黑潮15m层流路和流轴的逐月分析及数模结果检验

发布时间：2018-08-07 20:51

【摘要】：本文利用1979年2月至2012年3月共33年的水帆位于15m层的Argos漂流浮标资料，绘制黑潮流系15m层的多年年平均和月平均流场，，运用特征线方法计算得到黑潮流轴，定义黑潮流动路径的边界为流速大小介于0.4-0.6kn的过渡性区域，对黑潮多年年平均和月平均主要特征进行了分析研究，并据此对有限元海湾海洋模式（FVCOM）模拟的相关特征进行了检验分析。漂流浮标观测结果显示：黑潮多年年平均流路大致是一个以（13.5°N,142°E）为圆心、2235km为半径的直角弧段，其在吕宋海峡、台湾东北、九州西南及伊豆海岭附近海区发生气旋式弯曲前先进行反气旋式弯曲调整，弯曲处出现的路径开口主要是支流的并入或分支的流出；黑潮流轴整体性偏向黑潮左边界，其中在吕宋岛东北至台湾以东海域最为显著，在本州岛以南海域次之，而在东海黑潮流段最不明显；黑潮流路上的流速在总体上由南向北呈增大趋势，但并非沿流路持续性逐渐增加，而是呈现出较平直流段的大流速区和弯曲调整流段的低流速区相互交错的状况，其中多年平均观测资料显示四国岛以南至伊豆诸岛以西流段的流速为最大。多年月平均流场显示，2、5、8、11这4个月份是黑潮流路和流轴发生变化的重要转折期，而1、4、7、10这4个月份则是各季节的代表月份。其中，冬季月份的黑潮流路和流轴最为曲折，向边缘海发生显著入侵；夏季月份的黑潮流路和流轴最为平直，左侧伴随有北向流动；春、秋两季的过渡性特征则比较明显。对FVCOM数值模拟结果的检验表明，FVCOM模拟结果在总体上表现出与观测结果的一致性，细节上的差别主要表现在：模拟结果的流速总体上偏小而流幅偏宽；模拟结果的最大流速段位于房总半岛以东流段，而实测结果则位于四国岛以南至伊豆诸岛以西流段；模拟结果没有较好显示出黑潮在大隅海峡的流况，也没有更好反映出黑潮在伊豆海岭处的调整状况等。
[Abstract]:In this paper, using the Argos floating buoy data of water sail in 15m layer from February 1979 to March 2012, the annual and monthly mean flow fields in 15m layer of the Kuroshio system are plotted, and the Kuroshio axis is calculated by using the characteristic line method. The boundary of the Kuroshio flow path is defined as the transitional region with velocity between 0.4-0.6kn and the Kuroshio flow path. The main characteristics of the annual and monthly Kuroshio mean are analyzed and studied. Based on this, the relevant characteristics of the finite element Gulf Ocean Model (FVCOM) simulation are tested and analyzed. The observation results of drifting buoy show that the Kuroshio annual average flow path is approximately a right-angled arc with a radius of (13.5 掳N ~ (142) 掳E) at a radius of 2235 km. It is located in the Luzon Strait and northeast of Taiwan. In the southwest of Kyushu and near the Yidou Ridge, the anticyclonic bend was made before the cyclonic bend occurred. The path opening at the bend was mainly the merging of the tributaries or the outflow of the branches; the overall Kuroshio axis shifted towards the left boundary of the Kuroshio. Among them, the sea area from northeast Luzon Island to the east of Taiwan is the most significant, followed by the sea area south of Honshu Island, while the Kuroshio current section of the East China Sea is the least obvious, and the velocity of Kuroshio current road increases from south to north in general. However, it does not increase gradually along the flow path, but shows that the large velocity zone in the flat DC section is interlaced with the low velocity zone in the curved and adjusted flow section. The multiyear mean data show that the velocity of current from the south of Shikoku Island to the west of Izu Islands is the highest. The monthly mean flow field over the years shows that the four months of Kuroshio flow path and flow axis change are important turning periods, while the four months of 1 / 4 / 7 / 10 are the representative months of each season. In winter, the Kuroshio current path and current axis are the most tortuous, with significant invasion to the marginal sea; in summer, the Kuroshio current path and current axis are most straight, with the north flow on the left; the transitional characteristics of spring and autumn are obvious. The results of FVCOM numerical simulation show that the simulation results are consistent with the observed results in general. The differences in details are as follows: the velocity of the simulation results is generally small and the flow amplitude is wide; The maximum velocity section of the simulation is located in the flow section east of the Fangtuo Peninsula, while the measured results are located in the section south of Shikoku Island to the west of the Idou Islands. The simulation results do not show that the Kuroshio current in the Tai Yu Strait is better than that in the Kuroshio Strait. Also did not better reflect the Kuroshio in the Yidou Ridge adjustment and so on.
【学位授予单位】：国家海洋局第一海洋研究所
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P731.27

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