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Shi NengShen Tough(Naming Institute of Meteorology, Naming 210044)and Cao Hongxing (China Academy of Meteorological Sciences, Beijing 100081)  
Investigation is carried out of winter Northern Hemisphere (NH) 100 hpa teleconnection, indicating the existence of a PNA pattern whose wavetrain well resembles that at 500 hpa level. During the climax of the EI Nino episode (winter), the 100 PNA becomes strong, a fact that manifests itself more clearly than at the 500 hpa level. Moreover, study is made of the anomaly in the tropical monthly windfield and mean circulation on a seasonal basis in a range of phases of the EI Nino event. Results show that the 100 hpa geopotential height is lowered on a large scale in the spring and previous winter with the event happening as compared to a La Nina year, wherewith diagnosis is performed of the 1991/1992EI Nino episode.
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