Synchronisation of the equatorial QBO by the annual cycle in tropical upwelling in a warming climate
<p>The response of the period of the quasi-biennial oscillation (QBO) to increases in tropical upwelling are considered using a one-dimensional model. We find that the imposition of the annual cycle in tropical upwelling creates substantial variability in the period of the QBO. The annual cycl...
| Main Authors: | , , , |
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| Format: | Journal article |
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John Wiley and Sons Ltd
2016
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| _version_ | 1797088241553244160 |
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| author | Rajendran, K Moroz, I Read, P Osprey, S |
| author_facet | Rajendran, K Moroz, I Read, P Osprey, S |
| author_sort | Rajendran, K |
| collection | OXFORD |
| description | <p>The response of the period of the quasi-biennial oscillation (QBO) to increases in tropical upwelling are considered using a one-dimensional model. We find that the imposition of the annual cycle in tropical upwelling creates substantial variability in the period of the QBO. The annual cycle creates synchronisation regions in the wave forcing space, within which the QBO period locks onto an integer multiple of the annual forcing period. Outside of these regions, the QBO period undergoes discrete jumps as it attempts to find a stable relationship with the oscillator forcing. The resulting set of QBO periods can be either discrete or broad-banded, depending on the intrinsic period of the QBO.</p> <p>We use the same model to study the evolution of the QBO period as the strength of tropical upwelling increases as would be expected in a warmer climate. The QBO period lengthens and migrates closer towards 36 and 48 month locking regions as upwelling increases. The QBO period does not vary continuously with increased upwelling, however, but instead transitions through a series of 2- and 3-cycles before becoming locked to the annual cycle. Finally, some observational evidence for the cyclical behaviour of the QBO periods in the real atmosphere is presented.</p> |
| first_indexed | 2024-03-07T02:47:12Z |
| format | Journal article |
| id | oxford-uuid:ac6f94da-c9dd-4c28-9247-0c4009fbd387 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T02:47:12Z |
| publishDate | 2016 |
| publisher | John Wiley and Sons Ltd |
| record_format | dspace |
| spelling | oxford-uuid:ac6f94da-c9dd-4c28-9247-0c4009fbd3872022-03-27T03:28:55ZSynchronisation of the equatorial QBO by the annual cycle in tropical upwelling in a warming climateJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:ac6f94da-c9dd-4c28-9247-0c4009fbd387Symplectic Elements at OxfordJohn Wiley and Sons Ltd2016Rajendran, KMoroz, IRead, POsprey, S<p>The response of the period of the quasi-biennial oscillation (QBO) to increases in tropical upwelling are considered using a one-dimensional model. We find that the imposition of the annual cycle in tropical upwelling creates substantial variability in the period of the QBO. The annual cycle creates synchronisation regions in the wave forcing space, within which the QBO period locks onto an integer multiple of the annual forcing period. Outside of these regions, the QBO period undergoes discrete jumps as it attempts to find a stable relationship with the oscillator forcing. The resulting set of QBO periods can be either discrete or broad-banded, depending on the intrinsic period of the QBO.</p> <p>We use the same model to study the evolution of the QBO period as the strength of tropical upwelling increases as would be expected in a warmer climate. The QBO period lengthens and migrates closer towards 36 and 48 month locking regions as upwelling increases. The QBO period does not vary continuously with increased upwelling, however, but instead transitions through a series of 2- and 3-cycles before becoming locked to the annual cycle. Finally, some observational evidence for the cyclical behaviour of the QBO periods in the real atmosphere is presented.</p> |
| spellingShingle | Rajendran, K Moroz, I Read, P Osprey, S Synchronisation of the equatorial QBO by the annual cycle in tropical upwelling in a warming climate |
| title | Synchronisation of the equatorial QBO by the annual cycle in tropical upwelling in a warming climate |
| title_full | Synchronisation of the equatorial QBO by the annual cycle in tropical upwelling in a warming climate |
| title_fullStr | Synchronisation of the equatorial QBO by the annual cycle in tropical upwelling in a warming climate |
| title_full_unstemmed | Synchronisation of the equatorial QBO by the annual cycle in tropical upwelling in a warming climate |
| title_short | Synchronisation of the equatorial QBO by the annual cycle in tropical upwelling in a warming climate |
| title_sort | synchronisation of the equatorial qbo by the annual cycle in tropical upwelling in a warming climate |
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