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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union

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doi:10.5194/npg-2016-59
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
08 Nov 2016
Review status
A revision of this discussion paper was accepted for the journal Nonlinear Processes in Geophysics (NPG) and is expected to appear here in due course.
Dynamics of the Hadley circulation in an axisymmetric model undergoing periodic change in forcing stratification
Tartaglione Nazario independent researcher
Abstract. The time-dependent response of the Hadley circulation to a periodic forcing is explored by using a simplified nonlinear axisymmetric model. Thermal forcing towards a given equilibrium potential temperature drives the model atmosphere. The vertical stratification of this temperature is forced to become periodically neutral with a period t0. Some simulations were performed with different values of t0, from 10 to 90 days, they exhibit a stronger circulation when comparing with constant thermal forcing experiment. As the period increases, a transition takes place from a stationary regime, obtained when forcing is constant, to a quasi-periodic regime, and to an intermittent regime. The stream-function response to periodic forcing is a quasi-periodic oscillation, with two main frequencies dominating, one with a period equal or close to that of forcing and another with a period that is half of the forcing period. The former is dominant for values of t0 larger than 30 days, whereas the latter is prevalent for t0 smaller than 30 days. The quasi-periodic oscillations obtained in this model might be associated with the quasi-periodic oscillations observed in the tropical regions. In this case the periodic charge and discharge of moisture in the tropical atmosphere may be linked to those oscillations. In the model, with forcing periods over 63 days the response of stream-function periodically enters in a sort of intermittent regime, with chaos appearing with high frequency oscillations, which are modulated by the slow timescale of forcing. The vertical viscosity plays a role in determining even the evolution of the Hadley circulation under the conditions established by the forcing.

Citation: Nazario, T.: Dynamics of the Hadley circulation in an axisymmetric model undergoing periodic change in forcing stratification, Nonlin. Processes Geophys. Discuss., doi:10.5194/npg-2016-59, in review, 2016.
Tartaglione Nazario
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
 
RC1: 'discussin comments', Anonymous Referee #1, 20 Dec 2016 Printer-friendly Version 
AC1: 'Reply', Nazario Tartaglione, 20 Dec 2016 Printer-friendly Version 
 
RC2: 'interacrive discussion', Anonymous Referee #1, 20 Dec 2016 Printer-friendly Version 
 
RC3: 'Referee review', Anonymous Referee #2, 22 Dec 2016 Printer-friendly Version 
 
AC2: 'Author response', Nazario Tartaglione, 24 Jan 2017 Printer-friendly Version Supplement 
Tartaglione Nazario
Tartaglione Nazario

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Short summary
This paper wants to show how the tropical circulation responds to changes of the vertical stratification of the imposed temperature that drives the model. These changes mimic the presence of water vapor cycles. Thus, for simplicity sake we impose a periodic change of this stratification with variable periods from 10 to 90 days. The model responds with quasi-periodic oscillations having two or more dominant frequencies. Long forcing time period a chaotic behavior start to appear cyclically.
This paper wants to show how the tropical circulation responds to changes of the vertical...
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