Global and Planetary Change最新文献

{"title":"Low oxygen levels and fluctuated redox states of continental shelf seawater after the Cambrian explosion","authors":"Weijie Ke ,&nbsp;Guang-Yi Wei ,&nbsp;Yi-Sheng Yin ,&nbsp;Zhihang Yu ,&nbsp;Tianchen He ,&nbsp;Maoyan Zhu ,&nbsp;Hong-Fei Ling","doi":"10.1016/j.gloplacha.2024.104596","DOIUrl":"10.1016/j.gloplacha.2024.104596","url":null,"abstract":"<div><div>The Cambrian Miaolingian and Furongian (509–485 Ma) represent a critical transitional interval in evolutionary history of animals, bridging the Cambrian explosion to Great Ordovician Biodiversification Event (GOBE). Despite its significance, scant attention has been directed toward understanding the shifts in marine redox conditions and biogeochemical cycles during this epoch, hampering the broader understanding of linkages between marine environment and early animal radiation. Here we present new paired sulfur isotope records from carbonate-associated sulfate (δ³⁴S_CAS) and pyrite (δ³⁴S_py), along with nitrogen isotopes (δ¹⁵N_decarb) from a continuous carbonate succession in South China, aiming to better constrain marine redox states and biogeochemical cycles during the middle-late Cambrian (ca. 509–495 Ma). Overall low sulfur isotope offsets Δ³⁴S_CAS-py (Δ³⁴S_CAS-py = δ³⁴S_CAS-δ³⁴S_py, 1.1–46.6‰，median = 21.0‰) indicate continuously low seawater sulfate concentrations during middle-late Cambrian. The consistently low δ¹⁵N_decarb values (−1.4–2.3‰，median = 0.4‰) suggest that this period was featured by active nitrogen fixation and a small nitrate reservoir in the shallow ocean. Taken together, the sulfur and nitrogen isotopic data can be best explained by persistently low global oxygenation levels of the middle-late Cambrian oceans. Meanwhile, high variabilities of Δ³⁴S_CAS-py and δ¹⁵N_decarb recorded by the studied section also suggest fluctuated marine redox conditions on continental margins during this period. In combination with paleontological records, we propose that persistently low marine oxygenation levels and frequent expansion of anoxic seawater on continental margins may have induced a trough period in animal biodiversification after the Cambrian explosion.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"242 ","pages":"Article 104596"},"PeriodicalIF":4.0,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142357230","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}

{"title":"40Ar/39Ar geochronologic and paleoenvironmental constraints to glacial termination III and MIS 7e, 7c, and 7a sea level fluctuations on the Tyrrhenian Sea coast of Italy","authors":"F. Bulian ,&nbsp;F. Marra ,&nbsp;L. Monaco ,&nbsp;D.M. Palladino ,&nbsp;D. Scarponi ,&nbsp;J. Sevink ,&nbsp;P. Vannoli ,&nbsp;M. Cervellieri ,&nbsp;B.R. Jicha ,&nbsp;I. Mazzini ,&nbsp;S. Nomade ,&nbsp;A. Pereira ,&nbsp;A. Sposato","doi":"10.1016/j.gloplacha.2024.104594","DOIUrl":"10.1016/j.gloplacha.2024.104594","url":null,"abstract":"<div><div>We provide detailed sedimentological, paleontological, and tephrochronological data on a complex sedimentary succession cropping out in the Tyrrhenian coastal area of central Italy, which was deposited in response to sea-level rise during MIS 7, coeval with the Latera phase of activity in the Vulsini Volcanic District. Diffuse intercalations of primary volcanic layers erupted during this phase and their geochronologic and chemostratigraphical characterization based on ⁴⁰Ar/³⁹Ar dating and EMP analyses, allowed for the identification of three stacked aggradational successions separated by erosive phases and their correlation with the Oxygen isotope record and phases in the relative sea-level curve. The ages of the tephra layers strictly frame the sedimentation in the interval of 253–206 ka, providing independent dating to glacial Termination III and to the three sea-level oscillations during MIS 7e, 7c, and 7a.</div><div>Moreover, micro- and macrofaunal-based analyses provide information on the paleoenvironments and bathymetry during the highstands, which complement the geomorphological analysis reconstructing the inner edges of the corresponding marine terraces, allowing us to assess precise maximum sea level reached during MIS 7e and MIS 7a.</div><div>The results of this multidisciplinary study enable us to establish in great detail the chronology, dynamics, relative amplitude, and effects of the sea-level fluctuations in the Tyrrhenian Sea during the whole MIS 7, providing independent, precise geochronological constraints for this period.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"242 ","pages":"Article 104594"},"PeriodicalIF":4.0,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424628","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}

{"title":"Impact of millennial-scale fluctuations of the Siberian High on Holocene aeolian activity: Insights from Lake Ailike in arid Central Asia","authors":"Yaru Chen ,&nbsp;Xingqi Liu ,&nbsp;Junfeng Li ,&nbsp;Xiangjun Liu ,&nbsp;Xianjiao Ou","doi":"10.1016/j.gloplacha.2024.104593","DOIUrl":"10.1016/j.gloplacha.2024.104593","url":null,"abstract":"<div><div>Arid Central Asia (ACA) is a major dust source region in the Northern Hemisphere, owing to the prevalence of aeolian activity that substantially impacts the ecological environment and human wellbeing in this region. However, the driving mechanisms of aeolian activity in ACA during the Holocene are unclear, making it difficult to predict possible future aeolian activity. We used AMS ¹⁴C dating, combined with grain-size analysis, high-resolution X-ray fluorescence scanning, and scanning electron microscopy of a sediment core from Lake Ailike, in the Junggar Basin, to reconstruct the history of aeolian activity in ACA during the Holocene. We found that periods of increased aeolian activity on the millennial-scale are correlated with the strengthening of the Siberian High, and that there is a consistency between aeolian activity and climatic fluctuations in the mid-latitudes of Europe. These findings support a close relationship between climate fluctuations in mid- and high-latitude regions of the Northern Hemisphere. Lower/higher temperatures in high latitudes result in the expansion/contraction of polar air masses, leading to the strengthening/weakening of the Siberian High. Additionally, more/less frequent aeolian activity in ACA corresponded to cooling/warming trends in the mid-latitudes of Europe during the Holocene. While ongoing global warming may lead to a long-term decrease in aeolian activity in ACA, the weakening of the polar vortex has resulted in more frequent cold waves affecting the mid-latitudes of Eurasia during winter in recent years.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"242 ","pages":"Article 104593"},"PeriodicalIF":4.0,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142357232","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}

{"title":"The Central Paratethys Sea – Part of the tropical eastern Atlantic rather than gate into the Indian Ocean","authors":"Mathias Harzhauser ,&nbsp;Bernard Landau ,&nbsp;Oleg Mandic ,&nbsp;Thomas A. Neubauer","doi":"10.1016/j.gloplacha.2024.104595","DOIUrl":"10.1016/j.gloplacha.2024.104595","url":null,"abstract":"<div><div>The Miocene Paratethys Sea is frequently depicted as junction between the Proto-Mediterranean Sea and the Indian Ocean. Herein, we elucidate the biogeographic character of this large epicontinental Miocene sea based on its speciose gastropod fauna. We debunk the persistent myth that there was a connection between these marine realms during Langhian times via the Tethys Seaway. Throughout most of the Early and Middle Miocene the connectivity of the Central Paratethys was via the Rhône Strait and the Slovenian Strait as supported by up to ∼22 % of species shared with the Proto-Mediterranean Sea. The faunistic similarity decreased successively at higher latitudes towards the northeastern Atlantic and dropped to low values towards the North Sea. Therefore, a connection with the North Sea can be excluded throughout the Early and Middle Miocene. Faunistic relations of the Central Paratethys Sea with the Eastern Paratethys Sea were surprisingly low until the late Middle Miocene, when endemic species from the Eastern Paratethys ‘flooded’ the Central Paratethys. Therefore, the effectiveness in species transfer or presence of the Carasu and Barlad straits, hypothetically connecting both seas, must be questioned for most of the Middle Miocene.</div><div>The present-day gastropod faunas of the tropical eastern Atlantic (TEA) and the Indo-West Pacific Region (IWP) can be distinguished clearly by their differing faunal structure (different relative abundance of certain families). The faunas of the Paratethyan and the Proto-Mediterranean Sea follow more closely the type nowadays represented in the tropical eastern Atlantic, suggesting a common origin. The faunistic connectivity with the Indian Ocean, via the Tethys Seaway ceased very early during the Early Miocene, predating the formation of the <em>Gomphotherium</em> land bridge by several million years. Consequently, we reject a re-activation of the Tethys Seaway during the Langhian as providing an effective oceanographic gateway. This is an important observation for climate models, linking the closure of the Tethys Seaway to Miocene climate change.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"243 ","pages":"Article 104595"},"PeriodicalIF":4.0,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142528507","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}

{"title":"Lake sediment record of eolian activity on the eastern Tibetan Plateau since 15 cal ka BP","authors":"Xiaohuan Hou ,&nbsp;Zhe Sun ,&nbsp;Shengqian Chen ,&nbsp;Nannan Wang ,&nbsp;Tonggang Zang ,&nbsp;Xianyong Cao ,&nbsp;Juzhi Hou","doi":"10.1016/j.gloplacha.2024.104592","DOIUrl":"10.1016/j.gloplacha.2024.104592","url":null,"abstract":"<div><div>Atmospheric dust has important influences on atmospheric circulation, global biogeochemical cycles, and hydrological processes. However, understanding the history of dust storms on the Tibetan Plateau (TP) remains challenging due to the lack of suitable geological archives. Lakes in dust-influenced regions act as dust repositories, offering the opportunity to trace the history of dust emissions and eolian activity. Here we present a synthesis of eolian activity on the eastern TP covering the past 15,000 years. It is based on records of grain size and <em>n</em>-alkanes from a sediment core from Gahai lake, which we combined with published pollen and other records from the same core, to reconstruct variations in surface runoff and eolian activity in this region. Our results indicate a correlation between vegetation conditions and eolian activity during different periods. Increased eolian activity occurred during the transition from the last deglaciation to the early Holocene, due to suboptimal vegetation conditions. Between 7.5 and 3.5 cal ka BP (ka), higher moisture levels resulted in the dominance of arboreal vegetation, which suppressed eolian activity. However, after 3.5 ka a sustained intensification of eolian activity occurred in the Gahai area, which was linked to decreasing vegetation cover, reduced regional humidity, and growing human impacts, especially in the eastern plateau, in southern Gansu. In recent decades, human interventions have suppressed eolian activity. Additionally, a ∼ 1435-year cyclicity in our record, and other regional records, suggests a link between increased eolian activity on the eastern TP and ice-rafting events in the North Atlantic. Generally, Holocene eolian dynamics were primarily influenced by the regional vegetation and climatic conditions which were controlled by the atmospheric circulation. However, in the late Holocene, climatic shifts and human influences had a synergistic effect which intensified the eolian activity, highlighting the important role of humans on recent dust dynamics in this region.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"242 ","pages":"Article 104592"},"PeriodicalIF":4.0,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142323614","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}

{"title":"Global carbon cycle disruption during the latest Pliensbachian (Lower Jurassic) evidenced by simultaneous isotopic depletion in marine and terrestrial carbon pools","authors":"C.S. O'Keeffe ,&nbsp;L. Schwark ,&nbsp;I. Bull ,&nbsp;H.L. Whelton ,&nbsp;F.L. Gill ,&nbsp;C.T.S. Little","doi":"10.1016/j.gloplacha.2024.104591","DOIUrl":"10.1016/j.gloplacha.2024.104591","url":null,"abstract":"<div><div>The Pliensbachian-Toarcian (Pl-To) boundary was marked by an extinction event in marine organisms, and localised ocean anoxia – resulting in the deposition of black shales. Negative isotopic excursions in bulk organic carbon in many of these black shales, are widely believed to indicate that a global carbon cycle disruption accompanied this extinction event. The Pl-To preceded a period of more intense global carbon cycle disruption that occurred during the Toarcian Oceanic Anoxic Event (T-OAE) by around a million years. It is evident from targeted carbon isotopic analyses of marine and terrestrial organic matter that simultaneous disruptions to the marine and terrestrial carbon cycles occurred during the T-OAE. However, it remains a matter of debate whether the main source of carbon emissions was a climate-sensitive methane reservoir, or volcanic processes. No records of terrestrial carbon cycle disruption exist for the latest Pliensbachian, and so the causal mechanisms behind localised anoxia in this stage of the Lower Jurassic are poorly constrained. We present a record of concomitant isotopic depletion in short and long-chain <em>n</em>-alkanes derived from a thin black shale (the Lower Sulphur Band – LSB) deposited during the latest Pliensbachian (located in Yorkshire, UK). A key argument is that simultaneous isotopic depletions in these different compound classes implies the presence of a brief global hyperthermal event in the latest Pliensbachian, with a timescale too short to have been captured by previous analyses of the Yorkshire section. We discuss the relevance of our data to the stratigraphic record of the Lower Jurassic sediments of Yorkshire, highlighting, in particular, the need for better constraint on the ammonite biostratigraphy of the study section. We further argue that the brief climate disruption that occurred in the latest Pliensbachian made the shallow marine environment vulnerable to the development of more widespread marine anoxia, during the succeeding Toarcian stage.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"242 ","pages":"Article 104591"},"PeriodicalIF":4.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0921818124002388/pdfft?md5=92040a9887e0bfe8ae09c0b1670bb7c8&pid=1-s2.0-S0921818124002388-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312086","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}

{"title":"Maastrichtian-Cenozoic erosional history of the northern Peruvian Amazonian Andes implications for the Eastern Cordillera evolution (Huallaga Basin, northern Peru)","authors":"Michele Andriolli Custódio ,&nbsp;Martin Roddaz ,&nbsp;Roberto Ventura Santos ,&nbsp;Elton Luiz Dantas ,&nbsp;Stéphane Brusset ,&nbsp;Mélanie Louterbach ,&nbsp;Christian Hurtado ,&nbsp;Guilherme Oliveira Gonçalves","doi":"10.1016/j.gloplacha.2024.104584","DOIUrl":"10.1016/j.gloplacha.2024.104584","url":null,"abstract":"<div><p>Late Cretaceous-Cenozoic Andean mountain building may have experienced various phases of orogenesis in response to variations the dip angle of the subducting slab, distinct magmatic pulses, and shortening rates of the orogen. The timing of the Eastern Cordillera (EC) erosion and the relationship between the Andean orogenesis and the establishing of the transcontinental Amazon River remains unclarified. The erosional history of the Amazon Andes and the timing of these orogenic events may be revealed by the late Cretaceous-Cenozoic sedimentary record of the Amazonian retroarc foreland basin. We investigate the provenance of the Maastrichtian-Cenozoic deposits of the Huallaga Basin based on major and trace elements concentrations, Sm<img>Nd isotopic composition, and U<img>Pb zircon dating. We also refined the Oligocene paleoenvironment and calculated Paleogene sedimentation rates. Our results show that despite the 25 Myr-long sedimentary hiatus, both the Maastrichtian and Eocene units show dominant sourcing from the magmatic arc of the Western Cordillera (WC). Increases in Paleozoic and Famatinian zircon grains and a shift toward more negative ƐNd(0) values, indicate dominant EC sources during the Oligocene to middle Miocene. This change in provenance area is Rupelian in age based on the Maximum Likelihood Age (MLA) of JUA22 (29.70 ± 0.62 Ma), suggesting that the onset of Peruvian EC erosion started at ∼30 Ma. The erosion of the EC was accompanied by an increase in sedimentation rates and the development of a meandering fluvial system. Finally, a substantial decrease in zircon grains derived from the Cretaceous and Cenozoic Andean arcs from late Miocene to Recent sediments suggests no contribution of the WC. In contrast, an increase in Paleozoic magmatic arc zircon grains indicates sources in the EC. We compare our findings to constrain the erosional history of the Amazonian Andes and investigate the relationship between the timing of EC uplift and the onset of the transcontinental Amazon drainage system during the Cenozoic.</p></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"242 ","pages":"Article 104584"},"PeriodicalIF":4.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142271849","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}

{"title":"Mercury enrichments as a paleo-volcanism proxy: Sedimentary bias and a critical analysis across the end-Triassic","authors":"Xia Hua ,&nbsp;David B. Kemp ,&nbsp;Jun Shen ,&nbsp;Runsheng Yin ,&nbsp;Xin Jin ,&nbsp;Chunju Huang","doi":"10.1016/j.gloplacha.2024.104589","DOIUrl":"10.1016/j.gloplacha.2024.104589","url":null,"abstract":"<div><div>Mercury (Hg) anomalies in sedimentary rocks have been increasingly used in paleoclimatology studies for tracing volcanic signals, as Hg emissions from volcanic activity can cause contemporaneous sedimentary Hg enrichment. However, non-volcanic sedimentary controls on Hg have clear potential to mask these signals. These factors include host phase variability linked to environmentally controlled sourcing and settling changes, and/or variable preservation conditions associated with weathering, oxidation and diagenesis. Such factors can limit the efficacy of Hg as a paleo-volcanism proxy. In this study, sedimentary effects on Hg concentration within a complex depositional system in southwest England (St. Audrie's Bay) across the end-Triassic have been analyzed, together with published data from coeval end-Triassic sections globally – an interval of time coeval with the Central Atlantic Magmatic Province (CAMP). Our statistical analysis of Hg and associated geochemical data highlights significant fluctuations in sedimentary Hg due to relative supply differences in Hg and host phases, as well as the changing types and preservation conditions of host phases. End-Triassic sections globally show a consistent undersupply of Hg relative to organic matter across the end-Triassic mass extinction (ETME). To better assess the magnitude and significance of possible Hg enrichments in sedimentary rocks, we present a statistical method for quantifying Hg anomalies to robustly distinguish Hg variations linked to host phase/depositional changes from paleo-volcanism. Our method supports the existence of transient but asynchronous Hg anomalies linked to volcanism from the CAMP across the end-Triassic in most global sections, albeit not in the St. Audrie's Bay section.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"242 ","pages":"Article 104589"},"PeriodicalIF":4.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312087","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}

{"title":"Climate change driven by LUCC reduced NPP in the Yellow River Basin, China","authors":"Weijiao Wang ,&nbsp;Yaobin Wang ,&nbsp;Shiyan Zhai ,&nbsp;Haoming Xia ,&nbsp;Dong Wang ,&nbsp;Hongquan Song","doi":"10.1016/j.gloplacha.2024.104586","DOIUrl":"10.1016/j.gloplacha.2024.104586","url":null,"abstract":"<div><p>Anthropogenic activities and the resulting climate change affect the type, structure, and function of ecosystems. Understanding vegetation dynamics related to anthropogenic activities and climate change is critical to address the terrestrial carbon cycle in the context of global warming. The objective of this study is to quantify the effects of human-induced land use and land cover change (LUCC) and LUCC-induced climate change on terrestrial net primary productivity (NPP) in the Yellow River Basin (YRB) during 2000–2020 using Weather Research and Forecasting (WRF) model and Integrated Biosphere Simulator (IBIS) model through different experimental scenarios. Results indicated that LUCC can cause an increase in NPP of 1.2 ± 0.67 gC m⁻² yr⁻¹ in YRB. The increased precipitation and decreased temperature due to LUCC showed weak negative effect on annual mean NPP in YRB (−0.2 ± 0.74 gC m⁻² yr⁻¹). The coupling of LUCC and LUCC-induced climate change increased annual mean NPP approximately 0.6 ± 0.86 gC m⁻² yr⁻¹. The impacts of LUCC and LUCC-induced climate change and their coupling effects on NPP were greatest in spring, increasing NPP by 5.1 ± 0.51, 3.4 ± 0.41, and 6.1 ± 0.79 gC m⁻² yr⁻¹, respectively. These findings provide important guidance for the sustainable and adaptive management of terrestrial ecosystems in river basin in the context of global change.</p></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"242 ","pages":"Article 104586"},"PeriodicalIF":4.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142271899","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}

{"title":"Spatiotemporal variability of leaf critical senescence age across northern lands and its key drivers","authors":"Xingli Xia,&nbsp;Cuihai You,&nbsp;Ruiling Lu,&nbsp;Ning Wei,&nbsp;Chenyu Bian,&nbsp;Ying Du,&nbsp;Erqian Cui,&nbsp;Songbo Tang,&nbsp;Zhiqin Tu,&nbsp;Jiaye Ping,&nbsp;Kun Huang,&nbsp;Jianyang Xia","doi":"10.1016/j.gloplacha.2024.104587","DOIUrl":"10.1016/j.gloplacha.2024.104587","url":null,"abstract":"<div><div>Leaf senescence, a pivotal phenological event, signifies the aging of vegetation canopies and triggers abrupt shifts in various biogeochemical processes. However, the spatiotemporal pattern of leaf senescence age and its primary driving factors across northern lands remains unclear. In this study, we introduced a concept termed leaf critical senescence age (CSA) to characterize the initiation of senescence stage, which quantifies the time span between the onset dates of vegetation growth and senescence. Then, utilizing long-term remote sensing vegetation index data, we investigated the spatiotemporal variations of leaf CSA over northern lands (&gt;30°N). Spatially, leaf CSA displayed extensive variability (ranging from 42 to 263 days), with an average of 146 ± 32 days. Deciduous broadleaf forests exhibited the longest CSA (177 ± 28 days), while shrublands demonstrated the shortest (121 ± 22 days). Temporally, most plant functional types experienced a reversal in leaf CSA trends around 2010, leading to the contrasting trends between 1982–2010 (+0.21 days/year) and 2010–2015 (−2.36 days/year) across northern lands. Further random-forest regression and partial correlation analysis together indicated that temperature was the dominant factor driving spatiotemporal variations in leaf CSA. These findings suggest that climate warming is reshaping the geographical pattern of leaf senescence age, posing great uncertainty to future projections of terrestrial feedback to climate change.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"242 ","pages":"Article 104587"},"PeriodicalIF":4.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312088","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}