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Atmosphere 2018, 9(5), 158; https://doi.org/10.3390/atmos9050158

Multidecadal Variability in the Subseasonal Peak of Low-Level Convergence over the Pacific Warm Pool

1
Department of Plants, Soils, and Climate, Utah State University, Logan, UT 84322, USA
2
Utah Climate Center, Utah State University, Logan, UT 84322, USA
*
Author to whom correspondence should be addressed.
Received: 6 February 2018 / Revised: 20 April 2018 / Accepted: 21 April 2018 / Published: 24 April 2018
(This article belongs to the Special Issue Monsoons)
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Abstract

In the Western North Pacific (WNP), the atmospheric low-level convergence is one of the main factors that influences the genesis of tropical cyclones (TC). It has been observed that the timing of the seasonal maxima in the low-level convergence and TC genesis has shifted since the mid-1990s from mid-August to late-July, with this shift having also affected the number of TC. A multidecadal frequency of 20 years was revealed in the timing variation of the tropical intraseasonal oscillation (ISO) in the Western Pacific, in which a weak WNP low-level convergence in spring may trigger an advanced ISO phase in summer and vice versa. The present diagnostic analysis does not identify any prominent oceanic variations associated with these multidecadal variations in the summer ISO or in the spring setup of the ISO. The atmospheric circulation does show an anomaly, which suggests an intensified extension of the subtropical high. The possible mechanism may be related to stochastic low-frequency variability of the atmosphere, which acts to influence the seasonal evolution of the WNP low-level convergence. View Full-Text
Keywords: East Asian summer monsoon; multidecadal variability; low-level convergence East Asian summer monsoon; multidecadal variability; low-level convergence
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Lin, Y.-H.; Wang, S.-Y.S. Multidecadal Variability in the Subseasonal Peak of Low-Level Convergence over the Pacific Warm Pool. Atmosphere 2018, 9, 158.

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