Tropical gravity-atmospheric long wave and the walker circulation |
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Authors: | Zhang Zhenyue |
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Institution: | Air Force Meteorological Institute, Nanjing |
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Abstract: | Orders of magnitude of terms related to earth’s rotation in linearized vorticity and divergence equations governing tropical
large-scale motion are analysed. It is discovered that βyD and βyξ are smaller by one order than βv and βu respectively and
then may be neglected. On this basis, tropical wave motions are di scussed. It is found that there exists a kind of gravity-atmospheric
long waves which is non-vorticit atmospheric long wave, whereas the Kelvin wave is essentially the gravity-atmospheric long
wave with its velocity being much lower than that of gravity. Computation shows that there also exists a kind of large-scale
slow waves whose moving speed is lower by one order of magnitude than that of Kelvin wave. Such slow wave is likely to be
the Walker Circulation.
Gao Hui has a share in part of the work.
Here non-vorticit means that the vertical component of vorticity in the atmosphere is equal to zero t m-porally and spatially. |
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Keywords: | |
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