The quasiquadrennial oscillation of Jupiter's equatorial stratosphere

A NEW 11-year record of Jupiter's stratospheric temperature1 shows an equatorial temperature oscillation with an apparent period of 4–5 years. Here we compare this oscillation to two long-period oscillations of zonal winds in the Earth's equatorial stratosphere, and propose that the same mechanism—forcing by the stresses of vertically propagating waves—is responsible for the oscillations on both planets. Jupiter's temperature oscillation has been observed for slightly more than two cycles and closely resembles the temperature signatures of the Earth's semiannual oscillation and quasibiennial oscillation. If the mechanisms responsible for these oscillations are indeed similar, Jupiter's oscillation indicates that there is significant vertical momentum transport due to equatorially trapped atmospheric waves, and it may provide a means for probing the poorly understood process of the generation of these waves by convection2,3.

[1]  T. Dunkerton.  Nonlinear Propagation of Zonal Winds in an Atmosphere with Newtonian Cooling and Equatorial Wavedriving , 1991 .

[2]  C. Leovy,et al.  Evolution of the Zonal Mean State in the Equatorial Middle Atmosphere during October 1978-May 1979 , 1986 .

[3]  M. Allison.  Planetary waves in Jupiter's equatorial atmosphere , 1983 .

[4]  R. Baron,et al.  Thermal Maps of Jupiter: Spatial Organization and Time Dependence of Stratospheric Temperatures, 1980 to 1990 , 1991, Science.

[5]  R. J. Reed.  A tentative model of the 26‐month oscillation in tropical latitudes , 1964 .

[6]  J. Holton,et al.  An Updated Theory for the Quasi-Biennial Cycle of the Tropical Stratosphere , 1972 .

[7]  F. M. Flasar,et al.  Mesoscale waves as a probe of Jupiter's deep atmosphere. , 1984 .

[8]  A. Mcewan,et al.  The Instability of a Forced Standing Wave in a Viscous Stratified Fluid: A Laboratory Analogue of .the Quasi-Biennial Oscillation , 1978 .

[9]  T. Dunkerton,et al.  A Two-Dimensional Model of the Quasi-Biennial Oscillation , 1985 .

[10]  J. Wallace.  General circulation of the tropical lower stratosphere , 1973 .

[11]  Kevin Hamilton,et al.  General Circulation Model Simulation of the Semiannual Oscillation of the Tropical Middle Atmosphere , 1988 .

[12]  K. Hamilton.  Mean Wind Evolution through the Quasi-Biennial Cycle in the Tropical Lower Stratosphere , 1984 .

[13]  C. Leovy,et al.  Estimation of the Kelvin Wave Contribution to the Semiannual oscillation. , 1988 .

[14]  T. Dunkerton,et al.  Climatology of the Equatorial Lower Stratosphere , 1985 .