| Qingdao Institute of marine geology, China Geological Survey | Host |
| Citation: |
PENG Jiacheng, WANG Houjie, WU Xiao. Seasonal variation of the Yellow Sea cold water mass and its impact on suspended sediment transport[J]. Marine Geology & Quaternary Geology, 2024, 44(5): 58-69. doi: 10.16562/j.cnki.0256-1492.2024041401
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Seasonal variation of the Yellow Sea cold water mass and its impact on suspended sediment transport
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Abstract
The Yellow Sea Cold Water Mass (YSCWM) is a typical hydrological phenomenon in the Yellow Sea in summer, it has significant impacts on regional circulation system, material transport, and ecosystem. Based on the observation data of hydrological and suspended sediment concentration (SSC) in different seasons in the Yellow Sea, combined with HYCOM model data, the seasonal variations of the YSCWM and its impact on suspended sediment transport were investigated. The findings indicate notable seasonal variations in the YSCWM: emerging in spring, reaching its peak in summer, weakening from late summer to early autumn, and disappearing in winter. The hydrographic structure of the YSCWM also experiences adjustments as manifested by the reduction in vertical temperature gradient, the increase in thermocline depth from 20 m to 40m, and the movement of temperature front at boundary from 121°E to 123°E. The presence of thermocline and temperature fronts restricts the vertical diffusion and horizontal transport of suspended sediments across layers and fronts. These seasonal variations of the YSCWM lead to the expansion of the nearshore dispersion area of suspended sediments, the increase in SSC at the bottom of the YSCWM, and the decrease in SSC above the YSCWM.
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References
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PENG Jiacheng, WANG Houjie, WU Xiao. Seasonal variation of the Yellow Sea cold water mass and its impact on suspended sediment transport[J]. Marine Geology & Quaternary Geology, 2024, 44(5): 58-69. doi: 10.16562/j.cnki.0256-1492.2024041401
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Figure 1.
The distribution of terrain (a), observation stations, and analysis points (A-E) (b) in the study area
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Figure 2.
The fitting results of HYCOM temperature vs CTD temperature, and measured suspended sediment concentration (SSC) vs CTD turbidity
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Figure 3.
Monthly average distribution of bottom water temperature in the Yellow Sea in 2015
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Figure 4.
Curves and coverage areas of monthly average variation of Yellow Sea cold water mass in 2015
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Figure 5.
Annual variation in the temperature difference of bottom water in the 36°N section in 2015
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Figure 6.
Seawater vertical temperature gradient distribution in summer and autumn of 2015
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Figure 7.
Horizontal gradient distribution of bottom temperature in summer and autumn of 2015
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Figure 8.
Distribution of the ocean circulations at 10 m depth in summer and autumn of 2015 (based on HYCOM model results)
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Figure 9.
Distribution of long-term average sea surface height in the Yellow Sea in summer and autumn[38]
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Figure 10.
Distribution of geostrophic current velocity at 36°N section in summer and autumn of 2015
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Figure 11.
Distribution of suspended sediment concentration at 36°N section in summer and autumn of 2015
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Figure 12.
Vertical distribution of temperature, salinity, and suspended sediment concentration at the 36°N section in stations (A—E) in summer and stations (A1—E1) in autumn