Palaeogeography, Palaeoclimatology, Palaeoecology最新文献

{"title":"Paleoenvironment fluctuations and conodont size variations in the Baoshan block of eastern Tethys: implications for the late Norian warming event (Late Triassic)","authors":"Bao Guo ,&nbsp;Yixing Du ,&nbsp;Xin Jin ,&nbsp;Tetsuji Onoue ,&nbsp;Honami Sato ,&nbsp;Yuki Tomimatsu ,&nbsp;Lu Han ,&nbsp;Zhiqiang Shi ,&nbsp;Yuehan Sun ,&nbsp;Qiangwang Wu ,&nbsp;Manuel Rigo","doi":"10.1016/j.palaeo.2025.112983","DOIUrl":"10.1016/j.palaeo.2025.112983","url":null,"abstract":"<div><div>The Norian Stage of the Late Triassic represents a significant interval in geological history marked by environmental and biological evolutions. One notable event during this time is the late Norian warming event (W3), occurring in the late Norian. Globally recorded, the warming event is associated with carbon cycle perturbations, temperature increases, changes in biodiversity, and enhanced weathering intensity. Previous studies have focused on carbon isotopes, sedimentology, and biostratigraphy in the Baoshan block. However, information on environmental changes in this area during the Norian Stage remains limited. In this study, we utilized redox conditions indexes (V/Cr, U/Th, Mo_EF/U_EF, and Ce/Ce^⁎) and paleo-productivity proxies (P_org, Ba_xs) to reconstruct the ocean paleoenvironment in the HYB section of the Baoshan block. Two stages of reducing conditions and paleo-productivity fluctuations were identified during the late Norian warming event interval. In addition, the size of 1606 well-preserved adult conodont pectiniform elements from the HYB section was measured. The mean length of conodonts increased before the Alaunian-Sevatian boundary and then decreased significantly after the boundary in the Sevatian. Conodont size variations are typically related to changes in living environments, but our study found no direct relation between changes in redox conditions, paleo-productivity, and variations in conodont size in the Baoshan block. It may be due to the predominant conodont fauna, <em>Mockina</em>, being surface water dwellers. These surface-dwelling conodonts were not influenced by changes in seafloor redox conditions in relatively deep water. The direct evidence is instead that the size variation of conodonts is more likely affected by temperature changes in Tethyan surface seawater during the late Norian warming event.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"671 ","pages":"Article 112983"},"PeriodicalIF":2.6,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143895699","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}

{"title":"HORSE: Harmonize regional and global stratigraphic records through horizon sequencing","authors":"Tianyi Chu ,&nbsp;Hanhui Huang ,&nbsp;Junxuan Fan ,&nbsp;Yiying Deng ,&nbsp;Tao Xu ,&nbsp;Chao Qian ,&nbsp;Ke Xue ,&nbsp;H. David Sheets ,&nbsp;Michael H. Stephenson ,&nbsp;Yukun Shi ,&nbsp;Xudong Hou","doi":"10.1016/j.palaeo.2025.112976","DOIUrl":"10.1016/j.palaeo.2025.112976","url":null,"abstract":"<div><div>A uniform, high-resolution geological timescale is essential for studying Earth's history, including the dynamics of biodiversity and environmental change. Quantitative stratigraphy combines stratigraphic data with statistical and computational approaches into a global timescale that allows them to be correlated simultaneously. For example, Constrained Optimization (CONOP), built upon Graphic Correlation, sequences geological events to generate a composite sequence by resolving inconsistencies among stratigraphic records. However, CONOP determines only the global order of events (e.g., first or last appearances of species) and cannot assign ages to local records, e.g., a locally observed fossil occurrence. Horizon Annealing (HA) addresses this by using a simulated annealing algorithm to sequence sampling “horizons” while preserving local stratigraphic details. Here, we report HORizon SEquencing (HORSE), a generalized and optimized method for HA, with an implementation including parallel computing and genetic algorithms to enable fast, automatic stratigraphic correlation on large datasets. We evaluate HORSE, HA, and CONOP on three datasets—two empirical and one simulated—and assess their performance in terms of accuracy, efficiency, and robustness. HORSE greatly outperforms HA in computational efficiency and performs comparably to CONOP in event sequencing with greater robustness. Beyond constructing high-resolution geological timescales or life histories in deep time, HORSE uniquely preserves local stratigraphic information, enabling applications in palaeogeographical or palaeoecological studies, as well as evaluations of preservation and sampling biases—capabilities not possible with CONOP.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"670 ","pages":"Article 112976"},"PeriodicalIF":2.6,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143875039","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}

{"title":"A simple climate-driven semi-mechanistic vegetation model can explain the pan-Asian extent of the glacial mammoth steppe","authors":"Lisa Merkens ,&nbsp;Tim Anders ,&nbsp;Wolfgang Traylor ,&nbsp;Hervé Bocherens ,&nbsp;Thomas Hickler","doi":"10.1016/j.palaeo.2025.112962","DOIUrl":"10.1016/j.palaeo.2025.112962","url":null,"abstract":"<div><div>Graminoid and forb tundra vegetation has been hypothesized to have covered a vast area in northern Eurasia during the Late Pleistocene cold phases, providing habitat for many now-extinct megaherbivores. The formation and persistence of this now nearly-lost vegetation have been either attributed to the cold and arid climate of the glacials (climate hypothesis) or the action of its large herbivores (keystone herbivore hypothesis). Here, we test whether the extent of this plant community can be modelled mechanistically using a few bioclimatic variables with clear physiological effects on plants. We fitted the bioclimatic limits based on the distribution of the closest modern analogues of the graminoid-forb-tundra. Next, we applied this parameterization to conditions of the Last Glacial Maximum, given by the gridded climate-model-based CHELSA-TraCE21k paleoclimate dataset. The projected glacial distribution of the graminoid and forb tundra mainly expands in central Siberia. The model failed to reproduce fossil-inferred occurrences of graminoid and forb tundra in glacial Europe and northern Eurasia, however, possibly because of inaccuracies in CHELSA-TraCE21k, with temperatures being too high in Europe and too low in northern Siberia. This initial study suggests that climate might have played a substantial role in forming the glacial graminoid and forb tundra, but analyses with more climate models will be necessary to corroborate this finding. Our parsimonious, transparent, and process-based model holds the potential for testing the climate hypothesis more rigorously with additional and improved palaeoclimate data.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"670 ","pages":"Article 112962"},"PeriodicalIF":2.6,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876876","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}

{"title":"Palaeoglacial and palaeoclimate inferences from cirque morphometry and spatial distribution across northern Patagonia (40o – 45o S)","authors":"R.L. Soteres ,&nbsp;D.A. Cabrera ,&nbsp;M.A. Martini ,&nbsp;E.A. Sagredo ,&nbsp;J. Pedraza ,&nbsp;R.M. Carrasco ,&nbsp;M.R. Kaplan ,&nbsp;J.M. Araos","doi":"10.1016/j.palaeo.2025.112939","DOIUrl":"10.1016/j.palaeo.2025.112939","url":null,"abstract":"<div><div>The evolution of the cryosphere and climate in northern Patagonia during the late Pleistocene are relatively well-known thanks to chronologies on ice-marginal features. However, this knowledge mainly represents the magnitude and duration of extreme cold intervals occurring during glacial maxima. Consequently, less is known about the state of the glaciers and climate during transitions between full glacial and interglacial stages. Given that morphometric attributes of glacial cirques are considered as robust indicators of palaeoglacial and palaeoclimate conditions during phases of minor glaciation, examining cirques will yield key insights to assess the typology of glaciers and associated climate conditions during those pivotal periods. In this study, we systematically analyzed the morphology and spatial distribution of 3081 cirques in northern Patagonia between ∼40^o and ∼ 45^o S. Our findings revealed that circular cirques, reflecting widespread long-lived small glaciers, dominate northern Patagonia. Eastward increase of cirque floor altitude from the coast to the continent along with prevailing east-to-south aspects indicate a key role of westerly-controlled climate and radiative balance in cirque development. Morphometry and spatial distribution of cirques along with statistical analyses indicate that annual total precipitation, minimum temperature, and incoming solar radiation altogether play a major role in cirque development in northern Patagonia, although the relative importance of these factors might vary spatially. Regional lithology exerts a secondary influence mostly in cirque geometry. We conclude that the most frequent state of the cryosphere within the Pleistocene glacial cycles in northern Patagonia is characterized by moderate glaciations similar to that existing during glacial terminations.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"670 ","pages":"Article 112939"},"PeriodicalIF":2.6,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869887","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}

{"title":"Mechanism for the synchronous changes between lake level and global sea level during the Eocene warmhouse climate: Evidence from lacustrine carbonates","authors":"Jinghong Xu ,&nbsp;Pei Guo ,&nbsp;Yiquan Ma ,&nbsp;Chao Jiang ,&nbsp;Peng Liu ,&nbsp;Wenli Xu ,&nbsp;Changzhi Li","doi":"10.1016/j.palaeo.2025.112972","DOIUrl":"10.1016/j.palaeo.2025.112972","url":null,"abstract":"<div><div>Under the Eocene warmhouse climate, the lake level changes in lacustrine basins in East China have been found to synchronize with global sea level changes, although the mechanism driving these synchronized changes remains unclear. Here, we focus on the lacustrine carbonates of the upper fourth member of the Shahejie Formation (Es4s) in the Zhanhua Sag of the Bohai Bay Basin to study the controlling factors of the lake level changes in East China and to analyze the major cause of their linkage to global sea level changes. Based on observations of thin sections, cathodoluminescence, scanning electron microscopy and analyses of carbon and oxygen isotopes, the vertical changes of carbonate lithofacies and geochemistry over the Es4s have been reconstructed. The Es4s of the Bohai Bay Basin consists of a complete third-order sequence, with carbonate deposition changing from gypseous micritic carbonates during the lowstand stage, to dolomicrobialites and dolograinstones during the transgressive stage, to marlstone at the maximum lake flooding surface, and to micritic limestone during the highstand stage. Upward, oxygen isotopic compositions of carbonates show a negative excursion (from −7 ‰ to −11 ‰) in the transgression system tract, while carbon isotopic compositions instead show a positive excursion (from −1 ‰ to +4 ‰). The deposition of dolostone with lowest oxygen isotopes and highest carbon isotopes during the transgressive stage is interpreted to be related to the mixing of meteoric water with saline lake water. This study suggests that astronomically driving monsoon climate change is likely to be one of the reasons for the synchronized changes in lake level and global sea-level, and that other potential factors need to be further investigated.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"670 ","pages":"Article 112972"},"PeriodicalIF":2.6,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855449","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}

{"title":"Influence of monsoon variability on hydrographic and productivity dynamics in the western Bay of Bengal during the late Holocene: A planktic foraminiferal perspective","authors":"Satabdi Mohanty ,&nbsp;Swagata Chaudhuri ,&nbsp;Koustav Chattopadhyay ,&nbsp;Nitika Millicent Patrick ,&nbsp;Nishant Vats ,&nbsp;Ajoy K. Bhaumik","doi":"10.1016/j.palaeo.2025.112971","DOIUrl":"10.1016/j.palaeo.2025.112971","url":null,"abstract":"<div><div>Late Holocene paleoceanographic changes and the paleoenvironmental evolution of the Western Bay of Bengal (WBoB) were reconstructed using planktic foraminifera obtained from the NGHP-15A core sediments. The planktic foraminiferal record shows significant variations in surface hydrography and productivity due to seasonal monsoon rainfall and wind strength during the late Holocene. The foraminiferal records combined with several paleoceanographic indices provide insights into the centennial scale hydrographic and trophic level evolution and ecosystem dynamics of WBoB. Our findings demonstrate four different regimes of monsoon-induced fluctuations in the upper water column structure and productivity changes during the Roman Warm Period (RWP), Dark Age Cold Period (DACP), Medieval Climate Anomaly (MCA), and Medieval Climate Anomaly-Little Ice Age (MCA-LIA) transition. We concluded that oligotrophic conditions along with stratified upper water column prevailed during RWP and MCA due to intensified southwest monsoon and related river discharge. Enhanced eutrophication during the DACP and MCA-LIA transition, associated with the significant upward movement of nutrient-rich subsurface water to the photic zone caused by the strengthened Northeast (NE) monsoon winds. Overall, our findings indicate that the ocean surface hydrographic structure and productivity dynamics in the WBoB were modulated by the concurrent phases of enhanced precipitation during the SW monsoon and dry reverse wind circulation during the NE monsoon respectively.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"670 ","pages":"Article 112971"},"PeriodicalIF":2.6,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874551","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}

{"title":"Organic matter sources and productivity variations in the southeastern Bay of Bengal in the past 54,000 years","authors":"Maria C. Fernandes ,&nbsp;Tyson Sebastian ,&nbsp;Sunil Vadakkepuliyambatta ,&nbsp;Pratheeksha Nayak ,&nbsp;Madhusudan G. Yadava ,&nbsp;Palayil John Kurian","doi":"10.1016/j.palaeo.2025.112970","DOIUrl":"10.1016/j.palaeo.2025.112970","url":null,"abstract":"<div><div>Primary productivity in the Bay of Bengal (BoB) has been primarily controlled by salinity stratification driven by the Indian summer monsoon (ISM). The increase in freshwater influx during enhanced ISM periods results in strong salinity stratification, which inhibits the vertical mixing of nutrients and limits primary production. The southern BoB receives relatively less freshwater influx compared to the northern BoB. However, very few studies have been carried out concerning productivity variation in the southern BoB. Hence, to understand the organic matter sources and productivity variation, a sediment core (MGS 22/01) collected from southeastern BoB was analysed for total organic carbon (TOC), total nitrogen (TN), and stable isotopes (δ¹³C, δ¹⁵N), Calcium Carbonate (CaCO₃), Barium (Ba), and for paleoredox condition, Manganese (Mn)/Aluminum (Al) proxy was used. Results indicated relatively more terrestrial-derived organic matter (OM) during ∼54 cal ka BP up to 15 cal ka BP and relatively low input after ∼15 cal ka BP, controlled by sea level and ISM. Low TOC and high Mn/Al indicated prevailing oxic conditions during ∼12 to 6 cal ka BP. High marine productivity was observed during the early MIS 3, LGM, and the mid-late Holocene period. Strong ISM resulted in weaker marine productivity, and weak ISM enhanced marine productivity in the present study area.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"670 ","pages":"Article 112970"},"PeriodicalIF":2.6,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143870347","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}

{"title":"Paleoceanographic changes along the western Spitsbergen margin, evidence from planktic microfossil during the last 10 kyr BP","authors":"Fiorenza Torricella ,&nbsp;Caterina Morigi ,&nbsp;Viviana Gamboa-Sojo ,&nbsp;Katia Carbonara ,&nbsp;Laura Bronzo ,&nbsp;Renata G. Lucchi","doi":"10.1016/j.palaeo.2025.112940","DOIUrl":"10.1016/j.palaeo.2025.112940","url":null,"abstract":"<div><div>Marine microfossils record oceanographic changes that are closely linked to climate variability. We use diatoms, planktic foraminifera, and calcareous nannofossils to reconstruct the paleoceanographic evolution along the western margin of Spitsbergen (Arctic) during the last 10 kyr BP. The data are compared with other records from the western margin of Spitsbergen. We recognize three distinct units corresponding to the late phase of the early Holocene, the middle Holocene, and the late Holocene.</div><div>The results indicate warm sea surface conditions along the western margin of Spitsbergen from 10 to 7.5 kyr BP, simultaneous to a maximum of summer insolation. Maximum advection of North Atlantic Water (NAW) occurs between 10 and 9 kyr BP, corresponding to the last part of the Holocene Thermal Maximum (HTM).</div><div>The microfossil association evidenced a gradual cooling of the surface water between 7.4 and 3.8 kyr BP. Surface cooling can be explained by increased water mass exchange with the Arctic Ocean and/or reduced solar insolation. From 3.8 kyr BP, we have evidence of strong seasonality, stratified surface waters, and a slight inflow of NAW. The last 2000 years are characterized by an alternation of warm and cold periods associated with a change in NAW inflow.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"670 ","pages":"Article 112940"},"PeriodicalIF":2.6,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143850341","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}

{"title":"Oak pollen infrageneric classification-based winter temperature reconstruction since the marine isotope stage 5 in Southeast China","authors":"Yinning Tang ,&nbsp;Lu Dai ,&nbsp;Fei Gong ,&nbsp;Junjie Yu ,&nbsp;Jilong Wang ,&nbsp;Weijian Zeng ,&nbsp;Limi Mao ,&nbsp;Zhongjing Cheng ,&nbsp;Longbin Sha","doi":"10.1016/j.palaeo.2025.112957","DOIUrl":"10.1016/j.palaeo.2025.112957","url":null,"abstract":"<div><div>Quantitative reconstructions of Quaternary terrestrial temperatures in the western Pacific are scarce, resulting in a gap in synchronous comparisons between marine and terrestrial paleoclimate proxies. This study reconstructs winter temperatures along the southeastern coast of China since late Marine Isotope Stage (MIS) 5 using infrageneric classification of Oak (<em>Quercus</em> L.) pollen—a dominant broad-leaved taxon in East Asia. A total of 861 oak pollen grains from 15 topsoil samples spanning 11 latitudes were analyzed using scanning electron microscopy, identifying five ornamentation types—rod-like, rod-like vertical, rod-like masked, verrucate, and scattered verrucate—linked to four taxonomic sections. Redundancy analysis showed strong correlations between ornamentation type ratios and the Mean Temperature of the Coldest Quarter (MTCQ). This was further supported by a MaxEnt species distribution model, highlighting MTCQ as a key driver of deciduous oak distribution along the north-south gradient. Using the Transformation Function Method, modern pollen-MTCQ relationships were applied to 967 fossil oak pollen grains from two coastal drilling cores. Results reveal fluctuating MTCQ over time: slightly cooler conditions during late MIS5, marginally warmer conditions in early and middle MIS3, and significant cooling events in late MIS3 (−3.6 °C with 1.96 °C root mean square error) and the early Holocene. These late MIS3 cooling events align with changes in the Atlantic Meridional Overturning Circulation (AMOC), indicating that East Asian winter temperatures are sensitive to AMOC intensity. Additionally, tropical climate processes, reflected in shifts in the western-to-eastern Pacific temperature gradient, appear to have influenced regional climate dynamics during MIS3. Therefore, this study highlights the complex teleconnections between high- and low-latitude climate systems, offering valuable insights into past climate variability. Furthermore, the MTCQ reconstruction derived from oak pollen data exhibited strong consistency with an independent, full pollen-based reconstruction. This close correspondence suggests that oak pollen can be a valuable proxy for paleoclimate estimation, supporting its utility in paleoclimatic studies.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"671 ","pages":"Article 112957"},"PeriodicalIF":2.6,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143882803","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}

{"title":"Dust supply to the West Philippine Sea since the Middle Pleistocene and distinct influences of the Westerlies after the Mid-Brunhes Event","authors":"Yun Cai ,&nbsp;Dong Xu ,&nbsp;Haifeng Wang ,&nbsp;Yanping Chen ,&nbsp;Haiyan Jin ,&nbsp;Yibing Li ,&nbsp;Weiwei Chen ,&nbsp;Liang Yi","doi":"10.1016/j.palaeo.2025.112961","DOIUrl":"10.1016/j.palaeo.2025.112961","url":null,"abstract":"<div><div>One of the long-standing debates focuses on whether iron (Fe) fertilization enhanced ocean productivity and fueled the biological carbon pump, contributing to glacial CO₂ drawdown. To date, dust flux has been a primary focus, while two other factors, namely dust source and transportation, are generally ignored. In this study, we report high-resolution dust records retrieved from rare earth element variabilities of a sediment core in the West Philippine Sea and discuss the potential linkage between our dust records and driving forces over the last 900 ka. We find an anti-phase relationship between the Ce-based dust record and the Ba-based productivity, both of which are characterized by three astronomical rhythms. By comparing our dust records with various wind proxies, we find that dust input in the study area is closely related to changes in the Westerlies and the East Asian Winter Monsoon, and the Westerlies became the dominant factor after the Mid-Brunhes Event (MBE). Along with the local minimum of obliquity, changes in dust input and ocean productivity are synchronously intensified during the post-MEB glacial periods. Together with comparisons to dust source changes in the inner Asia, we speculate that the strengthening and southward migration of the Westerlies may strengthen the influence of dust sources on marine productivity.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"670 ","pages":"Article 112961"},"PeriodicalIF":2.6,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143852000","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}