影响吕宋海峡水体输运量年代际变化的局地因子

发布时间：2018-06-15 19:40

本文选题：吕宋海峡水体输运量 + 年代际变化　；参考：《热带海洋学报》2016年04期

【摘要】：一般认为,吕宋海峡北南两端压力梯度或深度积分的动力高度差是太平洋水通过吕宋海峡西侵南海最直接的动力学。这一动力高度差与吕宋岛西部外海气旋式中尺度涡(即吕宋冷涡,Luzon cold eddy,LCE)的季节性出现有关,而LCE活跃区上空正的风应力旋度(wind stress curl,WSC)在LCE的产生中起主要作用。基于上述思路,利用涡分辨力海洋环流模式OFES[oceanic general circulation model(OGCM)for the Earth Simulator]的62年(1950—2011)后报结果首先得出吕宋海峡水体输运量(Luzon Strait transport,LST)不仅有约3年和7年显著的年际振荡,而且有约14年显著的年代际变化。然后分析LCE活跃区上空WSC异常场主要模态低频振荡特征以寻找影响LST年际和年代际变化的局地因子。结果表明,对LCE活跃区上空WSC去除季节性信号的异常场做经验正交函数(empirical orthogonal function,EOF)分析取得了典型的年际以上尺度的主要模态特征,其第一模态时空变化表现为约14年显著的年代际振荡和WSC异常场正位相区年代际尺度上的南移,而第二模态表现为约3年显著的年际振荡和WSC异常场正位相区年际尺度上的北移。另一方面,LST约7年的变化特征可视为源区黑潮水体输运量低频变化在该尺度上的印记。
[Abstract]:It is generally believed that the dynamic height difference between the pressure gradient or the depth integral on the north and south sides of the Lv Song Strait is the most direct dynamics of the Pacific water through the Lv Song channel West invasion of the South China Sea. This dynamic height difference is related to the seasonal appearance of the mesoscale vortex of the western Lv Song Island (i.e. the Lv Song cold vortex, Luzon cold eddy, LCE), and the LCE active area above the active region. The positive wind stress curl (wind stress curl, WSC) plays a major role in the production of LCE. Based on the above ideas, the 62 years (1950 - 2011) of the vortex resolution ocean circulation model, OFES[oceanic general circulation model (OGCM) for the, first obtained the volume of water transport in the Luzon Strait. Not only have the significant interannual oscillations of about 3 and 7 years, but also have significant interdecadal changes for about 14 years. Then, the main modal low frequency oscillations of the WSC anomaly field over the active region of LCE are analyzed to find the local factors that affect the interannual and interdecadal variations of LST. The results show that the abnormal field of removing seasonal signals from the upper air WSC in the active region of LCE is experienced. The empirical orthogonal function (EOF) analysis obtained the typical main modal characteristics of the interannual above scale, and its first mode spatiotemporal variation shows about 14 years' significant interdecadal oscillations and the South shift of the positive phase region of the WSC anomaly field, while the second mode shows a significant interannual and WSC anomalies about 3 years. On the other hand, the change characteristics of LST for about 7 years can be seen as a mark on the low frequency variation of the transport volume of the Kuroshio Water Body in the source area.
【作者单位】：中国科学院海洋研究所;中国科学院海洋环流与波动重点实验室;中国科学院大学;
【基金】：中国科学院战略性先导科技专项(XDA11020101) 海洋公益性行业科研专项经费项目(201105002-2)~~
【分类号】：P731.26

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