NDLI: Development and propagation of equatorial waves

Content Provider	Springer Nature Link
Author	Li, Xiao fan Cho, Han Ru
Copyright Year	1997
Abstract	Development and propagation of equatorial waves are investigated with the model which includes convection-wave convergence feedback and convection-frictional convergence feedback. Two experiments with an initial Kelvin wave (Exp. K) and with an initial Rossby wave (Exp. R) are carried out. The equatorial waves in Exp. R grow much faster than those in Exp. K. The equatorial waves in both experiments follow zonal (eastward / westward) and meridional (poleward) propagation.The equatorial waves can be partitioned into two meridional modes using Parabolic Cylinder Function. An equator mode denotes a wave component with a positive precipitation center at the equator and an off-equator mode represents a wave component with positive precipitation centers off the equator. The equator mode dominates in Exp. K whereeas the off-equator mode dominates in Exp. R. The rapid wave growth in Exp. R is interpreted by analyzing the eddy available potential energy (EAPE) generation. Stronger off-equator mode in Exp. R obtains more EAPE through convection-frictional convergence feedback which results in more rapid wave growth.The relative vorticity tendency is determined by interactions between Earth’s vorticity and lower-troposphere convergence (divergence effect) and between the meridional gradient and lower-troposphere circulation (beta effect). The eastward and poleward propagation of equatorial waves is a result of the divergence effect, and the westward movement is caused by the beta effect.
Starting Page	323
Ending Page	338
Page Count	16
File Format	PDF
ISSN	02561530
Journal	Advances in Atmospheric Sciences
Volume Number	14
Issue Number	3
e-ISSN	18619533
Language	English
Publisher	Science Press
Publisher Date	1997-01-01
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Equatorial waves Development Propagation Eddy available potential energy Vorticity tendency Meteorology/Climatology Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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