The feedback of midlatitude waves onto the Hadley cell in a simple general circulation model

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Date
1996
Volume
49
Issue
2
Journal
Series Titel
Book Title
Publisher
Milton Park : Taylor & Francis
Abstract

We present self-consistent comparisons of axissymmetric and 3-dimensional simulations of the tropospheric circulation under idealized physical conditions. These reveal a feedback of transient eddies onto the Hadley circulation which, first, strongly depends on equatorial heating and, second, is in case of realistic heating quite different from prescribed eddy forcing. A quantitative estimation for the eddy-induced mixing of vorticity into the poleward flow of the Hadley cell is given. The proposed relation is in accordance with observations. It is derived from the computational result that eddy momentum flux convergence is of the same order as the equatorward flux of relative vorticity generated by the Hadley circulation. Evaluation of the local budgets of sensible heat gives rise to a clear picture of how the poleward heat transports due to Hadley circulation and transient eddies interlock. This mechanism is found to be essential for an interpretation of the eddy feedback.

Description
Keywords
atmospheric circulation, GCM, Hadley cell, troposphere, zonal wind
Citation
Becker, E., Schmitz, G., & Geprägs, R. (1996). The feedback of midlatitude waves onto the Hadley cell in a simple general circulation model. 49(2). https://doi.org//10.3402/tellusa.v49i2.14464
License
CC BY 4.0 Unported