EL NINO EPISODE-RELATED NH 100 hpa CIRCULATION ANOMALY

Shi Neng; Shen Tough; Cao Hongxing

Abstract:

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 1991/1992 EI Nino episode.

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Shi Neng, Shen Tough, Cao Hongxing. EL NINO EPISODE-RELATED NH 100 hpa CIRCULATION ANOMALY [J]. Journal of Tropical Meteorology, 1995, 1(1): 23-33.

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EL NINO EPISODE-RELATED NH 100 hpa CIRCULATION ANOMALY

Naning Institute of Meteorology, Naming 210044

China Academy of Meteorological Sciences, Beijing 100081

Received Date: 1993-12-14

Rev Recd Date: 1994-04-28

Abstract: 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 1991/1992 EI Nino episode.

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Reference (8)

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EL NINO EPISODE-RELATED NH 100 hpa CIRCULATION ANOMALY

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