01 Sep 2023
 | 01 Sep 2023
Status: this preprint is open for discussion.

An overview of cloud-radiation denial experiments for the Energy Exascale Earth System Model version 1

Bryce E. Harrop, Jian Lu, L. Ruby Leung, William K. M. Lau, Kyu-Myong Kim, Brian Medeiros, Brian J. Soden, Gabriel A. Vecchi, Bosong Zhang, and Balwinder Singh

Abstract. The interaction of clouds and radiation is a key process within the climate system, and assessing the impacts of that interaction provides valuable insights into both the present day climate and future projections. Many modeling experiments have been designed over the years to probe the impact of the cloud radiative effect (CRE) on the climate, including those that seek to disrupt the mean CRE effect and those that only disrupt the covariance of the CRE with the circulation. Seven such experimental designs have been added into the U.S. DOE's Energy Exascale Earth System Model version 1 (E3SMv1). These experiments include both the first and second iterations of the Clouds On-Off Klimate Intercomparison Experiment (COOKIE) experimental design, as well as the cloud-locking method. This manuscript documents the code changes necessary for implement such experiments and also provides detailed instructions for how to run them. Analyses across experiment types provide valuable insights and confirm the findings of prior studies, including the role of cloud-radiative heating toward intensifying the monsoon, intensifying rain rates, and poleward expansion of the general circulation owing to cloud feedbacks.

Bryce E. Harrop et al.

Status: open (until 01 Nov 2023)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-1555', Blaž Gasparini, 26 Sep 2023 reply

Bryce E. Harrop et al.

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Bryce E. Harrop et al.


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Short summary
Seven new experimental setups designed to interfere with cloud-radiative heating have been added to the Energy Exascale Earth System Model (E3SM). These experiments include both those that test the mean impact of the cloud-radiative heating, as well as those examining its covariance with circulations. The manuscript documents the code changes and steps needed to run these experiments. Results corroborate prior findings for how cloud-radiative heating impacts circulations and rainfall patterns.