Global and Planetary Change最新文献

{"title":"Half-day (daytime and nighttime) precipitation extremes in China: Changes and attribution from 1981 to 2022","authors":"Jiahao Han ,&nbsp;Shibo Fang ,&nbsp;Xiaomao Lin ,&nbsp;Zhanhao Zhang ,&nbsp;Man Li ,&nbsp;Yanru Yu ,&nbsp;Wen Zhuo ,&nbsp;Xinyu Wang","doi":"10.1016/j.gloplacha.2025.104696","DOIUrl":"10.1016/j.gloplacha.2025.104696","url":null,"abstract":"<div><div>Increased atmospheric water vapor pressure due to the warming climate has led to more frequent and extreme precipitation events, which has resulted in incalculable losses. The hydrothermal circulation suggests that extreme daytime and nighttime precipitation patterns can have many distinct consequences,ranging from changes in various scale hydrological cycles to social security concerns. However, the spatio-temporal patterns of daytime and nighttime precipitation events remain underexplored, lacking quantitative analysis. Therefore, our study analyzed daily precipitation data (including 24-h, daytime, and nighttime) from 1981 to 2022 across China to investigate extreme precipitation patterns at a half-day scale (daytime and nighttime). Fourteen monthly extreme indices associated with atmospheric circulations and sea surface temperatures were examined to clarify precipitation distribution patterns using random forest and optimal fingerprinting techniques. The main findings are: (1) A clear upward trend was found in cumulative precipitation, intensifying the frequency of extreme precipitation events. Notably, the increase in both accumulated 24-h precipitation and the rate of nighttime precipitation exceeded the rate of daytime precipitation between 1981 and 2022. This trend became more pronounced as precipitation events became more extreme. (2) Most regions in China exhibited an increasing trend in both cumulative precipitation days and total precipitation, particularly in the North China Plain, although the Yunnan-Guizhou Plateau saw significant decreases in both variables. (3) Extreme precipitation events were primarily driven by changes in the different types of the Subtropical High (Western Pacific, South China Sea, and Northern Hemisphere Subtropical High), along with the typhoons southeast of the Hu Huanyong line. These findings enhance the understanding of hydrothermal exchange processes and extreme precipitation, providing a useful basis for climate change adaptations in China.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"245 ","pages":"Article 104696"},"PeriodicalIF":4.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142935463","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":"Response of carbonate rock weathering carbon sink to seismic peak ground acceleration in China","authors":"Minghui Li ,&nbsp;Qiu Tan ,&nbsp;Guangjie Luo ,&nbsp;Chaojun Li ,&nbsp;Chen Ran ,&nbsp;Sirui Zhang ,&nbsp;Lian Xiong ,&nbsp;Jingjing Liao ,&nbsp;Chaochao Du ,&nbsp;Zilin Li ,&nbsp;Yingying Xue ,&nbsp;Mingkang Long ,&nbsp;Qing Luo ,&nbsp;Xiaoqian Shen ,&nbsp;Shu Yang ,&nbsp;Xiaoyun Zhang ,&nbsp;Yuanhuan Xie ,&nbsp;Xiaoyong Bai","doi":"10.1016/j.gloplacha.2025.104729","DOIUrl":"10.1016/j.gloplacha.2025.104729","url":null,"abstract":"<div><div>Seismic peak ground acceleration (PGA) is a key indicator to characterize the strength of seismic effects, which affects the rate of chemical weathering of carbonate rocks and the ability to capture CO₂. However, the response mechanism and process of Carbonate rock weathering Carbon Sink (CCS) to PGA are not clear. To this end, this paper clarifies the spatial and temporal patterns of CCS in China and reveals their response to PGA based on PGA, climate, lithology and other datas, combined with methods such as the random forest model and maximal potential dissolution model. The results showed that the CCS Flux(CCSF) was 5.32 t C km⁻² yr⁻¹ and the Full CCS (FCCS) was 1346 × 10⁴ t C yr⁻¹, which was influenced by PGA, with the flux being the largest at 0.05 g PGA (5.38 t C km⁻² yr⁻¹), mainly in the south-western part of the country where hydrothermal conditions are favourable. Meanwhile, the response of CCS to PGA was affected by latitude and altitude divergence. CCS at the same latitude showed a fluctuating downward trend with the enhancement of PGA. Two trends of CCS and PGA at the same altitude appeared, one was that CCS increased with the enhancement of PGA when the altitude was less than 2500 m as well as 4500–6500 m, and the other was that CCS decreased with the enhancement of PGA when the altitude was 2500–4500 m. At the same PGA, CCS decreased with increasing latitude and elevation, respectively. This may be due to the fact that higher altitude and latitude are associated with lower temperatures, which affects the rate of chemical weathering of carbonate rocks, and hence CCS. The aim of this paper is to understand the response relationship between CCS and PGA, which helps to reveal how geologic activities affect the carbon cycle. The results of the study bridge the gap between tectonic geology and CCS systematic research to a certain extent, and promote the integration of the disciplines. This is of great significance for assessing the potential impact of natural disasters such as earthquakes on carbon sinks.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"246 ","pages":"Article 104729"},"PeriodicalIF":4.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143124537","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 susceptibility cyclostratigraphy of the lower Schwarzrand Subgroup in southern Namibia refines temporal calibration of late Ediacaran bilaterian radiation","authors":"Zheng Gong ,&nbsp;Iona Baillie ,&nbsp;Lyle L. Nelson ,&nbsp;Stacey H. Gerasimov ,&nbsp;Catherine Rose ,&nbsp;Emily F. Smith","doi":"10.1016/j.gloplacha.2024.104668","DOIUrl":"10.1016/j.gloplacha.2024.104668","url":null,"abstract":"<div><div>The Nama Group in southern Namibia captures one of the best-preserved records of the last ∼10 million years of the Ediacaran Period, recording pivotal changes to Earth's biosphere and oceans. Within the Nama Group, the lower Schwarzrand Subgroup preserves early complex bilaterian trace fossils, but uncertainties surrounding the ages of their first occurrences hinder global correlation and the understanding of the rates at which critical biological changes occurred. This study presents magnetic susceptibility cyclostratigraphy of a recently acquired drill core that covers the Nudaus Formation and Nasep Member within the lower Schwarzrand Subgroup. Spectral analysis reveals a hierarchy of orbital cycles that could be responsible for the repeating depositional sequences at various length scales in the Schwarzrand Subgroup. Matching the wavelengths of the orbital cycles to their expected periodicities, we established sedimentation rates throughout the stratigraphy. Utilizing available U<img>Pb ages from correlative outcrop sections and the sedimentation rates from cyclostratigraphy, we refine the age-depth model for the lower Schwarzrand Subgroup. Our new age-depth model places tighter temporal constraints on the first appearances of complex trace fossils, thus constraining the earliest major radiation of bilaterian metazoans and contributing to a better-calibrated chronostratigraphy of the terminal Ediacaran Period.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"245 ","pages":"Article 104668"},"PeriodicalIF":4.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142797879","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":"Holocene dust activity in inland Asia driven by both the mid-latitude Westerlies and the East Asian winter monsoon","authors":"Haipeng Wang ,&nbsp;Jianhui Chen ,&nbsp;Yuanhao Sun ,&nbsp;Ruijin Chen ,&nbsp;Nasetay Aydenbek ,&nbsp;Jianbao Liu","doi":"10.1016/j.gloplacha.2024.104661","DOIUrl":"10.1016/j.gloplacha.2024.104661","url":null,"abstract":"<div><div>Inland Asia is a major global source of dust and the dust transport from this region has global implications. However, the processes and forcing mechanisms of dust activity in inland Asia during the Holocene are still debated due to the lack of high-quality records with accurate dating, unambiguous dust signals, and a high resolution. Here we present a well-dated record of dust activity based on the Ti content of the sediments of Shuanghu Lake, in the southern Altai Mountains, with a ∼ 15-yr-resolution and covering the entire Holocene. This record shows a gradual decrease in dust intensity during ∼11.7–6 thousand years ago (ka), followed by a persistent increase since ∼6 ka. Frequent dust events are also evident, lasting hundreds of years, and are superimposed on the millennial-scale trend, corresponding to the nine North Atlantic Bond events. We propose that the millennial-scale trend of dust activity was primarily influenced by variations in the mid-latitude Westerlies, while the dust events on the centennial scale were driven primarily by a strengthened East Asian winter monsoon. Overall, this study provides a reliable, high-resolution record of Holocene dust activity in inland Asia, and it updates the previous view that dust activity in this region was solely controlled by the mid-latitude Westerlies or the Siberian High. Our findings contribute to an improved understanding of global dust transport with implications for predicting future dust activity in this region.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"245 ","pages":"Article 104661"},"PeriodicalIF":4.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142797881","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":"Pacific Walker Circulation modulated millennial-scale East Asian summer monsoon rainfall variability over the past 40 kyr","authors":"Yi Zhong ,&nbsp;Yuxing Liu ,&nbsp;Xiaojing Du ,&nbsp;Xiaoxu Shi ,&nbsp;Xing Xu ,&nbsp;Zhengyao Lu ,&nbsp;Stefanie Kaboth-Bahr ,&nbsp;Mark J. Dekkers ,&nbsp;Juan C. Larrasoaña ,&nbsp;Keiji Horikawa ,&nbsp;Chijun Sun ,&nbsp;Liang Ning ,&nbsp;André Bahr ,&nbsp;Yanan Zhang ,&nbsp;Debo Zhao ,&nbsp;Jiabo Liu ,&nbsp;Wenyue Xia ,&nbsp;Jingyu Zhang ,&nbsp;Sheng Yang ,&nbsp;Hai Li ,&nbsp;Qingsong Liu","doi":"10.1016/j.gloplacha.2024.104676","DOIUrl":"10.1016/j.gloplacha.2024.104676","url":null,"abstract":"<div><div>The millennial-scale hydroclimate variability in East Asia has been debated for a long time due to the lack of reliable precipitation records from southern China and inconsistent model simulations. Here, we reconstruct a 40-kyr rainfall record for southern China and Taiwan based on enviro-magnetic and clay mineral proxy parameters from a northern South China Sea marine sediment core. Both proxies suggest reduced East Asian Summer Monsoon (EASM) precipitation in the southern China-Taiwan region during North Atlantic cooling episodes. After integration with other EASM precipitation records and modeling results, we conclude that the spatial precipitation pattern across Southeast Asia is closely related to the strength of the Pacific Walker Circulation. This interpretation is supported by a model simulation that emphasizes the role of the Walker Circulation in transferring North Atlantic climate variability to the East Asian hydroclimate. Our findings contribute to resolving the disparities between precipitation proxies and model simulations in Southeast Asia.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"245 ","pages":"Article 104676"},"PeriodicalIF":4.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142841258","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 Rowley Shoals atolls: Remnants of a Miocene great barrier reef on the north-west Australian margin","authors":"Jackson C. McCaffrey ,&nbsp;Stephen J. Gallagher ,&nbsp;Malcolm W. Wallace ,&nbsp;Tanita Averes ,&nbsp;Stanislaus G. Fabian ,&nbsp;Katja Lindhorst ,&nbsp;Lars Reuning ,&nbsp;Sebastian Krastel","doi":"10.1016/j.gloplacha.2024.104688","DOIUrl":"10.1016/j.gloplacha.2024.104688","url":null,"abstract":"<div><div>The tropical North West Shelf of Australia hosts a diverse range of modern reefs. Six shelf edge isolated atolls are present north of 18°S including: Ashmore Reef, Scott Reef and Seringapatam Reef, and three Rowley Shoals. The Ningaloo Reef is a fringing reef around the North West Cape at 22°S. All of these reefs are the remnants of a vast 2000 km long barrier reef that drowned during the Late Miocene (∼10 Ma). Despite extensive hydrocarbon exploration in the region, the history of these isolated reefs is not well known. Seismic analyses combined with stratigraphic analyses of International Ocean Discovery Site U1464 near the Rowley Shoals has revealed that these modern isolated atolls have a complex evolution related to climate and tectonism as they managed to survive on their Miocene barrier reef foundation.</div><div>The first Miocene reefs (∼17 Ma) near the Rowley Shoals were isolated small, mound-shaped features. These evolved into a barrier reef by the Middle Miocene (∼16 Ma). However, by the Late Miocene (∼10 Ma) this barrier reef backstepped landward, evolved into isolated mounds/atolls and drowned prior to the Miocene-Pliocene boundary (∼6 Ma) largely due regional tectonic subsidence. Early Pliocene reef expansion (∼4.6 Ma) led to the growth of four isolated atolls (the Rowley Shoals) related to local faulting and Early Pliocene warmth. Subsequently a second Pliocene reef growth phase occurred from ∼3.5 to 3 Ma when eastern Indian Ocean sea surface temperatures cooled by ∼4 °C due to Indonesian Gateway constriction and a reduced Leeuwin Current. By the Pleistocene (∼2.4 Ma) one the four Rowley Shoals had drowned. Strong sea level variability, together with Indonesian Throughflow constriction and reduction in intensity of the Leeuwin Current after 2.4 Ma may have led to enhanced cooling and regional upwelling. These factors may have been sufficient to cause local drowning of the southerly fourth Rowley Shoal while the more northerly three Shoals survived until present.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"245 ","pages":"Article 104688"},"PeriodicalIF":4.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142905669","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":"Combined impacts of land change and climate variability on ecosystem net primary productivity in arid regions","authors":"Emeka Edwin Igboeli ,&nbsp;Ogbue Chukwuka ,&nbsp;Friday Uchenna Ochege ,&nbsp;Chukwuemeka Anthony Onyekwelu ,&nbsp;Qing Ling ,&nbsp;Chukwuedozie Ajaero ,&nbsp;Rafiq Hamdi ,&nbsp;Mijanur Rahman ,&nbsp;Alphonse Kayiranga ,&nbsp;Geping Luo","doi":"10.1016/j.gloplacha.2024.104682","DOIUrl":"10.1016/j.gloplacha.2024.104682","url":null,"abstract":"<div><div>Net Primary Productivity (NPP) is an index for assessing ecosystem services and productivity on land. However, previous studies focused solely on NPP changes across ecological regions, overlooking the comparative advantage of the impacts of land changes and climatic variations on various forms of NPP as indicators of ecosystem degradation and restoration across different eco-political milieux. This study comparatively analyzed land cover changes and examined NPP trends and their effects using Mann-Kendall Theil-Sen slopes, the Pearson correlation, and advanced geostatistical methods in the Lake Chad Basin (LCB) and the Aral Sea Basin (ASB). We found that from 2000 to the present and projected to 2030, cropland is expected to expand by 2.20 %, leading to a reduction of shrubland by −2.40 % in LCB. Likewise, a probable increase of 1.1 % in grassland is expected to further reduce waterbodies in ASB by −1.5 %. These potential changes are the resultant effect of the present human-induced NPP (HNPP) reduction of −5.92gC/m²/yr across 2.44 × 10³ km² and 29.84gC/m²/yr across 14.32× 10³ km², indicating human-dominated degradation (HDD) in LCB. Whereas, in ASB, the influence of HNPP by −8.12 gC/m²/yr across 14.32 × 10³ km² and by 4.00gC/m²/yr across 7.24× 10³ km² indicate incipient human-dominated restoration scenarios. Consequent to the warming temperature, climate fluctuations are characterized by HDD in LCB, whereas in ASB, they are characterized by climate-induced degradation. Apprehending these evolving dynamics in endorheic lakes can provide insight into potential restoration trajectories for future land degradations.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"245 ","pages":"Article 104682"},"PeriodicalIF":4.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142884640","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 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}