Study of the Response of Environmental Factors of the Coastal Area in Zhoushan Fishery to Typhoon In-fa Based on Remote Sensing

Tang, Rong; Cai, Lina; Yan, Xiaojun; Ye, Xiaomin; Xu, Yunfei; Yin, Jingdong

doi:10.3390/rs15133349

Cited by 3 publications

(1 citation statement)

References 67 publications

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“…It serves as a vital spawning and feeding ground for a multitude of economical fish and shrimp species [31]. Zhoushan fishery possesses unique geographical conditions that make it an excellent fishing ground and the largest offshore fishing ground in China [27]. The abundant aquatic resources in Zhoushan fishery support a diverse ecosystem, including over 300 species of fish.…”

Section: Study Areamentioning

confidence: 99%

Study on the Typical Environmental Factors in the Middle Part of Zhoushan Fishery Based on HY-1C/D and Other Multi-Source Data

Zhang,

Cai,

et al. 2024

Water

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This study utilizes satellite data, including HY-1C/D, along with reanalysis data, to unveil the typical environmental characteristics of the sea surface in the middle of Zhoushan fishery. The article addresses three main issues. The first one is the development of an ocean primary productivity (OPP) inversion algorithm model. The second one is the study of chlorophyll-α (Chl-α) concentration and OPP distribution characteristics in Zhoushan fishery using China’s domestically produced ocean satellite HY-1C/D CZI data. The last one is the revelation of the characteristics of typical environmental factors on the sea surface at Zhoushan fishery by combining HY-1C/D with multi-source data. The results show the following: (1) The middle part of Zhoushan fishery exhibits significant seasonal and regional variations in Chl-α concentration and OPP. Chl-α concentration ranges mainly between 0.2 and 2.9 µg/L, with higher concentrations in spring and summer and lower Chl-α concentrations in autumn and winter. Spatially, Chl-α concentration gradually decreases from west to east. The OPP in the study area ranges from 100 mg·m−2d−1 to 1000 mg·m−2d−1, with high OPP values distributed on the western side, ranging from 400 mg·m−2d−1 to 1000 mg·m−2d−1, and gradually decreasing seaward. The highest OPP occurs in summer and the lowest in winter. (2) The correlation analysis between Chl-α concentration and OPP revealed a strong positive relationship. Consequently, this study developed an empirical model for estimating OPP based on Chl-α concentration and validated its feasibility. The model applies to areas with Chl-α concentrations ranging from 0.2 to 4 µg/L. (3) The convergence of freshwater injection, multiple ocean currents, and seasonal upwelling in the study area brings about a rich supply of nutrients. Additionally, the region is characterized by suitable conditions, including optimal Chl-α concentrations, OPP, SST, salinity, currents, and geological water depths. The synergistic effect of these factors together contributed to the formation of Zhoushan fishery.

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Section: Study Areamentioning

confidence: 99%

Study on the Typical Environmental Factors in the Middle Part of Zhoushan Fishery Based on HY-1C/D and Other Multi-Source Data

Zhang,

Cai,

et al. 2024

Water

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The Impacts of Far‐Field Typhoon‐Generated Coastal Trapped Waves on the Hydrodynamics in the Northern South China Sea: A Case Study of Typhoon In‐Fa

Hu,

Li,

et al. 2024

JGR Oceans

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Coastal Trapped Waves (CTWs) have the potential to transmit significant energy from atmospheric wind systems, causing dramatic coastal changes over vast areas, even far from the wind systems. This study investigated the impacts of CTWs generated by Typhoon In‐fa (2021) on the northern South China Sea (NSCS) hydrodynamics using tide gauge observations, reanalysis data, and numerical model outputs. The analysis results indicate that the CTWs induced by Typhoon In‐fa exhibit distinct characteristics in different phases of wave crest and trough. During the crest phase, coastal currents generated by CTWs flow opposite to the background circulation, while during the trough phase, they flow in the same direction. This process is accompanied by changes in cross‐shore currents, such that during the crest phase of CTWs, the cross‐shore currents are landward at the surface and seaward at the bottom, while during the trough phase of CTWs, the cross‐shore currents become reversed. These changes further lead to downwelling in temperature, salinity, and density during the crest phase of CTWs, and upwelling during the trough phase of CTWs. Results from a linear CTW model demonstrated that the above characteristics agreed with the traditional CTW theory. Sensitivity experiments with the Regional Ocean Model System (ROMS) explored key factors influencing NSCS hydrodynamics, including local winds and CTWs from Typhoon In‐fa. The local winds and CTWs have different effects: they compete during the crest phase and co‐work during the trough phase, with local winds dominating the sea surface and CTWs dominating the seabed.

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Remote-Sensing Estimation of Upwelling-Frequent Areas in the Adjacent Waters of Zhoushan (China)

Xiao,

Feng,

Qiu

et al. 2024

JMSE

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Upwelling, which mixes deep and surface waters, significantly enhances the productivity of surface waters and plays a critical role in marine ecosystems, especially in key fishing areas like Zhoushan. This study utilized merged sea surface temperature data and an upwelling edge detection algorithm based on temperature gradients to analyze the characteristics of upwelling in Zhoushan and the Yangtze River Estuary over the past 28 years. The results indicate that upwelling in Zhoushan begins in April, peaks in July, gradually weakens, and disappears by October. The phenomenon is most pronounced during the summer months (June to August), with significant spatial distribution differences in April and September. Notably, high probability values of upwelling centers and core areas are mainly concentrated near Ma’an Island, Zhongjieshan Island, and Taohua Island. In these areas, upwelling remains stable during the summer, forming a unique “footprint” distribution pattern, and these are also the locations of the Zhoushan National Marine Ranch. From April to August, the extent of the upwelling area gradually decreases and stabilizes. These findings emphasize the frequent upwelling activity around Zhoushan and its significant contribution to the formation of local fisheries. Additionally, considering that the formation of natural upwelling in the East China Sea depends on the southern monsoon, the study suggests establishing artificial upwelling systems during periods unfavorable for natural upwelling, based on high probability areas, to enhance fishery yields and support the development of local fisheries.

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Study of the Response of Environmental Factors of the Coastal Area in Zhoushan Fishery to Typhoon In-fa Based on Remote Sensing

Cited by 3 publications

References 67 publications

Study on the Typical Environmental Factors in the Middle Part of Zhoushan Fishery Based on HY-1C/D and Other Multi-Source Data

Study on the Typical Environmental Factors in the Middle Part of Zhoushan Fishery Based on HY-1C/D and Other Multi-Source Data

The Impacts of Far‐Field Typhoon‐Generated Coastal Trapped Waves on the Hydrodynamics in the Northern South China Sea: A Case Study of Typhoon In‐Fa

Remote-Sensing Estimation of Upwelling-Frequent Areas in the Adjacent Waters of Zhoushan (China)

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