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- Title
A geostrophic empirical mode based on altimetric sea surface height.
- Authors
Zhang, Lin; Sun, Che
- Abstract
Recent discovery of low-dimensional coherent structure in oceanic currents along with a new merged altimeter product called Absolute Dynamic Topography (ADT) makes it possible to derive subsurface ocean information from satellite remote sensing data. An altimetric geostrophic empirical mode ( η-GEM) is developed in this study by projecting hydrographic transects onto the ADT sea surface height coordinate, based on which the four-dimensional thermohaline and velocity structures of oceanic currents are reconstructed from satellite surface observations. In the WOCE/SR3 area, the η-GEM fields capture more than 95% of the total thermal variance. The GEM-derived flow has equivalent-barotropic structure and represents the velocity profile better than traditional dynamic modes. Comparison with mooring observations also demonstrates that the η-GEM provides good estimates of the deep thermohaline fields.
- Subjects
GEOSTROPHIC currents; EMPIRICAL research; ALTIMETERS; INFORMATION technology; REMOTE sensing; METEOROLOGICAL observations; BAROTROPY
- Publication
SCIENCE CHINA Earth Sciences, 2012, Vol 55, Issue 7, p1193
- ISSN
1674-7313
- Publication type
Article
- DOI
10.1007/s11430-011-4293-z