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  • This study was conducted to explore the contribution of silicon dissolution from beach sediments to the dissolved silicon budget in the coastal waters. From March to September in 2017, six field surveying cruises were conducted in the Muping offshore area (Yantai, China), the southern North Yellow Sea. By investigating monthly distributions and the averaged values of dissolved inorganic nutrients, monthly accumulation of dissolved silicate anomaly (ΔSi, as defined with the difference between dissolved inorganic nitrogen and silicate concentrations)of 1.5 μmol·L-1 was observed in this offshore area with weak circulation from May to August. Further combining laboratory incubation experiments, theoretical calculation and field data analyses, It was found that the permeable particles in beaches could be dissolved, leaching active silicate to seawater, and increasing the offshore silicate concentration by 0.7~2.0 μmol·L-1 every month, roughly consistent with the monthly accumulation rate of field ΔSi. Extrapolating the beach silicate-leaching flux to the length of the coastline rounding the Yellow Sea, the previously reported imbalance in silicate budget in this coastal sea could roughly be bridged. This study indicated again that the dissolving of permeable particles might contribute significantly to coastal silicate budget.

  • Tidal flats are influenced by tides, experiencing periodic inundation and exposure, thus the inundation frequency reflects the elevation of tidal flats. This study utilizes time-series SAR satellite remote sensing data to conduct research on the remote sensing inversion method of tidal flat topography based on tidal level complementary cumulative distribution function. The key lies in proposing a new method for inundation frequency correction based on the weighting scale of remote sensing observation counts. And, based on the mathematical definition of inundation frequency, the functional relationship between inundation frequency and tidal flat elevation was explored, leading to the construction of a tidal flat topography inversion model based on the tidal level complementary cumulative distribution function. Then, the validation of the method was conducted in the Yueqing Bay. Based on the time-series Sentinel-1 satellite SAR remote sensing data, the tidal flat topographies for the periods 2019-2020 and 2021-2022 were successfully inverted. The accuracy assessment was conducted based on the corresponding period’s ICESat-2 satellite laser altimetry data. The root mean square errors (RMSE)of the tidal flat topographies for the periods 2019-2020 and 2021-2022 were 0.41 m and 0.51 m, respectively. Additionally, the RMSE of topography for the period of 2019-2020 using in-situ data was 0.48 m. The accuracy assessment suggest that the proposed method in this study can achieve high-precision tidal flat topography without field-measured topographic data. It is expected to be applicable to the monitoring of tidal flat topography in more regions.

  • Island ecosystems are characterized by resource specificity and ecosystem vulnerability, thus, the scientific assessment of the impact of land use change on the carbon sequestration and other ecosystem service functions of island ecosystems is of great significance to the sustainability management of islands. The Dongtou Islands in Zhejiang Province represents a typical island ecosystem that has undergone developmental utilization such as land reclamation and conservation-restoration initiatives like the Blue Bay Project. It serves as an ideal case study for establishing assessment methods of how land use changes affecting the carbon sequestration service function of island coastal ecosystems and others, and for exploring the effectiveness of management measures. In this study, a land classification model based on XGBoost algorithm was used to obtain land use classification data of the Dongtou Islands in 12 phases (3 years as a phase)from 1988 to 2023 (with accuracy of 91.52%). On this basis, the changes in carbon sequestration amounts of major ecosystems, including woodland, salt marshes, and tidal flats, in the Dongtou Islands were calculated. A coupling coordination degree model of “economic development-land use-carbon sequestration function” was constructed by combining the socio-economic statistical data, and the degree of coupling coordination between the economy and ecosystem of the Dongtou Islands for more than 30 years was explored. The study found that from 1988 to 2023, the total land area of the Dongtou Islands increased by 34.97% due to natural silt deposition and sea reclamation efforts. The cumulative total of ecosystem carbon sequestration amount and net carbon sequestration amount for the main ecosystems amounted to 49.45×104 t and 46.13×104 t, respectively, basically showing an oscillating upward trend. Carbon sequestration mainly resulted from woodland and coastal wetlands (including tidal flats and salt marshes), with cumulative carbon sequestration amount of 25.44×104 t and 24.01×104 t, respectively. The “economic development-land use-carbon sequestration function” coupling coordination degrees of the Dongtou Islands were in a coordinated state from 2006 to 2023. Overall, the coupling coordination degree is greatly affected by the land use changes. Ecological restoration projects can enhance the comprehensive evaluation index of the land use and carbon sequestration function system, and then improve the coupling coordination degree. This study can provide a scientific theories and data foundation for the socio-economic development and ecological environmental protection planning of the Dongtou Islands.

  • Analysis of the formation mechanisms of the equatorial Pacific easterly wind surge in 1988
    WANG Dazhi, LIAN Tao
    2025, 43(3):1-10. DOI:10.3969/j.issn.1001-909X.2025.03.001
    Abstract ( 15 ) HTML ( 15 ) PDF ( 8140KB ) ( 5 )   
  • Evaluation the nonlinear wave spectrum of third-order Stokes waves based on NDBC buoy data
    HE Chaochao, WANG Ziyun, CAI Feng, WANG Haili, WANG Jin, LIU Yuli, DONG Changming
    2025, 43(3):11-20. DOI:10.3969/j.issn.1001-909X.2025.03.002
    Abstract ( 14 ) HTML ( 14 ) PDF ( 3556KB ) ( 5 )   
  • Intermediate currents and midwater plumes in deep-sea mining areas of the Pacific Ocean based on Argo trajectory data
    LIU Nuan, XU Dongfeng, YAO Zhixiong, WANG Jun, LIU Zenghong, YANG Chenghao, YANG Haiyan, BAO Hairong
    2025, 43(3):21-31. DOI:10.3969/j.issn.1001-909X.2025.03.003
    Abstract ( 8 ) HTML ( 10 ) PDF ( 6721KB ) ( 4 )   
  • Deep-sea polymetallic nodule image recognition method based on an improved Mask R-CNN model
    WENG Zebang, LI Xiaohu, LI Jie, LI Zhenggang, WANG Hao, ZHU Zhimin, MENG Xingwei, LI Huaiming
    2025, 43(3):32-39. DOI:10.3969/j.issn.1001-909X.2025.03.004
    Abstract ( 13 ) HTML ( 16 ) PDF ( 11174KB ) ( 6 )   
  • Analysis of tidal flat erosion and deposition changes with sediment budget: A case study of Dafeng tidal flat on the Jiangsu coast
    LEI Si, ZHU Shibing, ZHANG Yiyi, LI Mingliang, WANG Yaping, GAO Chao, WU Ziyin, GAO Shu, ZHOU Jieqiong
    2025, 43(3):40-48. DOI:10.3969/j.issn.1001-909X.2025.03.005
    Abstract ( 4 ) HTML ( 6 ) PDF ( 3562KB ) ( 2 )   
  • Experiments on wave dissipation performance of a new seawall ecological armour block
    LI Xiaoyan, YE Junwei, SHEN Jiafa, LUO Zhiwei, ZHENG Xin, ZHAO Haitao
    2025, 43(3):49-59. DOI:10.3969/j.issn.1001-909X.2025.03.006
    Abstract ( 6 ) HTML ( 8 ) PDF ( 8993KB ) ( 4 )   
  • Sedimentary characteristics and paleoenvironmental evolution during the Late Pleistocene of core NZD01 in southern Hangzhou Bay
    DING Hao, ZHANG Penghui, CHEN Chao
    2025, 43(3):60-72. DOI:10.3969/j.issn.1001-909X.2025.03.007
    Abstract ( 8 ) HTML ( 11 ) PDF ( 10321KB ) ( 5 )   
  • Progress in the protection and restoration of China’s oyster reefs: The practice of oyster reef restoration in Ruian
    WU Xiaowen, XUE Feng, CAI Jingbo
    2025, 43(3):73-80. DOI:10.3969/j.issn.1001-909X.2025.03.008
    Abstract ( 7 ) HTML ( 8 ) PDF ( 5053KB ) ( 7 )   
  • Food sources of benthic communities at the Weijia Gfuyot, Northwest Pacific
    FEI Yichu, YANG Zhi, ZHOU Yadong, ZHANG Dongsheng
    2025, 43(3):81-91. DOI:10.3969/j.issn.1001-909X.2025.03.009
    Abstract ( 10 ) HTML ( 9 ) PDF ( 3346KB ) ( 2 )   
  • Checklist of dominant zooplankton species in the Western Pacific seamount region
    SUN Rouxin, WANG Yanguo, YANG Yanyan, CHEN Yanghang, XIANG Peng, WANG Chunguang, XING Bingpeng
    2025, 43(3):92-102. DOI:10.3969/j.issn.1001-909X.2025.03.010
    Abstract ( 5 ) HTML ( 5 ) PDF ( 25309KB ) ( 1 )   
  • Influence of soil heavy metal distribution on carbon components in the coastal wetlands of Yueqing Bay in southern Zhejiang Province
    WU Xue, ZHAO Xin, SUN Hongcheng, GU Weifang, ZHU Kehua, GE Zhenming
    2025, 43(3):110-122. DOI:10.3969/j.issn.1001-909X.2025.03.011
    Abstract ( 5 ) HTML ( 5 ) PDF ( 9620KB ) ( 0 )   
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