Korty, Robert L. and Schneider, Tapio (2008) Extent of Hadley circulations in dry atmospheres. Geophysical Research Letters, 35 (23). L23803. ISSN 0094-8276 http://resolver.caltech.edu/CaltechAUTHORS:KORgrl08
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The subtropical terminus of the Hadley circulation is interpreted as the latitude poleward of which vertical wave activity fluxes (meridional eddy entropy fluxes) become sufficiently deep to reach the upper troposphere. This leads to a sign change of the upper-tropospheric divergence of meridional wave activity fluxes (convergence of meridional eddy angular momentum fluxes) and marks the transition from the tropical Hadley cell to the extratropical Ferrel cell. A quantitative formulation for determining the depth of vertical wave activity fluxes and thus the terminus of the Hadley circulation is proposed based on the supercriticality, a measure of the slope of isentropes. The supercriticality assumes an approximately constant value at the terminus of the Hadley circulation in a series of simulations with an idealized dry general circulation model. However, it is unclear how to generalize this supercriticality-based formulation to moist atmospheres.
|Additional Information:||Copyright 2008 by the American Geophysical Union. Received 28 August 2008; revised 21 October 2008; accepted 27 October 2008; published 2 December 2008. This work was supported by a David and Lucile Packard Fellowship and by the National Science Foundation (grant ATM-0450059). Three anonymous reviewers provided very helpful comments.|
|Subject Keywords:||Hadley circulation|
|Official Citation:||Korty, R. L., and T. Schneider (2008), Extent of Hadley circulations in dry atmospheres, Geophys. Res. Lett., 35, L23803, doi:10.1029/2008GL035847.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Archive Administrator|
|Deposited On:||08 Jan 2009 21:58|
|Last Modified:||26 Dec 2012 10:41|
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