Relation of the western North Pacific tropical cyclone genesis number to intraseasonal oscillation intensity

IF 0.8 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Terrestrial, Atmospheric and Oceanic Sciences Pub Date : 2021-01-01 DOI:10.3319/tao.2021.06.04.02

R. Wu, Xi Cao

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引用次数: 2

Abstract

The present study investigates the relationship of the year-to-year variations in the tropical cyclone (TC) genesis number over the western North Pacific (WNP) to the intensity of 10-20-day and 30-60-day intraseasonal oscillations (ISOs) during 1979 - 2018. It is found that the relationship between the TC genesis number and ISO intensity differs largely among the four quadrants of the WNP. The TC number in the southeast quadrant of the WNP has a close relation to the ISO intensity, but the relation is mostly weak for the TC number in the other three quadrants of the WNP. More (less) TC number in the southeast quadrant of the WNP corresponds to a stronger (weaker) ISOs. This indicates that stronger ISOs or longer active phases of the ISOs provide a favorable condition for formation of more TCs. This modulation of the ISO intensity on the TC genesis number suggests an indirect way for influence of seasonal mean background on the year-to-year variations in the WNP TC number through the ISO intensity. Further analysis suggests that this indirect way is likely a more important manner for the influence of seasonal mean background on the year-to-year variations in the genesis TC number over the WNP.

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北太平洋西部热带气旋成因数与季内振荡强度的关系

本文研究了1979 - 2018年北太平洋西部热带气旋(TC)发生数的年际变化与10-20天和30-60天季内振荡(iso)强度的关系。研究发现，在WNP的四个象限中，TC发生数与ISO强度之间的关系差异很大。东南象限的TC数与ISO强度关系密切，而其余三个象限的TC数与ISO强度关系较弱。WNP东南象限的TC数越多(越少)，对应的iso越强(越弱)。这表明，较强的iso或较长的iso活性相为更多tc的形成提供了有利条件。这种ISO强度对TC发生数的调制表明，季节平均背景通过ISO强度间接影响了WNP TC数的年际变化。进一步的分析表明，这种间接的方式可能是季节平均背景对WNP成因TC数年际变化影响的更重要的方式。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Terrestrial, Atmospheric and Oceanic Sciences 地学-地球科学综合

CiteScore

2.00

自引率

0.00%

发文量

审稿时长

4.5 months

期刊介绍： The major publication of the Chinese Geoscience Union (located in Taipei) since 1990, the journal of Terrestrial, Atmospheric and Oceanic Sciences (TAO) publishes bi-monthly scientific research articles, notes, correspondences and reviews in all disciplines of the Earth sciences. It is the amalgamation of the following journals: Papers in Meteorological Research (published by the Meteorological Society of the ROC) since Vol. 12, No. 2 Bulletin of Geophysics (published by the Institute of Geophysics, National Central University) since No. 27 Acta Oceanographica Taiwanica (published by the Institute of Oceanography, National Taiwan University) since Vol. 42.