A Model Investigation of Aerosol‐Induced Changes in the East Asian Winter Monsoon
Abstract The response of the East Asian winter monsoon (EAWM) circulation to aerosols is studied using a coupled atmosphere‐slab ocean general circulation model. In the extratropics, the aerosol‐induced cooling in the midlatitudes leads to an intensified subtropical jet stream, a deepened East Asian...
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| Format: | Article |
| Language: | English |
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Wiley
2019-08-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2019GL084228 |
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| author | Zhen Liu Yi Ming Lin Wang Massimo Bollasina Ming Luo Ngar‐Cheung Lau Steve Hung‐Lam Yim |
| author_facet | Zhen Liu Yi Ming Lin Wang Massimo Bollasina Ming Luo Ngar‐Cheung Lau Steve Hung‐Lam Yim |
| author_sort | Zhen Liu |
| collection | DOAJ |
| description | Abstract The response of the East Asian winter monsoon (EAWM) circulation to aerosols is studied using a coupled atmosphere‐slab ocean general circulation model. In the extratropics, the aerosol‐induced cooling in the midlatitudes leads to an intensified subtropical jet stream, a deepened East Asian trough, and thus an enhanced EAWM. In the tropics, the local Hadley circulation shifts southward to compensate for the interhemispheric asymmetry in aerosol radiative cooling. Anomalous subsidence at around 10°N leads to a salient anticyclone to the southwest of the Philippines. The associated southwesterlies advect abundant moisture to South China, resulting in local precipitation increases and suggesting a weaker EAWM. The EAWM response to aerosol forcing is thus driven by a competition between tropical and extratropical mechanisms, which has important implications for the future monsoon evolution, as aerosol changes may follow different regional‐dependent trajectories. |
| format | Article |
| id | doaj-art-11f47b377b0546ec9eaeeaeac7fbd384 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2019-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-11f47b377b0546ec9eaeeaeac7fbd3842025-08-20T02:24:35ZengWileyGeophysical Research Letters0094-82761944-80072019-08-014616101861019510.1029/2019GL084228A Model Investigation of Aerosol‐Induced Changes in the East Asian Winter MonsoonZhen Liu0Yi Ming1Lin Wang2Massimo Bollasina3Ming Luo4Ngar‐Cheung Lau5Steve Hung‐Lam Yim6Institute of Space and Earth Information Science The Chinese University of Hong Kong Hong Kong, ChinaGeophysical Fluid Dynamics Laboratory/NOAA Princeton NJ USACenter for Monsoon System Research, Institute of Atmospheric Physics Chinese Academy of Science Beijing ChinaSchool of Geosciences University of Edinburgh Edinburgh UKSchool of Geography and Planning, and Guangdong Key Laboratory for Urbanization and Geo‐simulation Sun Yat‐sen University Guangzhou ChinaInstitute of Environment, Energy, and Sustainability The Chinese University of Hong Kong Sha Tin Hong KongDepartment of Geography and Resource Management The Chinese University of Hong Kong Sha Tin Hong KongAbstract The response of the East Asian winter monsoon (EAWM) circulation to aerosols is studied using a coupled atmosphere‐slab ocean general circulation model. In the extratropics, the aerosol‐induced cooling in the midlatitudes leads to an intensified subtropical jet stream, a deepened East Asian trough, and thus an enhanced EAWM. In the tropics, the local Hadley circulation shifts southward to compensate for the interhemispheric asymmetry in aerosol radiative cooling. Anomalous subsidence at around 10°N leads to a salient anticyclone to the southwest of the Philippines. The associated southwesterlies advect abundant moisture to South China, resulting in local precipitation increases and suggesting a weaker EAWM. The EAWM response to aerosol forcing is thus driven by a competition between tropical and extratropical mechanisms, which has important implications for the future monsoon evolution, as aerosol changes may follow different regional‐dependent trajectories.https://doi.org/10.1029/2019GL084228aerosolEast Asian winter monsoon |
| spellingShingle | Zhen Liu Yi Ming Lin Wang Massimo Bollasina Ming Luo Ngar‐Cheung Lau Steve Hung‐Lam Yim A Model Investigation of Aerosol‐Induced Changes in the East Asian Winter Monsoon Geophysical Research Letters aerosol East Asian winter monsoon |
| title | A Model Investigation of Aerosol‐Induced Changes in the East Asian Winter Monsoon |
| title_full | A Model Investigation of Aerosol‐Induced Changes in the East Asian Winter Monsoon |
| title_fullStr | A Model Investigation of Aerosol‐Induced Changes in the East Asian Winter Monsoon |
| title_full_unstemmed | A Model Investigation of Aerosol‐Induced Changes in the East Asian Winter Monsoon |
| title_short | A Model Investigation of Aerosol‐Induced Changes in the East Asian Winter Monsoon |
| title_sort | model investigation of aerosol induced changes in the east asian winter monsoon |
| topic | aerosol East Asian winter monsoon |
| url | https://doi.org/10.1029/2019GL084228 |
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