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基于卫星高度计和浮标漂流轨迹的海洋涡旋特征信息对比分析
赵新华,侯一筠,刘泽,庄展鹏,王凯迪
1.中国科学院海洋研究所;2.中国科学院大学;3.中国科学院海洋环流与波动重点实验室;4.青岛海洋科学与技术国家实验室 海洋动力过程与气候功能实验室;5.国家海洋局第一海洋研究所;6.中国海洋大学
摘要:
本文于Chelton高度计涡旋数据集和浮标漂流轨迹提取的涡旋结果,对于1993年至2015年的全球涡旋进行特征信息对比分析,结果表明,在全球范围内高度计涡旋数据集中的欧拉涡旋和浮标漂流轨迹提取的迹拉格朗日涡旋的配对成功率在空间分布上并不均衡,在南北纬20~60度之间配对成功率最高可达25%,而在低纬度区域内配对成功率不到10%。由于在低纬度地转效应并不显著,卫星高度计无法有效观测到涡旋,但通过浮标漂流轨迹识别出的拉格朗日涡旋却大量存在,这说明在低纬度区域内,采用漂流浮标手段对涡旋进行观测,能够有效地弥补卫星高度计识别涡旋的区域限制。进一步分析表明,总体而言,提取的欧拉涡旋半径要大于拉格朗日涡旋闭合回路半径,两种识别方法获得的涡旋(闭合回路)在大洋内部半径大致相当;在南北纬20度以内(特别是近赤道区域)、高纬度区域以及西边界流区域,欧拉涡旋半径是同期拉格朗日涡旋闭合回路半径的3倍或更多。此外,对配对涡旋的Rossby数分析表明,拉格朗日涡旋较小的闭合回路对应较大的平均相对涡度,表明浮标在被中尺度涡俘获后,更容易在相对涡度较大的地方(如中尺度涡中心、中尺度涡边缘等)形成闭合回路。
关键词:  Rossby数  涡旋配对成功率  涡旋半径  相对涡度
DOI:10.11693/hyhz20181100269
分类号:
基金项目:国家自然科学基金(41776020, 41630967, 41506021, 41421005)、国家自然科学基金委员会-山东省人民政府联合资助海洋科学研究中心项目(U1406401)、国家海洋局“全球变化与海气相互作用专项”(GASI-IPOVAI-01-06)
Information on the global features of eddies based on altimeter snapshot data and buoy drifting trajectory data
zhaoxinhua1,2,3, houyijun3,1,4,5, liuze3,1,4,5, zhuangzhanpeng6, wangkaidi7
1.Institute of Oceanology, Chinese Academy of Sciences;2.University of the Chinese Academy of Sciences;3.The Key Laboratory of Ocean Circulation and Waves;4.Qingdao National Laboratory for Marine Science and Technology, Laboratory for Ocean and Climate Dynamics;5.Chinese Academy of Sciences;6.State Oceanic Administration, The First Institute of Oceanography;7.Ocean University of China
Abstract:
Based on the altimeter eddy data set published by Chelton and the buoy drifting trajectory eddies from 1993 to 2015, in this paper, we match the Euler eddy recognized from satellite altimeter and Lagrange eddy from buoy drifting trajectory in the same period. Results from the paired-eddy indicates that the pairing success rate of the Euler eddies and the Lagrange eddies is not uniform in the spatial distribution. Between 20 and 60 degrees in both north and south latitudes, the eddy pairing success rate reaches 25%, but in the equatorial region, this value is less than 10%. Due to the Coriolis effect in the low latitude area is insignificant, the satellite altimeter observations could not be effective to the Euler eddy; however, the Lagrange eddies identified by the buoy trajectory are abundant, which indicates that the eddy observation by the drifting buoy in the low latitude region could effectively overcome the area limitation of the satellite altimeter observation. Upon further analysis, the Euler eddy radius (closed loop) is generally larger than that of the paired Lagrange eddy. The eddy radius obtained by the two identification methods is roughly equivalent inside the ocean, but between 20 degrees in the north and south of the equator (especially near the equatorial region), high latitude regions, and western boundary current regions, the Euler eddy radius is more than triple the radius of the simultaneous Lagrange eddy closed loop. In addition, when analyzing the global distribution of the ratio of the Euler eddy Rossby number and the corresponding Lagrange eddy Rossby number, it is observed that the closed loop with smaller Lagrange eddy corresponds to a larger average relative vorticity. That is, after the buoy is captured by the meso-scale vortex, it is easier to form a closed loop where the relative vorticity is larger (such as meso-scale eddy centers, mesos-cale eddy edges, etc.).
Key words:  Rossby number  eddy pairing success rate  eddy radius  relative vorticity
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