TAS acknowledges support from the Natural Sciences and Engineering Research Council of Canada through a postdoctoral fellowship. WRB began this work while supported by the John and Elaine French Environmental Fellowship and the Reginald A. Daly Postdoctoral Fellowship in the Department of Earth and Planetary Sciences at Harvard University. This work was supported in part by the facilities and staff of the Yale University Faculty of Arts and Sciences High Performance Computing Center, and by the National Science Foundation under Grant CNS 08-21132 that partially funded acquisition of the facilities. The authors are grateful to two anonymous reviewers for their helpful comments.
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Rayleigh drag is used in the linear Gill model to obtain a steady-state circulation. In the nonlinear context the circulation can be maintained by angular momentum conservation (Held and Hou 1980). Free-tropospheric Rayleigh drag is typically not prescribed in GCMs.
Simulations denoted by “hres” were run at 0.9° × 1.25° × 30 vertical levels.
When a region of strong damping is imposed east of the torque (near 300°E), the zonally symmetric component of the response is weakened suggesting that the periodicity of the domain does impact the response to the torque.
An analysis of daily mean horizontal and vertical winds revealed westward-propagating wind anomalies with horizontal structures consistent with those of equatorial Rossby waves (not shown).