Global circulation from SEASAT altimeter data
Global circulation from SEASAT altimeter data
复制标题
SEASAT 高度计数据的全球循环
DOI：
10.1080/15210608509379515
复制
发表时间：
1985
期刊：
影响因子：
1.6
通讯作者：
T. Engelis
中科院分区：
文献类型：
--
作者：
T. Engelis
摘要利用调整后的SEASAT高度计数据和GEML 2重力场，以1°为间隔得到一组时间平均海面高度，用于估计长波长静止海面地形。为了减少估计的海面地形中的能量泄漏，GEML 2场被Rapp 81重力场增强，以产生具有与海面高度一致的波长的大地水准面起伏。从海面高度中减去这些起伏，然后对所产生的差异进行滤波，以恢复最小波长为6 000公里、估计精度为20-25厘米的海面地形。这些估计与海洋学和其他卫星得出的结果吻合得很好。海流的方向可以用海面地形的球谐展开在全球范围内计算。这不仅是为了SEASAT/GEML 2估计，而且还使用最近的动态地形估计...
Abstract A set of time‐averaged sea surface heights at 1° intervals, derived from the adjusted SEASAT altimeter data, and the GEML2 gravity field are used to estimate the long‐wavelength stationary sea surface topography. In order to reduce the leakage of energy in the estimated sea surface topography, the GEML2 field is augmented by the Rapp81 gravity field to generate geoidal undulations with wavelengths consistent with the ones of sea surface heights. These undulations are subtracted from the sea surface heights, and the resulting differences are subjected to filtering in order to recover sea surface topography with minimum wavelengths of 6000 km and an estimated accuracy of 20–25 cm. These estimates agree well with oceanographic and other satellite‐derived results. The direction of current flow can be computed on a global basis using the spherical harmonic expansion of sea surface topography. This is done not only for the SEASAT/GEML2 estimates, but also using the recent dynamic topography estimates o...