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AGU: Geophysical Research Letters

 

Keywords

  • intraseasonal variation
  • total ozone
  • MJO

Index Terms

  • Atmospheric Composition and Structure: Middle atmosphere: constituent transport and chemistry
  • Biogeosciences: Climate dynamics
  • Biogeosciences: Restoration
  • Global Change: Climate variability

Abstract

Intraseasonal variations of the tropical total ozone and their connection to the Madden-Julian Oscillation

B. Tian

Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA

Y. L. Yung

Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, USA

D. E. Waliser

Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA

T. Tyranowski

Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, USA

L. Kuai

Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, USA

E. J. Fetzer

Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA

F. W. Irion

Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA

We investigate the intraseasonal (30–90 day) variations in satellite-observed tropical total ozone (O3) and their connection to the Madden-Julian Oscillation (MJO). Tropical total O3 intraseasonal variations are large (∼±10 DU) and comparable to those in annual and interannual time scales. These O3 anomalies are mainly evident in the subtropics over the Pacific and eastern; hemisphere and propagate slowly eastward (∼5 m s−1). The subtropical negative (positive) O3 anomalies are typically collocated with the subtropical upper troposphere anticyclones (cyclones) generated by equatorial MJO convection and flank or lie to the west of the equatorial enhanced (suppressed) MJO convection. The subtropical O3 are anti-correlated with geopotential height anomalies near the tropopause and thus mainly associated with the O3 variability in the stratosphere rather the troposphere. Over the equatorial regions, total O3 anomalies are small.

Received 23 January 2007; accepted 16 March 2007; published 21 April 2007.

Citation: Tian, B., Y. L. Yung, D. E. Waliser, T. Tyranowski, L. Kuai, E. J. Fetzer, and F. W. Irion (2007), Intraseasonal variations of the tropical total ozone and their connection to the Madden-Julian Oscillation, Geophys. Res. Lett., 34, L08704, doi:10.1029/2007GL029451.

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