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Projecting precipitation-driven vegetation changes on the Tibetan Plateau using in-situ station data
IF 4 1区 地球科学
Global and Planetary Change Pub Date : 2025-08-11 DOI: 10.1016/j.gloplacha.2025.105018
Zhiping Zhao , Joshua Talib , Emma J. Barton , Chris Huntingford
{"title":"Projecting precipitation-driven vegetation changes on the Tibetan Plateau using in-situ station data","authors":"Zhiping Zhao ,&nbsp;Joshua Talib ,&nbsp;Emma J. Barton ,&nbsp;Chris Huntingford","doi":"10.1016/j.gloplacha.2025.105018","DOIUrl":"10.1016/j.gloplacha.2025.105018","url":null,"abstract":"<div><div>Vegetation on the Tibetan Plateau (TP) plays a crucial role in continental energy, water and carbon budgets. Throughout the rest of the 21st century, TP vegetation faces two key pressures: First, the impact of climate change-induced atmospheric changes; and second, potential shifts imposed by direct land use. In this study we characterize rainfall-driven local vegetation changes through combining in situ station data and satellite observations. We then project future vegetation changes using simulated precipitation characteristics from the latest state-of-the-art Earth System Models (ESMs).</div><div>We find that 61 out of 90 stations have a significant precipitation-vegetation relationship compared to only 29 stations with a significant temperature-vegetation relationship. Therefore, to project future vegetation changes, we focus on local partial correlations between interannual variations of precipitation and satellite retrievals of the Normalized Difference Vegetation Index (NDVI). Most sites with significant partial correlations are characterized by short vegetation conditions (94 %). Significant stations are also associated with low climatological precipitation and dry surface conditions. We study connections between simultaneous interannual variations of NDVI and precipitation, as temporal trends of these variables are insufficient given the short time span of observations (20 years). At most short vegetation sites, precipitation increases NDVI. For example, at Madou, a well-established grassland site, NDVI increases by 0.05 (approximately 18 %) with an annual accumulation rainfall increase of 100 mm, which is within the limits of interannual precipitation variations at this site.</div><div>We take our site-specific partial correlations, where statistically significant, and merge them with projections of future rainfall to estimate NDVI throughout the rest of the century. Across the TP, we estimate typical NDVI increases of 10 %, when using the “business-as-usual” scenario to force ESMs. However, uncertainties in estimated NDVI occur due to substantial variations in projected precipitation by ESMs and site-specific attributes. Our analysis encourages constraining future precipitation projections by ESMs, developing land models specific to the TP, and increasing the duration and number of in situ observational sites.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 105018"},"PeriodicalIF":4.0,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144885667","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
Editorial preface to special issue: Temporal and spatial patterns in Holocene floods under the influence of past global change, and their implications for forecasting “unpredecented” future events 特刊社论前言:过去全球变化影响下全新世洪水的时空格局及其对预测“史无前例”未来事件的影响
IF 4 1区 地球科学
Global and Planetary Change Pub Date : 2025-08-11 DOI: 10.1016/j.gloplacha.2025.105021
Lothar Schulte , Juan I. Santisteban , Ian C. Fuller , Juan Antonio Ballesteros-Cánovas
{"title":"Editorial preface to special issue: Temporal and spatial patterns in Holocene floods under the influence of past global change, and their implications for forecasting “unpredecented” future events","authors":"Lothar Schulte ,&nbsp;Juan I. Santisteban ,&nbsp;Ian C. Fuller ,&nbsp;Juan Antonio Ballesteros-Cánovas","doi":"10.1016/j.gloplacha.2025.105021","DOIUrl":"10.1016/j.gloplacha.2025.105021","url":null,"abstract":"<div><div>Floods constitute the most significant natural hazard to societies worldwide. Population growth and unchecked development have led to floodplain encroachment. Modelling suggests that climate change will regionally intensify the threat posed by future floods, with more people in harm's way. From a global change perspective, past flood events and their spatial-temporal patterns are of particular interest because they can be linked to former climate patterns, which can be used to guide future climate predictions. Millennial and centennial time series contain evidence of very rare extreme events, which are often considered by society as ‘unprecedented’. By understanding their timing, magnitude and frequency in conjunction with prevailing climate regime, we can better forecast their future occurrence.</div><div>This Virtual Special Issue (VSI) entitled <em>Temporal and spatial patterns in Holocene floods under the influence of past global change, and their implications for forecasting “unpredecented” future events</em> comprises 14 papers that focus on how centennial and millennia-scale natural and documentary flood archives help improve future flood science. Specifically, documentation of large and very rare flood episodes challenges society's lack of imagination regarding the scale of flood disasters that are possible (what we term here, the “unknown unknowns”). Temporal and spatial flood behaviour and related climate patterns as well as the reconstruction of flood propagation in river systems are important foci of this VSI. These reconstructions are crucial for the provision of robust and reliable data sets, knowledge and baseline information for future flood scenarios and forecasting. We argue that it remains difficult to establish analogies for understanding flood risk during the current period of global warming. Most studies in this VSI suggest that the most severe flooding occurred during relatively cool climate periods, such as the Little Ice Age. However, flood patterns have been significantly altered by land use and river management in many catchments and floodplains over the last two centuries, thereby obscuring the climate signal. When the largest floods in instrumental records are compared with paleoflood records reconstructed from natural and documentary archives, it becomes clear that precedent floods should have been considered in many cases of flood frequency analysis and flood risk modelling in hydraulic infrastructure. Finally, numerical geomorphological analysis and hydrological simulations show great potential for testing and improving our understanding of the processes and factors involved in the temporal and spatial behaviour of floods.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 105021"},"PeriodicalIF":4.0,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144892144","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
High-latitude continental evidence of the Jenkyns Event: Insights from the Southern Junggar Basin, NW China 詹金斯事件的高纬度大陆证据:来自南准噶尔盆地的启示
IF 4 1区 地球科学
Global and Planetary Change Pub Date : 2025-08-10 DOI: 10.1016/j.gloplacha.2025.105007
Zhihui Zhang , Yuanchen Guo , Dawei Lv , Man Lu , Tiantian Wang , Luojing Wang , Guibo Zheng , Yuting Zhang , Bing Wang , Guoqiang Duan
{"title":"High-latitude continental evidence of the Jenkyns Event: Insights from the Southern Junggar Basin, NW China","authors":"Zhihui Zhang ,&nbsp;Yuanchen Guo ,&nbsp;Dawei Lv ,&nbsp;Man Lu ,&nbsp;Tiantian Wang ,&nbsp;Luojing Wang ,&nbsp;Guibo Zheng ,&nbsp;Yuting Zhang ,&nbsp;Bing Wang ,&nbsp;Guoqiang Duan","doi":"10.1016/j.gloplacha.2025.105007","DOIUrl":"10.1016/j.gloplacha.2025.105007","url":null,"abstract":"<div><div>The Jenkyns Event (Toarcian Oceanic Anoxic Event, T-OAE) represents a period of extreme global warming during the Early Jurassic. This study integrated geochronological, palynological, and elemental geochemical analyses on the Lower Jurassic Sangonghe Formation, a high-latitude lacustrine sequence exposed in the Honggou Section of the Junggar Basin. The results reveal a negative organic excursion in carbon isotopes, accompanied by significant enrichment in total organic carbon (TOC) within the Sangonghe mudstone. Combined with. Zircon U<img>Pb dating and age-diagnostic palynological assemblages, these findings suggest a probable correlation with the Jenkyns Event documented in both marine and terrestrial sediments. We reconstructed the climatic changes and environmental responses of the Junggar basin during the event. Elevated values of paleoclimatic proxies, including the C value and ln (Al<sub>2</sub>O<sub>3</sub>/Na<sub>2</sub>O), along with an increased proportion of drought-tolerant palynomorph taxa, indicate an inland aridification occurring alongside intermittent humidity. Concurrent declines in the clastic input proxy (Ti/Al) and increases paleoproductivity proxy (Zn/Ti) suggest lake deepening and enhanced primary productivity, potentially resulting in water-column anoxia. This interpretation is supported by positive shifts in redox-sensitive indicators, including Mo<sub>EF</sub>, U<sub>EF</sub>, and C<sub>org</sub>/P. Positive correlations between TOC and indicators of primary productivity and redox conditions suggest that increased primary productivity and development of anoxia jointly facilitated substantial organic carbon accumulation in high-latitude lake, making it a sink of organic carbon during the extreme thermal event. These findings provide a terrestrial evidence from high-latitude settings of climatic and environmental responses to the Jenkyns Event and offer new insights into its global significance.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 105007"},"PeriodicalIF":4.0,"publicationDate":"2025-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144841535","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
East-west divergence in Holocene organic carbon accumulation of Tibetan Plateau lakes: Roles of climate and organic matter sources 青藏高原湖泊全新世有机碳聚集的东西分异:气候和有机质来源的作用
IF 4 1区 地球科学
Global and Planetary Change Pub Date : 2025-08-10 DOI: 10.1016/j.gloplacha.2025.105014
Tonggang Zang , Xiaohuan Hou , Zhe Sun , Xiaoxue Gao , Kejia Ji , Juzhi Hou
{"title":"East-west divergence in Holocene organic carbon accumulation of Tibetan Plateau lakes: Roles of climate and organic matter sources","authors":"Tonggang Zang ,&nbsp;Xiaohuan Hou ,&nbsp;Zhe Sun ,&nbsp;Xiaoxue Gao ,&nbsp;Kejia Ji ,&nbsp;Juzhi Hou","doi":"10.1016/j.gloplacha.2025.105014","DOIUrl":"10.1016/j.gloplacha.2025.105014","url":null,"abstract":"<div><div>With the increasing prominence of carbon emissions and the intensification of global warming, the carbon cycle and carbon accumulation have drawn widespread attention. Lake carbon accumulation is a crucial component of the terrestrial carbon cycle, significantly influencing local climate change and atmospheric carbon dioxide levels. The Tibetan Plateau (TP), renowned for its high elevation, numerous alpine lakes, and large carbon storage in sediments, is a key area for studying lake organic carbon accumulation. However, the carbon accumulation rate (CAR) of lakes on the TP exhibits strong spatial variability, and the driving mechanisms vary across regions, especially in the western TP, which has been poorly studied. To understand the driving mechanisms of climate and human activities on lake CAR across the TP, we collected 33 sediment cores, including 15 from the western TP, and calculated the CAR during the Holocene. Our results show that the average CAR of lakes on the TP during the Holocene was 6.13 g C m<sup>−2</sup> yr<sup>−1</sup>. Through relational cluster analysis, lakes were classified into two groups, with an east - west distribution pattern separated by the 90°E meridian. In eastern lakes, CAR is closely related to temperature and precipitation, while in western lakes, it is mainly influenced by wind strength. This difference is attributed to the distinct sources of organic matter in lake sediments. In eastern lakes, total organic carbon (TOC) comes from both aquatic and terrestrial plants. Higher temperatures and more precipitation promote terrestrial vegetation growth in the watershed, increasing sediment TOC content and accelerating sediment accumulation rate (SAR). In contrast, in western lakes with lower temperatures and less precipitation, TOC mainly originates from aquatic plants. Thus, temperature and precipitation changes have a minor impact on TOC, and lake sedimentation is mainly affected by wind dynamics, resulting in a negative correlation between precipitation and CAR. Additionally, the CAR of all lakes on the TP is negatively correlated with lake area and depth. Under continued warming, the CAR of eastern TP lakes is likely to increase, with small and shallow lakes playing a significant role.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 105014"},"PeriodicalIF":4.0,"publicationDate":"2025-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144828659","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 strong influence of the precession and northern high latitudinal climate on the monsoon seasonality and productivity in the Andaman Sea 岁差和北部高纬气候对安达曼海季风季节和生产力的强烈影响
IF 4 1区 地球科学
Global and Planetary Change Pub Date : 2025-08-09 DOI: 10.1016/j.gloplacha.2025.105017
Rinu Fathima , Rajeev Saraswat , Sudhira R. Bhadra , Dinesh Kumar Naik , Thejasino Suokhrie
{"title":"A strong influence of the precession and northern high latitudinal climate on the monsoon seasonality and productivity in the Andaman Sea","authors":"Rinu Fathima ,&nbsp;Rajeev Saraswat ,&nbsp;Sudhira R. Bhadra ,&nbsp;Dinesh Kumar Naik ,&nbsp;Thejasino Suokhrie","doi":"10.1016/j.gloplacha.2025.105017","DOIUrl":"10.1016/j.gloplacha.2025.105017","url":null,"abstract":"<div><div>The Indian Monsoon (IM) is a vital component of the global climate system, driving seasonal changes in precipitation, productivity, and circulation in the Indian Ocean. However, despite its significance in affecting the socio-economic conditions of over a billion people living in South Asia, the factors influencing the spatio-temporal variability of IM remain uncertain. The Andaman Sea, a core monsoon region, is a unique and relatively under-sampled basin with limited connectivity to the global ocean. To better understand the stadial-interstadial variability in IM seasonality and associated productivity, we studied the relative abundance of planktic foraminifera from the International Ocean Discovery Program (IODP) Expedition 353 Site U1448 in the Andaman Sea. Our findings reveal a strong stadial-interstadial variability in the monsoon seasonality, with a stronger Indian Summer monsoon (ISM) during the interstadials and a stronger Indian Winter monsoon (IWM) during the stadials. Specifically, the strongest ISM was during the early Holocene, associated with higher insolation, while peak IWM intensity was during the Heinrich Event 1 (H1). Moreover, we observed a strong influence of the high latitudinal millennial scale North Atlantic cold and warm events, such as Younger Dryas (YD), Heinrich Event (H1−10), and Bolling-Allerod (B/A), on the Andaman Sea, with warm events typically leading to stronger ISM and cold events leading to stronger IWM. We also report a strong coupling between ISM and productivity, with stronger ISM associated with higher productivity. A distinct stadial-interstadial variability was observed in the magnetic susceptibility (MS) and Red/Blue (R/B) reflectance ratio which were used to understand the calcium carbonate (CaCO<sub>3</sub>) and organic carbon (C<sub>org</sub>) content variability. The higher CaCO<sub>3</sub> and C<sub>org</sub> values were observed during the interstadials and lower values during the stadials. Both, ISM and IWM exhibited a significant periodicity of 24 and 21 kyr, respectively and the summer monsoon was in phase with maximum northern hemisphere solar insolation in the precession band with a minor lag of 2.4 kyr, suggesting the dominant role of precession in controlling the monsoon in the Andaman region. This study suggests a precession modulated insolation variability as the major factor controlling IM variability, along with which, internal feedbacks including the glacial boundary conditions, northern hemisphere climate and greenhouse gas concentration also influenced the IM during the last glacial-interglacial cycle. These findings provide crucial insights into the factors affecting IM variability and will aid in improving our understanding of the climate system's complex dynamics.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 105017"},"PeriodicalIF":4.0,"publicationDate":"2025-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144864919","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
Variations of Zn isotopes in phosphorites and their implications 磷岩中锌同位素的变化及其意义
IF 4 1区 地球科学
Global and Planetary Change Pub Date : 2025-08-08 DOI: 10.1016/j.gloplacha.2025.105016
Danish Khan , Haifeng Fan , Hongjie Zhang , Fang Zhang , Eric E. Hiatt , James R. Hein , Ting Zhou , Hanjie Wen
{"title":"Variations of Zn isotopes in phosphorites and their implications","authors":"Danish Khan ,&nbsp;Haifeng Fan ,&nbsp;Hongjie Zhang ,&nbsp;Fang Zhang ,&nbsp;Eric E. Hiatt ,&nbsp;James R. Hein ,&nbsp;Ting Zhou ,&nbsp;Hanjie Wen","doi":"10.1016/j.gloplacha.2025.105016","DOIUrl":"10.1016/j.gloplacha.2025.105016","url":null,"abstract":"<div><div>Variations of Zn isotopes in phosphorites can play an important role in elucidating the primary productivity and temporal dynamics of the marine environment. However, the controlling factors associated with Zn isotope fractionation in phosphorite deposits are not well documented, which limits the utility of Zn isotope as a proxy to study modern and paleo-ocean productivity. In this research, several geochemical proxies derived from trace elements are used to monitor the effect of various parameters on the evolution of δ<sup>66</sup>Zn in Cenozoic and Permian phosphorite deposits in detail. Lower δ<sup>66</sup>Zn values in phosphorites indicate reduced productivity, while higher δ<sup>66</sup>Zn values suggest increased productivity, although this relationship may be influenced by other moderating factors. The study finds that the Peru Margin (Cenozoic) and Retort Member (Permian) phosphorites exhibit lower δ<sup>66</sup>Zn values, acting as sinks for lighter δ<sup>66</sup>Zn. In contrast, phosphorites from the Blake Plateau align with modern deep ocean δ<sup>66</sup>Zn values, while those from the California Borderland, Chatham Rise, and open-ocean seamounts (Cenozoic) and Meade Peak Member (Permian) show higher δ<sup>66</sup>Zn values, serving as sinks for heavier δ<sup>66</sup>Zn isotopes. These variations of Zn isotopes in phosphorites could be controlled by productivity and redox conditions. Based on our dataset, we suggest that in addition to organic-rich shales, Fe<img>Mn oxides, and carbonates, phosphorites may also represent another potential important sink for both lighter and heavier Zn isotopes.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 105016"},"PeriodicalIF":4.0,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144830643","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
Changes in continental weathering across the Permian-Triassic transition: A global review 二叠纪-三叠纪大陆风化变化的全球回顾
IF 4 1区 地球科学
Global and Planetary Change Pub Date : 2025-08-08 DOI: 10.1016/j.gloplacha.2025.105015
Joseph Mayala Nsingi , Ying Cui , Emily Cepin , Brian Beaty , Noah Planavsky , Qingting Wu , Markus Adloff , Jiuyuan Wang , David Selby , Zeyang Liu , Yixin Dong , Shijun Jiang , Feng Zhu
{"title":"Changes in continental weathering across the Permian-Triassic transition: A global review","authors":"Joseph Mayala Nsingi ,&nbsp;Ying Cui ,&nbsp;Emily Cepin ,&nbsp;Brian Beaty ,&nbsp;Noah Planavsky ,&nbsp;Qingting Wu ,&nbsp;Markus Adloff ,&nbsp;Jiuyuan Wang ,&nbsp;David Selby ,&nbsp;Zeyang Liu ,&nbsp;Yixin Dong ,&nbsp;Shijun Jiang ,&nbsp;Feng Zhu","doi":"10.1016/j.gloplacha.2025.105015","DOIUrl":"10.1016/j.gloplacha.2025.105015","url":null,"abstract":"<div><div>The end-Permian mass extinction (EPME) is associated with the loss of approximately 80–90 % marine species and 70 % terrestrial taxa. Massive greenhouse gas emissions from activities of the Siberian Traps Large Igneous Province (ST-LIP) and arc volcanisms are thought to be the trigger of the EPME. Global temperatures rose significantly following the EPME, and such extreme warmth persisted into the Early Triassic, which may have led to enhanced silicate weathering, and increased river runoff and sediment accumulation rate. However, ecosystem recovery was delayed by at least five million years after the EPME. One leading hypothesis attributes this protracted recovery to sustained atmospheric CO₂ accumulation, resulting from volcanic emissions from the ST-LIP that overwhelmed the normal Earth surface carbon cycle. To evaluate this, we synthesize geochemical and sedimentological records of continental weathering across the Permian–Triassic (PT) transition, drawing on a suite of proxies including major elements-based proxies, strontium (<sup>87/86</sup>Sr and δ<sup>88/86</sup>Sr), osmium (<sup>187</sup>Os/<sup>188</sup>Os), lithium (δ<sup>7</sup>Li), magnesium (δ<sup>26</sup>Mg) and calcium (δ<sup>44</sup>Ca) isotopes. We highlight the strengths and limitations of each proxy and assess how chemical and physical weathering may have responded to the environmental perturbations across the PT transition. Collectively, these records can help test the hypothesis that the silicate weathering feedback were insufficient to counteract elevated CO<sub>2</sub> levels, thereby failing to stabilize Earth's climate during the prolonged Early Triassic warmth.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 105015"},"PeriodicalIF":4.0,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144864918","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
Chinese speleothem evidence of the early-mid Holocene transition and the instability of Asian summer monsoon 全新世早中期转变与亚洲夏季风不稳定的中国洞穴证据
IF 4 1区 地球科学
Global and Planetary Change Pub Date : 2025-08-07 DOI: 10.1016/j.gloplacha.2025.105010
Bin Zhao , Yongjin Wang , Kan Zhao , Jianjun Yin , Quan Wang , Shaohua Yang , Qingfeng Shao , Hai Cheng , Yijia Liang
{"title":"Chinese speleothem evidence of the early-mid Holocene transition and the instability of Asian summer monsoon","authors":"Bin Zhao ,&nbsp;Yongjin Wang ,&nbsp;Kan Zhao ,&nbsp;Jianjun Yin ,&nbsp;Quan Wang ,&nbsp;Shaohua Yang ,&nbsp;Qingfeng Shao ,&nbsp;Hai Cheng ,&nbsp;Yijia Liang","doi":"10.1016/j.gloplacha.2025.105010","DOIUrl":"10.1016/j.gloplacha.2025.105010","url":null,"abstract":"<div><div>The Asian summer monsoon circulation during the Holocene is suggested to be controlled by northern hemisphere summer insolation, but the transition from strong to weak monsoon status lagged the insolation peak, and its causes remain unclear. Here, we provide a high-resolution East Asian summer monsoon record, with 14 <sup>230</sup>Th/U dates and 510 δ<sup>18</sup>O data on a stalagmite from Shima Cave, central China, spanning the past 14.6 ka. Our record shows a gradual monsoon intensification from the deglaciation to the early Holocene, followed by monsoon deterioration since the mid Holocene. Using 23 cave δ<sup>18</sup>O records from China, we obtained an integrated δ<sup>18</sup>O record in order to investigate the overall changes in Asian summer monsoon circulation throughout the Holocene. The general pattern and transition of the integrated δ<sup>18</sup>O record agree well with the Ti record from Cariaco Basin, both demonstrating a prominent transition at ∼7.5 ka BP and coinciding with worldwide reorganizations of atmospheric circulations. The early-mid Holocene monsoon transition demonstrates that the response of the monsoon to insolation is likely altered by internal changes, including temperature in northern hemisphere and ice-sheet recession. Besides, fluctuating monsoon climate during the early Holocene is well demonstrated in Shima record. Prominent and large-amplitude monsoon weakenings during the 8.2 ka, 9.2 ka and Preboreal Oscillation events, and five small-amplitude events, all related to meltwater injections and cooling in the North Atlantic regions. The close correspondence between these reconstructions suggests that the early Holocene monsoonal changes were sensitive to northern high-latitude climates during the process of ice sheet retreat.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 105010"},"PeriodicalIF":4.0,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144827328","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
Slab tearing controlling divergent volatile fluxes at convergent plate boundaries, southern Tibetan Plateau
IF 4 1区 地球科学
Global and Planetary Change Pub Date : 2025-08-07 DOI: 10.1016/j.gloplacha.2025.105011
Sanyu Quan , Yingchun Wang , Shuang Liao , Yi Wang , Yinlei Hao , Jiao Tian , Zhongping Li , Chunhui Cao , Hikaru Iwamori
{"title":"Slab tearing controlling divergent volatile fluxes at convergent plate boundaries, southern Tibetan Plateau","authors":"Sanyu Quan ,&nbsp;Yingchun Wang ,&nbsp;Shuang Liao ,&nbsp;Yi Wang ,&nbsp;Yinlei Hao ,&nbsp;Jiao Tian ,&nbsp;Zhongping Li ,&nbsp;Chunhui Cao ,&nbsp;Hikaru Iwamori","doi":"10.1016/j.gloplacha.2025.105011","DOIUrl":"10.1016/j.gloplacha.2025.105011","url":null,"abstract":"<div><div>The morphology and characteristics of subducting slabs play a critical role in controlling the formation and release of volatiles at plate boundaries. However, this control mechanism remains unclear in orogenic belts, such as the Tibetan Plateau. This study compiles helium and carbon data from 116 hot springs (132 samples) across three rift systems in southern Tibet—Pumqu-Xianza Rift, Yadong-Gulu Rift, and Cuona-Woka Rift—and employs a revised helium‑carbon coupling model, along with Monte Carlo simulation. The results reveal a transitional zone between the previously defined helium boundary (“mantle suture”) and newly identified carbon boundary (“tear boundary”), indicating a 200-km-wide transitional zone between the pre-established helium boundary and the newly identified carbon boundary, showing northward displacement of the carbon boundary relative to the helium boundary. Calculated <sup>3</sup>He fluxes demonstrate spatial variations: 8.8 × 10<sup>3</sup> atoms/m<sup>2</sup>/s south of the helium boundary, 3.3 × 10<sup>4</sup> atoms/m<sup>2</sup>/s within the transitional zone, and 2.1 × 10<sup>5</sup> atoms/m<sup>2</sup>/s north of the carbon boundary. Slab tearing appears to between YGR and PXR (∼89°E), resulting in significant differences in mantle volatile distribution. The mantle carbon is &lt;1 % south of the helium boundary, ranges from 1 % and 2 % in the transition zone, while higher than 2 % north of the carbon boundary (with a mean of 4.6 %). V-type slab tearing west of YGR facilitates asthenospheric upwelling under ongoing north-south compression, generating E-W crustal extension that ultimately forms the rift system. These findings highlight the critical impact of slab tearing on the mantle-crust interactions, the regulation of volatile migration, and the geodynamic processes influencing habitability in the collision zone.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 105011"},"PeriodicalIF":4.0,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144865042","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
Preface to the special issue: Western Pacific biogeochemical cycles across the air-sea and sediment-water interfaces and their response to global changes 特刊前言:西太平洋大气-海洋和沉积物-水界面的生物地球化学循环及其对全球变化的响应
IF 4 1区 地球科学
Global and Planetary Change Pub Date : 2025-08-07 DOI: 10.1016/j.gloplacha.2025.105013
Tianyu Chen , Zhimian Cao , Joseph Stewart , Xianhui Wan
{"title":"Preface to the special issue: Western Pacific biogeochemical cycles across the air-sea and sediment-water interfaces and their response to global changes","authors":"Tianyu Chen ,&nbsp;Zhimian Cao ,&nbsp;Joseph Stewart ,&nbsp;Xianhui Wan","doi":"10.1016/j.gloplacha.2025.105013","DOIUrl":"10.1016/j.gloplacha.2025.105013","url":null,"abstract":"<div><div>The Western Pacific is a unique region for studying cross-interface biogeochemical cycling, which is influenced by the boundary currents and their interactions with the East Asian marginal seas. This special issue expands our knowledge of the Western Pacific biogeochemical cycles across the air–sea and sediment–water interfaces, and their links with global climate change. It contains 27 research articles addressing 3 primary themes: (i) air–sea interface processes (e.g., biological pump, gas exchange, dust fluxes), (ii) sediment–water interface processes (e.g., organic matter diagenesis, hydrothermal flux, metal isotope geochemistry), and (iii) paleoceanographic records documenting past Western Pacific productivity, carbon cycle and water mass mixing. Together, these contributions advance our understanding of how the Western Pacific Ocean participates in global biogeochemical and climate systems, both in the present and geological past.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"254 ","pages":"Article 105013"},"PeriodicalIF":4.0,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144897863","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
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