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The importance of porewater exchange process on carbon lateral export from saltmarsh creek to coastal sea

Journal of Oceanology and Limnology 2025年第1期43卷 90-102页

作者： Jian’an LIU Xueqing YU Xinyi LIN Tong PENG Liming XUE Jinzhou DU State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 200241China State Key Laboratory of Marine Resource Utilization in South China sea Hainan UniversityHaikou 570228China

Saltmarsh is one of the blue carbon ecosystems for the highest carbon burial ***,the buried carbon in saltmarsh may still be exported to coastal water through porewater exchange,a process that has often been overlooked in previous studies.A typical tidal creek of the Dongtan saltmarsh wetland in Chongming Island,Shanghai,China,was ***224Ra and223Ra activities were measured and the hydrological parameters such as water flow were determined,from which the porewater exchange rate in the tidal creek was estimated to be 1.78±1.73 cm/***,the carbon concentrations in porewater were determined,based on which the fluxes of dissolved inorganic carbon(DIC),dissolved organic carbon(DOC),CH_(4),and CO_(2)exported from porewater exchange were derived to be 60±17,6.6±4.0,0.082±0.079,and 16±11 mmol/(m^(2)·d),*** addition,analysis on different species of carbon in the creek water showed that,the fluxes of DIC,DOC,CH_(4),and CO_(2)exported laterally from tidal creek to coastal sea were 58±14,7.6±2.3,0.0011±0.00063,and 1.5±0.68 mmol/(m^(2)·d),respectively,indicating that the porewater exchange-derived carbon fluxes accounted for a large portion of the lateral carbon outwelling,and even much higher than those in CH_(4)and CO_(2)***,the carbon exported from porewater exchange accounted for 50%of the carbon burial in the tidal creek system,of which DIC accounted for 73%of the total carbon flux transported by porewater ***,this study indicated that the porewater exchange-derived carbon fluxes to the tidal creek water may cause an overestimation in the carbon sequestration capacity of saltmarsh wetlands,and revealed the importance of porewater exchange for the carbon cycle of tidal creek system of saltmarsh wetlands.

关键词： coastal saltmarsh porewater exchange radium blue carbon tidal creek carbon lateral outwelling

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Ensemble-Based Adaptive Observations for Improving sea Fog Prediction in Coastal Regions around the Bohai sea:Case Study with Cold-Front Synoptic Pattern

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Advances in Atmospheric Sciences 2025年第4期42卷 794-815页

作者： Huiqin HU Chengqing RUAN Xiaolin YU Qingdao University of Science and Technology Qingdao 266061China North China sea Marine Forecasting Center of State Oceanic Administration Qingdao 266033China Ocean University of China Qingdao 266100China

This study explored the observation strategy and effectiveness of synoptic-scale adaptive observations for improving sea fog prediction in coastal regions around the Bohai sea based on a poorly predicted fog event with cold-front synoptic pattern(CFSP).An ensemble Kalman filter data assimilation system for the Weather Research and Forecasting model was adopted with ensemble sensitivity analysis(ESA).By comparing observation impacts(estimated from a 40-member ensemble with ESA)among different meteorological observation variables and pressure levels,the temperature at 850 hPa and surface layer(850 hPa-and-surface temperature)was selected as the target observation ***,the area with large observation impacts for this observation type was predicted in the transition region of the surface low–high *** area developed southward with the low and moved eastward with the low–high system,which could be explained by the main features of ***,both experiments assimilating synthetic and real observations showed that assimilating 850 hPa-and-surface temperature observations generally yielded better fog coverage forecasts in areas with greater observation impacts than areas with smaller ***,the effectiveness of adaptive observations was reduced when real observations rather than synthetic observations were assimilated,which is possibly due to factors such as observation and model *** main conclusions above were verified by another typical fog event with CFSP *** of this study highlight the importance of improved initial conditions in the transition region of the low–high system for improving fog prediction and provide scientific guidance for implementing an observation network for fog forecasting over the Bohai sea.

关键词： sea fog forecasting synoptic-scale adaptive observations ESA method observations of temperature profile below 850 hPa cold-front synoptic pattern

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Checklist of marine fishes in the Beibu Gulf:fish classification,resource protection,and biodiversity challenge

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Journal of Oceanology and Limnology 2025年第1期43卷 232-247页

作者： Zhisen LUO Murong YI Xiaodong YANG Xiao CHEN Jinxi WANG Changping JIANG Fengming LIU Konglan LUO Xiongbo HE Hung-Du LIN Bin KANG Yunrong YAN College of Fisheries Guangdong Ocean UniversityZhanjiang 524088China College of Marine Sciences South China Agricultural UniversityGuangzhou 510642China Fisheries College Ocean University of ChinaQingdao 266003China Guangdong Provincial Engineering and Technology Research Center of Far sea Fisheries Management and Fishing of South China sea Guangdong Ocean UniversityZhanjiang 524088China

Marine fish diversity in the Beibu Gulf from 2014 to 2022 was analyzed,using various methods including at-sea fisheries resource surveys,fishing port surveys,underwater survey techniques,and data from literature,books,and databases,from which 1059 fish species across 40 orders,166 families,and 503 genera were *** them,Acanthuriformes displayed the highest diversity,followed by Carangiformes and ***,eight alien species were found in the Beibu *** International Union for Conservation of Nature(IUCN)Red List assessment revealed 51threatened species,primarily cartilaginous *** changes affected 88.70%of species due to classification adjustments,misidentifications,and junior *** study contributed new data of the gulf,including one additional order,six new families,34 new genera,and 81 new species,emphasizing the dynamic nature of marine *** diversity in the gulf was relatively lower than the broader South China sea,attributed to limited habitats and survey *** survey methods,such as gill nets,trap nets,and underwater cameras,yielded varying *** currents may have transported deep-sea species into the Beibu Gulf,leading to accidental *** gaps exist in unexplored areas,warranting further ***,the Beibu Gulf hosts significant marine biodiversity,but taxonomic challenges and undiscovered species require new research and conservation efforts.

关键词： northwestern South China sea new record taxonomic change fish diversity survey method

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Effect of preprocessing on performances of machine learning-based mineral composition analysis on gas hydrate sediments, Ulleung Basin, East sea

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Petroleum Science 2025年第1期22卷 151-162页

作者： Hongkeun Jin Ju Young Park Sun Young Park Byeong-Kook Son Baehyun Min Kyungbook Lee Department of Geoenvironmental Sciences Kongju National University Tunnel & Underground Facility Division ESCO Consultant & Engineers Company Yellow sea Institute of Geoenvironmental Sciences Petroleum and Marine Research Division Korea Institute of Geoscience and Mineral Resources Department of Climate and Energy Systems Engineering Ewha Womans University Center for Climate/Environment Change Prediction Research Ewha Womans University

Gas hydrate(GH) is an unconventional resource estimated at 1000-120,000 trillion *** on GH is ongoing to determine its geological and flow characteristics for commercial production. After two large-scale drilling expeditions to study the GH-bearing zone in the Ulleung Basin, the mineral composition of 488 sediment samples was analyzed using X-ray diffraction(XRD). Because the analysis is costly and dependent on experts, a machine learning model was developed to predict the mineral composition using XRD intensity profiles as input data. However, the model's performance was limited because of improper preprocessing of the intensity profile. Because preprocessing was applied to each feature, the intensity trend was not preserved even though this factor is the most important when analyzing mineral composition. In this study, the profile was preprocessed for each sample using minmax scaling because relative intensity is critical for mineral analysis. For 49 test data among the 488data, the convolutional neural network(CNN) model improved the average absolute error and coefficient of determination by 41% and 46%, respectively, than those of CNN model with feature-based preprocessing. This study confirms that combining preprocessing for each sample with CNN is the most efficient approach for analyzing XRD data. The developed model can be used for the compositional analysis of sediment samples from the Ulleung Basin and the Korea Plateau. In addition, the overall procedure can be applied to any XRD data of sediments worldwide.

关键词： Sample-based preprocessing X-ray diffraction (XRD) Machine learning Mineral composition Gas hydrate (GH) Ulleung basin

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Complex BSRs and differential gas hydrate accumulations in the northern South China sea

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Journal of Earth Science 2025年

作者： Xiujuan Wang Jiapeng Jin Lixia Li Jinzi Hu Sanzhong Li Wenlu Wang Pibo Su Shengxiong Yang State Key Laboratory of Natural Gas Hydrate(Beijing) Frontiers Science Center for Deep Ocean Multispheres and Earth System， Key Lab of Submarine Geosciences and Prospecting Techniques， MOE and College of Marine Geosciences， Ocean University of China Laboratory for Marine Mineral Resources，Laoshan Laboratory CNOOC Research Institute Co.， Ltd. Sanya Institute of South China sea Geology， Academy of South China sea Geological Science，China Geological Survey Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)

Different types of bottom simulating reflectors (BSRs)， along complex morphologies of gas hydrates， have been revealed in the northern South China sea. They occur in different tectonic-sedimentary settings. Fracture-filling and pore-filling gas hydrates are widely discovered above different types of BSRs by drillings and indicated by chimney-like or high amplitude reflections on seismic profiles. The existence of structure II gas hydrates， the coexistence of gas hydrates and free gas， the recently active gas hydrate systems， and the extensive distributed shallow gas are all due to the supply of thermogenic gas and relatively high flux of fluid migration. The pathways， such as faults， fractures， thrust faults， diapir and gas chimneys， which are formed by magmatism， intrusive structures， overpressure， or compressional tectonic forces， play important roles in vertical fluid migrations， particularly in areas where multi-stages mass transport deposits distributed. The differences in the tectonic-sedimentary settings are suggested to account for the shifts of the BSRs in the northern South China sea. The tectonic activities control the development of fluid migration pathways， and the reservoir plays a crucial role in the accumulation of various types of gas hydrate. A comprehensive understanding of these differences in gas hydrate occurrences and their key geological controls can contribute to the exploration for gas hydrates in the future.

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Phase transition thermosensitive photocatalytic hydrogel for enhanced uranium extraction

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Science Bulletin 2025年第1期70卷 4-6页

作者： Jiacheng Zhang Yihui Yuan Ning Wang State Key Laboratory of Marine Resource Utilization in South China sea Collaborative Innovation Center of Marine Science and TechnologyHainan UniversityHaikou 570228China

As a clean energy source,nuclear energy is crucial for realizing carbon neutralization and the construction of many nuclear plants is underway[1].According to an estimate by the International Atomic Energy Agency,the global nuclear energy production is expected to increase by 56%between 2015 and 2030[2].However,with current consumption rate of uranium resources,terrestrial uranium reserves will be depleted within approximately 80 years[3,4].

关键词： approximate transition hydrogel

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Propagating subduction initiation of the Caroline Plate at the Mussau Trench

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Science China Earth Sciences 2025年第1期68卷 253-269页

作者： Chun-Feng LI Yongkang DENG Tao WU Dongdong DONG Guoliang ZHANG Jiazheng ZHANG Yutao LIU Yaqing LI Fugui TANG Lulu ZHANG Department of Marine Sciences Zhejiang UniversityZhoushan316021China Laboratory of Marine Mineral Resources Laoshan LaboratoryQingdao266237China Key Lab of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao266071China Key Lab of Ocean and Marginal sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou510301China Science&Technology on Integrated Information System Lab Institute of SoftwareChinese Academy of SciencesBeijing100190China

New seismic imaging from the Mussau Trench confirms that,under horizontal compression on an oceanic plate boundary,it is within the young and weak oceanic plate that a trench will develop,and it is the young plate,not so long after its birth,that starts to subduct toward the old *** Mesozoic Pacific Plate cannot easily bend,under the joint horizontal compression and vertical gravity pull,even with a pre-existing weak zone in place and with a large age offset across the plate *** bending of the Caroline Plate near the northern end of the Mussau Trench started only after a long-time span of trench migration,and/or after a prolonged transition from initial compression to trench *** contrasting trench deformation and sedimentary accretion between two parallel seismic sections support an evident migration of underthrusting or significant longitudinal heterogeneity along the *** swift transition from underthrusting to non-thrusting can be explained by a counter-clockwise rotation of the Caroline *** miniature accretionary wedges develop even before the subduction initiates imply strong compression and uplifting before the underthrusting can *** of the Caroline Plate have been halted as the Mussau Trench is seismically rather quiet and the Lyra Trough to the east shows relaxational extension.

关键词： Mussau Trench Subduction initiation Seismic reflection Caroline Plate

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Erratum to “Data from Twenty-Three FRB’s Confirm the Universe Is Static and Not Expanding”, [Journal of High Energy Physics, Gravitation and Cosmology 2024, 10, 1152-1177]

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Journal of High Energy Physics, Gravitation and Cosmology 2025年第1期11卷 165-167页

作者： Lyndon Errol Ashmore Independent Researcher Southend-on-Sea England

Dispersion measure in an FRB’s signal is produced by the photons of the radio waves interacting with the free electrons in the IGM. In New Tired Light (NTL), redshifts are produced by the photons of light interacting with these self-same electrons and so, one would expect a direct relationship between the DM of an FRB and the redshift of the host galaxy. However, workers in this field assume expansion and weight the DM by dividing it by the scale factor (1 + z) to allow for expansion. Once this weighting is removed, it was predicted back in 2016 (when the first FRB was localized) and later presented at a conference and published in the proceedings that, as more FRB’s were localized, a graph of DM versus ln(1 + z) would be a straight line of gradient (mec/2hre) or 7.32 × 1025 m−2 in SI units. The original paper had twenty-four data points but this has risen significantly to sixty-four useable FRB’s and so this corrigendum updates that paper so that all sixty-four are used. The data give a straight-line graph of gradient 7.12 × 1025 m−2, a difference of 3% from (mec/2hre) predicted nine years earlier.

关键词： Redshift Dispersion Measure Fast Radio Bursts FRB’s Tired Light Static Universe IGM

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Hyperosmolality tolerance of freshwater largemouth bass Micropterus salmoides to brackish in early ontogenetic stages of eggs,embryos,and yolk-sac larvae

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Journal of Oceanology and Limnology 2025年第1期43卷 286-298页

作者： Du LUO Dingtian YANG South China sea Institute of Oceanology Chinese Academy of SciencesGuangzhou 510301China Pearl River Fisheries Research Institute Chinese Academy of Fishery SciencesGuangzhou 510380China University of Chinese Academy of Sciences Beijing 100049China

Salinity is recognized as a pivotal factor limiting the migration of freshwater fish to brackish *** largemouth bass(LMB,Micropterus salmoides),a globally translocated freshwater fish,exhibits estuarine distribution,yet its hyperosmoregulatory capacity during early ontogenetic stages remains inadequately *** investigate the impact of freshwater salinization,a series of experiments were conducted in Guangzhou and Foshan,*** reveal that freshwater-activated mature eggs and naturally fertilized oocytes maintained nearly identical osmotic homeostasis,with diameters of 1.38±0.07 mm and 1.37±0.05 mm,***,both exhibited peak water excretion at a salinity of ***,a reduction in water permeability was observed in hyperosmotic *** hatching rates increased from 27.5%±14.4%in the 1.0 group to 75.1%±12.0%in the 6.0 group under fluctuating temperature ***-sac LMB larvae consistently reduced survival time from 12.5 d at 1.0 to 50.7±2.1 min at salinity of ***,more developed larvae also experienced a decrease in survival *** regression models fitting lethal time with salinity indicated a sharp decrease between 10.0 and *** findings offer practical insights for predicting distribution patterns and enhancing aquaculture technology for ***,they may contribute theoretically to the broader understanding of the osmoregulatory mechanisms of freshwater fish.

关键词： osmotic homeostasis acute toxicity median lethal time hatching rate dose-response model

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An efficient and accurate numerical method for simulating close-range blast loads of cylindrical charges based on neural network

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Defence Technology(防务技术) 2025年第2期44卷 257-271页

作者： Ting Liu Changhai Chen Han Li Yaowen Yu Yuansheng Cheng School of Naval Architecture and Ocean Engineering Huazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics Wuhan 430074China Collaborative Innovation Center for Advanced Ship and Deep-sea Exploration Shanghai 200240China

To address the problems of low accuracy by the CONWEP model and poor efficiency by the Coupled Eulerian-Lagrangian(CEL)method in predicting close-range air blast loads of cylindrical charges,a neural network-based simulation(NNS)method with higher accuracy and better efficiency was *** NNS method consisted of three main ***,the parameters of blast loads,including the peak pressures and impulses of cylindrical charges with different aspect ratios(L/D)at different stand-off distances and incident angles were obtained by two-dimensional numerical ***,incident shape factors of cylindrical charges with arbitrary aspect ratios were predicted by a neural ***,reflected shape factors were derived and implemented into the subroutine of the ABAQUS code to modify the CONWEP model,including modifications of impulse and *** reliability of the proposed NNS method was verified by related experimental *** accuracy improvement was acquired by the proposed NNS method compared with the unmodified CONWEP ***,huge efficiency superiority was obtained by the proposed NNS method compared with the CEL *** proposed NNS method showed good accuracy when the scaled distance was greater than 0.2 m/kg^(1/3).It should be noted that there is no need to generate a new dataset again since the blast loads satisfy the similarity law,and the proposed NNS method can be directly used to simulate the blast loads generated by different cylindrical *** proposed NNS method with high efficiency and accuracy can be used as an effective method to analyze the dynamic response of structures under blast loads,and it has significant application prospects in designing protective structures.

关键词： Close-range air blast load Cylindrical charge Numerical method Neural network CEL method CONWEP model

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