TY - JOUR T1 - Do altimeter wavenumber spectra agree with the interior or surface quasigeostrophic theory? A1 - Le Traon,Pierre-Yves A1 - Klein,Patrice A1 - Hua,Bach-Lien A1 - Dibarboure,G AD - IFREMER, Ctr Brest, F-29280 Plouzane, France. AD - CLS Space Oceanog Div, St Agne, France. UR - https://archimer.ifremer.fr/doc/00000/4118/ DO - 10.1175/2007JPO3806.1 N2 - In high-eddy-energy regions, it is generally assumed that sea level wavenumber spectra compare well with quasigeostrophic (QG) turbulence models and that spectral slopes are close to the expected k(-5) law. This issue is revisited here. Sea level wavenumber spectra in the Gulf Stream, Kuroshio, and Agulhas regions are estimated using the most recent altimeter datasets [the Ocean Topography Experiment (TOPEX)/ Poseidon, Jason-1, the Environmental Satellite (Envisat), and the Geosat Follow-On]. The authors show that spectral slopes in the mesoscale band are significantly different from a k(-5) law, in disagreement with the QG turbulence theory. However, they very closely follow a k(-11/3) slope, which indicates that the surface quasigeostrophic theory (SQG) is a much better dynamical framework than the QG turbulence theory to describe the ocean surface dynamics. Because of the specific properties of the SQG theory, these results offer new perspectives for the analysis and interpretation of satellite data. Y1 - 2008/05 PB - American Meteorological Society JF - Journal of Physical Oceanography SN - 0022-3670 VL - 38 IS - 5 SP - 1137 EP - 1142 ID - 4118 ER -