Article Type:
Research Article

Downstream Development of the Summertime Tropical Cyclone/Submonthly Wave Pattern in the Extratropical North Pacific

Ken-Chung Ko Department of Geography, National Kaohsiung Normal University, Kaohsiung, Taiwan

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Huang-Hsiung Hsu Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan

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Print Publication:
15 Apr 2010
DOI:
https://doi.org/10.1175/2009JCLI3248.1
Page(s):
2223–2229
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Abstract

The impact of tropical perturbation on the extratropical wave activity in the North Pacific in the submonthly time scale is demonstrated here. Previous studies identified a tropical cyclone (TC)/submonthly wave pattern, which propagated north-northwestward in the Philippine Sea and recurved in the oceanic region between Japan and Taiwan. This study found that, after the arrival of the TC/submonthly wave pattern at the recurving region, the eastward-propagating wave activity in the extratropical North Pacific was significantly enhanced. It is suggested that the TC/submonthly wave pattern, which is originated in the tropical western North Pacific, enhances the eastward energy propagation of Rossby wave–like perturbation in the extratropical North Pacific and may have an impact on the long-range weather predictability in the eastern North Pacific and western North America.

Corresponding author address: Dr. Huang-Hsiung Hsu, Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan. Email: hsu@atmos1.as.ntu.edu.tw

Abstract

The impact of tropical perturbation on the extratropical wave activity in the North Pacific in the submonthly time scale is demonstrated here. Previous studies identified a tropical cyclone (TC)/submonthly wave pattern, which propagated north-northwestward in the Philippine Sea and recurved in the oceanic region between Japan and Taiwan. This study found that, after the arrival of the TC/submonthly wave pattern at the recurving region, the eastward-propagating wave activity in the extratropical North Pacific was significantly enhanced. It is suggested that the TC/submonthly wave pattern, which is originated in the tropical western North Pacific, enhances the eastward energy propagation of Rossby wave–like perturbation in the extratropical North Pacific and may have an impact on the long-range weather predictability in the eastern North Pacific and western North America.

Corresponding author address: Dr. Huang-Hsiung Hsu, Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan. Email: hsu@atmos1.as.ntu.edu.tw

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