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Explaining the global distribution of peak‐spectrum variability of sea surface height
Author(s) -
Lin Xiaopei,
Yang Jiayan,
Wu Dexing,
Zhai Ping
Publication year - 2008
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2008gl034312
Subject(s) - rossby wave , sea surface height , rossby radius of deformation , geology , forcing (mathematics) , latitude , atmospheric wave , atmospheric sciences , southern hemisphere , northern hemisphere , climatology , merge (version control) , physics , geophysics , wave propagation , sea surface temperature , geodesy , gravity wave , quantum mechanics , computer science , information retrieval
A 14‐year satellite observation of sea surface height (SSH) reveals an interesting pattern. Along any latitude, there is a frequency at which the SSH power spectrum peaks, regardless of which hemisphere or oceanic basin. This peak‐spectrum frequency is nearly identical to the critical frequency at which the zonal energy propagation of Rossby waves becomes stagnant. The interior ocean adjusts to atmospheric forcing by radiating energy away through Rossby waves. There are two distinct groups of Rossby waves, long ones carry the energy to the west while short ones send the energy to the east. At the critical frequency, these two waves merge and their zonal energy propagation becomes stagnant. Consequently, the energy from atmospheric forcing may accumulate in the ocean interior, and thus result in a spectrum peak.