.2025.105045","DOIUrl":"10.1016/j.gloplacha.2025.105045","url":null,"abstract":"<div><div>The Li isotope composition (δ⁷Li) of terrestrial sediments is a promising tracer for extracting past chemical weathering and environmental changes, but the relative importance of precipitation versus temperature effects on δ⁷Li remains poorly constrained. Here, we present bulk and clay-sized fraction δ⁷Li data for a Red Clay sequence from the Chaona section on the central Chinese Loess Plateau (CLP), and compare the results with magnetic parameter-based temperature and precipitation records. We find that, from the late Miocene onwards, the clay-sized fraction δ⁷Li record corresponds well with magnetic precipitation proxy records but not with temperature proxy records. This pattern suggests that changes in precipitation exert a primary control on clay-sized fraction δ⁷Li variations. Bulk δ⁷Li in the Chaona section shows an approximately similar decreasing trend to that of clay-sized fraction δ⁷Li from the late Miocene to mid-Pliocene, consistent with precipitation records. In contrast, bulk δ⁷Li variations display an inverse trend compared with clay-sized fraction δ⁷Li and precipitation records during the late Pliocene, which we attribute to intensified winter monsoon and provenance shifts. Our findings demonstrate that clay-sized fraction δ⁷Li in sediments can serve as a reliable indicator to reconstruct past precipitation changes on the CLP on million year timescales.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 105045"},"PeriodicalIF":4.0,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144925441","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":"Iron isotope variability in the suspended load across the Changjiang (Yangtze) River basin: The tally of source and weathering contributions","authors":"Zhiwei He ,&nbsp;Ana Cristina Vasquez ,&nbsp;Junjie Guo ,&nbsp;Ni Su ,&nbsp;Juan Xu ,&nbsp;Dongyong Li ,&nbsp;Simon V. Hohl ,&nbsp;Shouye Yang","doi":"10.1016/j.gloplacha.2025.105046","DOIUrl":"10.1016/j.gloplacha.2025.105046","url":null,"abstract":"<div><div>Iron isotopes are increasingly used to trace the sources and biogeochemical cycling of Fe in Earth's surface environments. Despite the recognized significance of riverine input of Fe to the primary productivity throughout the oceans, uncertainties remain over the riverine Fe sources and fractionation of Fe isotopes. This study presents the first dataset on Fe isotope compositions in Suspended Particulate Matter (SPM) of the Changjiang (Yangtze) mainstream and its major tributaries, from its headwater on the Tibetan Plateau to its estuary, aiming to better determine the sources of Fe-bearing particles and to explore the relationship of particulate Fe isotopic variation with weathering regimes across watershed spatial scales.</div><div>Our results demonstrate that the suspended load (&gt;0.45 μm) transports approximately 99 % of the total riverine Fe budget along the course of the Changjiang River, with δ⁵⁶Fe values ranging from −0.15 to 0.16 ‰, which are either lower than or comparable to those of the Upper Continental Crust (UCC; ∼0.1 ‰). The strong positive correlation between Fe and Al, along with the negative correlation between Fe and Ca concentrations in SPM, highlights the presence of Fe in close association with clay-rich aluminosilicate minerals. The data suggest that provenance rock types are not the dominant factor causing spatial SPM δ⁵⁶Fe variation. Furthermore, evidence from Fe and Zn enrichment factors (relative to Al) and their relationships with δ⁵⁶Fe in SPM indicates minimal anthropogenic Fe inputs. Rather, the spatial variability of δ⁵⁶Fe in SPM more likely reflects changes in weathering regimes and intensities under varying climatic conditions, as supported by the relationship between δ⁵⁶Fe and the Chemical Index of Alteration (CIA) weathering proxy. Specifically, in the mountainous headwaters and upper reaches, characterized by a cold, dry alpine climate, we observe slightly negative δ⁵⁶Fe values at close to −0.1 ‰, with minimal variation relative to CIA values, reflecting the dominance of a weathering-limited regime. In contrast, in the mid-to-lower reaches, under a warm, humid climate, a positive correlation between δ⁵⁶Fe and CIA is observed, consistent with the progressive loss of isotopically light Fe during chemical weathering. A global assessment of SPM δ⁵⁶Fe across different rivers suggests significant variability in the isotopic signatures of riverine particulate Fe delivered to the oceans, driven primarily by climate and its influence on weathering regimes. Altogether, our new data demonstrate the robustness of Fe isotopes as tracers of Fe sources and fractionation processes in large river systems, providing crucial insights into the links between continental weathering, climate change, and the riverine Fe cycle.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 105046"},"PeriodicalIF":4.0,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144988387","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":"Possible influences of tropical vegetation shift on the glacial-interglacial temperature changes","authors":"Liping Tian ,&nbsp;Cong Chen ,&nbsp;Mengyuan Wang ,&nbsp;Chuanxiu Luo ,&nbsp;Xiao Zhang ,&nbsp;Yanming Ruan ,&nbsp;Jiantao Cao ,&nbsp;Meiling Man ,&nbsp;Zhuo Zheng ,&nbsp;Xiaoqiang Yang ,&nbsp;Kangyou Huang ,&nbsp;Li Li ,&nbsp;Guodong Jia","doi":"10.1016/j.gloplacha.2025.105043","DOIUrl":"10.1016/j.gloplacha.2025.105043","url":null,"abstract":"<div><div>The feedback mechanism between climate and vegetation has attracted considerable attention, but there are large uncertainties about the influence of terrestrial vegetation on climate, especially in paleoclimate studies. Here, we reconstruct a quantitative temperature record from the Tianyang Maar Paleolake in tropical East Asia over the past 150 kyr, by using a state-of-the-art regression model and the expanded global branched glycerol dialkyl glycerol tetraethers database (<em>n</em> = 3614). The record shows a change amplitude of 4–5 °C during the glacial-interglacial cycles, about 1–2 °C higher than the sea surface temperature in the adjacent South China Sea. Temperature and pollen data from the same sediment core indicated the replacement of forest by savanna landscape along with relatively high insolation and CO₂ concentrations, probably caused two abnormal warm stages at 154–139 and 99–85 cal ka BP, by altering the surface evapotranspiration and roughness. Furthermore, the alternating occurrence of savanna replacing forest may have strengthened the precession signal (23 kyr) relative to the obliquity signal (41 kyr). Our study highlights the impacts of vegetation feedback on orbital-scale climate evolution and emphasizes the importance of reforestation in tropical regions with ongoing global warming.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 105043"},"PeriodicalIF":4.0,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144996389","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":"Aptian sequences, sea-level, siliciclastic flux and climate change in the Neo-Tethys domain (Tunisia, N. Spain and S. France)","authors":"Najeh Ben Chabaane ,&nbsp;Jihede Haj Messaoud ,&nbsp;Fares Khemiri ,&nbsp;Frans van Buchem","doi":"10.1016/j.gloplacha.2025.105049","DOIUrl":"10.1016/j.gloplacha.2025.105049","url":null,"abstract":"<div><div>A carbonate platform to basin transect of the Aptian succession has been constructed using outcrop sections in central Tunisia. Constrained by new biostratigraphic information and a new C-isotope curve a high-resolution sequence stratigraphic model is proposed. It is compared to three reference sections along the Northern Tethyan margin in order to evaluate the timing of the Aptian sequences and sedimentation patterns at the Neo-Tethys scale.</div><div>The Tunisian sections, which vary in thickness from 130 m in the inner platform to 850 m in the basin margin, display a rich variation in carbonate, siliciclastic and evaporite sedimentary facies. In the inner platform domain three significant stratigraphic hiatuses have been detected, whereas the basin margin section is complete, and comprises an 80 m thick siliciclastic/oolitic lowstand wedge deposited during the early late Aptian sealevel fall. This fall also marks the abrupt influx of continent-derived siliciclastics. Comparison of the Tunisian section to an equally extended basin margin section in northern Spain (Aralar platform), and basinal sections in southern France (Vocontian Basin) and southeastern Spain (Cau section), show a strikingly similar sequence stratigraphic organization at two orders. At the large scale, two supersequences can be correlated, of which the first one spans the early Aptian to the early part of the late Aptian, and is dominated by shales (including the OAE 1a), carbonates and evaporites. The second-order supersequence covers the remaining part of the late Aptian and earliest Albian and is characterized by a lowstand wedge caused by a eustatic sea-level drop of approx. 60-70 m, accompanied by a strong, basinwide, influx of siliciclastics around the Neo-Tethys Ocean. At the medium scale, six third-order sequences can be correlated across the Neo-Tethys domain.</div><div>The 2nd order lowstand wedge and siliciclastic influx are time equivalent with the coldest temperatures reported for the late Aptian, and coincide with the establishment of the Equatorial Humid Belt, all supporting a dramatic late Aptian climate change. The onfollowing overall transgression is co-eval with a gradual rise in temperatures, punctuated by short hyperthermal events. These events are locally expressed by the accumulation of organic matter (Jacob, Kilian, Paquier levels) and occur during the transgressions of the 3rd order sequences, interpreted here as the expression of a pulsed melting of the ice caps that caused the initital 2nd order sea level fall.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"255 ","pages":"Article 105049"},"PeriodicalIF":4.0,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145093932","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":"Analysis of temporal trends and spatial distributions in top-of-atmosphere shortwave radiation based on multiple datasets from satellites observations, reanalyses, and climate models","authors":"Yueming Zheng ,&nbsp;Tao He ,&nbsp;Yichuan Ma","doi":"10.1016/j.gloplacha.2025.105040","DOIUrl":"10.1016/j.gloplacha.2025.105040","url":null,"abstract":"<div><div>Understanding the spatiotemporal patterns of global net shortwave radiation at the top-of-atmosphere is crucial for studying Earth's energy budget and associated radiative forcing from natural or anthropogenic events. However, the differences across datasets can result in divergent or even contradictory conclusions regarding radiation variability, making it difficult to accurately assess and project climate change based on any single dataset. This paper comprehensively evaluates and intercompares the spatiotemporal variation and trends of 25 radiation datasets from satellite observations, reanalyses and climate models. Using Clouds and the Earth Radiant Energy System Energy Balanced and Filled (CERES EBAF) as the reference, which maintains stable annual means of ∼241 ± 1 W m⁻² from 2003 to 2014, CM SAF cLoud, Albedo and Radiation dataset (CLARA) and Fifth Generation ECMWF Reanalysis (ERA5) exhibit the most similar annual mean variations. Satellite-based and some reanalysis products reproduce the spatial patterns well over most regions, but large deviations (up to ∼50 W m⁻²) remain in regions dominated by marine stratocumulus and convective clouds. Decomposition of reflected radiation reveals that atmospheric reflection dominates the total bias, with compensatory effects between atmospheric and surface components being particularly pronounced in high-latitude regions. CERES EBAF exhibits increasing trend in global annual mean net shortwave radiation of 0.12 W m⁻² per decade during 2003–2014, equivalent to the cumulative radiative forcing from ∼160 Gt of CO₂ emissions. Similar interannual trends are consistently observed across EBAF, CLARA, and ERA5 datasets, with a pronounced positive trend over parts of the western Pacific warm pool (∼2.19 W m⁻² yr⁻¹) and a negative trend over portions of the Maritime Continent and South Pacific (∼ −1.98 W m⁻² yr⁻¹). In contrast, climate models and some reanalyses datasets exhibit substantial discrepancies, primarily driven by biases in the trends of atmospheric reflection, while deviations in surface reflection trends are more evident in high-latitude regions. Overall, this findings have implications for improving climate models and enhancing the understanding of the Earth's energy balance in response to climate change.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"255 ","pages":"Article 105040"},"PeriodicalIF":4.0,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145061396","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":"Sediment provenance and weathering in the northern South China Sea and its implications for climate change and sea-level fluctuations over the past 140 kyr","authors":"Lingling Xu ,&nbsp;Li Wu ,&nbsp;Shiqiao Liu ,&nbsp;Liang Chen ,&nbsp;Chenglong Wei ,&nbsp;Fangjian Xu","doi":"10.1016/j.gloplacha.2025.105042","DOIUrl":"10.1016/j.gloplacha.2025.105042","url":null,"abstract":"<div><div>Marine sediments contain valuable records of climate change and land-sea interactions. Numerous studies have investigated sediments from the northern South China Sea; however, research on the deep-sea basin southwest of this region remains limited. In this study, we analyze the major and trace elements of sediments collected from the eastern ridge of the Xisha Islands to identify their provenance and examine their responses to climate change over the past 140 kyr. The results indicate that sediments primarily originated from southwestern Taiwan and the Pearl River, with their relative contributions modulated by sea-level fluctuations on glacial-interglacial timescales. During glacial periods, Taiwan Island and the Pearl River contributed approximately 42 % and 58 %, respectively, to the total terrigenous input. During interglacial and intermediate climate periods, their contributions were approximately 52 % and 47 %, respectively. Our findings suggest that the East Asian summer monsoon strongly influenced the chemical weathering of surrounding source regions, although this effect is primarily evident in sediments deposited when the sea level was above −50 m. In contrast, the enhanced weathering intensity observed during glacial periods is attributed to secondary weathering processes at sea levels below −50 m. This study highlights the interplay between sea-level fluctuations, climate change, and chemical weathering processes, offering new insights into the influence of climate change on deep-sea sedimentation.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 105042"},"PeriodicalIF":4.0,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144907993","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}