Remember Me
Or use your Academic/Social account:


Or use your Academic/Social account:


You have just completed your registration at OpenAire.

Before you can login to the site, you will need to activate your account. An e-mail will be sent to you with the proper instructions.


Please note that this site is currently undergoing Beta testing.
Any new content you create is not guaranteed to be present to the final version of the site upon release.

Thank you for your patience,
OpenAire Dev Team.

Close This Message


Verify Password:
Verify E-mail:
*All Fields Are Required.
Please Verify You Are Human:
fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Nazario, Tartaglione (2016)
Languages: English
Types: Article
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.
  • No references.
  • No related research data.
  • No similar publications.

Share - Bookmark

Cite this article

Collected from