What is it about?
High clouds can warm the atmosphere by absorbing and backscattering the surface emitted electromagnetic radiation. However, the backscattering contribution is often neglected for speeding up climate simulations. This study performs a climate simulation with the backscattering contribution included. Inclusion of the backscattering contribution causes (1) additional atmospheric warming over the tropics and surface warming over polar areas and the Tibetan Plateau, (2) increased east‐west wind speeds in the lower and upper troposphere over the tropical Pacific, and (3) poleward shift of the midlatitude westerly winds in Southern Hemisphere summer. The long‐lasting equatorward biases of the midlatitude westerly winds in climate simulations may be reduced if the backscattering contribution is taken into account.
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Why is it important?
The study highlights the importance of cloud greenhouse effect in shaping atmospheric circulations over both tropics and midlatitudes.
Read the Original
This page is a summary of: Global impact of cloud longwave scattering in an atmosphere‐only general circulation model simulation, Journal of Geophysical Research Atmospheres, January 2021, American Geophysical Union (AGU), DOI: 10.1029/2020jd033968.
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