Super-rotation independent of horizontal diffusion reproduced in a Venus GCM.
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| Title: | Super-rotation independent of horizontal diffusion reproduced in a Venus GCM. |
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| Authors: | Sugimoto, Norihiko, Fujisawa, Yukiko, Komori, Nobumasa, Kashimura, Hiroki, Takagi, Masahiro, Matsuda, Yoshihisa |
| Source: | Earth, Planets & Space; 3/24/2023, Vol. 75 Issue 1, p1-9, 9p |
| Subject Terms: | GENERAL circulation model, VENUS (Planet), VENUSIAN atmosphere, ANGULAR momentum (Mechanics) |
| Abstract: | Horizontal diffusion and resolution are important factors to generate and maintain the super-rotation in the general circulation model (GCM) because waves which transport angular momentum are sensitive to them. Here, we investigated how the super-rotation depends on the magnitude of horizontal hyper diffusion using a Venus atmospheric GCM with medium and high resolutions. In both the runs, we found a parameter range where the structure of fully developed super-rotation is almost independent of the magnitude of horizontal diffusion. Spectral analysis shows that unrealistically strong super-rotation is developed when medium-scale disturbances are dissipated by stronger horizontal diffusion. On the other hand, artificially weak super-rotation is also realized because spurious small-scale disturbances are accumulated when the horizontal diffusion is too weak. [ABSTRACT FROM AUTHOR] |
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| Database: | Complementary Index |
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