【作者】 杨涛；

【导师】 李磊；

【作者基本信息】 中国海洋大学 ， 物理海洋学， 2013， 硕士

【摘要】 本文采用Aviso动力高度数据和NOAA的SST数据分析了2006年，2000年的黑潮延伸体区域的海表面温度锋，利用WRF模式模拟了这两年的12月1日－9日的海洋温度锋海区大气次级环流的结构和特征，在前人的研究当中2006年黑潮延伸体位置偏南，但是海洋温度锋的强度较强，2000年是海洋温度锋偏弱的一年，位置也较平均态偏南。文章重点分析这两年在模拟时间范围内的次级环流的实时变化，并且改变黑潮延伸体南侧的温度，模拟次级环流对温度锋强度的响应。模拟结果表次级环流并不是一直存在的，其受背景大气系统的影响很强，其结构有时甚至在周平均时间尺度上无法分辨。模式结果显示2006年在研究时间段内的次级环流强度比2000年同期要强，文章对研究时间段内海洋温度锋海区的大气结构和气象要素分布进行了分析，对比了不同大气系统影响下温度锋海区大气的结构。在改变温度锋南侧温度之后，温度锋南侧上升运动的最大高度有所增加，可以达到4km以上的高度，海表面高压强度减弱，低压强度加强。而温度锋北侧的次级环流的下沉运动变强，大气底层由于北风引起的冷平流作用增强，潜热通量沿黑潮延伸体呈明显的带状分布，感热通量也呈现类似的分布，但是潜热在这一海区的海气热交换中起主导作用。水汽的变化主要集中2km以下，温度锋南侧温度增加之后，水汽的径向梯度变大。实验中次级环流的增强导致了中高空的西风动量下传作用明显，从而使得温度锋海区的大气底层的西风明显有所增加。更多还原

【Abstract】 This paper analyse sea surface temperature front of KuroshioExtension（KE）inwinter of2000and2006using dynamic height data from Aviso and SST from NOAA,and simulate the secondary circulation structure December1–9,2000and2006usingWRF model. As we known, the location of atmospheric secondary circulationstructure is southerly in winter2006,and the strength is stronger.in2000,the locationis also southerly but the strength is weaker. The article focuses especially on real-timechanges of the secondary circulation within the scope of the simulation time, and theresponse of the secondary circulation on the strength of the temperature front.The simulative results show that the secondary circulation does not always exist,which is strongly influenced by the background atmospheric system and sometimesstructure can not be identified, and the strength of the secondary circulation isstronger in2006than that in2000during the research period. We analyze theatmospheric structure and meteorological elements in the ocean temperature frontarea and compare the structure under different atmospheric systems. After changingthe temperature of the south of the front, the height of the upward flow becomeshigher up to more than4km at the south side, the high sea level pressure (SLP) getweaker, the low SLP gets stronger. But at the opposite side, the downward flow ofsecondary circulation becomes stronger, at the atmosphere bottom, the influence ofthe cold convection get stronger due to the north wind, the latent heat flux showszonal distribution along the KE, so does the sensible heat flux,andtheformer playsa dominate role in the sea-air heat exchange. The vapor changing mainly happensbelow2km, after the temperature of the south of front getting higher, the meridionalgradient get stronger. During the experiment, the stronger secondary circulationresults in the upper west wind momentum downward transport getting obviouslystronger, whichleads the bottom west wind of the temperature front zone getting evidently stronger更多还原