The impact of stochastic parametrisations on the representation of the Asian summer monsoon
The impact of the stochastic schemes Stochastically Perturbed Parametrisation Tendencies (SPPT) and Stochastic Kinetic Energy Backscatter Scheme (SKEBS) on the representation of interannual variability in the Asian summer monsoon is examined in the coupled climate model CCSM4. The Webster–Yang index...
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| Format: | Journal article |
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Springer
2017
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| _version_ | 1826306830828044288 |
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| author | Strømmen, KJ Christensen, HM Berner, J Palmer, TN |
| author_facet | Strømmen, KJ Christensen, HM Berner, J Palmer, TN |
| author_sort | Strømmen, KJ |
| collection | OXFORD |
| description | The impact of the stochastic schemes Stochastically Perturbed Parametrisation Tendencies (SPPT) and Stochastic Kinetic Energy Backscatter Scheme (SKEBS) on the representation of interannual variability in the Asian summer monsoon is examined in the coupled climate model CCSM4. The Webster–Yang index, measuring anomalies of a specified wind-shear index in the monsoon region, is used as a metric for monsoon strength, and is used to analyse the output of three model integrations: one deterministic, one with SPPT, and one with SKEBS. Both schemes show improved variability, which we trace back to improvements in the El Niño-Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD). SPPT improves the representation of ENSO and through teleconnections thereby the monsoon, supporting previous work on the benefits of this scheme on the model climate. SKEBS also improves monsoon variability by way of improving the representation of the IOD, in particular by breaking an overly strong coupling to ENSO. |
| first_indexed | 2024-03-07T06:53:50Z |
| format | Journal article |
| id | oxford-uuid:fd73a745-d7e7-456f-97eb-c69d676d91e9 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T06:53:50Z |
| publishDate | 2017 |
| publisher | Springer |
| record_format | dspace |
| spelling | oxford-uuid:fd73a745-d7e7-456f-97eb-c69d676d91e92022-03-27T13:28:54ZThe impact of stochastic parametrisations on the representation of the Asian summer monsoonJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:fd73a745-d7e7-456f-97eb-c69d676d91e9Symplectic Elements at OxfordSpringer2017Strømmen, KJChristensen, HMBerner, JPalmer, TNThe impact of the stochastic schemes Stochastically Perturbed Parametrisation Tendencies (SPPT) and Stochastic Kinetic Energy Backscatter Scheme (SKEBS) on the representation of interannual variability in the Asian summer monsoon is examined in the coupled climate model CCSM4. The Webster–Yang index, measuring anomalies of a specified wind-shear index in the monsoon region, is used as a metric for monsoon strength, and is used to analyse the output of three model integrations: one deterministic, one with SPPT, and one with SKEBS. Both schemes show improved variability, which we trace back to improvements in the El Niño-Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD). SPPT improves the representation of ENSO and through teleconnections thereby the monsoon, supporting previous work on the benefits of this scheme on the model climate. SKEBS also improves monsoon variability by way of improving the representation of the IOD, in particular by breaking an overly strong coupling to ENSO. |
| spellingShingle | Strømmen, KJ Christensen, HM Berner, J Palmer, TN The impact of stochastic parametrisations on the representation of the Asian summer monsoon |
| title | The impact of stochastic parametrisations on the representation of the Asian summer monsoon |
| title_full | The impact of stochastic parametrisations on the representation of the Asian summer monsoon |
| title_fullStr | The impact of stochastic parametrisations on the representation of the Asian summer monsoon |
| title_full_unstemmed | The impact of stochastic parametrisations on the representation of the Asian summer monsoon |
| title_short | The impact of stochastic parametrisations on the representation of the Asian summer monsoon |
| title_sort | impact of stochastic parametrisations on the representation of the asian summer monsoon |
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