Global and Planetary Change最新文献

{"title":"Tropical cyclothems suggest obliquity control on early glaciation of the Late Paleozoic Ice Age (late Mississippian, Upper Silesia)","authors":"Jiří Laurin ,&nbsp;Stanislav Opluštil ,&nbsp;Jiří Horák ,&nbsp;Mark Schmitz ,&nbsp;Lada Hýlová ,&nbsp;Martin Sivek ,&nbsp;Weronika Nadłonek ,&nbsp;Beata Naglik","doi":"10.1016/j.gloplacha.2025.105201","DOIUrl":"10.1016/j.gloplacha.2025.105201","url":null,"abstract":"<div><div>The Late Paleozoic Ice Age (LPIA; ∼355–255 Ma) represents an internally complex interval of icehouse conditions, comprising a series of discrete, Myr-scale episodes of cryosphere expansion and contraction. A short-term variability on astronomical time scales has been identified in many studies, but the detailed structure of these changes and their interaction with Myr-scale cryosphere fluctuations is not fully understood. Here, we examine tropical cyclothems, which formed in the eastern part of the Variscan foreland (Poruba Member of the Upper Silesian Basin) and may represent a far-field record of glacioeustasy during an early phase of Gondwanan glaciation. A combination of new and published radioisotopic U-Pb zircon ages constrains the timing of Poruba cyclothems to 325.2–323.4 Ma, between Myr-scale phases of glacial expansion identified as C1 and C2 in eastern Australia. Spectral estimates of lithofacies profiles suggest that sea-level variations were paced predominantly by the 173-kyr cycle of obliquity modulation, with smaller scale changes in the ∼35-kyr obliquity band. Short-eccentricity signature is localized to the vicinity of source area, possibly reflecting upstream changes in sediment input. In spite of nonglacial conditions in eastern Australia, the results suggest that dynamic ice sheets reacting to integrated summer insolation likely formed in the polar region. The Upper Silesian cyclothems further suggest that a Myr-scale deglaciation in peripheral glacial centers (termination of C1 in eastern Australia) was associated with an increase in the frequency of ice-sheet variability. This change can be considered inversely analogous to the mid-Pleistocene transition, but its frequency structure differs, pointing to distinct insolation control and feedback mechanisms during LPIA.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"257 ","pages":"Article 105201"},"PeriodicalIF":4.0,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145657556","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":"Simulation of the climatic conditions required for the existence of ice sheet on the Tibetan Plateau","authors":"Baohuang Su ,&nbsp;Yong Sun","doi":"10.1016/j.gloplacha.2025.105202","DOIUrl":"10.1016/j.gloplacha.2025.105202","url":null,"abstract":"<div><div>The Tibetan Plateau (TP) has been a focal point in research on whether it experienced large-scale glaciation during glacial periods. Given the significant regional differences in glacier development and distribution on the TP, accurately determining the climatic conditions necessary for maintaining glaciers is challenging. This study combines numerical experiments using the Community Atmosphere Model version 5 (CAM5) and the Parallel Ice Sheet Model (PISM) to establish the temperature-precipitation constraints for widespread glaciation across the TP. Simulation results show substantial regional differences in temperature and precipitation thresholds needed for full-scale TP glaciation, with the western and northern regions requiring the least temperature reduction. A comparison with geological reconstructions indicates that the development of a widespread ice sheet would have demanded an average regional cooling of at least 10 °C—a magnitude which far exceeds the cooling reconstructed from proxy data. This implies that a contiguous ice sheet was unlikely during the Last Glacial Maximum. Further CAM5 sensitivity experiments reveal that the climate feedback from full-scale TP glaciation was dominated by the albedo effect, with ice thickness playing a secondary role. The present study establishes a temperature and precipitation framework that defines the conditions required for extensive glaciation on the TP, thereby providing scientific insights into its paleoglaciation history.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"257 ","pages":"Article 105202"},"PeriodicalIF":4.0,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145609524","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":"Geochemical evidence for the potential extinction mechanisms of the floating fern Azolla in the early Eocene Arctic","authors":"Xiaojie Fan ,&nbsp;Jingyu Zhang ,&nbsp;Jingbo Nan ,&nbsp;Zhanjie Qin ,&nbsp;Xiaohua Teng ,&nbsp;Wei Wei","doi":"10.1016/j.gloplacha.2025.105198","DOIUrl":"10.1016/j.gloplacha.2025.105198","url":null,"abstract":"<div><div>The freshwater fern <em>Azolla</em> blooms in the late early Eocene Arctic Ocean, under high <em>p</em>CO₂, low salinity, and nutrient-rich conditions, played a critical role in global carbon sequestration and climate cooling. Despite some studies on its proliferation, the mechanisms behind its abrupt extinction remain unresolved. This study reconstructs paleoenvironmental conditions during and after the <em>Azolla</em> phase using sediment cores from Integrated Ocean Drilling Program (IODP) Expedition 302, on the basis of multiple geochemical proxies. Both boron/gallium (B/Ga) and strontium/barium (Sr/Ba) ratios indicate no significant changes in salinity during both the <em>Azolla</em> bloom and collapse phase, suggesting that salinity may not have been the primary driver. Elevated aluminum content and chemical index of alteration (CIA) values during the <em>Azolla</em> phase reflect intensified chemical weathering and terrestrial nutrient influx, sustaining high primary productivity. High molybdenum enrichment (Mo_EF) supports euxinic bottom-water conditions that enhanced phosphorus (P) release, establishing a positive productivity feedback, as shown by inverse P/Al ratios and TOC content. Previous studies have linked the termination of <em>Azolla</em> to obliquity-modulated aridification, which reduced precipitation and weathering, curtailing the riverine nutrient supply. A shift from euxinic to ferruginous bottom water conditions promoted sedimentary phosphorus burial, as shown by rising P/Al ratios, and suppressed nutrient recycling. These processes may have led to phosphorus limitation, triggering <em>Azolla</em> collapse. Given its significant contribution to organic carbon burial, the demise of <em>Azolla</em> likely perturbed the Arctic carbon sink and atmospheric CO₂, underscoring the sensitivity of high-latitude ecosystems to climate-driven nutrient availability. This study provides new insights into the sensitivity of high-latitude ecosystems under warming climates.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"257 ","pages":"Article 105198"},"PeriodicalIF":4.0,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145609527","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":"Tree-ring δ18O reveals a consistent decrease in April precipitation in southeastern China since the 1950s and its linkage to global climate phenomena","authors":"Fang Wang ,&nbsp;Guoliang Lei ,&nbsp;Chotika Muangsong ,&nbsp;Binggui Cai ,&nbsp;Miaofa Li ,&nbsp;Keyan Fang ,&nbsp;Nathsuda Pumijumnong ,&nbsp;Rattanakorn Chatwatthana ,&nbsp;Shankar Panthi","doi":"10.1016/j.gloplacha.2025.105249","DOIUrl":"10.1016/j.gloplacha.2025.105249","url":null,"abstract":"<div><div>The East Asian Summer Monsoon (EASM) precipitation in southeastern (SE) China has intraseasonal evolution, unique characteristics, and complex drivers. Within the EASM, April precipitation plays a crucial role in the first rainy season (FRS) precipitation. Accurately quantifying the long-term temporal variability of FRS precipitation is essential for enhancing monthly and seasonal precipitation forecasts. This study presented the hitherto longest tree-ring δ¹⁸O chronologies (LSMδ¹⁸O) of <em>Cryptomeria fortune</em> trees spanning 201 years (1816–2016 CE) from Fujian province in SE China. The LSMδ¹⁸O chronology showed the strongest negative correlation with monthly precipitation in April (<em>r</em> = −0.59, <em>p</em> &lt; 0.001) for the calibration period 1951–2016 CE, indicating a strong association between the tree-ring δ¹⁸O signature and FRS precipitation variability. This relationship enabled the first reconstruction of April precipitation (reconstructed PRE_Apr) in SE China for the period 1856–2016 CE. A total of 30 % (48 events) of precipitation anomalies were observed in the reconstruction. The low-PRE_Apr anomalies were identified, for example, in 1875, 1895, 1902, 1987, 1998, and 2004 CE. Reconstrued PRE_Apr revealed spectral peaks of 2–7 years high-frequency periodicities associated with El Niño–Southern Oscillation activities due to higher sea surface temperature variation at the tropical Pacific Ocean. The reconstructed PRE_Apr effectively captured the synchronous precipitation shifts across SE China and the western Pacific domain, indicating an anomalous declining trend in the large-scale precipitation changes since the 1950s CE. The seasonal extreme precipitation events associated with rising Northern Hemisphere temperatures have become more frequent and severe in SE China under a warming climate.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"257 ","pages":"Article 105249"},"PeriodicalIF":4.0,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145785316","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":"Assessment of CO2 storage potential in global marine sediments based on machine learning methods","authors":"Yang Zhang ,&nbsp;Junjie Ji ,&nbsp;Qiuming Cheng ,&nbsp;Long Teng ,&nbsp;Bingye Di","doi":"10.1016/j.gloplacha.2025.105210","DOIUrl":"10.1016/j.gloplacha.2025.105210","url":null,"abstract":"<div><div>The ocean, as a vast potential carbon sink, provides a promising avenue for long-term CO₂ storage through the formation of stable hydrate formation zones (HFZ) or negative buoyancy zones (NBZ) in subseabed sediments under high-pressure and low-temperature conditions. Despite its potential, CO₂ sequestration in marine sediments remains at an early stage due to technical challenges, insufficient understanding of subseabed conditions, and the absence of a comprehensive global storage potential assessment. A key factor in evaluating regional HFZ and NBZ thicknesses is the distribution of marine geothermal gradients. Unlike conventional methods that assume constant geothermal gradients or use simplistic interpolations, this study integrates diverse global geological and geophysical datasets with advanced machine learning regression techniques, including Random Forest Regression, Support Vector Regression, and Extreme Gradient Boosting Regression, to predict the high-resolution (0.1° × 0.1°) global distribution of marine geothermal gradients. Utilizing these predicted gradients, along with CO₂ hydrate phase equilibrium and CO₂ density curves, we present the first global maps of HFZ and NBZ thicknesses in marine sediments. The results highlight significant spatial variability in HFZ and NBZ thicknesses, offering valuable insights into ocean thermal structures and establishing a robust scientific basis for advancing large-scale CO₂ sequestration in marine sediments.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"257 ","pages":"Article 105210"},"PeriodicalIF":4.0,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145658148","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":"Surface-to-deep-ocean ecosystem responses to orbital-to-millennial-scale paleoceanographic variability across the mid-Brunhes at the Iberian margin","authors":"A. González-Lanchas ,&nbsp;J. Dorador ,&nbsp;J.-A. Flores ,&nbsp;F.J. Rodríguez-Tovar","doi":"10.1016/j.gloplacha.2025.105205","DOIUrl":"10.1016/j.gloplacha.2025.105205","url":null,"abstract":"<div><div>This study provides new insights into how oceanographic changes along the mid-Brunhes interval (MBI) influenced interactions between surface productivity and deep-sea environment in the North Atlantic, southwestern Iberian Margin (SW IbM) region. High-resolution ichnological and sediment colour analyses from International Ocean Discovery Program (IODP) Site U1385 reveal that the transfer of organic matter from the surface ocean to the seafloor was strongly modulated by both orbital- and suborbital-scale climate variability. Variations in the composition of the ichnological assemblages (including ichnotaxa <em>Chondrites</em>, <em>Ophiomorpha</em>, <em>Planolites</em>, <em>Scolicia</em>, <em>Taenidium</em>, <em>Teichichnus</em>, <em>Thalassinoides</em>, and <em>Zoophycos</em>), bioturbation, and sediment colour patters, assessed between Marine Isotope Stages (MIS) 12 to 9 (∼450 to 339 ka), indicate a sensitive response of deep-sea macrobenthic tracemaker communities. The integration of this data with high-resolution reconstructions of surface productivity and surface-to-deep hydrology at the studied site indicates that surface ocean conditions and production patterns were not always recorded in the sediments and benthic communities. This highlights the key role of bottom-water conditions and deep-water ventilation on the preservation of organic matter and the benthic ecosystem dynamics. Reduced oxygenation during Heinrich-<em>type</em> events likely limited tracemaker activity, as reflected in decreasing both ichnodiversity and bioturbation abundance, whereas interglacial periods supported more diverse and active communities. These findings underscore the value of integrating ichnological data with micropaleontological and geochemical proxies as a key route to reconstruct surface-to-deep ocean ecosystem and hydrodynamic linkages. Together with this, findings in this research provide new insights into how the mid-latitude North Atlantic deep-sea ecosystems responded to past climate variability across the key mid-Brunhes transition of the Pleistocene.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"257 ","pages":"Article 105205"},"PeriodicalIF":4.0,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145613698","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":"40Ar/39Ar chronology of sea-level change before and during the interglacial maxima of Marine Isotope Stage 13","authors":"Eduardo Di Marcantonio ,&nbsp;Luca Aldega ,&nbsp;Francesca Bulian ,&nbsp;Luigi Dallai ,&nbsp;Fabio Florindo ,&nbsp;Mario Gaeta ,&nbsp;Brian Jicha ,&nbsp;Gianluca Marino ,&nbsp;Fabrizio Marra","doi":"10.1016/j.gloplacha.2025.105206","DOIUrl":"10.1016/j.gloplacha.2025.105206","url":null,"abstract":"<div><div>Marine Isotope Stage (MIS) 13 represents the most recent “lukewarm” interglacial within the sequence of glacial and interglacial periods that has characterized global climate over the past million years. It comprises two interglacial maxima (MIS 13.3 and MIS 13.1) and follows MIS 14.2, which is generally regarded as a weakly developed glacial period. New and existing data from the ⁴⁰Ar/³⁹Ar-dated aggradational successions of the Paleotiber drainage system provide precise constraints on the timing and nature of sea-level change before and during MIS 13. Gravel deposition and/or river incision allow identifying two sea-level lowstands, followed by glacial terminations VIb and VIa, which culminated at 533.7 ± 1.6 ka and 515.7 ± 1.3 ka and led to sea-level highstands of different magnitude and duration during interglacial maxima MIS 13.3 and MIS 13.1, respectively. MIS 13.1 featured higher sea level and lasted almost twice as long as MIS 13.3, reflecting an antiphase relationship between obliquity and precession that likely maintained warm northern high latitudes and sustained ice-sheet melting. A warmer and less glaciated Northern Hemisphere at the end of the MIS 13 interglacial supports the view that the transition from “lukewarm” to “super-interglacials” at the Mid-Brunhes Transition was preceded by a long-term shift toward warmer conditions and reduced residual continental ice in the Northern Hemisphere, reaching a maximum during MIS 13.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"257 ","pages":"Article 105206"},"PeriodicalIF":4.0,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145613694","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":"Deformation dynamics of the retro-wedge foreland: Seismic interpretation and numerical modeling study of the Llanos Basin, Colombia","authors":"Michal Nemčok ,&nbsp;Steve A. Hermeston ,&nbsp;Andreas Henk ,&nbsp;Andres Mora ,&nbsp;Camilo Higuera ,&nbsp;Mauricio Parra ,&nbsp;Samuel Rybár ,&nbsp;Lucia Ledvényiová","doi":"10.1016/j.gloplacha.2025.105274","DOIUrl":"10.1016/j.gloplacha.2025.105274","url":null,"abstract":"<div><div>Combining reflection seismic interpretation with numerical modeling, this paper studies the deformation dynamics of the foreland plate overridden by the retro-wedge of an advancing subduction zone. The post-middle Eocene Llanos foreland basin serves as the natural laboratory. The reflection seismic interpretation identifies five elongated clusters of flexure-driven normal-faults, centered on the forebulge axis. Clusters have different stratigraphies of their syn-tectonic strata. They are located foreland-ward of thickness maxima of the coeval foreland basin fill. Normal faults are mostly planar, steep and die out with depth without being detached. Both fault clusters and infill thickness maxima are characterized by the SW-to-NE migration in time. Those sub-sets of normal faults, which are adjacent to retro-wedge, underwent tectonic inversion. They became reverse faults in a short time interval, likely less than 1-2 million years. The modeling demonstrates that the inversion requires a stress regime with sub-horizontal σ₁ stress affecting the foreland crust located between the forebulge and retro-wedge. This regime does not occur when the foreland plate is only loaded by the retro-wedge and foreland basin fill. It requires both vertical loads plus horizontal compression affecting the foreland plate. The modeling also indicates that both aforementioned loading scenarios result in the development of forebulge axis-centered clusters of flexure-driven normal faults. The modeling also indicates that the orogen-parallel Jurassic – Early Cretaceous rift-related crustal thinning zone located in the foreland plate results in its narrow flexure mode. Instead, the lack of crustal thinning results in a broad flexure mode of the foreland plate.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"257 ","pages":"Article 105274"},"PeriodicalIF":4.0,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145845313","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":"Human settlement doubled global oceanic island erosion and fire regimes during the early colonization stage","authors":"Fan Zhang ,&nbsp;Huawei Wang ,&nbsp;Chuan-Chou Shen ,&nbsp;Jian Lin ,&nbsp;Kai Zhou ,&nbsp;Yongshun Chen ,&nbsp;Kunshan Bao ,&nbsp;Xinxin Li","doi":"10.1016/j.gloplacha.2025.105234","DOIUrl":"10.1016/j.gloplacha.2025.105234","url":null,"abstract":"<div><div>Although anthropogenic disturbances on the landscape and ecology of individual oceanic islands over the past millennia have been documented from archaeological and paleo-ecological archives, the quantitative evaluation on a global scale allows for the exploration of more dimensions of anthropogenic impacts on islands. Here, we analyze sedimentation rates and charcoal concentrations integrated from 45 islands worldwide to evaluate soil erosion and fire regimes associated with human pre-contact, initial-colonization, and post-settlement stages. Compared to the relatively low and constant pre-contact background values, both parameters experienced unprecedented changes during the initial-colonization stage. The increasing rates are primarily driven by human activities, including large-scale fire-induced deforestation and intensive agricultural practices. In the post-settlement stage, sedimentation rates and fire occurrences either decreased or increased, but were still higher than their background levels. A comparable level and pattern of human disturbance during the initial-colonization stage is evident across the Atlantic, Indian, and Pacific Oceans. The Polynesian Triangle, the last main migration frontier in the Pacific Ocean after 1000 CE, however, experienced the most intensive anthropogenic influence. The study underscores that, apart from the Industrial Revolution, the initial-colonization stage of ∼300 years had the most profound impact. Following the post-colonization stage, these ecosystems transitioned to a new, more dynamic state, rather than reverting to pre-human conditions.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"257 ","pages":"Article 105234"},"PeriodicalIF":4.0,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145690070","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":"Upwelling enhances cycling and emissions of very short-lived halocarbons: Biogeochemical mechanisms and climate feedbacks","authors":"Ya-Wen Zou ,&nbsp;Qin-Sheng Wei ,&nbsp;Cheng-Xuan Li ,&nbsp;Xing Zhai ,&nbsp;Ming Xin ,&nbsp;Xiao-Meng Duan ,&nbsp;Hui Ding ,&nbsp;Baodong Wang","doi":"10.1016/j.gloplacha.2025.105204","DOIUrl":"10.1016/j.gloplacha.2025.105204","url":null,"abstract":"<div><div>Very short-lived (VSL) halocarbons have significant impacts on global atmospheric chemistry and climate change. However, the complex effects of different marine environments on the budgets of VSL halocarbons with primarily marine origin such as dibromomethane (CH₂Br₂), tribromomethane (CHBr₃), and methyl iodide (CH₃I) have led to significant uncertainty in estimating their oceanic emissions. To elucidate the key processes and mechanisms controlling VSL halocarbons in seawater and atmosphere in upwelling regions where are typically hot spots for VSL halocarbons emissions, field investigation and ship-based incubation experiments were conducted in the Southeastern Atlantic Ocean (SAO), including the Benguela Upwelling System, from February to March 2023. Higher VSL halocarbons concentrations in seawater and atmosphere were observed in the upwelling region compared to the non-upwelling region. Upwelling transported abundant nutrients into the euphotic layer, promoting primary production and stimulating rapid VSL halocarbons biological production. Furthermore, by evaluating the source-sink rates of VSL halocarbons within the mixed layer, we identified the vertical exchange is a potential source in most cases which transporting substantial amounts of these gases from thermocline to the mixed layer—a process enhanced by upwelling. These combined effects led to rapid accumulation of VSL halocarbons in surface waters, ultimately driving 38.8–215.7 % greater sea-air fluxes of CH₂Br₂, CHBr₃ and CH₃I relative to non-upwelling regions, indicating that upwelling drives greater emissions of marine VSL halocarbons to the atmosphere. Our research advances the understanding of the VSL halocarbons source-sink processes and emission in upwelling systems.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"257 ","pages":"Article 105204"},"PeriodicalIF":4.0,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145690071","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}