Distinctive changes of Asian–African summer monsoon in interglacial epochs and global warming scenario.
In: Climate Dynamics, Jg. 62 (2024-03-01), Heft 3, S. 2129-2145
Online
academicJournal
Zugriff:
Precipitation was claimed to increase over Asian–African summer monsoon (AAM) regions during past interglacial epochs and also under future global warming scenario. Using CMIP6 model experiments, this study compares the simulated changes of AAM in Last Interglacial (LIG) and Mid-Holocene (MH) to that global warming scenario. Moisture budget analysis shows that the increased monsoon rainfall during interglacial epochs primarily results from the dynamic process associated with strengthened monsoon circulation but is caused by thermodynamic process under global warming scenario associated with increased mean moisture. To disentangle the mechanisms for the distinct changes in vertical and horizontal monsoon circulation, we further decompose the response of AAM to global warming into the direct effect from CO2 radiative forcing and the indirect effect due to increased sea surface temperature (SST), based on idealized experiments. The results show that the effect of direct CO2 radiative forcing on the AAM is similar with that in interglacial epochs driven by enhanced land–ocean equivalent potential temperature contrast, both of which are characterized by strengthened vertical and horizontal monsoon circulation despite regional difference. However, the above effect is overwhelmed by the substantially increased SST under global warming, which is absent in interglacial epochs. The substantial SST warming acts to weaken the monsoon circulation by decreasing the land–ocean equivalent potential temperature contrast and enhancing atmospheric static stability. Therefore, the lack of global SST warming in interglacial epoch is the primary cause for the distinct change of AAM circulation from global warming scenario. [ABSTRACT FROM AUTHOR]
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Distinctive changes of Asian–African summer monsoon in interglacial epochs and global warming scenario.
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Autor/in / Beteiligte Person: | Wang, Yuhao ; He, Chao ; Li, Tim ; Zhang, Chengming ; Gu, Xiaoli |
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Zeitschrift: | Climate Dynamics, Jg. 62 (2024-03-01), Heft 3, S. 2129-2145 |
Veröffentlichung: | 2024 |
Medientyp: | academicJournal |
ISSN: | 0930-7575 (print) |
DOI: | 10.1007/s00382-023-07013-0 |
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