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Deep ocean inertia‐gravity waves simulated in a high‐resolution global coupled atmosphere–ocean GCM
Author(s) -
Komori Nobumasa,
Ohfuchi Wataru,
Taguchi Bunmei,
Sasaki Hideharu,
Klein Patrice
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 - 10.1029/2007gl032807
Subject(s) - atmosphere (unit) , gravity wave , geology , wind wave , inertial wave , forcing (mathematics) , atmospheric sciences , climatology , geophysics , gravitational wave , meteorology , physics , wave propagation , mechanical wave , longitudinal wave , oceanography , quantum mechanics , astrophysics
In order to investigate the deep ocean inertia‐gravity waves, a high‐resolution global coupled atmosphere–ocean simulation is carried out with a coupling interval of 20 minutes. Large (∼10 −3 m s −1 ) root‐mean‐square variability of vertical velocity is found in middepths (2000–4000 m), which is not reported in previous studies using realistic ocean simulations. Horizontal distribution of the large variability roughly corresponds to the wintertime atmospheric storm tracks and is stretched equatorward due to β ‐dispersion in open ocean with some “shadow regions” behind the obstacles. Frequency spectrum of vertical velocity has strong peaks at around f and 2 f ( f is the local inertial period) in midlatitudes, and has additional peak at around (3/2) f or 3 f at some points. These results suggest necessity of re‐evaluation of wind‐induced near‐inertial energy with high‐frequency atmospheric forcing.