台湾以东中尺度涡的探测及其对黑潮入侵东海路径的影响

发布时间：2018-06-20 03:58

本文选题：台湾以东 + 中尺度涡　；参考：《中国科学院研究生院(海洋研究所)》2016年硕士论文

【摘要】：中尺度涡含有大约占海洋环流总动能的80%以上的巨大动能,能同时进行能量输送和物质传递,从而影响温、盐度及叶绿素等要素的分布。台湾以东海域的中尺度涡活跃多发,其中一部分会传播至黑潮主流区,从而影响黑潮的路径。而黑潮携带着大量的低纬度高温、高盐水,在流经台湾东北部海域时会入侵东海陆架,进而对东海环流系统和生态系统产生重要影响。因此,目前中尺度涡对黑潮的影响已引起了国内外海洋学家的重视,并成为海洋学界的一个研究热点。但应指出的是,目前关于台湾以东海域中尺度涡对黑潮影响的研究多是数值模式模拟的结果,而少有实测资料的验证。特别是,以往的研究大都关注单个涡旋对黑潮的影响,而很少研究多个涡旋对黑潮路径和入侵东海陆架的共同影响,况且有关中尺度涡对黑潮的影响机理也并不十分清楚。显然,开展中尺度涡对黑潮入侵东海路径的影响研究具有重要的科学意义和实用价值。本文基于1993~2013年间的AVISO卫星高度计资料,运用中尺度涡自动探测算法,对台湾以东及其邻近海域(120°E-126°E,17°N-27°N)的中尺度涡进行了识别及追踪,据此研究了各类中尺度涡旋对黑潮入侵东海路径的影响,得到的结论主要如下。1.在使用涡旋自动探测算法识别中尺度涡时,通过几组敏感性实验最终确定为:参数a=2和b=1。利用这些参数,可以较为准确地识别及追踪到中尺度涡旋。2.在本研究海域,中尺度涡数量存在着明显的季节变化。其中,春季(3-5月)是中尺度涡最活跃的季节,各月的涡旋都在115个以上,而在其它季节涡旋数量与之比较则较少,除了在个别月份(2月、7月和9月)的涡旋较多(在105-114个之间)外,其它月份的涡旋都较少,特别在12月涡旋最少,仅79个。气旋涡和反气旋涡的数量也有较明显的季节变化。在春、夏季气旋式涡旋要少于反气旋式涡旋,而在秋、冬季则多于反气旋式涡旋。3.不同类型的涡旋、单个涡旋或多个涡旋对黑潮路径及其向陆架入侵的影响皆有较大差异。单个反气旋式涡旋(2003年6月)使得台湾东北部的黑潮减弱,流轴西移,并出现入侵东海陆架现象;单个气旋式涡旋(2003年9月)将导致黑潮的流幅变窄,在台湾东北部流轴偏东,入侵陆架现象并不明显;一个较大尺度的气旋式涡旋由远而近进入黑潮主流区(2008年9-10)时,它对黑潮路径的影响有所不同。当涡旋距离黑潮主流区较远时,它对黑潮的影响较小,但当其靠近或进入黑潮主流区时,对黑潮的影响却较大,它使得黑潮的北上势力减弱、流幅变窄,并出现了黑潮入侵陆架现象;多个涡旋对黑潮路径的影响十分显著(2004年8-9月),它们使得黑潮在台湾以东的22.5?N附近分为两支:一支顺岸南下,而另一支则继续北上,并发生了黑潮入侵陆架现象。
[Abstract]:Mesoscale vortices contain more than 80% of the huge kinetic energy of the total kinetic energy of the ocean circulation, which can simultaneously carry energy transport and material transfer, thus affecting the distribution of temperature, salinity and chlorophyll. The mesoscale vortices in the East Sea area of Taiwan are active, some of which will spread to the mainstream of the Kuroshio, thus affecting the path of the Kuroshio. And the Kuroshio With a large number of low latitudes and high salinity, high water salt will invade the East China Sea shelf when it flows through the northeast of Taiwan, and then have an important influence on the circulation system and ecosystem in the East China Sea. Therefore, the influence of the mesoscale eddy on the black tide has attracted the attention of the marine scientists both at home and abroad, and has become a research hotspot in the oceanographic field. At present, the research on the influence of the mesoscale eddy on the Kuroshio in the east of Taiwan is mostly the result of numerical model simulation, but few of the measured data are verified. In particular, most of the previous studies have paid much attention to the influence of the single vortex on the Kuroshio, but seldom study the common influence of the multiple vortices on the Kuroshio path and the invasion of the East China Sea shelf. The influence mechanism of the mesoscale vortex on the Kuroshio is not very clear. Obviously, it is of great scientific significance and practical value to study the influence of the mesoscale vortex on the intrusion of the Kuroshio on the East China Sea path. Based on the data of the AVISO altimeter during the period of 1993~2013, the mesoscale eddy auto detection algorithm is applied to the East and adjacent sea area of Taiwan. The mesoscale vortices of 120 degree E-126 E and 17 degree N-27 N are identified and traced. According to this, the influence of various mesoscale vortices on the path of the Kuroshio invasion of the East China Sea is studied. The main conclusions are as follows:.1. is finally determined by several groups of sensitivity experiments when using the automatic vortex detection algorithm to identify the mesoscale vortices. The parameters a=2 and b=1. are used to use these parameters. The number of mesoscale vortices can be identified and tracked more accurately in this study area. The number of mesoscale vortices has obvious seasonal variations. Among them, spring (3-5 months) is the most active season for mesoscale vortices, and the vortices in each month are more than 115, while the number of vortices in other seasons is less than that in other seasons, except in a few months (February, 7). There are more vortices in month and September (between 105-114) than in other months, especially in December, only 79. The number of cyclone vortices and anti gas vortices also have obvious seasonal variations. In spring, the cyclone vortex is less than the anticyclone vortex, and in autumn, in winter, more than the anticyclonic vortex.3. in different types. Vortices, single vortices or multiple vortices have great differences in the path of the Kuroshio and its invasion to the continental shelf. Single anticyclonic vortices (June 2003) weaken the Kuroshio in northeastern Taiwan, move westward and invade the East China Sea shelf, and a single cyclonic vortex (September 2003) will lead to the narrowing of the Kuroshio flow, in the northeast of Taiwan. When a large scale cyclone has entered the main area of the Kuroshio (2008 9-10), it has different influence on the Kuroshio path. When the vortex is far away from the mainstream of the Kuroshio, it has little influence on the Kuroshio, but when it is near or entering the main area of the Kuroshio, the shadow of the Kuroshio is the shadow of the Kuroshio. Loud, it makes the North upper forces of the Kuroshio weakened, the flow narrow and the Kuroshio invasion of the shelf; many vortices have a significant impact on the path of the Kuroshio (8-9 months of 2004), which make the Kuroshio two branches near the 22.5? N east of Taiwan: one along the bank, and the other on the north, and the Kuroshio invasion of the land. Frame phenomenon.
【学位授予单位】：中国科学院研究生院(海洋研究所)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P731.2

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