Barotropic current fluctuations coupled with sea level drawdown in Yellow and Bohai Seas

• 作 者: 万凯 鲍献文 王毅 万修全 李昊倩 刘珂
• 机 构: College of Physical and Environmental Oceanography,Ocean University of China,North China Sea Marine
• 出 处: Chinese Journal of Oceanology and Limnology
• 发表日期: 2015年01期
• 关键词: Bohai fluctuation northward concurrent winter seasonal Yellow tidal remarkable c

Sub-tidal barotropic current variations coupled with residual sea level fluctuation in the Bohai and Yellow Seas during wintertime are addressed in this study.The temporal evolution and spatial distribution of current fluctuation are investigated using moored acoustic Doppler current profiler data in a three-dimensional numerical model.It is found that a southward current followed by a northward current occurred in the northern Yellow Sea during the fluctuation,concurrent with a significant outflow followed by inflow through the Bohai Strait.The process is consistent from surface to bottom and is coupled with remarkable residual sea level fluctuation.This quasi three-day fluctuation with amplitude 0.2-0.3 m/s leads to 1 m/1.2 m drawdown in the northern Yellow and Bohai Seas,respectively,strongly influencing water exchange between those seas.Because this a prominent feature in the seas,it is necessary to evaluate its effect on fluctuation during winter in future studies,in particular,the northward current during the recovery phase of sea level in the Bohai and Yellow Seas regarding seasonal variation.

Sub-tidal barotropic current variations coupled with residual sea level fluctuation in the Bohai and Yellow Seas during wintertime are addressed in this study. Temporal evolution and spatial distribution of current fluctuations are investigated using moored acoustic Doppler current profiler data in a three-dimensional numerical model.It is found that a southward current followed by a northward current occurred in the northern Yellow Sea during the fluctuation, concurrent with a significant outflow by inflow through the Bohai Strait. The process is consistent from surface to bottom and is coupled with remarkable residual sea level fluctuation. This quasi three-day fluctuation with amplitude 0.2-0.3 m / s leads to 1 m / 1.2 m drawdown in the northern Yellow and Bohai Seas, respectively, strongly influencing water exchange between those seas.Because this a prominent feature in the seas, it is necessary to evaluate its effect on fluctuation during winter in future studies, in particular, th e northward current during the recovery phase of sea level in the Bohai and Yellow Seas regarding seasonal variation.