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ENSO influence on QBO modulations of the tropical tropopause

Citation

Yuan, W and Geller, MA and Love, PT, ENSO influence on QBO modulations of the tropical tropopause, Quarterly Journal of the Royal Meteorological Society, 140, (682) pp. 1670-1676. ISSN 0035-9009 (2014) [Refereed Article]

Copyright Statement

Copyright 2013 Royal Meteorological Society

DOI: doi:10.1002/qj.2247

Abstract

We examine the El Niño–Southern Oscillation (ENSO) influence on the quasi-biennial oscillation (QBO) modulation of the cold-point tropopause (CPT) temperatures. An analysis of approximately five decades (in most cases 1950s to near-present) of radiosonde data from 10 near-equatorial stations, distributed along the Equator, shows that the ENSO influence on the QBO is quite zonally symmetric. At all stations analyzed, the QBO has larger amplitude and longer period during La Niña conditions than during El Niño over this total period. We also show that as a consequence of the ENSO influences on QBO periods and amplitudes, the differences between the warmer CPT temperatures during QBO westerly shear conditions and colder temperatures during QBO easterly shear conditions are larger during La Niña than during El Niño for all stations for the entire period considered here. This strengthens earlier findings that the greatest dehydration of air entering the stratosphere from the troposphere occurs during the winter under La Niña and easterly QBO conditions. In addition, stratosphere/troposphere wind and temperature profiles are derived to establish the degree of QBO downward penetration necessary to influence zonal winds and temperatures in the upper troposphere.

Item Details

Item Type:Refereed Article
Keywords:Quasi Biennial Oscillation, El Nino Southern Oscillation, radiosonde, tropopause
Research Division:Earth Sciences
Research Group:Atmospheric Sciences
Research Field:Tropospheric and Stratospheric Physics
Objective Division:Environment
Objective Group:Atmosphere and Weather
Objective Field:Atmospheric Processes and Dynamics
Author:Love, PT (Dr Peter Love)
ID Code:121595
Year Published:2014
Web of Science® Times Cited:7
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2017-10-04
Last Modified:2017-11-10
Downloads:0

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