The Implementation of Framework for Improvement by Vertical Enhancement Into Energy Exascale Earth System Model
Abstract The low cloud bias in global climate models (GCMs) remains an unsolved problem. Coarse vertical resolution in GCMs has been suggested to be a significant cause of low cloud bias because planetary boundary layer parameterizations cannot resolve sharp temperature and moisture gradients often...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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American Geophysical Union (AGU)
2021-06-01
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| Series: | Journal of Advances in Modeling Earth Systems |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2020MS002240 |
| _version_ | 1818601140277739520 |
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| author | Hsiang‐He Lee Peter Bogenschutz Takanobu Yamaguchi |
| author_facet | Hsiang‐He Lee Peter Bogenschutz Takanobu Yamaguchi |
| author_sort | Hsiang‐He Lee |
| collection | DOAJ |
| description | Abstract The low cloud bias in global climate models (GCMs) remains an unsolved problem. Coarse vertical resolution in GCMs has been suggested to be a significant cause of low cloud bias because planetary boundary layer parameterizations cannot resolve sharp temperature and moisture gradients often found at the top of subtropical stratocumulus layers. This work aims to ameliorate the low cloud problem by implementing a new computational method, the Framework for Improvement by Vertical Enhancement (FIVE), into the Energy Exascale Earth System Model (E3SM). Three physics schemes representing microphysics, radiation, and turbulence as well as vertical advection are interfaced to vertically enhanced physics (VEP), which allows for these processes to be computed on a higher vertical resolution grid compared to the rest of the E3SM model. We demonstrate the better representation of subtropical boundary layer clouds with FIVE while limiting additional computational cost from the increased number of levels. When the vertical resolution approaches the large eddy simulation‐like vertical resolution in VEP, the climatological low cloud amount shows a significant increase of more than 30% in the southeastern Pacific Ocean. Using FIVE to improve the representation of low‐level clouds does not come with any negative side effects associated with the simulation of mid‐ and high‐level cloud and precipitation, that can occur when running the full model at higher vertical resolution. |
| first_indexed | 2024-12-16T12:46:39Z |
| format | Article |
| id | doaj.art-80a55d91c2e7485d8fa9a69f673802e7 |
| institution | Directory Open Access Journal |
| issn | 1942-2466 |
| language | English |
| last_indexed | 2024-12-16T12:46:39Z |
| publishDate | 2021-06-01 |
| publisher | American Geophysical Union (AGU) |
| record_format | Article |
| series | Journal of Advances in Modeling Earth Systems |
| spelling | doaj.art-80a55d91c2e7485d8fa9a69f673802e72022-12-21T22:31:16ZengAmerican Geophysical Union (AGU)Journal of Advances in Modeling Earth Systems1942-24662021-06-01136n/an/a10.1029/2020MS002240The Implementation of Framework for Improvement by Vertical Enhancement Into Energy Exascale Earth System ModelHsiang‐He Lee0Peter Bogenschutz1Takanobu Yamaguchi2Atmospheric, Earth, and Energy Division Lawrence Livermore National Laboratory Livermore CA USAAtmospheric, Earth, and Energy Division Lawrence Livermore National Laboratory Livermore CA USACooperative Institute for Research in Environmental Sciences University of Colorado Boulder CO USAAbstract The low cloud bias in global climate models (GCMs) remains an unsolved problem. Coarse vertical resolution in GCMs has been suggested to be a significant cause of low cloud bias because planetary boundary layer parameterizations cannot resolve sharp temperature and moisture gradients often found at the top of subtropical stratocumulus layers. This work aims to ameliorate the low cloud problem by implementing a new computational method, the Framework for Improvement by Vertical Enhancement (FIVE), into the Energy Exascale Earth System Model (E3SM). Three physics schemes representing microphysics, radiation, and turbulence as well as vertical advection are interfaced to vertically enhanced physics (VEP), which allows for these processes to be computed on a higher vertical resolution grid compared to the rest of the E3SM model. We demonstrate the better representation of subtropical boundary layer clouds with FIVE while limiting additional computational cost from the increased number of levels. When the vertical resolution approaches the large eddy simulation‐like vertical resolution in VEP, the climatological low cloud amount shows a significant increase of more than 30% in the southeastern Pacific Ocean. Using FIVE to improve the representation of low‐level clouds does not come with any negative side effects associated with the simulation of mid‐ and high‐level cloud and precipitation, that can occur when running the full model at higher vertical resolution.https://doi.org/10.1029/2020MS002240E3SMFIVEstratocumulus cloudvertical resolutionlow‐level cloudmarine boundary layer |
| spellingShingle | Hsiang‐He Lee Peter Bogenschutz Takanobu Yamaguchi The Implementation of Framework for Improvement by Vertical Enhancement Into Energy Exascale Earth System Model Journal of Advances in Modeling Earth Systems E3SM FIVE stratocumulus cloud vertical resolution low‐level cloud marine boundary layer |
| title | The Implementation of Framework for Improvement by Vertical Enhancement Into Energy Exascale Earth System Model |
| title_full | The Implementation of Framework for Improvement by Vertical Enhancement Into Energy Exascale Earth System Model |
| title_fullStr | The Implementation of Framework for Improvement by Vertical Enhancement Into Energy Exascale Earth System Model |
| title_full_unstemmed | The Implementation of Framework for Improvement by Vertical Enhancement Into Energy Exascale Earth System Model |
| title_short | The Implementation of Framework for Improvement by Vertical Enhancement Into Energy Exascale Earth System Model |
| title_sort | implementation of framework for improvement by vertical enhancement into energy exascale earth system model |
| topic | E3SM FIVE stratocumulus cloud vertical resolution low‐level cloud marine boundary layer |
| url | https://doi.org/10.1029/2020MS002240 |
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