期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 24, 页码 8918-8925出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL061773
关键词
ocean currents; GOCE; Ekman model; altimetry; Argo floats; surface drifters
资金
- GlobCurrent project from ESA
Accurate estimate of ocean surface currents is both a challenging issue and a growing end-users requirement. In this paper ocean currents are calculated at two levels (surface and 15m depth) as the sum of the geostrophic and Ekman components. First, a new, global, 1 degrees/4 Mean Dynamic Topography, called the CNES-CLS13 MDT, has been calculated and is now available for use by the oceanographic community. By exploiting information from surface drifters and Argo floats, the new MDT resolves spatial scales beyond the resolution permitted by the recent Gravity and Ocean Circulation Experiment (GOCE) geoid models (125km). Associated mean geostrophic speeds in strong currents are increased by 200% on average compared to GOCE-based mean currents. In addition, for the first time, a two-level, monthly, empirical Ekman model that samples a spiral-like behavior is estimated. We show that combining both pieces of information leads to improved ocean currents compared to other existing observed products.
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