Non-uniform spatial difference in the South Asian summer monsoon during the mid-Piacenzian
The South Asian summer monsoon (SASM) during the mid-Piacenzian is analyzed through climate modelling with CAM4. The model results reveal a non-uniform spatial difference in the SASM during the mid-Piacenzian compared to the pre-industrial era, with the SASM being more intense north of ~20°N but wea...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2017-07-01
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| Series: | Atmospheric and Oceanic Science Letters |
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| Online Access: | http://dx.doi.org/10.1080/16742834.2017.1309953 |
| _version_ | 1819181109291778048 |
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| author | Ran ZHANG Qing ZHANG |
| author_facet | Ran ZHANG Qing ZHANG |
| author_sort | Ran ZHANG |
| collection | DOAJ |
| description | The South Asian summer monsoon (SASM) during the mid-Piacenzian is analyzed through climate modelling with CAM4. The model results reveal a non-uniform spatial difference in the SASM during the mid-Piacenzian compared to the pre-industrial era, with the SASM being more intense north of ~20°N but weaker south of ~20°N. In particular, summer precipitation is higher in South Asia north of ~20°N, accompanied by anomalous low-level southwesterlies from the Arabian Sea, whereas the precipitation is lower in South Asia south of ~20°N, with anomalous low-level easterlies. These differences in the SASM are related to changes in sea level pressure (SLP) due to the different boundary conditions between the two periods. Further analysis isolates the climate effects of the different boundary conditions and indicates the combined difference in atmospheric carbon dioxide concentration and SST to be the most important factor in this difference in the SASM through the changes in SLP. By comparison, the differences in vegetation and topography have limited effects. The availability of geological evidence is relative greater in northern India than in southern India, and comparison with this geological evidence shows the simulated monsoon climate to be qualitatively consistent with it, particularly for the wetter climate in northern India. |
| first_indexed | 2024-12-22T22:25:00Z |
| format | Article |
| id | doaj.art-64673423f1b1434c8844ceb9d1c8054d |
| institution | Directory Open Access Journal |
| issn | 1674-2834 2376-6123 |
| language | English |
| last_indexed | 2024-12-22T22:25:00Z |
| publishDate | 2017-07-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Atmospheric and Oceanic Science Letters |
| spelling | doaj.art-64673423f1b1434c8844ceb9d1c8054d2022-12-21T18:10:34ZengKeAi Communications Co., Ltd.Atmospheric and Oceanic Science Letters1674-28342376-61232017-07-0110426927510.1080/16742834.2017.13099531309953Non-uniform spatial difference in the South Asian summer monsoon during the mid-PiacenzianRan ZHANG0Qing ZHANG1Climate Change Research Center, Chinese Academy of SciencesInstitute of Atmospheric Physics, Chinese Academy of SciencesThe South Asian summer monsoon (SASM) during the mid-Piacenzian is analyzed through climate modelling with CAM4. The model results reveal a non-uniform spatial difference in the SASM during the mid-Piacenzian compared to the pre-industrial era, with the SASM being more intense north of ~20°N but weaker south of ~20°N. In particular, summer precipitation is higher in South Asia north of ~20°N, accompanied by anomalous low-level southwesterlies from the Arabian Sea, whereas the precipitation is lower in South Asia south of ~20°N, with anomalous low-level easterlies. These differences in the SASM are related to changes in sea level pressure (SLP) due to the different boundary conditions between the two periods. Further analysis isolates the climate effects of the different boundary conditions and indicates the combined difference in atmospheric carbon dioxide concentration and SST to be the most important factor in this difference in the SASM through the changes in SLP. By comparison, the differences in vegetation and topography have limited effects. The availability of geological evidence is relative greater in northern India than in southern India, and comparison with this geological evidence shows the simulated monsoon climate to be qualitatively consistent with it, particularly for the wetter climate in northern India.http://dx.doi.org/10.1080/16742834.2017.1309953VegetationtopographySouth Asian summer monsoonmid-Piacenzian |
| spellingShingle | Ran ZHANG Qing ZHANG Non-uniform spatial difference in the South Asian summer monsoon during the mid-Piacenzian Atmospheric and Oceanic Science Letters Vegetation topography South Asian summer monsoon mid-Piacenzian |
| title | Non-uniform spatial difference in the South Asian summer monsoon during the mid-Piacenzian |
| title_full | Non-uniform spatial difference in the South Asian summer monsoon during the mid-Piacenzian |
| title_fullStr | Non-uniform spatial difference in the South Asian summer monsoon during the mid-Piacenzian |
| title_full_unstemmed | Non-uniform spatial difference in the South Asian summer monsoon during the mid-Piacenzian |
| title_short | Non-uniform spatial difference in the South Asian summer monsoon during the mid-Piacenzian |
| title_sort | non uniform spatial difference in the south asian summer monsoon during the mid piacenzian |
| topic | Vegetation topography South Asian summer monsoon mid-Piacenzian |
| url | http://dx.doi.org/10.1080/16742834.2017.1309953 |
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