Impact of stochastic physics and model resolution on the simulation of tropical cyclones in climate GCMs
The role of model resolution in simulating geophysical vortices with the characteristics of realistic Tropical Cyclones (TCs) is well established. The push for increasing resolution continues, with General Circulation Models (GCMs) starting to use sub-10km grid spacing. In the same context it has be...
| Main Authors: | , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
American Meteorological Society
2021
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| _version_ | 1826257341609148416 |
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| author | Vidale, PL Hodges, K Vanniere, B Davini, P Roberts, M Strommen, K Weisheimer, A Plesca, E Corti, S |
| author_facet | Vidale, PL Hodges, K Vanniere, B Davini, P Roberts, M Strommen, K Weisheimer, A Plesca, E Corti, S |
| author_sort | Vidale, PL |
| collection | OXFORD |
| description | The role of model resolution in simulating geophysical vortices with the characteristics of realistic Tropical Cyclones (TCs) is well established. The push for increasing resolution continues, with General Circulation Models (GCMs) starting to use sub-10km grid spacing. In the same context it has been suggested that the use of Stochastic Physics (SP) may act as a surrogate for high resolution, providing some of the benefits at a fraction of the cost. Either technique can reduce model uncertainty, and enhance reliability, by providing a more dynamic environment for initial synoptic disturbances to be spawned and to grow into TCs. We present results from a systematic comparison of the role of model resolution and SP in the simulation of TCs, using EC-Earth simulations from project Climate-SPHINX, in large ensemble mode, spanning five different resolutions. All tropical cyclonic systems, including TCs, were tracked explicitly. As in previous studies, the number of simulated TCs increases with the use of higher resolution, but SP further enhances TC frequencies by ≈ 30%, in a strikingly similar way. The use of SP is beneficial for removing systematic climate biases, albeit not consistently so for interannual variability; conversely, the use of SP improves the simulation of the seasonal cycle of TC frequency. An investigation of the mechanisms behind this response indicates that SP generates both higher TC (and TC seed) genesis rates, and more suitable environmental conditions, enabling a more efficient transition of TC seeds into TCs. These results were confirmed by the use of equivalent simulations with the HadGEM3-GC31 GCM. |
| first_indexed | 2024-03-06T18:16:39Z |
| format | Journal article |
| id | oxford-uuid:04d8c0be-6501-4e40-ae8f-8e0058a1999c |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T18:16:39Z |
| publishDate | 2021 |
| publisher | American Meteorological Society |
| record_format | dspace |
| spelling | oxford-uuid:04d8c0be-6501-4e40-ae8f-8e0058a1999c2022-03-26T08:53:58ZImpact of stochastic physics and model resolution on the simulation of tropical cyclones in climate GCMsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:04d8c0be-6501-4e40-ae8f-8e0058a1999cEnglishSymplectic ElementsAmerican Meteorological Society2021Vidale, PLHodges, KVanniere, BDavini, PRoberts, MStrommen, KWeisheimer, APlesca, ECorti, SThe role of model resolution in simulating geophysical vortices with the characteristics of realistic Tropical Cyclones (TCs) is well established. The push for increasing resolution continues, with General Circulation Models (GCMs) starting to use sub-10km grid spacing. In the same context it has been suggested that the use of Stochastic Physics (SP) may act as a surrogate for high resolution, providing some of the benefits at a fraction of the cost. Either technique can reduce model uncertainty, and enhance reliability, by providing a more dynamic environment for initial synoptic disturbances to be spawned and to grow into TCs. We present results from a systematic comparison of the role of model resolution and SP in the simulation of TCs, using EC-Earth simulations from project Climate-SPHINX, in large ensemble mode, spanning five different resolutions. All tropical cyclonic systems, including TCs, were tracked explicitly. As in previous studies, the number of simulated TCs increases with the use of higher resolution, but SP further enhances TC frequencies by ≈ 30%, in a strikingly similar way. The use of SP is beneficial for removing systematic climate biases, albeit not consistently so for interannual variability; conversely, the use of SP improves the simulation of the seasonal cycle of TC frequency. An investigation of the mechanisms behind this response indicates that SP generates both higher TC (and TC seed) genesis rates, and more suitable environmental conditions, enabling a more efficient transition of TC seeds into TCs. These results were confirmed by the use of equivalent simulations with the HadGEM3-GC31 GCM. |
| spellingShingle | Vidale, PL Hodges, K Vanniere, B Davini, P Roberts, M Strommen, K Weisheimer, A Plesca, E Corti, S Impact of stochastic physics and model resolution on the simulation of tropical cyclones in climate GCMs |
| title | Impact of stochastic physics and model resolution on the simulation of tropical cyclones in climate GCMs |
| title_full | Impact of stochastic physics and model resolution on the simulation of tropical cyclones in climate GCMs |
| title_fullStr | Impact of stochastic physics and model resolution on the simulation of tropical cyclones in climate GCMs |
| title_full_unstemmed | Impact of stochastic physics and model resolution on the simulation of tropical cyclones in climate GCMs |
| title_short | Impact of stochastic physics and model resolution on the simulation of tropical cyclones in climate GCMs |
| title_sort | impact of stochastic physics and model resolution on the simulation of tropical cyclones in climate gcms |
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