Abstract
The variations of tropical cyclone activity connected with the Antarctic oscillations (AAO) over the Northwestern Pacific was discussed. A huge anticyclonic circulation was developed for high AAO years in the Southern Hemisphere (SH), which lead to stronger trade winds in the SH subtropics and increase in convection activities along equatorial region. The difference of low-level vorticity and vertical wind shear between 200 hPa and 850 hPa for high AAO and low AAO was also discussed. Its is reported that the 850 hPa vorticity increase and vertical wind shear decrease during high AAO years, with increase in tropical convection.
| Original language | English |
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| Pages (from-to) | 4307-4312 |
| Number of pages | 6 |
| Journal | Bulletin of the American Meteorological Society |
| State | Published - 2004 |
| Event | Combined Preprints: 84th American Meteorological Society (AMS) Annual Meeting - Seattle, WA., United States Duration: 11 Jan 2004 → 15 Jan 2004 |