Convection‐Permitting Simulations With the E3SM Global Atmosphere Model
Abstract This paper describes the first implementation of the Δx = 3.25 km version of the Energy Exascale Earth System Model (E3SM) global atmosphere model and its behavior in a 40‐day prescribed‐sea‐surface‐temperature simulation (January 20 through February 28, 2020). This simulation was performed...
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American Geophysical Union (AGU)
2021
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oai:doaj.org-article:d924e18522e14e8a9fa76e1f9bc4daa82021-11-30T08:40:32ZConvection‐Permitting Simulations With the E3SM Global Atmosphere Model1942-246610.1029/2021MS002544https://doaj.org/article/d924e18522e14e8a9fa76e1f9bc4daa82021-11-01T00:00:00Zhttps://doi.org/10.1029/2021MS002544https://doaj.org/toc/1942-2466Abstract This paper describes the first implementation of the Δx = 3.25 km version of the Energy Exascale Earth System Model (E3SM) global atmosphere model and its behavior in a 40‐day prescribed‐sea‐surface‐temperature simulation (January 20 through February 28, 2020). This simulation was performed as part of the DYnamics of the Atmospheric general circulation Modeled On Non‐hydrostatic Domains (DYAMOND) Phase 2 model intercomparison. Effective resolution is found to be ∼6× the horizontal dynamics grid resolution despite using a coarser grid for physical parameterizations. Despite this new model being in an immature and untuned state, moving to 3.25 km grid spacing solves several long‐standing problems with the E3SM model. In particular, Amazon precipitation is much more realistic, the frequency of light and heavy precipitation is improved, agreement between the simulated and observed diurnal cycle of tropical precipitation is excellent, and the vertical structure of tropical convection and coastal stratocumulus look good. In addition, the new model is able to capture the frequency and structure of important weather events (e.g., tropical cyclones, extratropical cyclones including atmospheric rivers, and cold air outbreaks). Interestingly, this model does not get rid of the erroneous southern branch of the intertropical convergence zone nor the tendency for strongest convection to occur over the Maritime Continent rather than the West Pacific, both of which are classic climate model biases. Several other problems with the simulation are identified, underscoring the fact that this model is a work in progress.P. M. CaldwellC. R. TeraiB. HillmanN. D. KeenP. BogenschutzW. LinH. BeydounM. TaylorL. BertagnaA. M. BradleyT. C. ClevengerA. S. DonahueC. EldredJ. FoucarJ.‐C. GolazO. GubaR. JacobJ. JohnsonJ. KrishnaW. LiuK. PresselA. G. SalingerB. SinghA. SteyerP. UllrichD. WuX. YuanJ. ShpundH.‐Y. MaC. S. ZenderAmerican Geophysical Union (AGU)articlecloud resolving modelstorm resolving modelgeneral circulation modelconvection permitting modelE3SMPhysical geographyGB3-5030OceanographyGC1-1581ENJournal of Advances in Modeling Earth Systems, Vol 13, Iss 11, Pp n/a-n/a (2021) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
cloud resolving model storm resolving model general circulation model convection permitting model E3SM Physical geography GB3-5030 Oceanography GC1-1581 |
| spellingShingle |
cloud resolving model storm resolving model general circulation model convection permitting model E3SM Physical geography GB3-5030 Oceanography GC1-1581 P. M. Caldwell C. R. Terai B. Hillman N. D. Keen P. Bogenschutz W. Lin H. Beydoun M. Taylor L. Bertagna A. M. Bradley T. C. Clevenger A. S. Donahue C. Eldred J. Foucar J.‐C. Golaz O. Guba R. Jacob J. Johnson J. Krishna W. Liu K. Pressel A. G. Salinger B. Singh A. Steyer P. Ullrich D. Wu X. Yuan J. Shpund H.‐Y. Ma C. S. Zender Convection‐Permitting Simulations With the E3SM Global Atmosphere Model |
| description |
Abstract This paper describes the first implementation of the Δx = 3.25 km version of the Energy Exascale Earth System Model (E3SM) global atmosphere model and its behavior in a 40‐day prescribed‐sea‐surface‐temperature simulation (January 20 through February 28, 2020). This simulation was performed as part of the DYnamics of the Atmospheric general circulation Modeled On Non‐hydrostatic Domains (DYAMOND) Phase 2 model intercomparison. Effective resolution is found to be ∼6× the horizontal dynamics grid resolution despite using a coarser grid for physical parameterizations. Despite this new model being in an immature and untuned state, moving to 3.25 km grid spacing solves several long‐standing problems with the E3SM model. In particular, Amazon precipitation is much more realistic, the frequency of light and heavy precipitation is improved, agreement between the simulated and observed diurnal cycle of tropical precipitation is excellent, and the vertical structure of tropical convection and coastal stratocumulus look good. In addition, the new model is able to capture the frequency and structure of important weather events (e.g., tropical cyclones, extratropical cyclones including atmospheric rivers, and cold air outbreaks). Interestingly, this model does not get rid of the erroneous southern branch of the intertropical convergence zone nor the tendency for strongest convection to occur over the Maritime Continent rather than the West Pacific, both of which are classic climate model biases. Several other problems with the simulation are identified, underscoring the fact that this model is a work in progress. |
| format |
article |
| author |
P. M. Caldwell C. R. Terai B. Hillman N. D. Keen P. Bogenschutz W. Lin H. Beydoun M. Taylor L. Bertagna A. M. Bradley T. C. Clevenger A. S. Donahue C. Eldred J. Foucar J.‐C. Golaz O. Guba R. Jacob J. Johnson J. Krishna W. Liu K. Pressel A. G. Salinger B. Singh A. Steyer P. Ullrich D. Wu X. Yuan J. Shpund H.‐Y. Ma C. S. Zender |
| author_facet |
P. M. Caldwell C. R. Terai B. Hillman N. D. Keen P. Bogenschutz W. Lin H. Beydoun M. Taylor L. Bertagna A. M. Bradley T. C. Clevenger A. S. Donahue C. Eldred J. Foucar J.‐C. Golaz O. Guba R. Jacob J. Johnson J. Krishna W. Liu K. Pressel A. G. Salinger B. Singh A. Steyer P. Ullrich D. Wu X. Yuan J. Shpund H.‐Y. Ma C. S. Zender |
| author_sort |
P. M. Caldwell |
| title |
Convection‐Permitting Simulations With the E3SM Global Atmosphere Model |
| title_short |
Convection‐Permitting Simulations With the E3SM Global Atmosphere Model |
| title_full |
Convection‐Permitting Simulations With the E3SM Global Atmosphere Model |
| title_fullStr |
Convection‐Permitting Simulations With the E3SM Global Atmosphere Model |
| title_full_unstemmed |
Convection‐Permitting Simulations With the E3SM Global Atmosphere Model |
| title_sort |
convection‐permitting simulations with the e3sm global atmosphere model |
| publisher |
American Geophysical Union (AGU) |
| publishDate |
2021 |
| url |
https://doaj.org/article/d924e18522e14e8a9fa76e1f9bc4daa8 |
| work_keys_str_mv |
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| _version_ |
1718406714718420992 |