Reducing Numerical Diffusion in Dynamical Coupling Between Atmosphere and Ocean in Community Earth System Model Version 1.2.1
Abstract Climate models contain atmospheric and oceanic components that are coupled together to simulate the thermodynamic and dynamic processes during air‐sea interactions. Community Earth System Model (CESM version 1.2.1) is a state‐of‐the‐art coupled model that is widely used and participates in...
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ftdoajarticles:oai:doaj.org/article:bd0e53de3cd94e1892c0293881b610ec 2023-05-15T18:18:04+02:00 Reducing Numerical Diffusion in Dynamical Coupling Between Atmosphere and Ocean in Community Earth System Model Version 1.2.1 Jialiang Ma Shiming Xu Bin Wang 2020-09-01T00:00:00Z https://doi.org/10.1029/2020MS002052 https://doaj.org/article/bd0e53de3cd94e1892c0293881b610ec EN eng American Geophysical Union (AGU) https://doi.org/10.1029/2020MS002052 https://doaj.org/toc/1942-2466 1942-2466 doi:10.1029/2020MS002052 https://doaj.org/article/bd0e53de3cd94e1892c0293881b610ec Journal of Advances in Modeling Earth Systems, Vol 12, Iss 9, Pp n/a-n/a (2020) coupled model air‐sea interaction dynamics‐physics coupling interpolation Physical geography GB3-5030 Oceanography GC1-1581 article 2020 ftdoajarticles https://doi.org/10.1029/2020MS002052 2022-12-31T14:33:38Z Abstract Climate models contain atmospheric and oceanic components that are coupled together to simulate the thermodynamic and dynamic processes during air‐sea interactions. Community Earth System Model (CESM version 1.2.1) is a state‐of‐the‐art coupled model that is widely used and participates in Coupled Model Intercomparison Projects. Community Atmospheric Model (CAM), the atmospheric component of CESM, is based on the finite‐volume dynamic core, which utilizes staggered Arakawa‐D grids. However, the dynamics‐physics (D‐P) coupling in CAM causes the prognostic winds of the dynamic core be interpolated onto non‐staggered locations, which affects the wind structure for computing the air‐sea interaction and dynamical coupling. In this study we propose a new scheme that eliminates the extra interpolation during D‐P coupling for the atmosphere‐ocean interaction. We show that it improves the simulated climatology in key regions including eastern boundary upwelling regions and Southern Oceans. Compared with the default scheme, the new approach simulates strong surface wind near coast in eastern boundary upwelling regions. As a result, existing problems of the model, such as warm SST biases in these regions, are reduced. Meanwhile, for Southern Ocean, the prevailing westerlies are enhanced in new scheme, resulting in meridional sea ice transport. As a result, the overestimation of sea ice extent and negative bias in SST is reduced. This new scheme is generally applicable to coupled models with staggered dynamics‐physics, such as spectral‐element method based CAM. Article in Journal/Newspaper Sea ice Southern Ocean Directory of Open Access Journals: DOAJ Articles Southern Ocean Journal of Advances in Modeling Earth Systems 12 9 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
coupled model air‐sea interaction dynamics‐physics coupling interpolation Physical geography GB3-5030 Oceanography GC1-1581 |
spellingShingle |
coupled model air‐sea interaction dynamics‐physics coupling interpolation Physical geography GB3-5030 Oceanography GC1-1581 Jialiang Ma Shiming Xu Bin Wang Reducing Numerical Diffusion in Dynamical Coupling Between Atmosphere and Ocean in Community Earth System Model Version 1.2.1 |
topic_facet |
coupled model air‐sea interaction dynamics‐physics coupling interpolation Physical geography GB3-5030 Oceanography GC1-1581 |
description |
Abstract Climate models contain atmospheric and oceanic components that are coupled together to simulate the thermodynamic and dynamic processes during air‐sea interactions. Community Earth System Model (CESM version 1.2.1) is a state‐of‐the‐art coupled model that is widely used and participates in Coupled Model Intercomparison Projects. Community Atmospheric Model (CAM), the atmospheric component of CESM, is based on the finite‐volume dynamic core, which utilizes staggered Arakawa‐D grids. However, the dynamics‐physics (D‐P) coupling in CAM causes the prognostic winds of the dynamic core be interpolated onto non‐staggered locations, which affects the wind structure for computing the air‐sea interaction and dynamical coupling. In this study we propose a new scheme that eliminates the extra interpolation during D‐P coupling for the atmosphere‐ocean interaction. We show that it improves the simulated climatology in key regions including eastern boundary upwelling regions and Southern Oceans. Compared with the default scheme, the new approach simulates strong surface wind near coast in eastern boundary upwelling regions. As a result, existing problems of the model, such as warm SST biases in these regions, are reduced. Meanwhile, for Southern Ocean, the prevailing westerlies are enhanced in new scheme, resulting in meridional sea ice transport. As a result, the overestimation of sea ice extent and negative bias in SST is reduced. This new scheme is generally applicable to coupled models with staggered dynamics‐physics, such as spectral‐element method based CAM. |
format |
Article in Journal/Newspaper |
author |
Jialiang Ma Shiming Xu Bin Wang |
author_facet |
Jialiang Ma Shiming Xu Bin Wang |
author_sort |
Jialiang Ma |
title |
Reducing Numerical Diffusion in Dynamical Coupling Between Atmosphere and Ocean in Community Earth System Model Version 1.2.1 |
title_short |
Reducing Numerical Diffusion in Dynamical Coupling Between Atmosphere and Ocean in Community Earth System Model Version 1.2.1 |
title_full |
Reducing Numerical Diffusion in Dynamical Coupling Between Atmosphere and Ocean in Community Earth System Model Version 1.2.1 |
title_fullStr |
Reducing Numerical Diffusion in Dynamical Coupling Between Atmosphere and Ocean in Community Earth System Model Version 1.2.1 |
title_full_unstemmed |
Reducing Numerical Diffusion in Dynamical Coupling Between Atmosphere and Ocean in Community Earth System Model Version 1.2.1 |
title_sort |
reducing numerical diffusion in dynamical coupling between atmosphere and ocean in community earth system model version 1.2.1 |
publisher |
American Geophysical Union (AGU) |
publishDate |
2020 |
url |
https://doi.org/10.1029/2020MS002052 https://doaj.org/article/bd0e53de3cd94e1892c0293881b610ec |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Sea ice Southern Ocean |
genre_facet |
Sea ice Southern Ocean |
op_source |
Journal of Advances in Modeling Earth Systems, Vol 12, Iss 9, Pp n/a-n/a (2020) |
op_relation |
https://doi.org/10.1029/2020MS002052 https://doaj.org/toc/1942-2466 1942-2466 doi:10.1029/2020MS002052 https://doaj.org/article/bd0e53de3cd94e1892c0293881b610ec |
op_doi |
https://doi.org/10.1029/2020MS002052 |
container_title |
Journal of Advances in Modeling Earth Systems |
container_volume |
12 |
container_issue |
9 |
_version_ |
1766194312569159680 |