Global and Planetary Change最新文献

{"title":"The origin of ferruginous concretions on the Sunda Shelf (SE Asia) and its environmental implications","authors":"Kaikai Wu ,&nbsp;Xuefa Shi ,&nbsp;Shengfa Liu ,&nbsp;Franck Bassinot ,&nbsp;Christophe Colin ,&nbsp;Hui Zhang ,&nbsp;Che Abd. Rahim Mohamed","doi":"10.1016/j.gloplacha.2024.104687","DOIUrl":"10.1016/j.gloplacha.2024.104687","url":null,"abstract":"<div><div>Marine concretions are an important source of information regarding resources, climate, and environment. However, the genesis of ferruginous concretions on the continental shelf remains unclear. In this study, we present the radiocarbon ages (AMS¹⁴C), elemental compositions, and mineral compositions of ferruginous concretions obtained from a gravity core on the central Sunda Shelf. The results indicate that the formation ages of ferruginous concretions range from 10.5 to 7.5 cal ka BP from the bottom to the top of the core. The predominant mineral identified in these concretions is goethite, which cements clay and other minerals in colloidal form. Notably, Fe, Si, and Al display distinct ring-band rhythmic variations. Our study suggests that ferruginous concretions are formed in subaerial and aqueous environments, with a weathered stiff clay layer serving as the main stratum for concretion development. During periods of low sea levels (before 10.5 cal ka BP), paleo-channels likely provided fluctuating wet and dry conditions for the formation of light and dark concentric layers within ferruginous concretions. Between 10.5 and 7.5 cal ka BP, the Sunda Shelf was gradually inundated, leading to the partial transport of concretions from nearby channels. Subsequently, after 7.5 cal ka BP, the paleo-channels became completely submerged, halting the formation of ferruginous concretions on the Sunda Shelf. Meanwhile, ferruginous concretions on the seafloor became mixed with sediments and marine organisms due to hydrodynamic sorting. The presence of ferruginous concretions can serve as an indicator of paleo-channel locations, aiding in the reconstruction of paleo-channel systems during periods of low sea level on the shallow continental shelf.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"245 ","pages":"Article 104687"},"PeriodicalIF":4.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142905666","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":"Enhanced biological pump and carbonate pump synergy: The primary pathway for phosphorus clearance in the century-long dynamics of a karst lake","authors":"Haibo He ,&nbsp;Zaihua Liu ,&nbsp;Jingan Chen ,&nbsp;Dongli Li ,&nbsp;Yuyouting Wang ,&nbsp;Yongqiang Han ,&nbsp;Xing Liu ,&nbsp;Hailong Sun ,&nbsp;Quan Chen ,&nbsp;Wenfang Cao","doi":"10.1016/j.gloplacha.2025.104694","DOIUrl":"10.1016/j.gloplacha.2025.104694","url":null,"abstract":"<div><div>Lakes exhibit a biological pump (BP) effect, akin to marine systems, acting as a carbon sequestration mechanism. In karst lakes, the BP works in synergy with a more efficient carbonate pump (CP), enhancing phosphorus (P) removal. This synergy provides a plausible explanation for the observed P enrichment in karst lake sediments. It is hypothesized that an enhanced BP effect drives the CP, accelerating the co-precipitation of carbonates with P, resulting in the accumulation of calcium-bound P compounds (Ca<img>P). However, these hypotheses remain largely unquantified and unverified. Research into centennial-scale multi-proxy sedimentary records from Fuxian Lake, a representative karst lake in China, showed significant correlations among organic and inorganic carbon, including contents, fluxes, and isotopic profiles, demonstrating the interplay between the BP and the CP. Carbonate δ¹⁸O data further support the conclusion that the BP is the primary driver of the CP. Moreover, a strong correlation (<em>r</em> &gt; 0.6, <em>P</em> &lt; 0.0001) between organic-inorganic carbon proxies and sedimentary P has been identified. Compared to phytoplankton, submerged plants significantly boost P co-precipitation (forming Ca<img>P) through the BP mechanism by facilitating a more efficient CP. Ca<img>P, the main component within stable sedimentary P reservoirs, saw a post-1950 burial flux increase to 3.5 times that of the preceding period, reaching 0.24 g P m⁻² yr⁻¹. This underscores the CP's effectiveness in P sequestration under increased anthropogenic pressure. Given the uniquely high weathering rates, Ca²⁺, pH, and dissolved inorganic carbon content of karst lakes, we suggest that their strong BP effect, combined with the CP, significantly enhances P removal, offering an autogenic solution to eutrophication.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"245 ","pages":"Article 104694"},"PeriodicalIF":4.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142975634","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":"Magnetic evidence of redox transition event in the Okinawa Trough during the early-middle Holocene and its links to the Kuroshio Current evolution","authors":"Feng Wang ,&nbsp;Tuqin Huang ,&nbsp;Zhongbo Wang ,&nbsp;Weiguo Zhang ,&nbsp;Pengyu Qiao ,&nbsp;Haiyan Tang ,&nbsp;Xi Mei ,&nbsp;Ping Yin ,&nbsp;Zhongping Lai","doi":"10.1016/j.gloplacha.2025.104699","DOIUrl":"10.1016/j.gloplacha.2025.104699","url":null,"abstract":"<div><div>The Kuroshio Current significantly influences the physical, chemical, and biological properties in the western Pacific Ocean, while its strength and path in the Okinawa Trough during the Holocene remains unclear. Previous studies have not established consistent conclusions due to the multiple explanations for sediment provenance proxies, but these inconsistencies can potentially be addressed by identifying redox variability through diagenetic effects on magnetic minerals. Magnetic data (χ, SIRM, χ_ARM, and S-ratios) obtained from cores SHDZ10 and A4 in the middle Okinawa Trough indicate an intensified reductive diagenesis effect prior to the early-middle Holocene period, whereas a contrasting trend is observed since the early-middle Holocene. Geochemical analyses (Mo, Mn, Mo/Mn, Mn/Al, TOC and TS) and <em>Pulleniatina obliquiloculata</em> content variations suggest that the decrease in early diagenesis since early-middle Holocene was a consequence of increased oxygenation, which is related to a strengthened Kuroshio Current and enhanced deep-water ventilation. By synthesizing the observed redox transition phenomena in nearby sediment cores (MD012403, MD012404, KX12–3, MD063–05, CSH1), we discover a coherent redox transition event during the early-middle Holocene. The occurrence ages show millennial-scale variability from south to north, which may suggest a periodic northward movement trajectory of a strengthened Kuroshio Current. This study not only provides novel insights into the reconstruction of the Kuroshio Current evolution, but also highlights the applicability of environmental magnetism methods in investigating deep-water ventilation.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"245 ","pages":"Article 104699"},"PeriodicalIF":4.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142975631","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":"Regulation and response of heterotrophic bacterial production to environmental changes in marginal seas of the Western Pacific Ocean","authors":"Qiao Liu ,&nbsp;Jinyan Wang ,&nbsp;Xiao-Jun Li ,&nbsp;Ni Meng ,&nbsp;Gui-Peng Yang ,&nbsp;Guiling Zhang ,&nbsp;Guang-Chao Zhuang","doi":"10.1016/j.gloplacha.2024.104678","DOIUrl":"10.1016/j.gloplacha.2024.104678","url":null,"abstract":"<div><div>Heterotrophic bacterial production represents an important part of microbial food web processes in marine ecosystems and plays a significant role in biogeochemical carbon cycle. As environmental factors have changed in marginal seas of the Western Pacific Ocean over the past 20 years, the response and regulation of bacterial production remain poorly understood. In this study, we quantified bacterial production rates using the ³H-leucine incorporation method and investigated the factors influencing bacterial production distributions in the East China Sea and the Yellow Sea. Our data revealed that bacterial production varied largely (1.6–24.4 mg C m⁻³ d⁻¹) in the surface waters, and higher rates were observed at temperate sites in the East China Sea. Incubation experiments under different temperature or nutrient conditions demonstrated that elevated temperature or the addition of silicate, DIN and phosphate could simulate heterotrophic activity. The decadal increases of BP could be a result of microbial response to the variations in temperature, nutrient levels, and dissolved oxygen that are closely linked to food-web dynamics and biogeochemical processes. High ratios of integrated bacterial production to primary production suggested bacterial production could be supported by non-phytoplanktonic carbon sources, while the low bacterial growth efficiency indicated that a large fraction of carbon was respired in the offshore waters. These results provided insights into the regulations of BP and heterotrophic response to environmental evolution in marginal seas of the Western Pacific Ocean.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"245 ","pages":"Article 104678"},"PeriodicalIF":4.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142884636","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":"Late Miocene-early Pliocene hydroclimate evolution of the western Altiplano, northern Chile: Implications for aridification trends under warming climate conditions","authors":"Carlie Mentzer ,&nbsp;Carmala Garzione ,&nbsp;Carlos Jaramillo ,&nbsp;Luis Felipe Hinojosa ,&nbsp;Jaime Escobar ,&nbsp;Nataly Glade ,&nbsp;Sebastian Gomez ,&nbsp;Deepshikha Upadhyay ,&nbsp;Aradhna Tripati ,&nbsp;Kaustubh Thirumalai","doi":"10.1016/j.gloplacha.2024.104674","DOIUrl":"10.1016/j.gloplacha.2024.104674","url":null,"abstract":"<div><div>The Miocene-Pliocene boundary (∼5.3 million years ago, Ma) represents a climate transition, where global warming resulted in a rise in sea surface temperatures from near modern values in the late Miocene, to sustained, warmer than modern values in the early Pliocene. Estimated atmospheric CO₂ concentrations were within the range of anthropogenic values. Thus, this transition provides an opportunity to evaluate hydroclimate responses to warming, when the Earth system was in equilibrium with near modern atmospheric CO₂ levels. Here, we utilize lacustrine carbonate stable and clumped isotope methods, and palynology, to investigate hydroclimate trends within the western Altiplano of Chile during the late Miocene and early Pliocene. The results provide observational support for a warmer and wetter-than-modern climate over these timeframes. However, increasing aridity across the Miocene-Pliocene boundary suggests a hydroclimate response to global climate forcing. Given the sensitivity of the region's climate to disturbances in tropical Pacific, ocean-atmospheric processes, we speculate that this aridification may reflect progressive weakening of the Pacific Walker Circulation, in response to global warming.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"245 ","pages":"Article 104674"},"PeriodicalIF":4.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142841207","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":"From holocene to anthropogenic impact: Surpassing coral's pH up-regulation capacity under ocean acidification","authors":"Huiling Kang ,&nbsp;Xuefei Chen ,&nbsp;Guangchao Deng ,&nbsp;Jian-xin Zhao ,&nbsp;Gangjian Wei","doi":"10.1016/j.gloplacha.2024.104683","DOIUrl":"10.1016/j.gloplacha.2024.104683","url":null,"abstract":"<div><div>Corals' regulation of internal calcifying fluid (CF or cf) chemistry is crucial for their extraordinary calcification capacity, endowing them with a certain ability to cope with environmental changes such as anthropogenic ocean acidification (OA) and warming. However, it remains unclear whether the impacts of these changes on corals have substantially surpassed their regulation capacity, particularly in comparison to the CF chemistry responses to natural climate variability with minor or no human perturbation. In this study, we reconstructed the pH, dissolved inorganic carbon, and carbonate ion concentrations in coral CF (pH_cf, DIC_cf, and [CO₃²⁻]_cf) during the Mid- to Late-Holocene, by analyzing the skeletal δ¹¹B and B/Ca of 80 <em>Porites</em> spp. from eastern Hainan Island in the South China Sea (SCS). Our records indicate considerable inter-colony variations in CF chemistry, with maximum disparities reaching 0.18 units for pH_cf and 1664 μmol/kg for DIC_cf. With this in mind, we found no clear responses of coral DIC_cf to the climate fluctuations during the past ∼5500 years, nor evident differences in pH_cf and [CO₃²⁻]_cf across pre-industrial natural epochs. However, pH_cf and [CO₃²⁻]_cf of modern corals have significantly declined compared to fossil corals. Further analyzes compiling global data on <em>Porites</em> spp. also confirm this pronounced pH_cf decrease in modern corals, suggesting the limitations of pantropical corals to counteract OA by up-regulating pH_cf. Importantly, these fossil and modern corals reveal a clear long-term pH_cf descending trend parallel to atmospheric CO₂ changes, supporting the reliability of coral δ¹¹B in recording long-term changes in seawater pH (pH_sw).</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"245 ","pages":"Article 104683"},"PeriodicalIF":4.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142905670","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":"Marine productivity controlled by oceanic circulation in the Northwest Pacific over the last glacial cycle","authors":"Limin Hu ,&nbsp;Hao Fang ,&nbsp;Xuefa Shi ,&nbsp;Yuying Zhang ,&nbsp;Zhifei Duan ,&nbsp;Chao Li ,&nbsp;Jörg Lippold ,&nbsp;Minoru Ikehara ,&nbsp;Yiming Luo","doi":"10.1016/j.gloplacha.2024.104686","DOIUrl":"10.1016/j.gloplacha.2024.104686","url":null,"abstract":"<div><div>The oceanic carbon cycles have a significant effect on the climate transitions by influencing the atmospheric CO₂ levels. As one of the largest carbon sinks, the Northwest Pacific is the key to understand how the carbon cycles react to past and future climate changes. In this study, the marine productivity in Northwest Pacific over the last 25,000 years has been comprehensively reconstructed using ²³⁰Th-normalized biogenic fluxes recorded in a series of sedimentary cores. Our results show contrasting onsets of productivity pulse between cores from the subarctic and the subtropical gyres, while both have been controlled by the nutrient supply related to ocean circulation. Specifically, the wind-driven southward shift of subarctic gyre combined with stronger East Asia winter monsoon during the Last Glacial Maximum and early deglaciation supplied more nutrients to the south and stimulated the subtropical productivity, while this process synchronously limited the subarctic productivity especially with downward extension of the North Pacific Intermediate Water (NPIW). The contraction of subarctic gyre associated with the collapse of the NPIW during the Bølling-Allerød generated the productivity pulse in subarctic region and lowered the subtropical productivity. Terrigenous inputs, reconstructed from ²³²Th fluxes, however, mainly affected the productivity in the subtropical gyre over the last glacial cycle, especially for the marginal region, in contrast to the pelagic subarctic gyre. Our findings reveal an interplay between subarctic and subtropical gyres and their integrated impacts on marine productivity, providing a paleoceanographic perspective to understand the carbon budget across different timescales in the Northwest Pacific.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"245 ","pages":"Article 104686"},"PeriodicalIF":4.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142905675","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":"About 868 cal. yr BP tsunami event at the northern South China Sea revealed from offshore sediments","authors":"Yuming Wang ,&nbsp;Xiaohong Chen ,&nbsp;Adam D. Switzer ,&nbsp;Linlin Li ,&nbsp;Yang Xu ,&nbsp;Yukun Wang ,&nbsp;Elaine Tan ,&nbsp;Peizhen Zhang","doi":"10.1016/j.gloplacha.2024.104685","DOIUrl":"10.1016/j.gloplacha.2024.104685","url":null,"abstract":"<div><div>The northern coast of the South China Sea (SCS) is a densely populated and economically important area. Despite the absence of any tsunamigenic events in the last century in this region, their occurrence on a much longer timescale remains largely unknown. Given the catastrophic consequences a potential tsunami event could bring, we aim to bridge this research gap by conducting high-resolution sedimentological, geochemical, and geochronological analyses on two well-preserved offshore sedimentary columns, B01 and D02, from the northern SCS, at depths of −27 and − 46 m, respectively. Using statistical methods, we identified two anomalous sediment units, each ∼30 to 40 cm thick, in both columns. These units are dominated by coarse-grained, poorly sorted sediments with a normally graded sequence. Each unit is rich in biogenic debris, devoid of parallel or cross-bedding, and has a unique set of elemental and isotopic signatures. They contain allochthonous biological species and record a disordered age-depth pattern. Such observations are indicative of the sudden input of marine components, suggesting an instantaneous high-energy event. The median calibrated ages, measured by accelerator mass spectrometry (AMS), from shell and foraminifera in the anomalous units, return the mixed ages of 4454–842 cal. yr BP and 2098–840 cal. yr BP, respectively. Shell and foraminifera above and below the anomalous units define AMS ¹⁴C ages of 951–779 cal. yr BP, with a median age of ∼868 cal. yr BP. Our data collectively point to a tsunami event at ∼868 cal. yr BP, equivalent to the North-Song Dynasty of ∼1000 years ago. This age pattern is consistent with reported tsunami events in and around the SCS, also compatible with historical accounts describing a “tidal overflow in Eastern Guangdong and Eastern Fujian at AD1067–1068” in Chinese documents. Combined with available data, the ca 868 cal. yr BP tsunami event in the SCS likely originated from the joint interaction of earthquakes induced by the Manila Subduction Zone and the Littoral Fault Zone, along with related landslide activities within the northern SCS.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"245 ","pages":"Article 104685"},"PeriodicalIF":4.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142975682","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":"Astronomically forced dynamics of Late Devonian (Famennian) sea level and biotic recovery in western Junggar, Northwest China","authors":"Kunyuan Ma ,&nbsp;Linda Hinnov ,&nbsp;Zhihong Wang ,&nbsp;Kai Wang ,&nbsp;Ruiwen Zong ,&nbsp;Xinsong Zhang ,&nbsp;Junjun Song ,&nbsp;Yang Bai ,&nbsp;Yiming Gong","doi":"10.1016/j.gloplacha.2024.104677","DOIUrl":"10.1016/j.gloplacha.2024.104677","url":null,"abstract":"<div><div>The Hongguleleng Formation in western Junggar, northwest China preserves a rich variety of fossils and was previously regarded as a “refugium” during the Late Devonian biotic crisis. Uncertainty in the age of the Hongguleleng Formation has persisted for a considerable time. In this study, cyclostratigraphic analysis was carried out on the Upper Devonian Bulongguoer and Wulankeshun sections from western Junggar, northwest China. Time series analysis and modeling of iron (Fe) concentration proxy data reveal variations with frequencies comparable to those of the Earth's long and short orbital eccentricity, obliquity, and precession index in both successions. Interpreted 405-kyr long orbital eccentricity cycles were used to establish floating astronomical time scales (FATs) for the two successions. From these FATs the depositional duration of the Hongguleleng Formation is calculated as 11.5 ± 0.58 Myr. The Devonian-Carboniferous boundary age of 359.3 ± 0.3 Ma was chosen as a time “anchor”, resulting in an astronomically determined age of 370.2 ± 0.66 Ma for the base of the Hongguleleng Formation. Combined with conodont biostratigraphy, this age indicates that the Hongguleleng Formation in western Junggar does not reach down to the Frasnian-Famennian boundary. Sedimentary noise modeling of the reconstructed Fe concentration time series provides an interpretation of sea-level variations in the Paleo-Asian Ocean controlled by astronomical forcing from very long orbital eccentricity cycles (<em>g</em>₄–<em>g</em>₃) throughout the Late Devonian period. Intensified monsoonal climates during these orbital eccentricity cycle maxima led to elevated terrigenous input and strengthened upwelling, which enhanced primary productivity in the western Junggar. We propose an “astronomical climate change” model as a driving mechanism that led to biotic recovery in the Famennian Hongguleleng Formation.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"245 ","pages":"Article 104677"},"PeriodicalIF":4.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142841257","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":"Sedimentary responses to climatic variations and Kuroshio intrusion into the northern South China Sea since the last deglaciation","authors":"Chao Huang ,&nbsp;Liyuan Wu ,&nbsp;Jiansen Cheng ,&nbsp;Xiaoxu Qu ,&nbsp;Yongyi Luo ,&nbsp;Huiling Zhang ,&nbsp;Feng Ye ,&nbsp;Gangjian Wei","doi":"10.1016/j.gloplacha.2024.104671","DOIUrl":"10.1016/j.gloplacha.2024.104671","url":null,"abstract":"<div><div>The terrigenous sediment source-to-sink processes in marginal seas are governed by intricate interactions among climate, sea level, and ocean currents. The continental slope of the northern South China Sea (SCS) provides an excellent setting to examine these processes due to its substantial terrigenous influx and continuous sedimentation. In this study, we present a high-resolution sedimentary record from the northern SCS continental slope covering the last deglaciation. Analyses of Rare Earth Elements (REEs) and Sr–Nd isotopic compositions in the NH07 core indicate that the predominant source of terrigenous sediment was Taiwan. Grain size-standard deviation analysis identified two sensitive grain size components, with the sensitive component 2 used as a marker of the Kuroshio intrusion into the northern SCS through Luzon Strait. The intensity of the Kuroshio intrusion into the northern SCS was found to be inversely related to that of the open Pacific. The Asian monsoon and El Niño-Southern Oscillation (ENSO) significantly influenced the variability of the Kuroshio Current throughout the deglaciation period. During the interval 16, 000–11, 700 cal yr BP, variations in terrigenous influx were collectively driven by sea level changes and the intensity of the Kuroshio intrusion, while chemical weathering intensity was affected by the reworking of previously exposed shelf sediments due to sea level fluctuations. During the Holocene, however, the East Asian summer monsoon intensity became the primary factor influencing variations in terrigenous influx and chemical weathering.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"245 ","pages":"Article 104671"},"PeriodicalIF":4.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142841259","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}