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中文摘要：
通过分析2010年11月至2011年7月黑潮源区的单点潜标观测数据，得出在上层北向黑潮之下400～700m的南向深层海流存在季节内变化（冬季〉夏季〉春季）。结合卫星高度计数据、SODA2．2．4数据集、W01309数据模式资料对观测结果进行分析，得到深层南向流季节内变化的一个可能影响机制为：观测点气候态背景流与中尺度涡旋运动扰动的叠加。进一步，结合HYCOM模式数据计算源地黑潮流主轴，得到在观测期间潜标放置点同流轴的纬向距离存在季节内变化（冬季〉夏季〉春季），得出深层南向流季节内变化的另一个可能影响机制为：潜标放置点与源地黑潮主轴的纬向距离会直接影响观测结果，潜标越靠近主轴测得流速越强，相反则越弱。
英文摘要：
Using subsurface buoy data during November 2010 to July 2011, the south flow, which is under the northward Kuroshio Current between 400 m to 700 m, was studied. According to the time series available from sub- surface buoy, the seasonality of the south flow strength is winter 〉 summer 〉 spring. In addition to the Acoustic Doppler Current Profiler （ADCP） data, satellite altimeter data, the SODA 2.2.4 and the World Ocean Database 2009 （WOD09） were further analyzed and a possible influence mechanism is： the intraseasonal variation （winter〉 summer〉spring） of the south flow is mostly influenced by mesoscale eddies east of Luzon, indicating that the ob- served flow is a combination of background flow and eddy-induced flow. With the consideration of oscillating of the source of the Kuroshio which affected the on observation, we calculated the axis of the source of the Kuroshio based on HYCOM data by using weighted average method. A number of features of During November 2010 to July 2011, significant intraseasonal variability of the the Kuroshio axis were identified distance between Kuroshio axis and the longitude of buoy （122.7~E） was exposed. The whole layer had influence on the axis from surface to 700 m. Therefore, another possible influence mechanism is： The observed flow is also influenced by the horizontal oscilla- tion of the Kuroshio axis, the observed meridional velocity is higher when the distance is smaller, and vice versa.
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