Global and Planetary Change最新文献_第7页

Environmental conditions controlling cold-water coral growth in the southern Alboran Sea since the last deglaciation 自最后一次冰川消退以来，控制阿尔伯兰海南部冷水珊瑚生长的环境条件

IF 4 1区地球科学

Global and Planetary Change Pub Date : 2025-03-11 DOI: 10.1016/j.gloplacha.2025.104792

Mar Selvaggi , Maria de la Fuente , José N. Pérez-Asensio , Claudio Lo Iacono , Albert Català , Sergio Trias-Navarro , Guillem Corbera , Sara Campderrós , Negar Haghipour , Letizia Di Bella , David Van Rooij , Isabel Cacho

{"title":"Environmental conditions controlling cold-water coral growth in the southern Alboran Sea since the last deglaciation","authors":"Mar Selvaggi , Maria de la Fuente , José N. Pérez-Asensio , Claudio Lo Iacono , Albert Català , Sergio Trias-Navarro , Guillem Corbera , Sara Campderrós , Negar Haghipour , Letizia Di Bella , David Van Rooij , Isabel Cacho","doi":"10.1016/j.gloplacha.2025.104792","DOIUrl":"10.1016/j.gloplacha.2025.104792","url":null,"abstract":"<div><div>Cold-water coral (CWC) mounds are commonly found in the Alboran Sea (westernmost Mediterranean), specifically in the so-called East and West Melilla mound provinces. This study presents a multi-proxy analysis on the environmental changes that occurred in west Melilla since the last deglaciation (∼14 kyr), based on the on-mound core MD13–3451 (∼370 m). The analyses performed include geochemical measurements of foraminiferal coatings (U/Mn) and skeletal calcite (stable oxygen and carbon isotopes, Mg/Ca-derived deep-water temperatures). Furthermore, the seawater δ<sup>18</sup>O (δ<sup>18</sup>O<sub>sw</sub>) and the ice-volume-corrected seawater δ<sup>18</sup>O (δ<sup>18</sup>O<sub>sw-ivc</sub>) have been estimated via paired analyses of Mg/Ca and δ<sup>18</sup>O<sub>carbonate</sub>. Our findings suggest that i) pulses of relatively warm deep-water during the last mound flourishing stage, here-referred to as ‘Cold Water Coral - Growth Phase 1’ (CWC-GP1; ∼11–9 kyr), triggered a shift in coral species dominance in the west Melilla province, and ii) a rapid freshening of the waters occurred during CWC-GP1, indicating significant hydrographical changes. To further interpret these results, we combined them with comparable records from neighboring sites. We find that CWC-GP1 is closely coupled with a reorganization of the Alboran Sea water column. More precisely, we discuss the potential emergence of a western Mediterranean intermediate sourced water, which partly replaced intermediate waters from eastern Mediterranean sources and contributed to the enhanced hydrodynamics of the region. We further propose that the interplay between strong near-bottom currents and increased upwelling conditions may have played a crucial role in controlling CWC growth dynamics.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"249 ","pages":"Article 104792"},"PeriodicalIF":4.0,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Monsoon variability and high latitude climate signals in the central Mediterranean at the Pliocene – Pleistocene transition: the Gelasian stratotype section (Monte San Nicola, Sicily) 上新世-更新世过渡时期地中海中部季风变异性和高纬度气候信号：格拉西亚层型剖面（Monte San Nicola，西西里岛）

IF 4 1区地球科学

Global and Planetary Change Pub Date : 2025-03-11 DOI: 10.1016/j.gloplacha.2025.104788

Marina Addante , Timothy D. Herbert , Angela Girone , Antonio Caruso , Maria Marino , Giovanna Scopelliti , Stefano Fasone , Patrizia Maiorano

{"title":"Monsoon variability and high latitude climate signals in the central Mediterranean at the Pliocene – Pleistocene transition: the Gelasian stratotype section (Monte San Nicola, Sicily)","authors":"Marina Addante , Timothy D. Herbert , Angela Girone , Antonio Caruso , Maria Marino , Giovanna Scopelliti , Stefano Fasone , Patrizia Maiorano","doi":"10.1016/j.gloplacha.2025.104788","DOIUrl":"10.1016/j.gloplacha.2025.104788","url":null,"abstract":"<div><div>An integrated high-resolution climate framework is reconstructed at the Monte San Nicola GSSP section (Southern Sicily), the type-section for the Lower Pleistocene Gelasian Stage. Our multiproxy record is based on planktonic foraminiferal stable oxygen isotopes, alkenones and calcareous plankton assemblages, focusing on the interval between ∼2.7 and 2.5 Ma, which includes the Gelasian GSSP. Calcium carbonate content and sediment colour analyses are used to integrate lithological field observations. We provide the first high-resolution Mediterranean Sea Surface Temperature (°C) record, between MIS G4 and the onset of MIS 99 in the Monte San Nicola type-section and extend the calcareous plankton and oxygen isotope dataset published in a previous paper. The results enable to: i) highlight modifications in surface water dynamics related to African monsoon activity and North Atlantic climate variability; ii) strengthen the evidence that the first significant southward migration of the Subarctic Front in the mid-latitudes occurred during MIS 104, slightly below the GSSP, concomitant with strengthening of the winter monsoon over the Chinese loess plateau; iii) reveal the occurrence of millennial-scale variability during glacials, correlated to North Atlantic Ice Rafted Debris events within MIS 104 and MIS 100. The results provide evidence that the paleoclimate and stratigraphic signals are very well preserved in the type-section and further improve the correlation potential of the GSSP outside the type-area.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"249 ","pages":"Article 104788"},"PeriodicalIF":4.0,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Local summer insolation modulated Southern Ocean productivity and Antarctic icesheet evolution since MIS 5 自MIS 5以来，局部夏季日照调节了南大洋生产力和南极冰盖演变

IF 4 1区地球科学

Global and Planetary Change Pub Date : 2025-03-09 DOI: 10.1016/j.gloplacha.2025.104789

Yihao Hu , Thomas J. Algeo , Tong Wang , Jingteng Guo , Zhifang Xiong , Tiegang Li

{"title":"Local summer insolation modulated Southern Ocean productivity and Antarctic icesheet evolution since MIS 5","authors":"Yihao Hu , Thomas J. Algeo , Tong Wang , Jingteng Guo , Zhifang Xiong , Tiegang Li","doi":"10.1016/j.gloplacha.2025.104789","DOIUrl":"10.1016/j.gloplacha.2025.104789","url":null,"abstract":"<div><div>The relationship of marine productivity in the Southern Ocean (SO) to dynamics of the Antarctic icesheet (AIS) since the Late Pleistocene remains uncertain. Here, we investigated Late Pleistocene variation in productivity in the Antarctic Zone of the SO, and the response of the AIS to various potential forcing mechanisms. We analyzed secular variation in multiple biogenic components and ice-rafted debris (IRD) of a sediment core (ANT34/D5–12) from the Atlantic sector of the SO. Productivity, as tracked by the fluxes of excess Ba and opal, was controlled mainly by local mean summer insolation, which also modulated icesheet dynamics, as revealed by IRD. These records nonetheless show distinct precessional variability (∼20 kyr cycle) related to austral summer insolation. During high (low) insolation intervals, productivity was high (low), and the AIS contracted (expanded). Based on these data and published paleoclimate records, we propose that marine productivity and icesheet dynamics during the Late Pleistocene were primarily controlled by local Antarctic summer mean insolation through regulation of water-column stratification depth. These findings support hypotheses for the independent evolution of Antarctic climate (i.e., not paced by Northern Hemisphere summer insolation) and provide new insights into biogeochemical cycling in the SO and AIS dynamics.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"249 ","pages":"Article 104789"},"PeriodicalIF":4.0,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143627844","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}

引用次数: 0

Summer amplification of interannual variability changes in surface air temperature during the last interglacial period 末次间冰期地表气温年际变化的夏季放大

IF 4 1区地球科学

Global and Planetary Change Pub Date : 2025-03-09 DOI: 10.1016/j.gloplacha.2025.104787

Jiawen Shi , Zhiping Tian , Xianmei Lang , Dabang Jiang

{"title":"Summer amplification of interannual variability changes in surface air temperature during the last interglacial period","authors":"Jiawen Shi , Zhiping Tian , Xianmei Lang , Dabang Jiang","doi":"10.1016/j.gloplacha.2025.104787","DOIUrl":"10.1016/j.gloplacha.2025.104787","url":null,"abstract":"<div><div>Temperature variability refers to temperature fluctuations around the mean state, which closely connects with the probability of extreme events. Examining temperature variability during past warm periods in Earth's history is essential for elucidating its future trends. We quantitatively analyze the interannual variability changes in near-surface air temperature and associated mechanisms during the last interglacial period (LIG, ∼127 ka) using the Paleoclimate Modeling Intercomparison Project Phase 4 (PMIP4) models. Relative to the preindustrial period, the LIG interannual variability of temperature increases slightly at the global scale. Summertime variability varies more dramatically at the regional scale, especially in high latitudes, East Asia, and North Africa, where it increases by more than 15 % in comparison to small changes for the winter and annual mean. In high-latitude oceans, radiation fluxes notably contribute to temperature variability change due to sea ice melting. Cloudiness changes dominate enhanced summer temperature variability in East Asia and both tropical land and oceans, while net surface heat flux and atmospheric energy convergence minus storage (CONV) influence other land regions. Additionally, CONV plays a larger role in the mid-to-high latitudes during winter than during summer. In low-latitude oceans, the distribution of temperature variability change is shaped by the mutual compensation between net surface heat flux and CONV. Simulated temperature variability changes generally agree with proxy data, although discrepancies exist in North Asia, East Asia, North Africa, North America, and South America.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"249 ","pages":"Article 104787"},"PeriodicalIF":4.0,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143601653","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}

引用次数: 0

Early Cretaceous deep-water bedforms west of the Guinea Plateau revise the opening history of the Equatorial Atlantic Gateway 早白垩世几内亚高原西部的深水地层改变了赤道大西洋门户的开启历史

IF 4 1区地球科学

Global and Planetary Change Pub Date : 2025-03-07 DOI: 10.1016/j.gloplacha.2025.104777

Debora Duarte , Elisabetta Erba , Cinzia Bottini , Thomas Wagner , Benedict Aduomahor , Tom Dunkley Jones , Uisdean Nicholson

{"title":"Early Cretaceous deep-water bedforms west of the Guinea Plateau revise the opening history of the Equatorial Atlantic Gateway","authors":"Debora Duarte , Elisabetta Erba , Cinzia Bottini , Thomas Wagner , Benedict Aduomahor , Tom Dunkley Jones , Uisdean Nicholson","doi":"10.1016/j.gloplacha.2025.104777","DOIUrl":"10.1016/j.gloplacha.2025.104777","url":null,"abstract":"<div><div>The Equatorial Atlantic Gateway (EAG) was critical to Earth's climatic and oceanographic evolution during the Mesozoic, yet its early opening history remains enigmatic. Here, we present new 2D seismic reflection data and biostratigraphic ages from DSDP Site 367, integrated with tectonic reconstruction models, to constrain the sedimentary response to the evolution of the gateway. Seismic analysis reveals five stratigraphic units (<em>U1</em> to <em>U5</em>) documenting tectonic and oceanographic changes in the Guinea Plateau margin. Morphosedimentary features identified in units <em>U2</em> to <em>U4</em>, including sediment waves and contourite drifts, document changing current dynamics during EAG opening. We propose a two-stage model for the initial gateway opening: <em>i)</em> middle-late Aptian (∼117 to ∼113 Ma) formation of a marginal sea in the western EAG and overflow of Equatorial waters into the Central Atlantic, producing large sediment waves northwest of the gateway, and <em>ii)</em> latest Aptian-late Albian (from ∼113 Ma onwards) widening and deepening of the gateway, establishing more continuous water exchange and leading to the transition into contourite deposition. This direct sedimentary evidence shows the establishment of a marine connection started at around 117 Ma, significantly earlier than previous estimates, and coinciding with the onset of global climate cooling. These findings show the dynamic interplay between gateway opening, ocean circulation, and climate change during the middle Cretaceous, highlighting the pivotal role of ocean gateways in Earth's climate system.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"249 ","pages":"Article 104777"},"PeriodicalIF":4.0,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143592677","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}

引用次数: 0

Undervalued CO2 emissions from soil to the atmosphere in seismic areas: A case study in Tangshan, North China 被低估的地震区土壤向大气的二氧化碳排放量：华北唐山案例研究

IF 4 1区地球科学

Global and Planetary Change Pub Date : 2025-03-02 DOI: 10.1016/j.gloplacha.2025.104778

Le Hu , Ying Li , Zhaofei Liu , Chang Lu , Giovanni Martinelli , Galip Yuce , Jianguo Du

{"title":"Undervalued CO2 emissions from soil to the atmosphere in seismic areas: A case study in Tangshan, North China","authors":"Le Hu , Ying Li , Zhaofei Liu , Chang Lu , Giovanni Martinelli , Galip Yuce , Jianguo Du","doi":"10.1016/j.gloplacha.2025.104778","DOIUrl":"10.1016/j.gloplacha.2025.104778","url":null,"abstract":"<div><div>A large quantity of CO<sub>2</sub> produced in the Earth's interior is emitted to the atmosphere via soil diffusion, especially in active tectonic areas. Due to the lack of extensive in situ measurements, however, estimations of soil CO<sub>2</sub> output have been poorly constrained thus far, leading to the perception that soil CO<sub>2</sub> seems to be a marginal source of global carbon emissions. Here, the contribution of soil CO<sub>2</sub> to the atmosphere is discussed based on soil degassing rates measured at 187 sites in the Tangshan seismic area, North China. The measured degassing rates ranged from 9.04 g m<sup>−2</sup>d<sup>−1</sup> to 230.42 g·m<sup>−2</sup>d<sup>−1</sup>, with an average of 87.46 g·m<sup>−2</sup>d<sup>−1</sup>, suggesting that high degassing rates are common throughout the region. Carbon isotopic results show that the soil CO<sub>2</sub> comes mainly from the deep-seated carbonates and shallow biogenetic processes. Using the threshold value of the data population (96.20 g·m<sup>−2</sup>d<sup>−1</sup>), the background and anomalous areas are distinguished. We find that anomalous degassing areas overlap well with epicenters of earthquakes with magnitudes greater than 5. The total annual CO<sub>2</sub> output in anomalous areas was estimated to be 38 Mt. This extremely high value can be attributed to the enlarged degassing areas and enhanced CO<sub>2</sub> emissions induced by regional active faults and frequent seismic activities. Our results indicate that the impact of soil CO<sub>2</sub> emissions in seismic regions should receive increased attention.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"249 ","pages":"Article 104778"},"PeriodicalIF":4.0,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143563238","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}

引用次数: 0

Analysis of estuarine marine heatwaves in an upwelling system: The Ría de Arousa as a case study 上升流系统中的河口海洋热浪分析：以Ría de arousal为例

IF 4 1区地球科学

Global and Planetary Change Pub Date : 2025-02-27 DOI: 10.1016/j.gloplacha.2025.104776

M. Des, A. Castro-Olivares, M. deCastro, M. Gómez-Gesteira

{"title":"Analysis of estuarine marine heatwaves in an upwelling system: The Ría de Arousa as a case study","authors":"M. Des, A. Castro-Olivares, M. deCastro, M. Gómez-Gesteira","doi":"10.1016/j.gloplacha.2025.104776","DOIUrl":"10.1016/j.gloplacha.2025.104776","url":null,"abstract":"<div><div>Marine heatwaves are prolonged periods of anomalously high water temperatures and have significant ecological and economic impacts. While these events are well-documented in open ocean systems, their characteristics and drivers in estuarine environments, particularly within upwelling systems, are less understood. This study analyzes estuarine marine heatwaves (EMHWs) in the Ría de Arousa, a productive estuary influenced by the upwelling dynamics of the NW Iberian Peninsula, using measured data from 2008 to 2023. Thirty-eight EMHW events were identified, with their occurrence strongly linked to oceanic thermal anomalies.</div><div>Among large-scale climate indexes, the Atlantic Multidecadal Oscillation (AMO) exhibited a significant positive correlation with EMHWs, explaining 13.8 % of their variability. In contrast, the East Atlantic (EA) and North Atlantic Oscillation (NAO) indexes showed no significant relationship. MHWs and extreme temperature events (METDs) at the continental shelf and open ocean were the strongest predictors of EMHWs. In contrast, atmospheric heatwaves (AHWs) have a minor influence.</div><div>The upwelling index exhibited a weak negative correlation, explaining only 0.17 % of EMHW variability, while wind intensity accounted for 0.32 %, suggesting a limited buffering effect of upwelling on EMHWs. A marked seasonal pattern was observed, with EMHWs being more intense in October than in summer, likely due to reduced upwelling activity in autumn. While upwelling may exert a mild regulatory effect, its capacity to mitigate extreme events appears limited. Understanding these interactions is crucial for improving predictive models and managing the impacts of EMHWs in ecologically and economically significant estuarine environments.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"249 ","pages":"Article 104776"},"PeriodicalIF":4.0,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548798","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}

引用次数: 0

Super paleo-typhoons striking southern Hainan Island in the northern South China Sea during the mid-late Holocene: Coral boulder evidence from a fringing reef 全新世中晚期袭击南海北部海南岛南部的超级古台风：来自边缘礁的珊瑚巨石证据

IF 4 1区地球科学

Global and Planetary Change Pub Date : 2025-02-27 DOI: 10.1016/j.gloplacha.2025.104775

Shengnan Zhou , Qi Shi , Shichen Tao , Xiyang Zhang , Hongqiang Yan , Huiling Zhang , Zhiwei Hou , Wenlong Jing , Ji Yang

{"title":"Super paleo-typhoons striking southern Hainan Island in the northern South China Sea during the mid-late Holocene: Coral boulder evidence from a fringing reef","authors":"Shengnan Zhou , Qi Shi , Shichen Tao , Xiyang Zhang , Hongqiang Yan , Huiling Zhang , Zhiwei Hou , Wenlong Jing , Ji Yang","doi":"10.1016/j.gloplacha.2025.104775","DOIUrl":"10.1016/j.gloplacha.2025.104775","url":null,"abstract":"<div><div>Hainan Island, situated at the northern margin of the South China Sea, is highly vulnerable to typhoon impacts, particularly super typhoons, which have caused catastrophic damage. Despite their persistent threats, research on these extreme events remains limited. At the Xiaodonghai Fringing Reef (XFR) in southern Hainan Island, coral boulders (CBs) distributed across the reef flat are interpreted as typhoon-transported features, serving as proxies for reconstructing past typhoon activity. This study establishes the relationships between (1) typhoon landfall wind velocities and wave heights along the South China and East China coasts, and (2) the mass of CBs on the XFR reef flat and their inferred typhoon wave heights. Utilizing these relationships, nine CBs were identified as having been transported by super typhoons. Through field positioning, radiometric dating, and comparisons with modern typhoon records, we identify five distinct phases of super paleo-typhoon (SuperPTY) that struck southern Hainan Island during the mid-late Holocene: 6970–6310 cal. aBP, 5890–5840 cal. aBP, 2490–1890 cal. aBP, 1630–1600 cal. aBP, and 1490–1450 cal. aBP. Notably, no super typhoons impacts have been recorded in recent decades. These SuperPTY phases correlate with atmospheric-oceanic teleconnections driven by the El Niño-Southern Oscillation and the Pacific Decadal Oscillation, as well as regional sea level fluctuations—factors that may also influence future super typhoon activity around Hainan Island under global warming. Further investigations into high-resolution sedimentary archives are recommended to advance understanding of spatiotemporal patterns in super typhoon occurrence.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"248 ","pages":"Article 104775"},"PeriodicalIF":4.0,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143528292","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}

引用次数: 0

A link between the paleoenvironment and PETM via trace element proxies in Southwest Atlantic sediments 西南大西洋沉积物中微量元素代用物与古环境的联系

IF 4 1区地球科学

Global and Planetary Change Pub Date : 2025-02-25 DOI: 10.1016/j.gloplacha.2025.104774

Xiaowen Liu , Xiaole Sun , Weidong Sun , Yufei Hao , Jing Huang

{"title":"A link between the paleoenvironment and PETM via trace element proxies in Southwest Atlantic sediments","authors":"Xiaowen Liu , Xiaole Sun , Weidong Sun , Yufei Hao , Jing Huang","doi":"10.1016/j.gloplacha.2025.104774","DOIUrl":"10.1016/j.gloplacha.2025.104774","url":null,"abstract":"<div><div>To investigate paleo-ocean environmental variations during the Paleocene Eocene Thermal Maximum (PETM), we conducted a geochemical analysis of high-resolution sediment samples from ODP Site 1267 in the Southwest Atlantic. Our results suggest that volcanic materials may have been introduced into the ocean prior to the negative carbon isotope excursion (CIE), while terrestrial debris became the predominant input during the recovery phase of the CIE. Characteristic shifts in trace metal enrichment factors (e.g., Mn<sub>EF</sub>, Mo<sub>EF</sub>, Ni<sub>EF</sub>, Cu<sub>EF</sub>, Co<sub>EF</sub>) indicate a transient period of hypoxia in the bottom seawater of the Southwest Atlantic during the onset and development phase of the CIE, likely caused by the oxidation of methane released from the seafloor. Elevated levels of nutrient elements (e.g., Sr/Ca ratio, biogenic barium [Ba<sub>bio</sub>], and organic phosphorus [P<sub>org</sub>]) in sediments suggest a sustained increase in primary productivity during both the development and recovery phases of the CIE. This increase is likely linked to hypoxic and acidic conditions during the development phase of the CIE and the influx of terrestrial debris during the recovery phase of the CIE. Ocean hypoxia and acidification likely facilitated the release of phosphorus and barium from sediments, which were transported to surface seawater via upwelling, further stimulating primary productivity. Additionally, intensified continental weathering during the recovery phase of the CIE contributed to sustained growth in productivity. The high-resolution trace element analysis provides critical insights into the temporal and causal relationships among volcanic activity, ocean hypoxia, enhanced weathering, and increased productivity during PETM events.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"248 ","pages":"Article 104774"},"PeriodicalIF":4.0,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143512283","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}

引用次数: 0

Collapse of prehistoric cultures in central-eastern China linked to the El Niño-like states during the 4.2 ka event 中国中东部史前文化的崩溃与4.2 ka事件期间的El Niño-like状态有关

IF 4 1区地球科学

Global and Planetary Change Pub Date : 2025-02-24 DOI: 10.1016/j.gloplacha.2025.104772

Shiwei Jiang , Wuhong Luo , Xin Zhou , Zhi-Bo Li , Yong Luo , Anze Chen , Xuanqiao Liu , Hongfei Zhao , Guangcheng Zhang , Juzhong Zhang

{"title":"Collapse of prehistoric cultures in central-eastern China linked to the El Niño-like states during the 4.2 ka event","authors":"Shiwei Jiang , Wuhong Luo , Xin Zhou , Zhi-Bo Li , Yong Luo , Anze Chen , Xuanqiao Liu , Hongfei Zhao , Guangcheng Zhang , Juzhong Zhang","doi":"10.1016/j.gloplacha.2025.104772","DOIUrl":"10.1016/j.gloplacha.2025.104772","url":null,"abstract":"<div><div>The Huai River Basin, located in the transition zone between the Yangtze and Yellow River basins, plays a significant role in the integration and development of Neolithic cultures. Lack of precipitation reconstructions from the Huai River Basin limits our knowledge on patterns and mechanisms of precipitation in the East Asian monsoon (EAM) region during the 4.2 ka event, which also hinders our understanding of the relationship between Neolithic culture transitions and climate change. In this study, we report a pollen record from the Wufan profile in the upper Huai River Basin. Our record indicates a wetter climate condition during the 4.2 ka event, which is in contrast to the reconstructed dry conditions in northern China. We further integrated accurately dated precipitation records of the 4.2 ka event and found a significant “dry-wet-dry” precipitation pattern in the EAM region during this cooling period. Specifically, northern China was relatively dry, the Jianghuai region was relatively wet, and the southwestern region was relatively dry. This pattern was likely driven by El Niño-like conditions in the tropical Pacific. In addition, we discovered a close link between the collapse of Neolithic cultures and the increased precipitation in central-eastern China, which is likely dominated by the El Niño-like states in the tropical Pacific.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"248 ","pages":"Article 104772"},"PeriodicalIF":4.0,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143526816","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}

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