Research On Hydrodynamic Characteristics Of Yellow Sea In Mid-Holocene

Of the Holocene (about6,000years ago, denoted by6ka) marine and climate research can deepen people at this stage of climate change and the marine environment awareness, to predict future ocean and climate change provide an important reference. Papers based on air-sea coupled model FGOALS-s2.0the6ka and Oka results as forcing data, the use of marine areas POM model ocean dynamics of the East China Sea to simulate the dynamic environment mainly in the Yellow Sea in Holocene climate scenarios for climate change response.Comparison of ancient and modern atmospheric forcing results are as follows, summer, yellow, compared to0ka East wind6ka during the period increased approximately0.8m/s; Yellow wind stress curl is positive, the East China Sea is negative, compared with0ka period of absolute vorticity values were increased; while solar radiation received two sea are higher than0ka period. Winter, Yellow, East China Sea north wind strengthened, increasing the amount of the East China Sea in the0.5～1.0m/s; net heat release two sea winter period also increased compared to0ka, Tokai release even more; winter wind stress curl over the period0ka no big difference. The simulation results in a new era of atmospheric elements of the world need to be further evidence of the geological record observational evidence, but for a series of changes in atmospheric forcing factors, the corresponding dynamic environment Holocene Yellow responds:mid-Holocene period HWC more modern and more obvious, forces more focused way northward into two distinct, and its tributaries on the west side more than the current going north, central heating flow south of the Yellow Sea and the Korean coastal streams into a very obvious enough anticyclonic clockwise circulation. Meanwhile, north of the YSWC has been related to the surface. Modern HWC weak stream width, exists only in the deeper water layers; South Yellow Sea north to the warm tongue of warm water temperatures packet network is significantly higher than the modern result, the maximum temperature increase of about3℃; addition, the Holocene Yellow summer upper mixed strongly to deepen the thermocline results than modern5-10m, the bottom cold water mass range decreases, cold water group was significantly shrink to deep water trough and cold water at the temperature lower than modern nuclear results; in strong summer under the action of the wind, the west coast of the Yellow Sea surfac flow steering position than modern latitude north-2, which shares the coast northward flow was significantly stronger than the forces of modern.Yellow paper from the recovery of ancient water depth, reduced winter monsoon, the Kuroshio flow boundary changes in open angle made four sensitivity experiments. The results were as follows:After the restore some ancient water depth, warm winter in the Yellow Sea to the west branch of bias enhanced, resulting in a temperature increase in the Yellow Sea near the West Bank Chengshan. Cold water to enhance the east side of the south, making the Cheju Strait near the water is reduced. Yellow Sea, the maximum flow rate eastward shift northward, but also induce warm core central Yellow Sea eastward bias; reduced after the winter wind, the Yellow Sea circulation overall weakened, weakened coastal streams makes the nature of the Yellow Sea as compensation for the same warm stream weakened. Experiments show reduced winter wind, ocean mixing significantly weaker, while allowing to reduce the latent heat of evaporation, sea surface to reduce heat loss, increasing the overall temperature of the Yellow Sea; summer Yellow submarine cold winter residual group is forme by cold winter bottom temperature increases, resulting in a residual Yellow summer bottom water temperature increases. Increase or decrease the flow of the Kuroshio east of Taiwan to open at the boundary, and the flow of the Yellow Sea warm summer cold water mass circulation in the Yellow Sea have little effect. In short, with the deepening of the Yellow Sea, bottom topography, local wind field and forced open the Yellow Sea border circulation caused by different effects, the smaller the impact of open boundary forcing larger local wind effects and bottom topography.