Westward Extension of North Pacific Subtropical High in Summer

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概要

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• The basic features of the North Pacific subtropical anticyclone in summer are studied using the European Center for Medium Range Weather Forecasts(ECMWF)Re-Analysis data for the period(1979-1993). It has been shown that the North Pacific subtropical high displays substantial interannual variability at its western edge. Further analysis indicates a significant relationship between the zonal variation of the subtropical high, and the variation in the intensity of atmospheric convection over the warm pool. The Stronger(weaker)convection over the warm pool is associated with more eastward(westward)position of the western Pacific subtropical high. The UK Universities' Global Atmospheric Modelling Programme General Circulation Model(UGAMPGCM)is used to examine the influence of the local SST anomalies, and the associated anomalous convection over the tropical western Pacific warm pool on the zonal displacement of the North Pacific subtropical high. The model results show that the suppressed atmospheric convection caused by lower SSTs in the warm pool results in anomalous anticyclonic circulation in lower level over the subtropical western Pacific, and westward extension of the subtropical high. The results are consistent with the composite results based on the reanalysis data, and imply the SST anomalies off-equator over the western Pacific play an important role in the zonal shift of the North Pacific subtropical high in summer. Despite the fact of good agreements in many aspects between the model simulations and composite analyses based on observation, there are some differences between the two especially in terms of upper-level extratropical circulation anomalies over East Asia.

• 社団法人日本気象学会の論文
• 2001-12-25

著者

• Lu Riyu

  Institute Of Atmospheric Physics Chinese Academy Of Science

• Dong Buwen

  CGAM, Department of Meteorology, University of Reading

• Dong Buwen

  Cgam Department Of Meteorology University Of Reading

関連論文

• Associations among the Components of the East Asian Summer Monsoon System in the Meridional Direction
• Interannual Variability of the Summertime North Pacific Subtropical High and its Relation to Atmospheric Convection over the Warm Pool
• External and Internal Summer Atmospheric Variability in the Western North Pacific and East Asia
• Westward Extension of North Pacific Subtropical High in Summer
• The Climatological Rossby Wave Source over the STCZs in the Summer Northern Hemisphere

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