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Atmosphere 2018, 9(8), 292; https://doi.org/10.3390/atmos9080292

A Mechanism of the Interdecadal Changes of the Global Low-Frequency Oscillation

1
Department of Atmospheric Sciences, Yunnan University, Kunming 650000, China
2
Plateau Atmospheric and Environment Laboratory of Sichuan Province, College of Atmospheric Science, Chengdu University of Information Technology, Chengdu 610000, China
3
Center for Monsoon System Research and LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, and University of Chinese Academy of Sciences, Beijing 10000, China
*
Author to whom correspondence should be addressed.
Received: 28 May 2018 / Revised: 27 June 2018 / Accepted: 6 July 2018 / Published: 27 July 2018
(This article belongs to the Section Climatology and Meteorology)
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Abstract

Based on the National Center for Environmental Prediction/National Center for Atmospheric Research reanalysis dataset from 1948 to 2009, this study reveals that global low-frequency oscillation features two major temporal bands. One is a quasi-60-day period known as the intraseasonal oscillation (ISO), and the other is a quasi-15-day period known as the quasi-biweekly oscillation (QBWO). After the mid-1970s, both the ISO and QBWO become intensified and more active, and these changes are equivalently barotropic. The primitive barotropic equations are adopted to study the involved mechanism. It reveals that the e-folding time of the least stable modes of both the ISO and QWBO becomes shorter if the model is solved under the atmospheric basic state after the mid-1970s than if solved under the basic state before the mid-1970s. This result suggests that the atmospheric basic flow after the mid-1970s facilitates a more rapid growth of the ISO and QBWO, and thereby an intensification of the low-frequency oscillations at the two bands. View Full-Text
Keywords: low-frequency oscillation; interdecadal change; atmospheric basic flow; e-folding time; barotropic primitive equations low-frequency oscillation; interdecadal change; atmospheric basic flow; e-folding time; barotropic primitive equations
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Yang, R.; Chen, Q.; Liu, Y.; Wang, L. A Mechanism of the Interdecadal Changes of the Global Low-Frequency Oscillation. Atmosphere 2018, 9, 292.

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