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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400~700 m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、SODA 2.2.4数据集、WOD09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。
By analyzing the single point potential observation data of the Kuroshio source region from November 2010 to July 2011, it is found that there is a seasonal variation in southward deep sea currents of 400 ~ 700 m under the upper north Kuroshio (winter> summer> spring). Combined with satellite altimeter data, SODA 2.2.4 dataset and WOD09 data model data, the observed results are analyzed. One possible mechanism of the seasonal changes in the deep southward flow is as follows: climatic background flow at the observation point and mesoscale eddy motion disturbance Overlay. Further, based on the HYCOM model data, the main Kuroshio current source was calculated, and the latitudinal distance between the co-islets and the co-current axis of the submarine was observed during the observation period (winter> summer> spring) Another possible mechanism is that the latitudinal distance between the target place and the source Kuroshio main axis will directly affect the observation results. The closer the submarine is to the main axis, the faster the flow velocity is, and the weaker the opposite is.