Palaeogeography, Palaeoclimatology, Palaeoecology最新文献

{"title":"Timing and structure of the short-lived Dansgaard-Oeschger 6 event in the Asian monsoon system","authors":"Qiyue Li ,&nbsp;Jingjing Lu ,&nbsp;Chenyang Zhang ,&nbsp;Guhan Liu ,&nbsp;Bin Zhao ,&nbsp;Jiaqi Cong ,&nbsp;Yue Yang ,&nbsp;Kan Zhao ,&nbsp;Jinguo Dong ,&nbsp;Hai Cheng ,&nbsp;Yujie Han ,&nbsp;Yijia Liang","doi":"10.1016/j.palaeo.2025.112953","DOIUrl":"10.1016/j.palaeo.2025.112953","url":null,"abstract":"<div><div>The structural features of the Asian monsoon in response to the Dansgaard-Oeschger (DO) event during the last glacial period are important for understanding and investigating the characteristics and dynamical mechanisms of the monsoon climate evolution. Here, based on seven ²³⁰Th dating results and 144 sets of oxygen and carbon isotope (δ¹⁸O and δ¹³C) data from a stalagmite (No. SM5) in Shima Cave, Hunan Province, we reconstruct climatic and environmental evolutions in the East Asian monsoon region, with an average resolution of ∼12 years over the period from 34.1 to 32.6 ka BP. SM5 δ¹⁸O record captures the rapid onset of the DO6 event at ∼33.8 ± 0.1 ka BP, with a negative isotopic bias of ∼1.8 ‰ over several decades, indicative of a fast recovery of the East Asian summer monsoon corresponding to Greenland warming. Considering the published stalagmite records with independent ²³⁰Th dating from the East Asian and the South American monsoon regions, we suggest that the DO6 should have started at ∼33.8 ± 0.1 ka BP and ended at ∼33.4 ± 0.1 ka BP, with a duration of ∼0.4 ± 0.1 ka BP. This further supports the accuracy of GICC05 chronology for Greenland ice cores surrounding this time interval. Besides, a “double peak” structure of DO6 Interstadial is observed in high-resolution mid- to low-latitude geological records and the CH₄ record but is missing in Greenland temperature record. These lines of evidence show that while the Asian monsoon was able to respond rapidly to northern high-latitude climates, it also featured centennial-scale oscillations possibly unique to the mid- to low-latitude regions.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"670 ","pages":"Article 112953"},"PeriodicalIF":2.6,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143845237","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":"Late Oligocene paleosols in the Haltang Basin of northeastern Tibetan Plateau and their implications for the early extent of the Asian monsoon","authors":"Zhaobin Zhang ,&nbsp;Shuang Dai ,&nbsp;Xinnan Fang ,&nbsp;Xiaojun Ma ,&nbsp;Yufan Zhang ,&nbsp;Zhongzhao Ding ,&nbsp;Lingfeng Qin ,&nbsp;Chunyan Li ,&nbsp;Meng Zhou ,&nbsp;Tianqi Ji ,&nbsp;Jie Yang","doi":"10.1016/j.palaeo.2025.112952","DOIUrl":"10.1016/j.palaeo.2025.112952","url":null,"abstract":"<div><div>The Asian monsoon is thought to have established its present-day pattern and extent by ∼26 Ma. In this paper, we report a succession of Late Oligocene (∼23.94 Ma) luvic calcisols in the Haltang Basin, northeastern Tibetan Plateau, which allow us to evaluate the early history of the monsoon. The paleosols contain calcareous nodules and iron‑manganese cutans, and magnetic mineral content fluctuates in different horizons. These features indicate that paleosols formed in a humid climate, characterized by seasonal precipitation and eluviation. Analysis of the goethite/hematite ratio, burial depth and thickness of the Bk horizons, yield a paleoprecipitation estimate of 398–748 mm with a seasonal fluctuation of 88 mm. The mean annual temperature is estimated as ∼12 °C based on carbonate clumped isotope data from a carbonate nodule. This probably indicates a relatively lower elevation at that time. These palaeotemperature estimates, in combination with paleosol data and other proxies in the northeastern Tibetan Plateau, indicate that the Asian monsoon had onset in the Haltang Basin at ∼23.94 Ma. This suggests that the Asian monsoon was more widespread during the late Oligocene than it is today.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"670 ","pages":"Article 112952"},"PeriodicalIF":2.6,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143845238","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":"Shell sclerochronology of the limpet Patella ferruginea Gmelin, 1791: Implications for growth patterns and reconstruction of past sea surface temperatures","authors":"Igor Gutiérrez-Zugasti ,&nbsp;Roberto Suárez-Revilla ,&nbsp;Asier García-Escárzaga ,&nbsp;Leon J. Clarke ,&nbsp;Bernd R. Schöne ,&nbsp;Jara Pascual-Revilla ,&nbsp;José Carlos García-Gómez ,&nbsp;João Zilhão ,&nbsp;Josefina Zapata ,&nbsp;Arnaldo Marín","doi":"10.1016/j.palaeo.2025.112954","DOIUrl":"10.1016/j.palaeo.2025.112954","url":null,"abstract":"<div><div>Understanding the environmental conditions faced by past human populations is essential to understand their behaviour, and the subsistence strategies that they adopted for survival. The study of oxygen isotope ratios in limpet shells (δ¹⁸O_shell) can provide important information on sea surface temperature (SST), shell growth patterns and the season of shell collection by human populations. Following this approach, in this paper, we assessed δ¹⁸O_shell values of three modern limpets <em>Patella ferruginea</em> Gmelin, 1791 collected alive in Ceuta (northern Africa) as proxies for past SST and to determine the season of shell collection at archaeological sites. Studied shells showed fast growth rates without long periods of growth stops. However, results suggested that the shells did not grow during all tidal immersions. Results also showed higher growth rates between winter and summer, although each shell exhibited its own distinctive patterns. According to the isotope data, studied limpets deposited calcium carbonate to form their shells with an average offset of +0.34 ‰ from expected equilibrium. This offset was higher in summer (0.56 ‰) and lower in winter (0.18 ‰). Reconstructed sea surface temperature (SST_δ18O) exhibited high correlation with satellite temperature. Considering the variability of the oxygen isotope composition of the seawater (δ¹⁸O_sw), past SST_δ18O can be calculated with an uncertainty of +2 °C and −1.4 °C. Our study demonstrates that δ¹⁸O values of <em>P. ferruginea</em> can be used to reconstruct SST provided that the δ¹⁸O_sw is known. Furthermore, the season of shell collection can be estimated from δ¹⁸O_shell curves, which has deep implications for future archaeological investigations.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"670 ","pages":"Article 112954"},"PeriodicalIF":2.6,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143845236","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":"Middle Triassic humidification in Southern North China linked to northward propagation of Qinling Orogenic Belt","authors":"Wentao Yang ,&nbsp;Wenguang Tang ,&nbsp;Jianghai Yang ,&nbsp;Hongyu Zhang ,&nbsp;Yuansheng Du","doi":"10.1016/j.palaeo.2025.112948","DOIUrl":"10.1016/j.palaeo.2025.112948","url":null,"abstract":"<div><div>Orogenic uplift can change landscape topography and influence regional climatic conditions. However, it is generally hard to track the causal linkage of regional climate change with orogenesis from geological records due to lack of direct correlations between climatic and tectonic evolution. During the early-middle Triassic, there was a subarid to subhumid climate shift in Southern North China along with the formation of the Qinling Orogenic Belt. To further understand the early-middle Triassic climate shift and its potential linkage with the Qinling orogenesis, two early-middle Triassic successions through the upper Heshanggou to Ermaying formations in the Jiyuan area in Southern North China Basin were studied by sedimentology, paleosols and detrital zircon provenance analysis. The paleosols are characterized by calcareous nodule horizons and have morphological features of calcic paleosols. Based on depth to the calcareous nodule horizon of the observed paleosols, regional precipitation was estimated and showed an increase from less than 420 to more than 800 mm/yr in the lower Ermaying Formation. This climate humidification is accompanied by the fluvial to deltaic facies transition and postdates a significant provenance change recorded by the detrital zircon U<img>Pb ages. Detrital zircons from the Heshanggou Formation exhibit two primary U<img>Pb age groups of 530–380 Ma and 1100–700 Ma, indicating a dominant provenance from the North Qinling Belt. In contrast, detrital zircons from the Ermaying Formation show three major U<img>Pb age groups of 2900–2300 Ma, 2100–1650 Ma, and 330–230 Ma, pointing to a provenance from the Southern Margin of North China. This provenance shift can be interpreted as indicative of the northward propagation of the orogenic uplift. In this context of tectonic evolution, we proposed that the increased precipitation in the Southern North China was related to the orogenic uplift to the south. This study enhances our understanding of the interactions between climate and tectonics from geological record.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"669 ","pages":"Article 112948"},"PeriodicalIF":2.6,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820687","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":"Holocene coastal evolution and paleogeography of the Izumo Plain and Lake Shinji, Western Japan: Incised-valley fills in a wave-dominated estuary environment","authors":"Aan Dianto ,&nbsp;Kota Katsuki ,&nbsp;Tetsuya Sakai ,&nbsp;Koji Seto ,&nbsp;Toshimichi Nakanishi ,&nbsp;Toko Tanaka ,&nbsp;Iori Miura ,&nbsp;Akira Hayashida ,&nbsp;Toshiaki Irizuki ,&nbsp;Yoshikazu Sampei ,&nbsp;Akira Tsujimoto ,&nbsp;Masami Watanabe ,&nbsp;Takuto Ando ,&nbsp;Yasuhide Nakamura ,&nbsp;Yoshiki Saito","doi":"10.1016/j.palaeo.2025.112941","DOIUrl":"10.1016/j.palaeo.2025.112941","url":null,"abstract":"<div><div>The sedimentary infill of the Izumo Plain was studied with emphasis on the influence of coastal evolution and paleogeography. The Izumo Plain and Lake Shinji belong to Paleo-Shinji Bay, an east-west incised valley formed during the Last Glacial Maximum and drowned by the early Holocene sea-level rise. Using micro-XRF, CNS elemental analysis, grain size, diatom analysis, and robust radiocarbon dates for three newly collected cores from the plain, complemented by three previously studied cores from the plain and Lake Shinji, five depositional phases have been identified. The phases include estuarine to coastal plain (up to 9.8 cal. kyBP), transgressive central basin (9.8–7.7 cal. kyBP), regressive central basin (7.7–3.7 cal. kyBP), regressive inner central basin (3.7–0.7 cal. kyBP), and delta front (&lt;0.7 cal. kyBP). Beginning at ∼10.2 cal. kyBP, marine inundation caused by early Holocene sea-level rise shifted deposition from fluvial gravel to muddy sediment in the transgressive central basin. The high sediment accumulation during the transgression suggests that coastal erosion transported sediment into the bay. The regressive central basin, driven by decelerated sea-level rise, is characterized by thinly laminated muddy sediments deposited at a lower accumulation rate due to the shallowness of the bay mouth and the topography of the depression, resulting in anoxic conditions. Northward progradation of a bay-side delta began at ∼6.5 cal. kyBP, eventually dividing the regressive central basin into western and eastern basins by ∼3.7 cal. kyBP, with the eastern inner basin evolving into a more enclosed environment. By 0.7 cal. kyBP, intensified bay-side delta expansion, caused by a change in the main river channel, partially filled the eastern inner basin and formed the Izumo Plain. However, the unfilled estuary, now known as Lake Shinji, remained in a coastal lake. The infill history of Paleo-Shinji Bay was characterized by rapid marine sediment accumulation during the early Holocene sea-level rise, followed by bay-side delta progradation during the later Holocene under relatively stable to falling sea levels, providing insights into the evolution of estuarine infill in wave-dominated systems.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"670 ","pages":"Article 112941"},"PeriodicalIF":2.6,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143839342","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":"Li/Ca of modern brachiopods: A potential paleoseawater thermometer","authors":"Uwe Brand ,&nbsp;Claire Rollion-Bard ,&nbsp;Karem Azmy ,&nbsp;M. Aleksandra Bitner ,&nbsp;Alan Logan ,&nbsp;Erika Griesshaber ,&nbsp;Maria Simonet Roda ,&nbsp;Wolfgang W. Schmahl ,&nbsp;Sandra Gordillo ,&nbsp;Nima Vaez-zadeh Asadi ,&nbsp;Elizabeth Harper ,&nbsp;Audrey K. Morrison","doi":"10.1016/j.palaeo.2025.112928","DOIUrl":"10.1016/j.palaeo.2025.112928","url":null,"abstract":"<div><div>Lithium in marine carbonates may hold key information about their temperature of formation and thus of the thermal history of ambient seawater. Here, we present Li/Ca, Mg/Ca, and Sr/Ca results of modern rhynchonelliformean brachiopods from high to low latitudes, shallow to deep and warm to cold seas covering the world's oceans.</div><div>Craniids as a group incorporate Li into their shell at a faster rate than any other brachiopod group, and due to their paucity will not be considered contributing material. The primary layer calcite of rhynchonelliformean brachiopods, due to the highly variable nature of its Li content, is deemed unsuitable as a proxy. In contrast, the Li/Ca ratios of fibers of the secondary layer within Terebratulida and Rhynchonellida, in conjunction with the innermost calcite of the Thecideida, appear to be free of major influence by growth rate, water depth, seawater pH and salinity. We compiled Li/Ca thermometers based on: 1) second-layer fiber-calcite Li results [2LB, N_G = 57], and 2) with additional Li/Ca results of thecideide calcite [2LBT, N_G = 60]. The proposed Li/Ca-brachiopod seawater thermometers (linear 1 and 2), which are independent of seawater chemistry, are as follows:</div><div>T°C = 32.85 (±0.52) – 0.670 (±0.014) Li/Ca_2LB (μmol/mol) r² = 0.978<!--> <!-->(1)</div><div>T°C = 34.73 (±0.37) – 0.716 (±0.010) Li/Ca_2LBT (μmol/mol) r² = 0.987<!--> <!-->(2)</div><div>Brachiopods are important biocalcifiers especially during the Paleozoic, and thus, the proposed Li/Ca thermometer may be an invaluable supplementary tool to the oxygen and clumped isotope thermometers in characterizing its seawater and climate history.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"669 ","pages":"Article 112928"},"PeriodicalIF":2.6,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817540","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":"Detrital zircon evidence for the evolution of the Paleo-Asian Ocean and Pangea scenarios during late Paleozoic times","authors":"Zeyu Wang ,&nbsp;Fuxiang Li ,&nbsp;Qiang Ren ,&nbsp;Shi Sun ,&nbsp;Jian Luo ,&nbsp;Anqing Chen","doi":"10.1016/j.palaeo.2025.112925","DOIUrl":"10.1016/j.palaeo.2025.112925","url":null,"abstract":"<div><div>The Central Asian Orogenic Belt (CAOB) is one of the Earth's largest and longest-lived accretionary orogenic collages, consisting of numerous accretionary prisms, magmatic arcs, ophiolites and microcontinents. The Solonker and Hegenshan suture zones in the eastern CAOB record the Late Paleozoic closure of the Paleo-Asian Ocean; however, closure times and variability remain uncertain, and there are ongoing disputes about how East Asian blocks linked with the Pangea supercontinent. In this paper, we report detrital zircon U-Pb ages and trace elements from the eastern CAOB, which indicate that the Northern Orogenic Belt received sediment from the Uliastai active continental margin of the Mongolia Block during Pennsylvanian times. In Early to Middle Permian times, the Northern Orogenic Belt exhibited an internal detrital source with a single age cluster, demonstrating its isolation on both north and south sides, flanked by the Solonker and Hegenshan oceans. However, from Late Permian to Early Triassic times, the sediments of the Northern Orogenic Belt along with adjacent areas displayed a mixed exotic provenance derived from both the North China Block and Mongolia Block, providing evidence for the simultaneous closure of both the Solonker and Hegenshan oceans. The source-to-sink system during the assembly of the Mongolia Block and North China Block further demonstrates a weak connection to the Laurussia supercontinent. These findings highlight the global tectonic evolution from Pangea B to A during the Late Paleozoic.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"669 ","pages":"Article 112925"},"PeriodicalIF":2.6,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143799265","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":"Changes in the relationship between temperature and precipitation during the Holocene recorded by the sediments of Yangying Co, eastern Tibetan Plateau","authors":"Peiyao Xu,&nbsp;Duo Wu,&nbsp;Qili Xiao,&nbsp;Tao Wang,&nbsp;Shilong Guo,&nbsp;Jinghua Huang,&nbsp;Lili Pan,&nbsp;Mengjing Li","doi":"10.1016/j.palaeo.2025.112937","DOIUrl":"10.1016/j.palaeo.2025.112937","url":null,"abstract":"<div><div>The Indian summer monsoon (ISM) is an important component of the Asian monsoon system. It transports moisture and heat from the ocean to mid- and low-latitude regions, which influence their climate and ecology. Under the influence of the Asian summer monsoon, temperature and precipitation in East Asia vary synchronously on the seasonal scale; however, this relationship was decoupled on the decadal scale over the past century, and on millennial or even longer time scales. In the context of the “Holocene temperature conundrum” and seasonal temperature reconstructions, the relationship between temperature and precipitation variations in the ISM region during the Holocene has been found to be increasingly complex. This study focuses on Yangying Co on Haizi Mountain, on the southeastern Tibetan Plateau. We obtained a high-quality, 475-cm-long, continuous sediment core (Yangying Co 2022B) from the lake center, which was dated using analyses of ¹³⁷Cs, ²¹⁰Pb, and AMS ¹⁴C. After evaluating the carbon reservoir effect, a reliable chronology was established for this core since 15 ka (1 ka = 1000 years). Sedimentological proxies (grain size) and geochemical proxies (XRF elements, TOC, TN, organic matter content) were used to reconstruct the history of glacier activity during the last deglaciation, and temperature and precipitation changes during the Holocene. The changes in TOC, TN, organic matter content, and Br (reflecting biomass variations) reveal a gradual increase in biomass in the Yangying Co region during the early Holocene, which reached a maximum during the middle Holocene and then decreased. The biomass is primarily controlled by summer temperature changes, and our Holocene summer temperature record shows a warming–thermal maximum–cooling temporal pattern. The gradual decrease in PC1 of scanning XRF data and in mean grain size during the Holocene indicate a weakening of the ISM. Influenced by cloud cover, dust flux, volcanic activity, and snow/ice albedo, the precipitation and summer temperature in the ISM region of the Tibetan Plateau were decoupled during the early Holocene (11.6–6 cal kyr BP). However, after ∼6 cal kyr BP, both precipitation and summer temperature decreased, possibly influenced by the decreasing Northern Hemisphere summer insolation. Our findings contribute to an improved understanding of current and future regional and global climate changes.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"669 ","pages":"Article 112937"},"PeriodicalIF":2.6,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817539","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 condition changes in the Eastern Bransfield Basin, Antarctic Peninsula, since the late glacial interval and its implications","authors":"Sunghan Kim ,&nbsp;Young-Suk Bak ,&nbsp;Kyu-Cheul Yoo ,&nbsp;Min Kyung Lee ,&nbsp;Jae Il Lee ,&nbsp;Sookwan Kim ,&nbsp;Jinku Park ,&nbsp;So-Young Kim ,&nbsp;Heung Soo Moon ,&nbsp;Myung-Il Kang ,&nbsp;Hyo Jin Kim","doi":"10.1016/j.palaeo.2025.112934","DOIUrl":"10.1016/j.palaeo.2025.112934","url":null,"abstract":"<div><div>Antarctic Peninsula is the most northerly area in the Antarctica, thus it is vulnerable to warming climate. Although it is well known that relatively warm water mass input onto the Antarctic shelf region facilitates ice shelf retreat, when and how the water mass exchange between the deep Southern Ocean and the Antarctic shelf regions is not well known in ice proximal areas due to sea ice dynamics on the continental shelf region. Here, we document the diatom assemblage record of a sediment core with high sedimentation rates since the late glacial interval from 34.6 ka to address surface environmental changes in the Eastern Bransfield Basin (EBB). We found that the EBB was covered by extensive sea ice showing millennial-scale variations during the late glacial interval. The sea ice started to decrease during the deglacial interval (19–11 ka) with slight increases of open ocean influence. In addition, meltwater input was significant during 14.7–11.3 ka which corresponds to Antarctic Ice Sheet Discharge events reported in the Scotia Sea including Meltwater pulse 1A and 1B. During the Holocene after 9 ka, relatively warm water mass input distinctively increased into the EBB contemporaneous with a remarkable decrease in sea ice influence indicating the strong relationship between sea ice and warm water mass input. In addition, meltwater input at 9 ka was also distinctive in the EBB, but there was no corresponding Antarctic Ice Sheet Discharge event in the Scotia Sea. Our results show how well surface environmental changes in the EBB correspond to the global climate change and the regional climatic characteristics at the same time.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"669 ","pages":"Article 112934"},"PeriodicalIF":2.6,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820686","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":"Extreme flood events on Western Sakhalin and their linkage to cyclogenesis activity in the western North Pacific in middle-late Holocene","authors":"N.G. Razjigaeva ,&nbsp;L.A. Ganzey ,&nbsp;T.A. Grebennikova ,&nbsp;V.I. Ponomarev ,&nbsp;V.V. Afanasiev ,&nbsp;A.O. Gorbunov ,&nbsp;M.A. Klimin","doi":"10.1016/j.palaeo.2025.112933","DOIUrl":"10.1016/j.palaeo.2025.112933","url":null,"abstract":"<div><div>This study provides insights into the natural variability of flood events in the past and the role of large-scale atmospheric circulation patterns in shaping flood patterns. The geological record of extreme floods associated with the passage of the strongest typhoons and deep extratropical cyclones over the past 6370 years has been reconstructed in Western Sakhalin (the Yablochnaya River Basin). A section of peat bog with numerous loam layers formed during extreme floods was used for the reconstruction. A recent analog of such events is typhoon Phyllis (1981 CE), which produced up to 300 mm of rainfall. The analysis of ash content (i.e., non-organic content) in peat, combined with the age-depth model, allows for identifying of 38 past flood events and periods of weaker floods when organomineral sediments accumulated. During active cyclogenesis periods, extreme floods were frequent once every 10–30 years. The analysis of paleoclimatic conditions provides insights into the climate factors contributing to flood risk. Long-term periods with extreme floods were identified as 6470–5490, 4300–3670 yr BP according to the age-depth model. During the last 3110 years, severe floods were rare events. We compare the records of strong floods from the western and eastern coasts of South Sakhalin and different East Asian regions. Periods with frequent strong paleotyphoons and deep extratropical cyclones show different temporal variations in the regions, which could be due to variance cyclone trajectories determined by the anomalies of baric fields. Intensification of the warm Kuroshio Current, which plays a major role in meridional heat and moisture transport, was also a driver of cyclogenesis activation and extreme flooding in southern Sakhalin Island. At present, the increase in the intensity of cyclogenesis and the frequency of typhoons in the middle-late Holocene was closely related to the western Pacific warm pool in the western equatorial Pacific, manifestation of El Niño and anomalies of atmospheric centers of action. This information enhances our understanding of flood history and provides valuable insights for flood risk assessment and climate change adaptation strategies.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"669 ","pages":"Article 112933"},"PeriodicalIF":2.6,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808661","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}