Effect of the Atlantic Multidecadal Variability on the Global Monsoon
Abstract We assess the effect of the Atlantic multidecadal variability (AMV) on the global monsoon using idealized simulations. Warm AMV phases are associated with a significant strengthening of monsoon precipitation over Northern Africa and India, and anomalously weak monsoon precipitation over Sou...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2019-02-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2018GL080903 |
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| author | Paul‐Arthur Monerie Jon Robson Buwen Dong Dan L. R. Hodson Nicholas P. Klingaman |
| author_facet | Paul‐Arthur Monerie Jon Robson Buwen Dong Dan L. R. Hodson Nicholas P. Klingaman |
| author_sort | Paul‐Arthur Monerie |
| collection | DOAJ |
| description | Abstract We assess the effect of the Atlantic multidecadal variability (AMV) on the global monsoon using idealized simulations. Warm AMV phases are associated with a significant strengthening of monsoon precipitation over Northern Africa and India, and anomalously weak monsoon precipitation over South America. Changes in monsoon precipitation are mediated by a change in atmospheric dynamics, primarily associated with a shift in the circulation related to both an enhanced interhemispheric thermal contrast and the remote impact of AMV on the Pacific Ocean, through changes in the Walker circulation. In contrast, the thermodynamic changes are less important. Further experiments show that the impact of AMV is largely due to the tropical component of the sea surface temperature anomalies. However, the extratropical Atlantic also plays a role, especially for northern Africa. Finally, we show that the effect of AMV on monsoons is not linearly related to the magnitude of warming. |
| format | Article |
| id | doaj-art-1754b4ba6f6d41dd9ce83bbfe4f24908 |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2019-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-1754b4ba6f6d41dd9ce83bbfe4f249082025-08-20T03:09:45ZengWileyGeophysical Research Letters0094-82761944-80072019-02-014631765177510.1029/2018GL080903Effect of the Atlantic Multidecadal Variability on the Global MonsoonPaul‐Arthur Monerie0Jon Robson1Buwen Dong2Dan L. R. Hodson3Nicholas P. Klingaman4National Centre for Atmospheric Science, Department of Meteorology University of Reading Reading UKNational Centre for Atmospheric Science, Department of Meteorology University of Reading Reading UKNational Centre for Atmospheric Science, Department of Meteorology University of Reading Reading UKNational Centre for Atmospheric Science, Department of Meteorology University of Reading Reading UKNational Centre for Atmospheric Science, Department of Meteorology University of Reading Reading UKAbstract We assess the effect of the Atlantic multidecadal variability (AMV) on the global monsoon using idealized simulations. Warm AMV phases are associated with a significant strengthening of monsoon precipitation over Northern Africa and India, and anomalously weak monsoon precipitation over South America. Changes in monsoon precipitation are mediated by a change in atmospheric dynamics, primarily associated with a shift in the circulation related to both an enhanced interhemispheric thermal contrast and the remote impact of AMV on the Pacific Ocean, through changes in the Walker circulation. In contrast, the thermodynamic changes are less important. Further experiments show that the impact of AMV is largely due to the tropical component of the sea surface temperature anomalies. However, the extratropical Atlantic also plays a role, especially for northern Africa. Finally, we show that the effect of AMV on monsoons is not linearly related to the magnitude of warming.https://doi.org/10.1029/2018GL080903North Altantic variabilityglobal monsoonclimate simulationexperimentsinternal variabilitytropical precipitation |
| spellingShingle | Paul‐Arthur Monerie Jon Robson Buwen Dong Dan L. R. Hodson Nicholas P. Klingaman Effect of the Atlantic Multidecadal Variability on the Global Monsoon Geophysical Research Letters North Altantic variability global monsoon climate simulation experiments internal variability tropical precipitation |
| title | Effect of the Atlantic Multidecadal Variability on the Global Monsoon |
| title_full | Effect of the Atlantic Multidecadal Variability on the Global Monsoon |
| title_fullStr | Effect of the Atlantic Multidecadal Variability on the Global Monsoon |
| title_full_unstemmed | Effect of the Atlantic Multidecadal Variability on the Global Monsoon |
| title_short | Effect of the Atlantic Multidecadal Variability on the Global Monsoon |
| title_sort | effect of the atlantic multidecadal variability on the global monsoon |
| topic | North Altantic variability global monsoon climate simulation experiments internal variability tropical precipitation |
| url | https://doi.org/10.1029/2018GL080903 |
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