Preprints
https://doi.org/10.5194/egusphere-2023-340
https://doi.org/10.5194/egusphere-2023-340
07 Mar 2023
 | 07 Mar 2023

The impact of model resolution on the Southern Hemisphere in CCSM4 idealized climate simulations

Houraa Daher and Ben P. Kirtman

Abstract. Ocean model resolution plays a large role in accurately simulating the Southern Hemisphere circulation in both the ocean and atmosphere. Resolving the ocean mesoscale field is important as it has been shown to have a significant impact on the large-scale climate in eddy rich regions (i.e., western boundary currents, the Antarctic Circumpolar Current) which also are regions of large CO2 absorption. The presence of ocean mesoscale features can affect sea surface temperatures, the strength and location of the storm tracks, and many other air-sea processes. Additionally, with an improvement in resolution, the eddy kinetic energy in the ocean can be expected to change considerably. The significance model resolution has on the Southern Hemisphere is examined using Community Climate System Model, version 4 ocean eddy-parameterizing and eddy-resolving simulations. The CO2 concentrations and ozone levels are specified independently to better understand how the mesoscale field responds to extreme changes in the external forcing and the resulting climate impacts. Overall, in the eddy-parameterizing simulations, the ozone forcing is found to be more important than the changes in CO2 concentrations for the zonal mean atmospheric temperature, zonal mean zonal wind, sea surface temperature, sea surface height, eddy kinetic energy, zonal mean ocean temperature, convective precipitation, and surface temperature. In the case of the eddy-resolving simulations, however, the CO2 concentrations are found to be more dominant, especially in eddy-rich regions.

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Houraa Daher and Ben P. Kirtman

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CEC1: 'Comment on egusphere-2023-340', Juan Antonio Añel, 06 Apr 2023
    • AC1: 'Reply on CEC1', Houraa Daher, 10 Apr 2023
      • CEC2: 'Reply on AC1', Juan Antonio Añel, 13 Apr 2023
        • AC2: 'Reply on CEC2', Houraa Daher, 17 Apr 2023
  • RC1: 'Comment on egusphere-2023-340', Anonymous Referee #1, 10 May 2023
    • AC3: 'Reply on RC1', Houraa Daher, 22 May 2023
  • RC2: 'Comment on egusphere-2023-340', Anonymous Referee #2, 13 May 2023
    • AC4: 'Reply on RC2', Houraa Daher, 22 May 2023

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CEC1: 'Comment on egusphere-2023-340', Juan Antonio Añel, 06 Apr 2023
    • AC1: 'Reply on CEC1', Houraa Daher, 10 Apr 2023
      • CEC2: 'Reply on AC1', Juan Antonio Añel, 13 Apr 2023
        • AC2: 'Reply on CEC2', Houraa Daher, 17 Apr 2023
  • RC1: 'Comment on egusphere-2023-340', Anonymous Referee #1, 10 May 2023
    • AC3: 'Reply on RC1', Houraa Daher, 22 May 2023
  • RC2: 'Comment on egusphere-2023-340', Anonymous Referee #2, 13 May 2023
    • AC4: 'Reply on RC2', Houraa Daher, 22 May 2023
Houraa Daher and Ben P. Kirtman
Houraa Daher and Ben P. Kirtman

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Short summary
This study looks at the effect ocean model resolution has on the Southern Hemisphere climate using data from a global climate model. Low resolution and high resolution data are used to observe changes and the CO2 concentrations and ozone are varied to determine which is more important. In the low resolution data, the ozone is found to be more important than the CO2 concentrations. The opposite is seen for the high resolution data with the CO2 concentrations being more dominant than the ozone.