A spectral nudging method for the ACCESS1.3 atmospheric model
A convolution-based method of spectral nudging of atmospheric fields is developed in the Australian Community Climate and Earth Systems Simulator (ACCESS) version 1.3 which uses the UK Met Office Unified Model version 7.3 as its atmospheric component. The use of convolutions allow for flexibility in...
| Main Authors: | , |
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| Format: | Journal article |
| Language: | English |
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European Geosciences Union
2015
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| _version_ | 1797060180433698816 |
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| author | Uhe, P Thatcher, M |
| author_facet | Uhe, P Thatcher, M |
| author_sort | Uhe, P |
| collection | OXFORD |
| description | A convolution-based method of spectral nudging of atmospheric fields is developed in the Australian Community Climate and Earth Systems Simulator (ACCESS) version 1.3 which uses the UK Met Office Unified Model version 7.3 as its atmospheric component. The use of convolutions allow for flexibility in application to different atmospheric grids. An approximation using one-dimensional convolutions is applied, improving the time taken by the nudging scheme by 10–30 times compared with a version using a two-dimensional convolution, without measurably degrading its performance. Care needs to be taken in the order of the convolutions and the frequency of nudging to obtain the best outcome. The spectral nudging scheme is benchmarked against a Newtonian relaxation method, nudging winds and air temperature towards ERA-Interim reanalyses. We find that the convolution approach can produce results that are competitive with Newtonian relaxation in both the effectiveness and efficiency of the scheme, while giving the added flexibility of choosing which length scales to nudge. |
| first_indexed | 2024-03-06T20:13:42Z |
| format | Journal article |
| id | oxford-uuid:2b6dcda3-cceb-4a67-be68-858ecfe828b1 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T20:13:42Z |
| publishDate | 2015 |
| publisher | European Geosciences Union |
| record_format | dspace |
| spelling | oxford-uuid:2b6dcda3-cceb-4a67-be68-858ecfe828b12022-03-26T12:30:55ZA spectral nudging method for the ACCESS1.3 atmospheric modelJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:2b6dcda3-cceb-4a67-be68-858ecfe828b1EnglishORA DepositEuropean Geosciences Union2015Uhe, PThatcher, MA convolution-based method of spectral nudging of atmospheric fields is developed in the Australian Community Climate and Earth Systems Simulator (ACCESS) version 1.3 which uses the UK Met Office Unified Model version 7.3 as its atmospheric component. The use of convolutions allow for flexibility in application to different atmospheric grids. An approximation using one-dimensional convolutions is applied, improving the time taken by the nudging scheme by 10–30 times compared with a version using a two-dimensional convolution, without measurably degrading its performance. Care needs to be taken in the order of the convolutions and the frequency of nudging to obtain the best outcome. The spectral nudging scheme is benchmarked against a Newtonian relaxation method, nudging winds and air temperature towards ERA-Interim reanalyses. We find that the convolution approach can produce results that are competitive with Newtonian relaxation in both the effectiveness and efficiency of the scheme, while giving the added flexibility of choosing which length scales to nudge. |
| spellingShingle | Uhe, P Thatcher, M A spectral nudging method for the ACCESS1.3 atmospheric model |
| title | A spectral nudging method for the ACCESS1.3 atmospheric model |
| title_full | A spectral nudging method for the ACCESS1.3 atmospheric model |
| title_fullStr | A spectral nudging method for the ACCESS1.3 atmospheric model |
| title_full_unstemmed | A spectral nudging method for the ACCESS1.3 atmospheric model |
| title_short | A spectral nudging method for the ACCESS1.3 atmospheric model |
| title_sort | spectral nudging method for the access1 3 atmospheric model |
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