Scale-awareness in an eddy energy constrained mesoscale eddy parameterization
There is an increasing interest in mesoscale eddy parameterizations that are scale-aware, normally interpreted to mean that a parameterization does not require parameter recalibration as the model resolution changes. Here we examine whether Gent–McWilliams (GM) based version of GEOMETRIC, a mesoscal...
| Main Authors: | , , , , , |
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| 格式: | Journal article |
| 语言: | English |
| 出版: |
American Geophysical Union
2023
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| 主题: |
| _version_ | 1826311896369725440 |
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| author | Mak, J Maddison, JR Marshall, DP Ruan, X Wang, Y Yeow, L |
| author_facet | Mak, J Maddison, JR Marshall, DP Ruan, X Wang, Y Yeow, L |
| author_sort | Mak, J |
| collection | OXFORD |
| description | There is an increasing interest in mesoscale eddy parameterizations that are scale-aware, normally interpreted to mean that a parameterization does not require parameter recalibration as the model resolution changes. Here we examine whether Gent–McWilliams (GM) based version of GEOMETRIC, a mesoscale eddy parameterization that is constrained by a parameterized eddy energy budget, is scale-aware in its energetics. It is generally known that GM-based schemes severely damp out explicit eddies, so the parameterized component would be expected to dominate across resolutions, and we might expect a negative answer to the question of energetic scale-awareness. A consideration of why GM-based schemes damp out explicit eddies leads a suggestion for what we term a splitting procedure: a definition of a “large-scale” field is sought, and the eddy-induced velocity from the GM-scheme is computed from and acts only on the large-scale field, allowing explicit and parameterized components to co-exist. Within the context of an idealized re-entrant channel model of the Southern Ocean, evidence is provided that the GM-based version of GEOMETRIC is scale-aware in the energetics as long as we employ a splitting procedure. The splitting procedure also leads to an improved representation of mean states without detrimental effects on the explicit eddy motions. |
| first_indexed | 2024-03-07T08:18:01Z |
| format | Journal article |
| id | oxford-uuid:01d9c7c8-2ddf-4e37-ac3d-a25a074f1e45 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T08:18:01Z |
| publishDate | 2023 |
| publisher | American Geophysical Union |
| record_format | dspace |
| spelling | oxford-uuid:01d9c7c8-2ddf-4e37-ac3d-a25a074f1e452024-01-22T09:43:17ZScale-awareness in an eddy energy constrained mesoscale eddy parameterizationJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:01d9c7c8-2ddf-4e37-ac3d-a25a074f1e45eddy, parameterization, ocean modeling, scale-aware, energeticsEnglishSymplectic ElementsAmerican Geophysical Union2023Mak, JMaddison, JRMarshall, DPRuan, XWang, YYeow, LThere is an increasing interest in mesoscale eddy parameterizations that are scale-aware, normally interpreted to mean that a parameterization does not require parameter recalibration as the model resolution changes. Here we examine whether Gent–McWilliams (GM) based version of GEOMETRIC, a mesoscale eddy parameterization that is constrained by a parameterized eddy energy budget, is scale-aware in its energetics. It is generally known that GM-based schemes severely damp out explicit eddies, so the parameterized component would be expected to dominate across resolutions, and we might expect a negative answer to the question of energetic scale-awareness. A consideration of why GM-based schemes damp out explicit eddies leads a suggestion for what we term a splitting procedure: a definition of a “large-scale” field is sought, and the eddy-induced velocity from the GM-scheme is computed from and acts only on the large-scale field, allowing explicit and parameterized components to co-exist. Within the context of an idealized re-entrant channel model of the Southern Ocean, evidence is provided that the GM-based version of GEOMETRIC is scale-aware in the energetics as long as we employ a splitting procedure. The splitting procedure also leads to an improved representation of mean states without detrimental effects on the explicit eddy motions. |
| spellingShingle | eddy, parameterization, ocean modeling, scale-aware, energetics Mak, J Maddison, JR Marshall, DP Ruan, X Wang, Y Yeow, L Scale-awareness in an eddy energy constrained mesoscale eddy parameterization |
| title | Scale-awareness in an eddy energy constrained mesoscale eddy parameterization |
| title_full | Scale-awareness in an eddy energy constrained mesoscale eddy parameterization |
| title_fullStr | Scale-awareness in an eddy energy constrained mesoscale eddy parameterization |
| title_full_unstemmed | Scale-awareness in an eddy energy constrained mesoscale eddy parameterization |
| title_short | Scale-awareness in an eddy energy constrained mesoscale eddy parameterization |
| title_sort | scale awareness in an eddy energy constrained mesoscale eddy parameterization |
| topic | eddy, parameterization, ocean modeling, scale-aware, energetics |
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