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The tilt of a 12‐hourly atmospheric tidal wave
Author(s) -
Thrane P.
Publication year - 1955
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49708134703
Subject(s) - perturbation (astronomy) , tilt (camera) , adiabatic process , physics , equator , tidal waves , atmosphere (unit) , mechanics , inviscid flow , atmospheric sciences , meteorology , geodesy , geology , geophysics , geometry , latitude , mathematics , quantum mechanics , thermodynamics
Forced oscillations of 12‐hr period, stationary relative to the sun, are considered in a model atmosphere enclosed in a canal coincident with the earth's equator. Two‐dimensional, inviscid motion is assumed. The study is based on equations of perturbation containing linear terms and second‐order product terms. The oscillations are excited thermally and gravitationally. In the general case such waves have a variation of phase with height, a ‘tilt’, and this is necessary in order that a vertical transport of energy may take place. In non‐tilting waves no tidal energy can be supplied to the model atmosphere. An adiabatic wave can have no tilt. The method of perturbation is applicable to the tilting waves only for a limited time interval.