Observations of eddy fields in the northwest Atlantic and northwest Pacific by SEASAT altimeter data
Observations of eddy fields in the northwest Atlantic and northwest Pacific by SEASAT altimeter data
复制标题
利用SEASAT高度计数据对西北大西洋和西北太平洋涡流场进行观测
DOI：
10.1029/jc088ic03p01853
复制
发表时间：
1983
影响因子：
--
通讯作者：
Y. Ménard
中科院分区：
文献类型：
--
作者：
Y. Ménard
与涡流场活动相关的海平面变化可以根据高度测量数据的重复轨迹来计算，例如SEASAT 3天重复数据（1978年9月13日至10月10日）。如果我们考虑地转平衡中的涡流场，则地转关系给出了表面涡流速度。此外，可以在速度变化的准各向同性的假设下推导出涡动能的估计。该方法通过处理 SEASAT 数据用于西北大西洋和西北太平洋。在湾流和黑潮附近检测到海面地形的高度变化（高达 20 厘米）和高涡流动能（800--1600 厘米/sup 2//s/sup 2/）。观测到的海平面波动的功率谱给出的波长范围为 100 至 900 公里，时间尺度为 3 至 25 天。提出并讨论了海面地形变化和涡流动能图。
Sea level variability, related to the eddy field activity, can be calculated from repeating tracks of altimetric data, such as the SEASAT 3-day repeat data (September 13 to October 10, 1978). If we consider the eddy field in geostrophic balance, the geostrophic relation gives the surface eddy velocities. Also, an estimation of the eddy kinetic energy can be deduced under the assumption of quasi-isotropy of the velocity variability. This approach is used in the northwest Atlantic and northwest Pacific through the processing of SEASAT data. High variability of sea surface topography (up to 20 cm) and high eddy kinetic energy (800--1600 cm/sup 2//s/sup 2/) are detected in the vicinity of the Gulf Stream and the Kuroshio. Power spectra of the observed sea level fluctuations give wavelengths ranging from 100 to 900 km for time scales between 3 and 25 days. Maps of sea surface topography variability and eddy kinetic energy are presented and discussed.