Submitted as: development and technical paper
25 Feb 2022
Submitted as: development and technical paper | 25 Feb 2022
Status: a revised version of this preprint is currently under review for the journal GMD.

Importance of different parameterization changes for the updated dust cycle modelling in the Community Atmosphere Model (version 6.1)

Longlei Li1, Natalie Mahowald1, Jasper Kok2, Xiaohong Liu3, Mingxuan Wu4, Danny Leung2, Douglas Hamilton1, Louisa Emmons5, Yue Huang2,7,8, Jun Meng2, Neil Sexton1, and Jessica Wan6 Longlei Li et al.
  • 1Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, United States
  • 2Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States
  • 3Department of Atmospheric Sciences, Texas A&M University, College Station, TX, United States
  • 4Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, WA, United States
  • 5Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, United States
  • 6Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, USA
  • 7Earth Institute, Columbia University, New York, NY 10025, USA
  • 8NASA Goddard Institute for Space Studies, New York, NY 10025, USA

Abstract. The Community Earth System Model (CESM; version 2.1) simulates the lifecycle (emission, transport, and deposition) of mineral dust and its interactions with physio-chemical components to quantify the impacts of dust on climate and the Earth system. The accuracy of such quantifications relies on how well dust-related processes are represented in the model. Here we update the parameterizations for the dust module, including those on the dust emission scheme, the aerosol dry deposition scheme, the size distribution of transported dust, and the treatment of dust particle shape. Multiple simulations were undertaken to evaluate the model performance against diverse observations, and to understand how each update alters the modeled dust cycle and the simulated dust direct radiative effect. The model-observation comparisons suggest that substantially improved model representations of the dust cycle are achieved primarily through the new more physically-based dust emission scheme. In comparison, the other modifications except the size distribution of dust in the coarse mode induced small changes to the modeled dust cycle and model-observation comparisons. We highlight which changes introduced here are important for which regions, shedding light on further dust model developments required for more accurately estimating interactions between dust and climate.

Longlei Li et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CEC1: 'Comment on gmd-2022-31', Juan Antonio Añel, 01 Mar 2022
  • RC1: 'Comment on gmd-2022-31', Anonymous Referee #1, 31 Mar 2022
  • RC2: 'Comment on gmd-2022-31', Anonymous Referee #2, 25 Apr 2022

Longlei Li et al.

Longlei Li et al.


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Short summary
This study advances mineral dust parameterizations in the Community Atmospheric Model (CAM; version 6.1). Efforts include 1) incorporating a more physically based dust emission scheme; 2) updating the dry deposition scheme; 3) revising the gravitational settling velocity to account for dust asphericity. Substantial improvements achieved with these updates can help accurately quantify dust-climate interactions using CAM, such as the dust-radiation and dust-cloud interactions.