E3SMv0‐HiLAT: A Modified Climate System Model Targeted for the Study of High Latitude Processes

TitleE3SMv0‐HiLAT: A Modified Climate System Model Targeted for the Study of High Latitude Processes
Publication TypeJournal Article
Year of Publication2019
AuthorsHecht, Matthew W., Veneziani Milena, Weijer Wilbert, Kravitz Ben, Burrows Susannah, Comeau Darin, Hunke Elizabeth, Jeffery Nicole, Urrego-Blanco Jorge, Wang Hailong, Wang Shanlin, Zhang jiaxu, Bailey David, Mills Catrin, Rasch Philip, and Urban Nathan
JournalJournal of Advances in Modeling Earth Systems
Date PublishedJul-30-2019
Abstract / Summary

We document the configuration, tuning, and evaluation of a modified version of the Community Earth System Model version 1 (Hurrell et al., 2013, https://doi.org/10.1175/BAMS-D-12), introduced here as E3SMv0‐HiLAT, intended for study of high‐latitude processes. E3SMv0‐HiLAT incorporates changes to the atmospheric model affecting aerosol transport to high northern latitudes and to reduce shortwave cloud bias over the Southern Ocean. An updated sea ice model includes biogeochemistry that is coupled to an extended version of the ocean model's biogechemistry. This enables cloud nucleation to depend on the changing marine emissions of aerosol precursors, which may be expected in scenarios with strongly changing sea ice extent, oceanic stratification and associated nutrient availability, and atmospheric state. An evaluation of the basic preindustrial state of E3SMv0‐HiLAT is presented in order to ensure that its climate is adequate to support future experimentation. Additional capability is not achieved without some cost, relative to the extraordinarily well‐tuned model from which it was derived. In particular, a reduction of bias in cloud forcing achieved over the Southern Hemisphere also allows for greater Southern Ocean sea ice extent, a tendency that has been partially but not fully alleviated through experimentation and tuning. The most interesting change in the behavior of the model may be its response to greenhouse gas forcing: While the climate sensitivity is found to be essentially unchanged from that of Community Earth System Model version 1, the adjusted radiative forcing has increased from within one standard deviation above that of Coupled Model Intercomparison Project Phase 5 models to nearly two standard deviations.

URLhttps://doi.org/10.1029/2018MS001524
DOI10.1029/2018MS001524
Journal: Journal of Advances in Modeling Earth Systems
Year of Publication: 2019
Date Published: Jul-30-2019

We document the configuration, tuning, and evaluation of a modified version of the Community Earth System Model version 1 (Hurrell et al., 2013, https://doi.org/10.1175/BAMS-D-12), introduced here as E3SMv0‐HiLAT, intended for study of high‐latitude processes. E3SMv0‐HiLAT incorporates changes to the atmospheric model affecting aerosol transport to high northern latitudes and to reduce shortwave cloud bias over the Southern Ocean. An updated sea ice model includes biogeochemistry that is coupled to an extended version of the ocean model's biogechemistry. This enables cloud nucleation to depend on the changing marine emissions of aerosol precursors, which may be expected in scenarios with strongly changing sea ice extent, oceanic stratification and associated nutrient availability, and atmospheric state. An evaluation of the basic preindustrial state of E3SMv0‐HiLAT is presented in order to ensure that its climate is adequate to support future experimentation. Additional capability is not achieved without some cost, relative to the extraordinarily well‐tuned model from which it was derived. In particular, a reduction of bias in cloud forcing achieved over the Southern Hemisphere also allows for greater Southern Ocean sea ice extent, a tendency that has been partially but not fully alleviated through experimentation and tuning. The most interesting change in the behavior of the model may be its response to greenhouse gas forcing: While the climate sensitivity is found to be essentially unchanged from that of Community Earth System Model version 1, the adjusted radiative forcing has increased from within one standard deviation above that of Coupled Model Intercomparison Project Phase 5 models to nearly two standard deviations.

DOI: 10.1029/2018MS001524
Citation:
Hecht, MW, M Veneziani, W Weijer, B Kravitz, S Burrows, D Comeau, E Hunke, et al.  2019.  "E3SMv0‐HiLAT: A Modified Climate System Model Targeted for the Study of High Latitude Processes."  Journal of Advances in Modeling Earth Systems.  https://doi.org/10.1029/2018MS001524.
Related Publication(s):
Golaz, J, PM Caldwell, LP Van Roekel, MR Petersen, Q Tang, JD Wolfe, G Abeshu, et al.  2019.  "The DOE E3SM Coupled Model Version 1: Overview and Evaluation at Standard Resolution."  Journal of Advances in Modeling Earth Systems.  https://doi.org/10.1029/2018ms001603.