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

IOCAS-IR > 海洋环流与波动重点实验室

	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
	程建婷1,2
学位类型	硕士
导师	尹宝树 ; 杨德周
	2016-05-17
学位授予单位	中国科学院大学
学位授予地点	北京
学位专业	物理海洋学
关键词	台湾以东中尺度涡黑潮入侵路径
其他摘要	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。; The mesoscale eddy contains huge kinetic energy which is almost more than about 80% of the whole kinetic energy of the ocean circulation at the same time, and it will transfer energy as well as transfer mass. The mesoscale eddy will influence the distribution of elements, such as temperature, salinity and chlorophyll. Meanwhile mesoscale eddies at the east of Taiwan in the northwest Pacific Ocean are quite active. Some of the mesoscale eddies which originate from the deep ocean will spread to the west and then enter into the range of Kuroshio mainstream, thereby affect it. Kuroshio which is carrying the high temperature and high salinity water of low latitudes transmit the matter and energy of the Pacific, invade the East China Sea shelf in the northeast of Taiwan, and influence the East China Sea circulation system and ecosystem further. In this paper 21 years AVISO satellite altimeter data in used, and the area 120 ° E - 130 ° E, 17 ° N - 27 ° N is selected as the study area. The mesoscale vortex automatic detection algorithm is used to detect and track mesoscale eddies in the east of Taiwan. Study the effect of mesoscale eddies on the path of the Kuroshio intrusion in the East China Sea. The following conclusions are obtained. 1. Through several groups of sensitivity tests, the parameters are ultimately determined that a = 2 and b = 1. In this case the vorte automatic detection algorithm is able to more accurately identify and track the mesoscale vortex. 2. In the study area the number of eddies have obvious seasonal variation characteristics. The number of eddies in spring is larger than any other season, and the number of vortex in each mouth is more than 115. In February, July and September there are a little bit more eddies which is between 105 to 114, meanwhile the number of eddies in December(79) is the least. In the study area the number of cyclonic eddies is smaller than anticyclonic eddies in the spring and summer and larger in autumn and winter. 3. Different type of eddies, single vortex or multiple vortexes have big difference of impact on the path of Kuroshio and intrusion to the shelf. With the examples in 2003, find out that when the anticyclonic eddies are transported to the scope of Kuroshio, the path of Kuroshio will weaken and its velocity of will increase. Meanwhile when the cyclonic eddies are transported to the scope of Kuroshio, the Kuroshio intrusion will enhance and the velocity of Kuroshio will decrease. In 2008 when large scale range of mesoscale vortex appeared in the scope of Kuroshio mainstream, northeast of Taiwan Kuroshio turn around about 30° anticlockwise, makes the Kuroshio directly onto the East China Sea shelf. Particularly there are multiple vortexes existing in the area of east of Taiwan in the summer of 2004. At the same time Kuroshio spindle in Luzon strait had an evident movement to east and invasion path of Kuroshio to the east China changed dramatically.The mesoscale eddy contains huge kinetic energy which is almost more than about 80% of the whole kinetic energy of the ocean circulation at the same time, and it will transfer energy as well as transfer mass. The mesoscale eddy will influence the distribution of elements, such as temperature, salinity and chlorophyll. Meanwhile mesoscale eddies at the east of Taiwan in the northwest Pacific Ocean are quite active. Some of the mesoscale eddies which originate from the deep ocean will spread to the west and then enter into the range of Kuroshio mainstream, thereby affect it. Kuroshio which is carrying the high temperature and high salinity water of low latitudes transmit the matter and energy of the Pacific, invade the East China Sea shelf in the northeast of Taiwan, and influence the East China Sea circulation system and ecosystem further. In this paper 21 years AVISO satellite altimeter data in used, and the area 120 ° E - 130 ° E, 17 ° N - 27 ° N is selected as the study area. The mesoscale vortex automatic detection algorithm is used to detect and track mesoscale eddies in the east of Taiwan. Study the effect of mesoscale eddies on the path of the Kuroshio intrusion in the East China Sea. The following conclusions are obtained. 1. Through several groups of sensitivity tests, the parameters are ultimately determined that a = 2 and b = 1. In this case the vorte automatic detection algorithm is able to more accurately identify and track the mesoscale vortex. 2. In the study area the number of eddies have obvious seasonal variation characteristics. The number of eddies in spring is larger than any other season, and the number of vortex in each mouth is more than 115. In February, July and September there are a little bit more eddies which is between 105 to 114, meanwhile the number of eddies in December(79) is the least. In the study area the number of cyclonic eddies is smaller than anticyclonic eddies in the spring and summer and larger in autumn and winter. 3. Different type of eddies, single vortex or multiple vortexes have big difference of impact on the path of Kuroshio and intrusion to the shelf. With the examples in 2003, find out that when the anticyclonic eddies are transported to the scope of Kuroshio, the path of Kuroshio will weaken and its velocity of will increase. Meanwhile when the cyclonic eddies are transported to the scope of Kuroshio, the Kuroshio intrusion will enhance and the velocity of Kuroshio will decrease. In 2008 when large scale range of mesoscale vortex appeared in the scope of Kuroshio mainstream, northeast of Taiwan Kuroshio turn around about 30° anticlockwise, makes the Kuroshio directly onto the East China Sea shelf. Particularly there are multiple vortexes existing in the area of east of Taiwan in the summer of 2004. At the same time Kuroshio spindle in Luzon strait had an evident movement to east and invasion path of Kuroshio to the east China changed dramatically.
学科领域	海洋科学 ; 物理海洋学
语种	中文
文献类型	学位论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/116999
专题	海洋环流与波动重点实验室
作者单位	1.中国科学院海洋研究所 2.中国科学院大学
第一作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	程建婷. 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[D]. 北京. 中国科学院大学,2016.

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