Displacements of the North Circumpolar Vortex during El Niño, 1963–83

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Abstract
During the pronounced 1982–83 El Niño, the 300 mb north circumpolar vortex was displaced further toward Japan (from its mean seasonal locations) than observed since the beginning of the vortex record in 1963. However, during the strong 1972–73 El Niño, the vortex was displaced toward the 180th meridian, and during the weaker 1965–66 El Niño toward the eastern Pacific, so that vortex displacements are not indicated to have been the same for different El Niño episodes. Based on the full 21-year record, the vortex has tended to be displaced toward 90°W when sea surface temperature (SST) in the region 0°–10°S, 180–80°W was above average, but toward the 180th meridian when the magnitude of SST deviation from average is considered. Abstract During the pronounced 1982–83 El Niño, the 300 mb north circumpolar vortex was displaced further toward Japan (from its mean seasonal locations) than observed since the beginning of the vortex record in 1963. However, during the strong 1972–73 El Niño, the vortex was displaced toward the 180th meridian, and during the weaker 1965–66 El Niño toward the eastern Pacific, so that vortex displacements are not indicated to have been the same for different El Niño episodes. Based on the full 21-year record, the vortex has tended to be displaced toward 90°W when sea surface temperature (SST) in the region 0°–10°S, 180–80°W was above average, but toward the 180th meridian when the magnitude of SST deviation from average is considered.

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