IF 3 3区地球科学

Marine Chemistry Pub Date : 2025-07-01 DOI: 10.1016/j.marchem.2025.104533

Qixian Chen , Yifan Li , Chen-Tung Arthur Chen , Zong-Pei Jiang , Wei-Jun Cai , Hongwen Pan , Yunwen Shen , Zesheng Ding , Yanan Di , Chenba Zhu , Nianzhi Jiao , Yiwen Pan

{"title":"Diatom-induced calcification in coastal marine environments: Biomineralization threshold and mechanism","authors":"Qixian Chen , Yifan Li , Chen-Tung Arthur Chen , Zong-Pei Jiang , Wei-Jun Cai , Hongwen Pan , Yunwen Shen , Zesheng Ding , Yanan Di , Chenba Zhu , Nianzhi Jiao , Yiwen Pan","doi":"10.1016/j.marchem.2025.104533","DOIUrl":"10.1016/j.marchem.2025.104533","url":null,"abstract":"<div><div>Diatoms play a pivotal role in the ocean, contributing approximately 40 % of marine primary production, with nearly half of the particulate organic carbon being exported. The recent discovery of a novel diatom-induced calcification pathway has attracted significant attention due to its implications for marine carbon, calcium, and silicon cycling. Despite its potential, the lack of a quantitative initiation threshold and comparative analysis with known calcifying organisms limit our ability to predict its ecological impact, particularly on carbon sequestration. This study addresses these gaps by cultivating the common diatom species, Skeletonema costatum, under simulated marine conditions to evaluate its CaCO3 precipitation potential and define the biogeochemical threshold for calcification. The experimental results showed that S. costatum can induce calcification across a range of environmental conditions, including varying dissolved inorganic carbon (DIC 1837 to 2709 μmol·kg−1), nitrogen sources (NH4+ or NO3−), and cell densities (104 to 105 cells·mL−1). Calcification was initiated when the aragonite saturation state (Ωarag) exceeded ∼8. The calcification rate exhibits a linear correlation with Ωarag in the bulk solution, categorizing it as a “biologically induced” process. Our findings highlight similarities between the calcification mechanisms of S. costatum and other calcifying organisms, revealing the common ality of environmental drivers. This study advances our understanding of diatom-induced calcification, offering insights into its role in the marine carbon cycle and potential contributions to carbon sequestration strategies.</div></div>","PeriodicalId":18219,"journal":{"name":"Marine Chemistry","volume":"271 ","pages":"Article 104533"},"PeriodicalIF":3.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144524021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Impact of the East Asian Stratospheric Intrusion on Lower Tropospheric Ozone in the Yangtze River Delta 东亚平流层入侵对长江三角洲对流层下层臭氧的影响

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-07-01 DOI: 10.1029/2024JD042349

Jinpeng Lu, Xin Huang, Xueyu Zhou, Lijie Yang, Sijia Lou, Zilin Wang, Jiawei Xu, Aijun Ding

{"title":"Impact of the East Asian Stratospheric Intrusion on Lower Tropospheric Ozone in the Yangtze River Delta","authors":"Jinpeng Lu, Xin Huang, Xueyu Zhou, Lijie Yang, Sijia Lou, Zilin Wang, Jiawei Xu, Aijun Ding","doi":"10.1029/2024JD042349","DOIUrl":"https://doi.org/10.1029/2024JD042349","url":null,"abstract":"Tropospheric ozone (O3) pollution has aroused increasing attention in past decades, especially in China, with escalating near-surface O3 levels. Apart from photochemical reactions, stratospheric intrusion (SI) also contributes to tropospheric O3 pollution. In this study, a strong SI event that greatly influenced the near-surface O3 pollution was identified in May 2023. To quantitatively analyze the contribution to surface O3 over the Yangtze River Delta (YRD), meteorological reanalysis data, in situ observations, and a regional meteorology-chemistry coupled model were integrated. Our findings reveal that the severe O3 pollution observed over the YRD region cannot be solely attributed to photochemical processes. Noteworthily, a distinct signal of stratospheric air masses injecting into the troposphere was observed, indicating a more complex interplay between atmospheric chemical and physical processes. The clustering analysis of the backward trajectories shows that the O3-rich air masses injected into the lower troposphere are primarily driven by westerly jets and downwelling behind the troughs accompanying the low-pressure weather system at 46°N–60°N. The stratospheric O3-rich air masses can be transported to the YRD region driven by the strong downwelling occurring with a high-altitude wind field toward the south. Using the regional meteorology-chemistry model Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) with real-time input of the upper chemical boundary conditions, it is estimated that such regionally transported SI O3 contributed more than 12 ppb to surface O3 pollution over the YRD region.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 13","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144524496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Co-drivers of air pollutant and CO2 emissions in China from 2000 to 2020 2000 - 2020年中国大气污染物和CO2排放的共同驱动因素

IF 9 1区地球科学

npj Climate and Atmospheric Science Pub Date : 2025-07-01 DOI: 10.1038/s41612-025-01124-7

Wenxin Cao, Yixuan Zheng, Shaohui Zhang, Zbigniew Klimont, Xian’en Wang, Fangming Jiang, Zhulin Qi, Chuchu Chen, Yueyi Feng, Zechen Zhang, Hongkuan Zang, Yu Lei, Gang Yan

{"title":"Co-drivers of air pollutant and CO2 emissions in China from 2000 to 2020","authors":"Wenxin Cao, Yixuan Zheng, Shaohui Zhang, Zbigniew Klimont, Xian’en Wang, Fangming Jiang, Zhulin Qi, Chuchu Chen, Yueyi Feng, Zechen Zhang, Hongkuan Zang, Yu Lei, Gang Yan","doi":"10.1038/s41612-025-01124-7","DOIUrl":"https://doi.org/10.1038/s41612-025-01124-7","url":null,"abstract":"Revealing how historical energy and environmental policies interacted with socioeconomic factors to shape the trends in air pollutant and CO2 emissions is crucial for developing effective future pollution-carbon co-control strategies. Here, we develop an integrated analytical framework combining a detailed sectoral emission inventory, index decomposition analysis, and a clustering algorithm to investigate China’s synergetic patterns of air pollutant and CO2 emissions across 15 socioeconomic sectors from 2000 to 2020 and uncover the co-drivers behind these trends, with detailed temporal, sectoral, and spatial dynamics revealed. Our analysis suggests that historical policies have effectively curbed air pollutant emissions, while abating CO2 emissions remains a challenge. Energy and climate policies, particularly those focused on structural adjustments, are increasingly instrumental in driving pollution-carbon co-reduction. Compared to the earlier period, the fractional contribution of energy and climate policies to emission reductions of SO2, NOx, PM2.5, and CO2 increased by 1.3-8.6 times during 2010-2020, respectively. Substantial regional heterogeneity in emission co-drivers underscores the need for tailored strategies, such as adopting advanced energy-saving technologies in areas dominated by energy-intensive industries and accelerating the clean energy transition in regions endowed with renewable resources. Our study would provide actionable insights for formulating effective pollution-carbon co-control strategies in China and beyond.","PeriodicalId":19438,"journal":{"name":"npj Climate and Atmospheric Science","volume":"26 1","pages":""},"PeriodicalIF":9.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144534027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Early Paleozoic Bimodal Magmatism Documents the Transition from Collisional to Extensional Tectonics within the Central Himalaya 早古生代双峰岩浆作用记录了喜马拉雅中部由碰撞构造向伸展构造的转变

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-06-30 DOI: 10.1111/1755-6724.15300

Zhiqiang YIN, Longqiang LIU, Xiaochun LÜ, Nan LI, Lidong ZHU, Qiang LIU, Erjia HA

{"title":"Early Paleozoic Bimodal Magmatism Documents the Transition from Collisional to Extensional Tectonics within the Central Himalaya","authors":"Zhiqiang YIN, Longqiang LIU, Xiaochun LÜ, Nan LI, Lidong ZHU, Qiang LIU, Erjia HA","doi":"10.1111/1755-6724.15300","DOIUrl":"https://doi.org/10.1111/1755-6724.15300","url":null,"abstract":"The tectonic setting of the Himalaya during the Early Paleozoic has been a subject of enduring debate within the scientific community. Newly discovered bimodal intrusive rocks from comprehensive field geological investigation in the central mountain range were subjected to petrology, zircon U-Pb geochronology, zircon Hf isotopes and whole-rock geochemistry analyses. The Palie bimodal intrusive rocks, comprising amphibolite and granitic gneiss, were formed at ∼489 Ma. The amphibolite exhibits geochemical characteristics consistent with N-MORB, while the granitic gneiss is classified as high potassium calc-alkaline peraluminous S-type granite. Both igneous rocks exhibit negative zircon εHf(t) values and display ancient TDMC ages. In conjunction with regional geological survey findings, it can be inferred that the formation of the Palie bimodal intrusive rocks occurred within a post-collision extensional tectonic setting. The amphibolite genesis involved partial melting of an enriched lithospheric mantle with some crustal assimilation, whereas the origin of the granitic gneiss can be attributed to partial melting of pre-existing felsic crust. Our data indicate that during the Early Paleozoic, the Himalaya underwent a transition from a pan-African collisional setting to post-collisional extensional tectonics.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 3","pages":"679-692"},"PeriodicalIF":3.5,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Advantage of Diurnal Amplitude Variation (DAV) of Brightness Temperature in Revealing the Land-Atmosphere Interaction Over the Region of Frozen and Thawed Soil in the Northern Hemisphere During the Cold Wave Movements 亮度温度日振幅变化（DAV）在揭示寒潮运动期间北半球冻土区陆地-大气相互作用中的优势

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-06-30 DOI: 10.1029/2024GL114485

Yin Hu, Shaoning Lv, Yuanyuan Guo, Haihua Bai, Altanchimeg Dorjsuren, Yijun Zhang, Jun Wen

{"title":"Advantage of Diurnal Amplitude Variation (DAV) of Brightness Temperature in Revealing the Land-Atmosphere Interaction Over the Region of Frozen and Thawed Soil in the Northern Hemisphere During the Cold Wave Movements","authors":"Yin Hu, Shaoning Lv, Yuanyuan Guo, Haihua Bai, Altanchimeg Dorjsuren, Yijun Zhang, Jun Wen","doi":"10.1029/2024GL114485","DOIUrl":"https://doi.org/10.1029/2024GL114485","url":null,"abstract":"During cold wave movements, land-atmosphere interaction functions as a “switch” mechanism, regulating energy and moisture exchange. However, existing methods have limitations in capturing this process. The dielectric contrast between frozen and thawed soil induces diurnal amplitude variation (DAV) in brightness temperature at L-band, providing a basis for tracking land-atmosphere interactions. Our study shows that DAV effectively captures cold air masses' origin and seasonal movement. During a cold wave, its phase relationship with air and soil temperatures falls into four categories: precedes (−1.1 to −0.6 days), lags (0.71–0.98 days), in between (−0.62 to 0.34 days), and synchronized. Moreover, DAV lags air temperature in 63% of cases and precedes soil temperature in 59%, consistently fluctuating within their overlap region. This suggests DAV is a more direct indicator of freeze–thaw, reflecting the conditions at the atmosphere–land interface.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 13","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL114485","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Toward Solving the Mystery of Elevated Tectonic Degassing in South Eastern Europe: Insights From Gas Discharges Along the Vardar Suture (North Macedonia) 解开东南欧高架构造脱气之谜：北马其顿瓦尔达尔缝合带天然气排放的启示

IF 2.9 2区地球科学

Geochemistry Geophysics Geosystems Pub Date : 2025-06-30 DOI: 10.1029/2025GC012177

L. Li Vigni, M. Temovski, C. Cardellini, K. Molnár, A. Ionescu, V. Mirčovski, K. Daskalopoulou, G. Chiodini, F. Parello, W. D’Alessandro

{"title":"Toward Solving the Mystery of Elevated Tectonic Degassing in South Eastern Europe: Insights From Gas Discharges Along the Vardar Suture (North Macedonia)","authors":"L. Li Vigni, M. Temovski, C. Cardellini, K. Molnár, A. Ionescu, V. Mirčovski, K. Daskalopoulou, G. Chiodini, F. Parello, W. D’Alessandro","doi":"10.1029/2025GC012177","DOIUrl":"https://doi.org/10.1029/2025GC012177","url":null,"abstract":"Tectonic carbon degassing is an important contributor to the global carbon cycle. South Eastern Europe is an active extensional tectonic region. This is the result of intense geodynamic events related to the closure of the Tethys Ocean, whose remnants include an ophiolite orogenic belt and the Vardar megasuture. In North Macedonia, regional active fault systems, seismic activity, Cenozoic-Quaternary volcanism, large-scale degassing, and low-enthalpy geothermal resources are widespread. Nonetheless, a geochemical characterization of the gas manifestations is missing from the literature. Toward this contribution, we report the first characterization of chemical and isotopic compositions of fluids from the main geothermal and cold gas manifestations of North Macedonia, and we explore their origins, the processes controlling their chemistry, and their relationships with the regional geodynamic situation. Gas samples were collected along the whole country, and were analyzed for both their chemical (He, H2, H2S, O2, N2, CO2, CH4, Ar) and isotopic composition (δ13C-CO2, He, Ar). Based on their chemistry, samples can be subdivided into three groups: (a) N2-dominated, (b) CO2-dominated, and (c) H2S-rich, which are geographically well separated, following regional distributions. The CO2-dominated group is the most widespread, highlighting the importance of geogenic carbon degassing in the study area. Its origin is prevailingly crustal (δ13C-CO2 = −4.6–+1.0‰ vs. V-PDB; R/RA = 0.1–1.8), but a significant, up to 25%, mantle contribution can be inferred from the He isotope composition.","PeriodicalId":50422,"journal":{"name":"Geochemistry Geophysics Geosystems","volume":"26 7","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GC012177","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unzipping of the Conjugate Fault System During the 2024 Mw7.4 Hualien Earthquake 2024年花莲7.4级地震共轭断层系统的解压缩

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-06-30 DOI: 10.1029/2025GL115218

Liuwei Xu, Lingsen Meng, Wenbin Xu, Yen-Yu Lin, Jianghui Geng, Saeed Mohanna, Grant Kawamoto

{"title":"Unzipping of the Conjugate Fault System During the 2024 Mw7.4 Hualien Earthquake","authors":"Liuwei Xu, Lingsen Meng, Wenbin Xu, Yen-Yu Lin, Jianghui Geng, Saeed Mohanna, Grant Kawamoto","doi":"10.1029/2025GL115218","DOIUrl":"https://doi.org/10.1029/2025GL115218","url":null,"abstract":"On 2 April 2024, a Mw7.4 earthquake struck Taiwan's eastern coast near Hualien City. The fault responsible for the mainshock remained under debate due to the region's complex plate boundary system and intricate fault interactions. To determine the fault plane and resolve the rupture process, we analyzed local and teleseismic waveform recordings, along with near-field and satellite geodetic data. We employed Slowness-Enhanced Back-Projection and Finite Fault Inversion techniques across seismic and geodetic data sets. Our analysis revealed that the rupture propagated on the east-dipping Longitudinal Valley Fault (LVF) and its west-dipping conjugate fault. The rupture started on the LVF and reached the conjugate fault at ∼8 s, after which slip occurred simultaneously on both faults. The aftershock distribution validated the fault geometry. The 2024 mainshock demonstrated the seismic potential of the LVF and its role in accommodating the thrust component of strain accumulation from the plate collision near Hualien.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 13","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL115218","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lithostratigraphy and Microfacies Analysis of the Govanda Formation (Early–Middle Miocene) in the Sherwan Mazin Area, Kurdistan Region, NE Iraq 伊拉克东北部库尔德斯坦地区Sherwan Mazin地区古旺达组（早-中中新世）岩石地层及微相分析

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-06-30 DOI: 10.1111/1755-6724.15314

Arkan O. SHARAZWRI, Bzhar A. DELIZY

{"title":"Lithostratigraphy and Microfacies Analysis of the Govanda Formation (Early–Middle Miocene) in the Sherwan Mazin Area, Kurdistan Region, NE Iraq","authors":"Arkan O. SHARAZWRI, Bzhar A. DELIZY","doi":"10.1111/1755-6724.15314","DOIUrl":"https://doi.org/10.1111/1755-6724.15314","url":null,"abstract":"The Govanda Formation was deposited during the Miocene in the intermontane areas between the Zagros suture and imbricate zones. The Govanda Formation was studied in the Sherwan Mazin area within Mergasor district, Erbil Governorate to identify the lithostratigraphy and microfacies analysis in order to determine the depositional environment of the formation. The formation in the studied section is 116 m thick and mainly consists of reddish-brown, hard, thick-bedded, chert-bearing conglomerate, pinkish shale and yellowish-grey, thick-bedded, detrital, fossiliferous limestone. The formation is unconformably underlain by the Upper Cretaceous Tanjero Formation and conformably overlain by the Merga Red Beds series. Four different lithostratigraphic units were identified, based on field observation and petrographic analysis, including a basal conglomerate unit (A), a shale unit (B), a well-bedded limestone unit (C) and a thick and massively-bedded limestone unit (D). The presence of a thick conglomerate bed at the base of the formation indicates a large unconformity that lasted nearly 40 million years. Based on detailed microfacies analysis of carbonate rocks, five main microfacies and 15 submicrofacies are recognized. The main microfacies types include mudstone, wackestone, packstone, grainstone and boundstone microfacies. Based on the microfacies types the depositional environment are defined as open lagoon, reef, fore-reef and back-reef environments of normal to saline, nutrient rich water.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 3","pages":"667-678"},"PeriodicalIF":3.5,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Increased Socioeconomic Impacts With Future Intensifying Flash Droughts in China 未来中国突发性干旱加剧，社会经济影响加大

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-06-30 DOI: 10.1029/2025GL116454

Yuchen Li, Yuyue Xu, Jiangling Liao, Junzheng Pi, Wenfeng Zhan, Jianli Chen, Ling Yao, Chenghu Zhou

{"title":"Increased Socioeconomic Impacts With Future Intensifying Flash Droughts in China","authors":"Yuchen Li, Yuyue Xu, Jiangling Liao, Junzheng Pi, Wenfeng Zhan, Jianli Chen, Ling Yao, Chenghu Zhou","doi":"10.1029/2025GL116454","DOIUrl":"https://doi.org/10.1029/2025GL116454","url":null,"abstract":"Amid global warming and rapid urbanization, China faces the challenge of an increasing frequency and severity of flash droughts. However, the impact of flash droughts on the socioeconomic conditions has not been sufficiently explored. Here, we elucidate the evolutionary characteristics of flash droughts in China and project future trends in their impacts on socioeconomic conditions under different climate scenarios by analyzing soil moisture and socioeconomic data. We estimate that the frequency of flash droughts is projected to increase in specific regions of China, along with an increasingly substantial socioeconomic impact over time. Under SSP2-4.5, the population and gross domestic product exposed to flash droughts are anticipated to reach 33% and 35% by the end of this century, respectively. Furthermore, richer subgroups face higher economic risks and greater social vulnerability. These findings may help policymakers assess the adverse effects of flash droughts and formulate policies to mitigate the threats to sustainability.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 13","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL116454","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Prairie stream nutrient stoichiometry across space and time: Influence of discharge, season, and crop type 跨时空的草原河流养分化学计量：流量、季节和作物类型的影响

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2025-06-30 DOI: 10.1002/lno.70117

Amy B. White, Robert B. Brua, Kristin J. Painter, Helen P. Jarvie, Adam G. Yates

{"title":"Prairie stream nutrient stoichiometry across space and time: Influence of discharge, season, and crop type","authors":"Amy B. White, Robert B. Brua, Kristin J. Painter, Helen P. Jarvie, Adam G. Yates","doi":"10.1002/lno.70117","DOIUrl":"https://doi.org/10.1002/lno.70117","url":null,"abstract":"Stream water nutrient ratios are often influenced by flow variation and landscape characteristics. However, the influence of these drivers on total and dissolved nutrient ratios remains understudied, especially in prairie ecosystems where hydrologic connectivity between soils and streams exhibits substantial spatial and seasonal variability. Here, we ask how hydrology and land cover drive patterns of nitrogen (N), phosphorus (P), and N : P ratios across streams and rivers draining northern prairie ecosystems. To answer this, we compiled nutrient concentration data for tributaries of the Red River, Manitoba, Canada, to assess seasonal and annual variation in nutrient ratios, as well as the relationship between crop cover, discharge, and ratios, over 1‐yr, 10‐yr, and 30‐yr time spans. Total nitrogen : total phosphorus ratios were near the Redfield mass ratio (N/P = 7.23) across 24 streams in the Red River Valley. By comparison, dissolved inorganic nitrogen : total dissolved phosphorus ratios in these streams were N depleted and generally declined from spring through to autumn. The types of crops grown did not appear to be a consistent influence on nutrient ratios in streams throughout the region. In contrast, stream flows strongly influenced spring and summer nutrient ratios in four tributaries over a 30‐yr period. Specifically, increasing stream flow tended to decrease TN : TP and DIN : TDP in the two eastern tributaries but increase DIN : TDP in the western tributaries. Our findings that nutrient ratios in prairie streams are impacted by seasonality and fluctuating hydrologic conditions suggest that nutrient ratios in Red River tributaries may be impacted by future climate change.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"30 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144520501","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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