Palaeogeography, Palaeoclimatology, Palaeoecology最新文献

{"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":"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}

{"title":"Improving the temporal resolution of middle Eocene–late Oligocene foraminiferal biomagneto-chronology: Insights from CONOP and chronologic significance of biotic events","authors":"Zhengbo Lu ,&nbsp;Junxuan Fan ,&nbsp;Bridget S. Wade ,&nbsp;James Ogg ,&nbsp;Laia Alegret ,&nbsp;Peter M. Sadler ,&nbsp;Michael H. Stephenson ,&nbsp;Yukun Shi ,&nbsp;Chao Qian ,&nbsp;Ke Xue ,&nbsp;Peiyue Fang","doi":"10.1016/j.palaeo.2025.112929","DOIUrl":"10.1016/j.palaeo.2025.112929","url":null,"abstract":"<div><div>To understand Earth's history, a comprehensive time scale integrating available stratigraphic information is crucial. The middle Eocene to late Oligocene offers abundant stratigraphic information, including foraminiferal and magnetostratigraphic data. However, traditional biostratigraphy uses only a small fraction (1–10 %) of foraminifera as markers, reducing the time scale's temporal resolution and lacking a quantitative method to assess the chronologic significance of both mearker and non-marker biotic events. This study employs the quantitative stratigraphic method, Constrained Optimization (CONOP), using 11 reference sections to create a high-resolution magneto-foraminiferal time scale for the middle Eocene–late Oligocene. The new composite sequence improves temporal resolution by nearly tenfold over traditional methods, incorporating 409 additional biotic events while aligning closely with established markers. Two evaluation factors, diachrony and centrality, were developed to assess the temporal consistency of events among different locations and geographic ranges. Findings reveal that the chronological significance of small benthic foraminifera, planktonic foraminifera, and foraminiferal zonal species events increases sequentially. Conversely, larger benthic foraminiferal events are affected by endemism, complicating their evaluation. Incorporating magnetostratigraphic data into CONOP enhances the robustness and accuracy of stratigraphic correlation. Our approach offers a way to apply CONOP for high-resolution time scales, allowing for a comprehensive assessment of biotic events beyond the use of zonal fossils.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"669 ","pages":"Article 112929"},"PeriodicalIF":2.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143786223","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":"Quantifying the equatorial climate shifts in the Indo-Burma range using late Eocene–early Oligocene leaf fossils","authors":"Harshita Bhatia ,&nbsp;Kapesa Lokho ,&nbsp;Gaurav Srivastava ,&nbsp;O. Chonchibeni Ezung","doi":"10.1016/j.palaeo.2025.112931","DOIUrl":"10.1016/j.palaeo.2025.112931","url":null,"abstract":"<div><div>The late Eocene–early Oligocene geological time span saw significant Antarctic glaciation, which played a crucial role in shaping global climate patterns and influencing regional climates and ocean circulation changes. In this study, we quantitatively reconstructed the climate of a low latitude site using fossil leaf morphological traits recovered from the Laisong Formation (late Eocene–early Oligocene) of the Indo-Burma range. The Climate Leaf Analysis Multivariate Program was used to quantify the climate, suggesting a mean annual temperature of 25.3 ± 2.3 °C and a cold month mean temperature of 19.2 ± 3.5 °C. The length of the growing season extended throughout the year, with a mean annual precipitation of 244.2 ± 64.3 cm, showing clear rainfall seasonality between rainy summers (130 ± 40 cm) and dry winters (21.7 ± 9.8 cm). The study further reveals that high rainfall in the low latitude region resulted from the northward migration of the intertropical convergence zone due to Antarctic glaciation.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"669 ","pages":"Article 112931"},"PeriodicalIF":2.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143783230","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":"Small shelly fauna biodiversity from reef-adjacent facies of the lower Cambrian Harkless Formation, Nevada","authors":"Casey C. Bennett,&nbsp;Clare Mate,&nbsp;Sarah M. Jacquet","doi":"10.1016/j.palaeo.2025.112922","DOIUrl":"10.1016/j.palaeo.2025.112922","url":null,"abstract":"<div><div>Cambrian archaeocyathid reef systems represent the earliest metazoan-dominated topographically complex bioconstructions in the rock record and provide valuable insights into community composition with respect to the major framework builders and their small shelly fossil (SSF) inhabitants. This study quantified variations in the composition of SSF assemblages (richness, evenness, and diversity) in relation to proximity to biohermal facies of the lower Cambrian (Series 2, Stage 4) Harkless Formation in southern Esmeralda County, Nevada. Combining petrographic and quantitative analyses with a systematic review of the SSFs reveals a low diversity, but abundant assemblage. Trends in species richness, evenness and diversity show no consistent patterns in distance from the reef across the measured sections. However, lithology serves as a major control in determining SSF biofacies, with select fauna exhibiting evidence of taphonomic controls. More research is needed to investigate spatial relationships of shelly faunas across these ancient carbonate archaeocyathid reefs and platforms to determine the role early reef habitats have on local biodiversity.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"669 ","pages":"Article 112922"},"PeriodicalIF":2.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808660","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":"Precipitation patterns and variability in Tropical Americas during the Holocene","authors":"Paula R. Bianchini ,&nbsp;Luciana F. Prado ,&nbsp;Elder Yokoyama ,&nbsp;Ilana Wainer ,&nbsp;Iuri Gorenstein ,&nbsp;Francesco S.R. Pausata","doi":"10.1016/j.palaeo.2025.112935","DOIUrl":"10.1016/j.palaeo.2025.112935","url":null,"abstract":"<div><div>The Tropical Americas (TA) have monsoons as the dominant feature of their hydroclimate. Precipitation in this region is influenced by the American Monsoon System (AMS). Throughout the Holocene, several global climate changes occurred that modified precipitation patterns in this region. Here we identify a general trend of increasing precipitation in the TA over the last 11,700 years. We analyzed different precipitation datasets, as paleorecords from lake sediments and speleothems, and Transient Climate Simulation of the Last 21,000 Years (TraCE-21ka) model results. We also identified occasional shifts in the TA's precipitation during the Holocene, with variations in the pattern of precipitation anomalies around 9,000 to 8,000 years, corroborated by high-energy wavelet analysis signals detected before 7,710 years. These results show that TA's precipitation was influenced by the final collapse of the North American ice sheets, accelerated by increased summer insolation in Northern Hemisphere (NH).</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"669 ","pages":"Article 112935"},"PeriodicalIF":2.6,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143783231","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}