| Qingdao Institute of marine geology, China Geological Survey | Host |
| Citation: |
LI Wenjian, WANG Zhenyan, HUANG Haijun. Grain size distribution pattern and influencing factors of suspended matters in the Southern Yellow Sea during summer season[J]. Marine Geology & Quaternary Geology, 2020, 40(6): 49-60. doi: 10.16562/j.cnki.0256-1492.2020011002
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Grain size distribution pattern and influencing factors of suspended matters in the Southern Yellow Sea during summer season
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Abstract
The Southern Yellow Sea is an important passage for transporting terrigenous materials from the East Asian continent to the western Pacific Ocean. It is of great significance to clarify the size and distribution patterns of the particles transported through the Southern Yellow Sea for further understanding the source to sink system of the region. In this paper, we analyzed the grain size distribution and its influencing factors based on the hydrological and LISST data measured in the Southern Yellow Sea during the summer season of 2012. The results show that fine particles (≤128 μm) are mainly composed of inorganic particles, while the coarse (＞128 μm) dominated by organic particles during the summer season. The inorganic particles are mainly distributed in the well-mixed coastal shallow area and the bottom layer offshore, while organic particles mainly occupy the pycnocline where the water is highly stratified. The resuspended surface sediment is the main source of inorganic particles, and the tidal mixing process is the main driving force of resuspension. The tidal mixing front prevents the coastal inorganic particles from spreading to the offshore area in bottom layer, but some finer particles (＜16 μm) can be transported to the central Southern Yellow Sea by surface cross-front currents. The pycnocline obstructs the upward diffusion of nutrients inside the Yellow Sea Cold Water Mass, which leads to the accumulation of phytoplankton in the pycnocline. The coarse particles (＞128 μm) are mainly from the plankton or aggregates formed by organic secretion mixed with fine inorganic particles. The formation of aggregates enhances the sedimentation of surface fine inorganic particles and promotes the formation of mud deposits.
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References
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LI Wenjian, WANG Zhenyan, HUANG Haijun. Grain size distribution pattern and influencing factors of suspended matters in the Southern Yellow Sea during summer season[J]. Marine Geology & Quaternary Geology, 2020, 40(6): 49-60. doi: 10.16562/j.cnki.0256-1492.2020011002
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Figure 1.
Topography and sampling stations of the study area
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Figure 2.
Horizontal distribution of temperature （ ℃） and salinity in the study during summer season.
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Figure 3.
Vertical distribution of temperature （a1—d1, ℃） and salinity （a2—d2） of the study area during summer season
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Figure 4.
Vertical distribution of MC （a1—d1, mg/L） and chl a concentration （a2—d2, μg/L） of the study area during summer season
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Figure 5.
Average VC （black solid dots） and correlation between MC and VC （black triangle） of suspended particulate matter in different sizes. The VC was averaged based on all stations and layers
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Figure 6.
Vertical distribution of total VCs （a1—d1） inorganic （a2—d2） and organic （a3—d3） VCs of the study area during summer season
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Figure 7.
Particle size distribution in some typical stations
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Figure 8.
The sediment types in the Southern Yellow Sea （modified from reference [29] ）
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Figure 9.
Vertical distribution of temperature, salinity, chl a, N2 and cumulative frequency distribution of inorganic and organic particles at typical stations
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Figure 10.
Map of sampling locations, the amphidromic system of the principal M2 constituent, and the elliptical axes of M2 tidal currents in the Southern Yellow Sea
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Figure 11.
Correlation between the depth of the maximum chl a concentration with the maximum density gradient （a） or TVC （b） during summer season