Global and Planetary Change最新文献

{"title":"Predicting the potential geographical distribution of peatlands in Northeast China based on the ensemble model","authors":"Haobo Wu ,&nbsp;Zhongsheng Zhang ,&nbsp;Zhenshan Xue ,&nbsp;Wenwen Zhao ,&nbsp;Luan Sang ,&nbsp;Haitao Wu ,&nbsp;Wenfeng Wang ,&nbsp;Qiang Guan ,&nbsp;Kangle Lu","doi":"10.1016/j.gloplacha.2025.104866","DOIUrl":"10.1016/j.gloplacha.2025.104866","url":null,"abstract":"<div><div>Peatlands are vital carbon sinks and unique ecosystems which are highly sensitive to global climate change. Predicting their spatial distribution under current and future climate scenarios is essential for effective conservation and management. In this study, we developed an ensemble model using multiple algorithms to predict the dynamic distribution of suitable peatland areas in Northeast China under current and future climate conditions. The ensemble model demonstrated strong performance, achieving Area Under the Curve (AUC) of 0.937 and True Skill Statistic (TSS) of 0.828. Our results indicate that the current suitable peatland area in Northeast China is 97,100 km². These areas are primarily located in the valleys and along the riverbanks of the Greater Khingan Mountain Region and the Changbai Mountains Region, with relatively fewer suitable areas in the Lesser Khingan Mountain Region and the Sanjiang Plain. Under future climate change, peatlands in Northeast China face a significant risk of degradation, especially under the high emission SSP585 scenario. Climate factors, especially the mean diurnal temperature range and the max temperature of the warmest month, have a significant impact on the distribution of suitable peatland areas. Additionally, factors such as soil pH, the freeze-thaw process, topography, and regional water retention capacity also play crucial roles in determining peatland suitability. Our findings provide an important foundation for better management and sustainable development of peatland resources.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"252 ","pages":"Article 104866"},"PeriodicalIF":4.0,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143900340","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":"Stability up until the end: Disruption, recovery and the latest Permian nitrogen cycle at Penglaitan, China","authors":"Shane D. Schoepfer ,&nbsp;Eldridge Machen II ,&nbsp;Hannah Cothren ,&nbsp;Lei Xiang ,&nbsp;Hua Zhang","doi":"10.1016/j.gloplacha.2025.104868","DOIUrl":"10.1016/j.gloplacha.2025.104868","url":null,"abstract":"<div><div>Negative organic sedimentary nitrogen isotope excursions are a common feature of sedimentary records spanning the end-Permian mass extinction (EPME). These excursions likely reflect global-scale perturbations of the marine nitrogen cycle. However, most EPME sections offer too little stratigraphic resolution to assess the timing, nature, and local ecological impacts of these disruptions. The Penglaitan Northern Bank section in Guangxi, China, offers an opportunity to explore the end-Permian nitrogen cycle in over 600 m of Changhsingian strata deposited in marginal marine environments of the Nanpanjiang Basin. The succession contains numerous volcanogenic sandstones and crystalline tuffs, defining a pattern of disruption and recovery on ecological timescales that can be compared to the more impactful biogeochemical changes associated with the EPME.</div><div>Organic carbon and nitrogen isotopes in the Penglaitan Northern Bank section are stable throughout the majority of the Changhsingian, with nitrogen isotope values consistent with a background ‘greenhouse’ climate nitrogen cycle. This stability in the nitrogen cycle is interrupted by the latest Permian transgression, beginning at 252.0 Ma. During the transgression, nitrogen isotope values become considerably more variable, ranging from negative values indicative of N fixation in an oligotrophic environment to more enriched values reflecting the incursion of anoxic, denitrifying waters. Nitrogen isotope values in the earliest Triassic stabilize, but remain lower than the Changhsingian baseline. The negative δ¹⁵N excursions seen in other sections globally likely represent condensed expressions of the more complex nitrogen cycle processes revealed at Penglaitan.</div><div>At Penglaitan, δ¹⁵N instability precedes the paleontologically defined extinction at the EPME and demonstrates that changes to marine biogeochemical cycles were diachronous with respect to local species extinctions, which may have been proximally driven by local volcanism and facies changes. While unstable nutrient cycles may have stressed marine ecosystems in the latest Changhsingian, they did not immediately push these communities beyond their ability to recover from episodic disturbance by volcanism.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"252 ","pages":"Article 104868"},"PeriodicalIF":4.0,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143900294","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 proportion of labile REEs in the river sediments serves as an index for silicate weathering intensity","authors":"Yulong Guo ,&nbsp;Yalong Li ,&nbsp;Shouye Yang","doi":"10.1016/j.gloplacha.2025.104863","DOIUrl":"10.1016/j.gloplacha.2025.104863","url":null,"abstract":"<div><div>Weathering indices derived from bulk sediment geochemistry are inevitably affected by inherited signatures from recycled sedimentary rocks. Therefore, characterizing and evaluating the impacts of sedimentary recycling becomes critically important. The proportion of labile REEs in river sediments holds promise in meeting this requirement. This is because the presence of labile REEs are primarily influenced by processes associated with present-cycle weathering, including the release of REEs through the dissolution of primary REE-bearing minerals, the formation of secondary minerals, and the simultaneous adsorption of REEs. Sediments from small catchments in Southeast China, featuring diverse climatic, geological settings, and weathering regimes, are utilized to establish and validate this potential weathering index.The chemical labile fractions of sediment samples were separated by 1 N HCl leaching. For sediments from catchments in Southeast mainland China, characterized by Mesozoic granitoid source rocks, the proportions of labile REEs are notably high, ranging from 32 % to 82 %, and show a significant positive correlation with CIA values. The main hosts for the labile REEs in these sediments are absorbed phase by clay minerals and/or Fe<img>Mn (hydro)oxides. In contrast, for sediments from the Zhuoshuixi catchment in Taiwan, which originate from recycled sedimentary and metasedimentary rocks, the proportions of labile REEs are much lower, around 8 %, and exhibit a negative correlation with CIA values. In these sediments, the dissolution of MREE-bearing minerals is likely the main source of labile REEs. Compared to weathering indices based on bulk sediment geochemistry, the proportion of labile REEs can indicate weathering intensity over a broader range of W/D values and can largely avoid interference from sedimentary recycling. Overall, our results reaffirm that earth surface processes, including chemical weathering and hydrodynamic sorting, may effect the REE distribution in the labile phase and even the bulk sediment. This factor must be fully considered when using REEs as sediment provenance tracers.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"252 ","pages":"Article 104863"},"PeriodicalIF":4.0,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143894702","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":"Benzo[ghi]fluoranthene and benz[a]anthracene as potentially useful wildfire temperature indicators","authors":"Leszek Marynowski ,&nbsp;Dorota Staneczek ,&nbsp;Maria Barbacka ,&nbsp;Grzegorz Pacyna","doi":"10.1016/j.gloplacha.2025.104846","DOIUrl":"10.1016/j.gloplacha.2025.104846","url":null,"abstract":"<div><div>Polycyclic aromatic hydrocarbons (PAHs), along with charcoal, are key indicators of wildfires in the geological record. This study explores the distribution of PAHs in charcoal and fusinite-rich sedimentary rocks from the Late Triassic and Early Jurassic periods. During the Upper Triassic, conifers were the main source of biomass for forest fires. In contrast, in the Lower Jurassic, almost all main plant groups could provide fuel for wildfires including lycopsids, horsetails, ferns, cycads, bennettitaleans, ginkgoaleans, and conifers. For the Upper Triassic, fire temperatures ranged widely from 272 °C to 742 °C, which includes ground, surface, and crown fires. Regarding the Lower Jurassic fires, the range of measured temperatures was smaller, from 251 °C to 451 °C, corresponding to ground and surface fires. As expected, the reflectance of fusinite correlates well with total organic carbon for charcoals (R² = 0.52) apart from a few outliers that lower the correlation. By analysing the correlation between the benzo[<em>ghi</em>]fluoranthene (B[<em>ghi</em>]Fl) to benz[<em>a</em>]anthracene (B[<em>a</em>]A) ratio and fusinite reflectance, a new method for estimating wildfire temperatures was developed. The B[<em>ghi</em>]Fl/(B[<em>ghi</em>]Fl + B[<em>a</em>]A) ratio exhibits a robust correlation (R² = 0.62) with fire temperatures calculated from fusinite reflectance. A novel formula for calculating wildfire temperatures was proposed, offering a valuable proxy complementary to fusinite reflectance. The results obtained are related to the higher thermal stability of B[<em>ghi</em>]Fl compared to B[<em>a</em>]A, making this ratio a reliable indicator of combustion temperature. The use of PAHs to determine the temperature of wildfires should be limited to unweathered rocks, as B[<em>a</em>]A is rapidly oxidised. Further research is needed to verify the application of this indicator in other sedimentary basins.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"252 ","pages":"Article 104846"},"PeriodicalIF":4.0,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904592","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":"An assessment of the Pliocene as an analogue for our warmer future","authors":"Lauren E. Burton ,&nbsp;Arthur M. Oldeman ,&nbsp;Alan M. Haywood ,&nbsp;Julia C. Tindall ,&nbsp;Aisling M. Dolan ,&nbsp;Daniel J. Hill ,&nbsp;Anna von der Heydt ,&nbsp;Michiel L.J. Baatsen","doi":"10.1016/j.gloplacha.2025.104860","DOIUrl":"10.1016/j.gloplacha.2025.104860","url":null,"abstract":"<div><div>The Pliocene has been considered a possible palaeoclimate analogue for over four decades and is often referred to as the “best” analogue for the end-of-century future. Using elements of a newly proposed palaeoclimate analogy framework, we critically assess the Pliocene as an analogue for our warmer future using data from the Pliocene Model Intercomparison Project (PlioMIP) and Shared Socioeconomic Pathway (SSP) scenarios from the Sixth Assessment Report (AR6) of the Intergovernmental Panel on Climate Change (IPCC). Three future intervals are considered: near term (2021–2040), medium term (2041–2060), and long term (2081–2100).</div><div>The strength of the Pliocene as an analogue is found to be highly dependent on a number of factors, including the climate variable and the spatial and temporal scales of interest. Warming under medium emission scenarios (SSP2-4.5 and SSP3-7.0) by the end of this century is found to be the most analogous to the Pliocene, though there is significant variation both between models and between regions on the level of analogy. While increases in Pliocene surface air temperature are found to be analogous to some future scenarios, changes in precipitation are less analogous between the Pliocene and projected futures, particularly in terms of the spatial patterns of change. Using sensitivity experiments, we show that the regions of greatest difference between the Pliocene and projected future(s) are largely attributable to non-CO₂ Pliocene boundary conditions, such as reduced land ice and closed Arctic Ocean gateways.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"252 ","pages":"Article 104860"},"PeriodicalIF":4.0,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144138582","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":"Variability of microbial network complexity and stability along the size-fraction particles in the global ocean","authors":"Ting Gu ,&nbsp;Zhuo Chen ,&nbsp;Jun Sun","doi":"10.1016/j.gloplacha.2025.104859","DOIUrl":"10.1016/j.gloplacha.2025.104859","url":null,"abstract":"<div><div>Marine sinking particles serve as hotspots for microbial colonization and activity, with diverse microbes co-consuming particulate organic matter (POM) to recover essential nutrients. However, the interaction patterns between such diverse and complex microbial communities and its possible impact on the marine biological carbon pump (BCP) remains unclear. Here we analyze snapshots of microbial community composition on marine particles with different particle sizes collected during the Malaspina 2010 Expedition. We found that large sinking particle-attached microbial communities showed lower networks complexity and robustness, but stronger compositional stability. These communities were significantly enriched in organic carbon degradation functional genes, indicating its key role in the initial phases of carbon flux attenuation. These patterns are likely driven by strong homogeneous environmental selection and weak dispersal limitation, which lead to niche overlap, intensified negative interactions, and competitive exclusion among particle-attached microbes. We propose the hypothesis of “large particle eutrophication”, which indicates that the enrichment of bioavailable organic matter in large sinking particles promotes competitive microbial interactions, which allow only microorganisms with specific metabolic functions to colonize, leading to stronger compositional stability. Our results highlight the key ecological role of microbial community structure in regulating the carbon sink process, providing new theoretical support and ecological perspectives for understanding the marine carbon cycle.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"252 ","pages":"Article 104859"},"PeriodicalIF":4.0,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143882975","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 role of atmospheric and oceanic factors on the record low Antarctic sea ice extent of 2023","authors":"M. Swathi ,&nbsp;Avinash Kumar ,&nbsp;Juhi Yadav ,&nbsp;Rahul Mohan","doi":"10.1016/j.gloplacha.2025.104858","DOIUrl":"10.1016/j.gloplacha.2025.104858","url":null,"abstract":"<div><div>In February 2023, the Antarctic Sea ice extent (SIE) reached a historic low of 1.7 million km², which was 43 % lower than the monthly average extent recorded since 1979. This marked the second consecutive year of record lows, surpassing the minimum SIE from the previous year. Our study aims to understand the atmospheric and oceanic factors from September 2022 to August 2023 that contributed to these new lows. Throughout the study period, the monthly SIE consistently indicated lower extents compared to the long-term average. The Weddell Sea and Amundsen-Bellingshausen Sea (ABS) experienced the most decline in austral spring and summer, respectively, while the Ross Sea showed the minimum sea ice loss. The lower stratospheric cooling patterns observed during summer resulted in a reinforcement of the Southern Annular Mode (SAM), which caused intensification of the surface temperature inversion. This disturbance led to the Antarctic Polar Vortex shifting towards the Equator. The transition from the distinct triple La Niña event to the onset of a warm phase in 2023 resulted in the Amundsen Sea Low (ASL) deepening, which advected warm air into the region and push sea ice back towards the coast, reducing its extent particularly in the west of the Antarctic Peninsula region. Additionally, anomalies in the upper ocean (0–300 m) indicate subsurface ocean warming in most sectors.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"252 ","pages":"Article 104858"},"PeriodicalIF":4.0,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143901855","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":"Climate changes at the Jurassic/Cretaceous transition vs. supra-regional oceanographic processes: Insights from the Vocontian Basin (Clue de Taulanne section, SE France)","authors":"Damian Gerard Lodowski ,&nbsp;Johann Schnyder ,&nbsp;Justyna Kowal-Kasprzyk ,&nbsp;Jean-François Deconinck ,&nbsp;Mathieu Martinez ,&nbsp;Andrzej Chmielewski ,&nbsp;Izabela Ploch ,&nbsp;Jacek Grabowski","doi":"10.1016/j.gloplacha.2025.104836","DOIUrl":"10.1016/j.gloplacha.2025.104836","url":null,"abstract":"<div><div>Herein are presented the results of a detailed stratigraphic calibration and palaeoenvironmental studies performed in the upper Tithonian–lowermost Valanginian deposits of the Vocontian Basin (SE France), with special attention being paid to the Clue de Taulanne section. Integration of calpionellid biostratigraphy, magnetostratigraphy and δ¹³C stratigraphy, supplemented with regional correlations, enables precise dating of the latest Jurassic–earliest Cretaceous climate and oceanographic perturbations. These are recognized based on sedimentologic (microfacies analyses, clay mineralogy) and geochemical (elemental geochemistry, TOC) investigations. This research confirms that the latest Tithonian–early Berriasian (Tintinnopsella remanei–mid Calpionella elliptica subzones) was marked by a phase of dry climate and elevated burial of micronutrients. Furthermore, the uppermost Tithonian (Remanei/Massutiniana subzonal transition) documents an important palaeoecologic turnover, that is the disappearance of <em>Saccocoma</em> and a switch from radiolarian- to calpionellid-dominated microfacies. The subsequent shift towards humid palaeoclimate conditions at the early/late Berriasian transition was relatively rapid (∼ 0.5 Ma), as evidenced by a significant increase in kaolinite proportion within the mid-Elliptica Subzone (mid M17r magnetozone; latest early Berriasian). Importantly, this major climate change was associated with lowered burial of nutrient-type elements, relative to lithogenic fraction. Collected data not only evidence the relation between the latest Jurassic–earliest Cretaceous climate and oceanographic processes, but also document biotic response to these perturbations. The regional significance of the above findings is evidenced by correlations between different sedimentary zones of the Vocontian Basin (Clue de Taulanne, Berrias, Montclus and Tré Maroua sections), while supra-regional context is provided by comparison with other Alpine Atlantic successions: Transdanubian Range and the Slovenian Basin.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"252 ","pages":"Article 104836"},"PeriodicalIF":4.0,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144069987","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":"First paleoenvironmental calibrations for modern pollen rain of Tajikistan and Uzbekistan: A case study of pollen - vegetation functional biogeography of Arid Central Asia","authors":"Lucas Dugerdil ,&nbsp;Odile Peyron ,&nbsp;Guillemette Ménot ,&nbsp;Dilfuza Egamberdieva ,&nbsp;Jakhongir Alimov ,&nbsp;Suzanne A.G. Leroy ,&nbsp;Eric Garnier ,&nbsp;Arkadiusz Nowak ,&nbsp;Sébastien Joannin","doi":"10.1016/j.gloplacha.2025.104857","DOIUrl":"10.1016/j.gloplacha.2025.104857","url":null,"abstract":"<div><div>Studying modern pollen rain in Middle Asia is crucial for understanding past climate and vegetation changes. This study presents the first dataset of pollen surface samples and vegetation plots from Tajikistan and Uzbekistan, known as the Tajikistan and Uzbekistan Surface Data Base (TUSDB), to enhance our understanding of past climate and vegetation changes in Arid Central Asia (ACA). Multivariate analysis methods, including TWINSPAN and CONISS, are used to review the primary vegetation types in Central Asia and assess pollen distribution across these types. Linear relationships, Davis indices, and R-values are applied to evaluate vegetation representativeness based on pollen abundances. Redundancy Analysis is used to compare pollen and climate parameters, and the reliability of TUSDB for local climate reconstructions is tested using transfer functions and machine learning approaches.</div><div>The TWINSPAN analysis identifies vegetation types consistent with the Uzbek classification, such as desert, steppe, and cryophilous open woodlands. Nine vegetation subtypes are revealed by the pollen samples, with key contributions from trees like <em>Juniperus</em> spp. and <em>Juglans regia</em>, and non-arboreal plants like Cyperaceae and Poaceae. The study also highlights biases in pollen representation, with some tree taxa overrepresented and certain vegetation-important taxa underrepresented, which can be corrected using pollen R-values.</div><div>Finally, functional trait aggregation for past pollen sequences shows similarities between modern pollen and vegetation plots. Climate reconstructions validated through transfer functions highlight the complementary role of local and global calibration datasets. These findings confirm the reliability of pollen signals for inferring Holocene climate and vegetation trends, enabling future Uzbek pollen-based reconstructions.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"252 ","pages":"Article 104857"},"PeriodicalIF":4.0,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143900359","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":"Early interglacial carbonate-dilution events increased terrigenous organic matter deposition in seamount sediments of the northern South China Sea since the last deglaciation","authors":"Fuqiang Wang ,&nbsp;Xu Tian ,&nbsp;Xilin Zhang ,&nbsp;Weikun Xu ,&nbsp;Shuwen Sun ,&nbsp;Honghua Shi ,&nbsp;Meixun Zhao","doi":"10.1016/j.gloplacha.2025.104845","DOIUrl":"10.1016/j.gloplacha.2025.104845","url":null,"abstract":"<div><div>A thermal maximum in the West Pacific Warm Pool, with La Ni<span><math><mrow><mover><mi>n</mi><mo>∼</mo></mover></mrow></math></span>a-like conditions prevailing during the early Holocene, triggered frequent and intensive typhoons affecting Taiwan Island. However, no studies have conclusively demonstrated whether fluvial inputs affected the deposition of terrigenous organic matter (OM) in deep-sea sediments during early interglacial carbonate-dilution events. This study measured dual carbon isotopes (δ¹³C and Δ¹⁴C) of total organic carbon (TOC) and organic compound classes in the seamount Core SCS18–1 to evaluate the influences of the carbonate-dilution events on OM deposition in the northern South China Sea (NSCS). The radiocarbon mass balance revealed greater percentages of terrigenous OM during the early interglacial carbonate-dilution events (30 ± 1 %), suggesting rapid transport of substantial amounts of terrigenous OM from Taiwan Island, driven by intensified typhoon activities. Among organic compound classes, total hydrolysable amino acids have gradually decreased in terrigenous contributions since the last deglaciation, due to the prolonged lateral transport time influenced by rising sea-level. Humic acids had the greatest terrigenous contribution during the carbonate-dilution events (27 %), indicating that they were sensitive to the carbonate-dilution events. Additionally, acid-base insoluble OM and lipids increased in terrigenous sources during the transgression phase, indicating the influences of sea-level rise and the carbonate-dilution events. These carbon isotopic results suggest that OM in seamounts provides reliable paleoclimatic information for deep-sea sediments, underscoring that the large number of seamounts may shed new light on the transport of terrigenous OM from land to ocean on a global scale.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"252 ","pages":"Article 104845"},"PeriodicalIF":4.0,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874434","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}