The Influence of Arctic Oscillation on South China Precipitation in Winter Is Modulated by the Atlantic Multidecadal Oscillation
Abstract As the dominant mode of low‐frequency atmospheric variability in extratropical Northern Hemisphere, the Arctic Oscillation (AO) exerts strong impacts on East Asian climate, with the positive AO leading to increased South China winter precipitation (SCWP). Here, we find that such AO–SCWP rel...
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| Format: | Article |
| Language: | English |
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Wiley
2024-12-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL112090 |
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| author | Jinhong Liu Jiaqing Xue Yuan Gao Hualong Zhu |
| author_facet | Jinhong Liu Jiaqing Xue Yuan Gao Hualong Zhu |
| author_sort | Jinhong Liu |
| collection | DOAJ |
| description | Abstract As the dominant mode of low‐frequency atmospheric variability in extratropical Northern Hemisphere, the Arctic Oscillation (AO) exerts strong impacts on East Asian climate, with the positive AO leading to increased South China winter precipitation (SCWP). Here, we find that such AO–SCWP relationship is nonstationary and controlled by the remote Atlantic Multidecadal Oscillation (AMO). Especially, the relationship between positive AO and SCWP is significantly weakened during the warm phase of AMO. Observational analyses and idealized Atlantic pacemaker simulations indicate that warm AMO forcing is accompanied by a teleconnection wave train extending eastward from the North Atlantic to West Pacific and the western North Pacific sea surface temperature warming, which together induce northerly wind anomalies over South China by enhancing the land–ocean pressure gradient. Such climate background state changes associated with the warm AMO prohibit the positive AO induced water vapor transport to South China, thereby weakening the AO–SCWP relationship. |
| format | Article |
| id | doaj-art-95b5ae475daf481fbb5adafa46e7d8a4 |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-95b5ae475daf481fbb5adafa46e7d8a42025-08-20T03:25:55ZengWileyGeophysical Research Letters0094-82761944-80072024-12-015123n/an/a10.1029/2024GL112090The Influence of Arctic Oscillation on South China Precipitation in Winter Is Modulated by the Atlantic Multidecadal OscillationJinhong Liu0Jiaqing Xue1Yuan Gao2Hualong Zhu3Key Laboratory of Meteorological Disaster of Ministry of Education/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Institute for Climate and Application Research Nanjing University of Information Science and Technology Nanjing People's Republic of ChinaKey Laboratory of Meteorological Disaster of Ministry of Education/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Institute for Climate and Application Research Nanjing University of Information Science and Technology Nanjing People's Republic of ChinaKey Laboratory of Meteorological Disaster of Ministry of Education/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Institute for Climate and Application Research Nanjing University of Information Science and Technology Nanjing People's Republic of ChinaKey Laboratory of Meteorological Disaster of Ministry of Education/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Institute for Climate and Application Research Nanjing University of Information Science and Technology Nanjing People's Republic of ChinaAbstract As the dominant mode of low‐frequency atmospheric variability in extratropical Northern Hemisphere, the Arctic Oscillation (AO) exerts strong impacts on East Asian climate, with the positive AO leading to increased South China winter precipitation (SCWP). Here, we find that such AO–SCWP relationship is nonstationary and controlled by the remote Atlantic Multidecadal Oscillation (AMO). Especially, the relationship between positive AO and SCWP is significantly weakened during the warm phase of AMO. Observational analyses and idealized Atlantic pacemaker simulations indicate that warm AMO forcing is accompanied by a teleconnection wave train extending eastward from the North Atlantic to West Pacific and the western North Pacific sea surface temperature warming, which together induce northerly wind anomalies over South China by enhancing the land–ocean pressure gradient. Such climate background state changes associated with the warm AMO prohibit the positive AO induced water vapor transport to South China, thereby weakening the AO–SCWP relationship.https://doi.org/10.1029/2024GL112090South China winter precipitationArctic oscillationAtlantic multidecadal oscillation |
| spellingShingle | Jinhong Liu Jiaqing Xue Yuan Gao Hualong Zhu The Influence of Arctic Oscillation on South China Precipitation in Winter Is Modulated by the Atlantic Multidecadal Oscillation Geophysical Research Letters South China winter precipitation Arctic oscillation Atlantic multidecadal oscillation |
| title | The Influence of Arctic Oscillation on South China Precipitation in Winter Is Modulated by the Atlantic Multidecadal Oscillation |
| title_full | The Influence of Arctic Oscillation on South China Precipitation in Winter Is Modulated by the Atlantic Multidecadal Oscillation |
| title_fullStr | The Influence of Arctic Oscillation on South China Precipitation in Winter Is Modulated by the Atlantic Multidecadal Oscillation |
| title_full_unstemmed | The Influence of Arctic Oscillation on South China Precipitation in Winter Is Modulated by the Atlantic Multidecadal Oscillation |
| title_short | The Influence of Arctic Oscillation on South China Precipitation in Winter Is Modulated by the Atlantic Multidecadal Oscillation |
| title_sort | influence of arctic oscillation on south china precipitation in winter is modulated by the atlantic multidecadal oscillation |
| topic | South China winter precipitation Arctic oscillation Atlantic multidecadal oscillation |
| url | https://doi.org/10.1029/2024GL112090 |
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