Abstract
The convective activities related to madden-julian oscillation (MJO) which modulates the arctic oscillation (AO), are discussed. MJO indices (MJOI) are determined by the extended empirical orthogonal function (EEOF) analysis of penated 200-hPa velocity potential anomalies equatorward of 30°N during ENSO-neutral and weak ENSO winters. AO indices (AOI) are determined by leading principal component of monthly mean sea level pressure (SLP). It is found that the AO shows strong variability in wintertime, because AO activity is related to polar vortex, and MJO also represents strong variability in wintertime, but the strongest period is from March to May (MAM).
| Original language | English |
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| Pages (from-to) | 4287-4289 |
| Number of pages | 3 |
| 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 |