Citation: | YUAN Ping, WANG Houjie, BI Naishuang, WU Xiao, ZHANG Yong. Temporal and spatial variations of oceanic fronts and their impact on transportation and deposition of fine-grained sediments in the East China Shelf Seas[J]. Marine Geology & Quaternary Geology, 2020, 40(3): 25-42. doi: 10.16562/j.cnki.0256-1492.2019050602 |
Observed hydrologic datasets and HYCOM modelling data were used in this paper to evaluate the applicability and stability of the HYCOM temperature and salinity data to the temporal-spatial distribution of oceanic fronts and its impact on transportation and deposition of fine-grained sediments in the East China Shelf Seas. The results show that the distribution of thermal fronts or salinity fronts are similar on the surface and bottom in the Bohai, Yellow and East China Seas excluding the east of Okinawa Trough. However, the strength and coverage of the fronts on the bottom are larger than those on the surface. The location of thermal fronts depends on the basic structure of currents. Both the surface and bottom thermal fronts develop along the boundaries of water masses, suggesting that thermal current fronts are closely related to the current and water masses of the study area. However, the distribution of the salinity fronts is greatly influenced by water discharge, coastal currents and warm currents. In addition, the distribution of mud patches in the Eastern China Shelf Sea are closely related to the patterns of oceanic fronts, which means that the thermal and salinity fronts do play a critical role in the formation of mud deposits.
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General patterns of seasonal circulation system in the East China Seas: (A) winter; (B) summer (modified after Guan (1994)[47]and Su et al. (2005)[42])
Map of survey stations(a. survey in spring, b. survey in summer, c. survey in autum, d. survey in winter)
Correlation between in-situ temperature-salinity data and HYCOM temperature- salinity data
Distribution of surface velocity fields from HYCOM model (base map: current speed; direction of arrows: direction of current; size of arrows: current speed are shown)
Distribution of bottom velocity fields from HYCOM model (base map: current speed; direction of arrows: direction of current; size of arrows: current speed are shown)
Horizontal gradient of surface temperature based on HYCOM surface temperature data
Horizontal gradient of bottom temperature based on HYCOM bottom temperature data
Horizontal gradient of surface salinity based on HYCOM surface salinity data
Horizontal gradient of bottom salinity based on HYCOM bottom salinity data
Distribution of mud patches in the East China Seas (modified after Saito and Yang, 1995[56]) and isopach map of the Holocene mud (redrawing of Yang and Liu, 2007[74]and Liu et al., 2007[3])