Earth Sciences

Feedbacks and eddy diffusivity in an energy balance model of tropical rainfall shifts

H. G. Peterson and W. R. Boos

This study explores how radiative feedbacks and eddy diffusivity play a crucial role in the shifting of the intertropical convergence zone (ITCZ) due to remote atmospheric energy sources. Conducted by Henry G. Peterson and William R. Boos, the research reveals that the Planck feedback has a stronger dampening effect on ITCZ shifts for extratropical forcings compared to tropical ones, providing key insights into climate dynamics.

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Abstract

This study uses a one-dimensional moist energy balance model (MEBM) to investigate how radiative feedbacks and eddy diffusivity influence the intertropical convergence zone (ITCZ) shifts caused by remote atmospheric energy sources. The Planck feedback damps ITCZ shifts more for extratropical forcings than tropical ones due to lower moisture in cold regions. The water vapor feedback is primarily driven by changes in the cross-equatorial asymmetry of subtropical dry zone relative humidity. ITCZ response is highly sensitive to diffusivity's meridional structure; increasing tropical diffusivity enhances the shift even with a fixed global mean.

Publisher

npj Climate and Atmospheric Science

Published On

Mar 24, 2020

Authors

Henry G. Peterson, William R. Boos

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