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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.

  • Is the leaching of silicate mineral dissolution in sandy permeable particulate matters responsible to the unusual enrichment of summer silicate in an offshore area in Muping, Yantai?
    HAN Yajing, ZHENG Liwen, LI Chenglong, ZHANG Yong, ZHAI Weidong
    2025, 43(2):1-10. DOI:10.3969/j.issn.1001-909X.2025.02.001
    Abstract ( 88 ) HTML ( 92 ) PDF ( 5912KB ) ( 68 )   
  • Generation and dissipation of near-inertial internal waves under the regulation of seamount width
    WANG Wenbo, XIE Xiaohui
    2025, 43(2):11-18. DOI:10.3969/j.issn.1001-909X.2025.02.002
    Abstract ( 20 ) HTML ( 20 ) PDF ( 3692KB ) ( 10 )   
  • Analysis of the characteristics of extreme waves caused by typhoon and cold wave in the Cangnan sea area of Zhejiang Province
    HUAN Caiyun, JIANG Zhenqiang, XU Kundi, WANG Jiaxin
    2025, 43(2):19-29. DOI:10.3969/j.issn.1001-909X.2025.02.003
    Abstract ( 20 ) HTML ( 33 ) PDF ( 5174KB ) ( 11 )   
  • Tidal flat topography inversion method based on tidal level complementary cumulative distribution function: A case study of Yueqing Bay
    ZHANG Zhaoyuan, ZHANG Huaguo, CAO Wenting, LI Dongling
    2025, 43(2):30-38. DOI:10.3969/j.issn.1001-909X.2025.02.004
    Abstract ( 21 ) HTML ( 25 ) PDF ( 5226KB ) ( 3 )   
  • Reconstruction of strip-like missing data in geostationary satellite remote sensing imagery based on convolutional neural networks
    HE Qi, SHEN Hao, HAO Zengzhou, LI Yunzhou, HUANG Haiqing
    2025, 43(2):39-46. DOI:10.3969/j.issn.1001-909X.2025.02.005
    Abstract ( 20 ) HTML ( 25 ) PDF ( 4866KB ) ( 20 )   
  • The carbon sequestration service function of island coastal ecosystems: A case study on the impact assessment of land use changes in the Dongtou Islands
    CHANG Lexin, ZHU Bozhong, GUO Mao, LI Teng, GONG Fang, ZHU Qiankun, BAI Yan
    2025, 43(2):47-57. DOI:10.3969/j.issn.1001-909X.2025.02.006
    Abstract ( 22 ) HTML ( 21 ) PDF ( 7015KB ) ( 9 )   
  • Evaluation and analysis of the global ionospheric model accuracy in the South China Sea based on shipboard GNSS data: Take the magnetic storm in May 2024 as an example
    LI Guoxiang, LUO Xiaowen, WAN Hongyang, CUI Jiaxin, WEI Wei
    2025, 43(2):58-66. DOI:10.3969/j.issn.1001-909X.2025.02.007
    Abstract ( 24 ) HTML ( 24 ) PDF ( 3984KB ) ( 4 )   
  • Optimization of FVCOM model algorithm for response coefficient method: A case study of Xiangshan Bay
    QIN Zhihao, HU Song, CHEN Qinsi
    2025, 43(2):67-78. DOI:10.3969/j.issn.1001-909X.2025.02.008
    Abstract ( 22 ) HTML ( 22 ) PDF ( 8358KB ) ( 9 )   
  • Spatiotemporal distribution of total nitrogen in the Pearl River Estuary-Jiangmen sea area from 2003 to 2023
    TIAN Hongzhen, ZHANG Zheng, DENG Shaofu, YANG Jia, LIU Qinping
    2025, 43(2):79-87. DOI:10.3969/j.issn.1001-909X.2025.02.009
    Abstract ( 21 ) HTML ( 21 ) PDF ( 8093KB ) ( 5 )   
  • Distribution and influencing factors of organic carbon in mangrove surface sediments in Yanpu Bay, Zhejiang Province
    LÜ Congcong, YU Yang, LI Bin, SHUI Bonian, HU Chengye
    2025, 43(2):88-96. DOI:10.3969/j.issn.1001-909X.2025.02.010
    Abstract ( 19 ) HTML ( 20 ) PDF ( 3193KB ) ( 8 )   
  • Community composition of microalgae and its contribution to carbon stock in muddy tidal flat in Aiwan Bay
    CHEN Hao, JIANG Zhibing, LI Lei, LIU Chenggang, YU Peisong, ZENG Jiangning
    2025, 43(2):97-106. DOI:10.3969/j.issn.1001-909X.2025.02.011
    Abstract ( 11 ) HTML ( 13 ) PDF ( 3297KB ) ( 6 )   
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