What is recorded here?
Matsuno solved a simplified rotating-fluid model to connect equatorial gravity and Rossby waves, distinguish a Kelvin-like branch and calculate one bounded stationary forced response. Near the equator, the rotational influence changes sign across a narrow belt. Matsuno kept that variation in a linear shallow-layer model and used Hermite-shaped modes to organize the waves that can travel along it. The lowest westward mode changes continuously between gravity-like and Rossby-like behavior, so the usual assumption of a clean frequency gap fails for that mode. A separate Kelvin-like solution travels eastward with no meridional velocity. In a damped example with alternating sources and sinks, the model produces a strong equatorial current and split pressure cells. The paper proposes ways to understand real atmosphere and ocean motions, while explicitly requiring observational tests and preserving earlier trapping work and Rosenthal’s overlapping result.
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Scientific scope
Linear small perturbations of a homogeneous incompressible hydrostatic free-surface layer, constant mean depth, equatorial beta-plane f=beta*y, longitudinal harmonic waves and decay at meridional infinity. For n>=1 three branches; n=0 requires excluding a spurious cubic root and has a mixed westward branch; the v=0 Kelvin-like branch is separate. Finite spherical boundaries and near-equator/low-frequency approximations matter. Section 8 forced circulation uses periodic mass sources/sinks and equal linear damping; this is not free-wave observation or a universal heating response. Section 9 vertical-mode extension requires stable stratification, separability and suitable eigenfunctions/boundaries; completeness is conditional there. Prior trapping work and Rosenthal 1965 overlap are acknowledged. Original 41–42 explicitly leaves actual atmospheric/oceanic realization to testing. incomplete equation glyphs and uninspected figures prevent exact formula certification. No independent reconstruction, forecast skill test, nonlinear stability or observational discovery claimed.
Read the original work
- Matsuno, Quasi-Geostrophic Motions in the Equatorial Area (1966), original pp.25–43
- J-STAGE publisher metadata, DOI10.2151/jmsj1965.44.1_25
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People and systems
Taroh Matsuno
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English catalogue narrative
Matsuno: a wave framework for the equator
Matsuno solved a simplified rotating-fluid model to connect equatorial gravity and Rossby waves, distinguish a Kelvin-like branch and calculate one bounded stationary forced response.
Near the equator, the rotational influence changes sign across a narrow belt. Matsuno kept that variation in a linear shallow-layer model and used Hermite-shaped modes to organize the waves that can travel along it. The lowest westward mode changes continuously between gravity-like and Rossby-like behavior, so the usual assumption of a clean frequency gap fails for that mode. A separate Kelvin-like solution travels eastward with no meridional velocity. In a damped example with alternating sources and sinks, the model produces a strong equatorial current and split pressure cells. The paper proposes ways to understand real atmosphere and ocean motions, while explicitly requiring observational tests and preserving earlier trapping work and Rosenthal’s overlapping result.
Scientific scope
Linear small perturbations of a homogeneous incompressible hydrostatic free-surface layer, constant mean depth, equatorial beta-plane f=beta*y, longitudinal harmonic waves and decay at meridional infinity. For n>=1 three branches; n=0 requires excluding a spurious cubic root and has a mixed westward branch; the v=0 Kelvin-like branch is separate. Finite spherical boundaries and near-equator/low-frequency approximations matter. Section 8 forced circulation uses periodic mass sources/sinks and equal linear damping; this is not free-wave observation or a universal heating response. Section 9 vertical-mode extension requires stable stratification, separability and suitable eigenfunctions/boundaries; completeness is conditional there. Prior trapping work and Rosenthal 1965 overlap are acknowledged. Original 41–42 explicitly leaves actual atmospheric/oceanic realization to testing. incomplete equation glyphs and uninspected figures prevent exact formula certification. No independent reconstruction, forecast skill test, nonlinear stability or observational discovery claimed.
People and systems
Taroh Matsuno