Holocene Afro–Asian monsoon evolution: seasonality and large-scale dynamics
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全新世亞非季風演化: 季節性與大尺度動力
TIMELINE
TIMELINE
The goal of this research project is to gain a better understanding of the Holocene evolution of the Afro–Asian monsoon, particularly the abrupt and asynchronous changes among monsoon subsystems. A series of data-model synchronous seasonality and regionalization analyses are expected to improve understanding of the Holocene monsoon migration's forcing and response. The complete studies have been published as journal papers, including the issues
(1) Orbital forcing on modulating maritime versus continental monsoons. We studied the influence of precession and obliquity, and we assessed proxy records in the early-to-mid-Holocene and across the mid-Holocene. We also investigated the corresponding changes in the monsoons over a precessional cycle since the last deglaciation;
(2) Decadal changes in the current climate;
(3) The mid-Holocene evolution of the Afro–Asian summer monsoon circulation and paleoclimate insight into monsoon decadal changes have been provided;
(4) Greenhouse modulation of orbital forcing on the monsoons has been investigated. The results may involve near-term climate change.
RESEARCH TOPIC | PROJECT PUBLICATION
Wu, C. H., S. Y. Lee, J. C. H. Chiang, and P. C. Tsai, 2023: Role of precession on the transition seasons of the Asian monsoon. npj Clim Atmos Sci, 6, 95.
https://doi.org/10.1038/s41612-023-00426-y
Wu, C. H., S. Y. Lee, I. C. Tsai, C. J. Shiu, and Y. Y. Chen, 2023: Volcanic contribution to the 1990s North Pacific climate shift in winter. Sci Rep, 13, 5672.
https://doi.org/10.1038/s41598-023-32956-z
Wu, C. H., C. J. Shiu, Y. Y. Chen, I. C. Tsai, and S. Y. Lee, 2023: Climatological changes in East Asian winter monsoon circulation in a warmer future. Atmospheric Research, 284, 106593.
https://doi.org/10.1016/j.atmosres.2022.106593
Wu, C. H., P. C. Tsai, W. R. Huang, and S. Y. Wang, 2022: Winter-summer contrast of the 1990s decadal change in relation to Afro-Asian monsoons. Climate Dynamics, 59, 1969-1980.
https://doi.org/10.1007/s00382-022-06191-7
Wu, C. H., 2021: Seasonal adjustment of particulate matter pollution in coastal East Asia during the 2020 COVID lockdown. Environ. Res. Lett. 16, 124023.
https://doi.org/10.1088/1748-9326/ac343c
Wu, C. H., S. Y. Lee, and P. C. Tsai, 2021: Role of eccentricity in early Holocene African and Asian summer monsoons. Scientific Reports, 11, 24089.
https://doi.org/10.1038/s41598-021-03525-z
Wu, C. H., and P. C. Tsai, 2021: Impact of orbitally-driven seasonal insolation changes on Afro-Asian summer monsoons through the Holocene. Commun Earth Environ 2, 4.
https://doi.org/10.1038/s43247-020-00073-8
Wu, C. H., and P. C. Tsai, 2020: Obliquity-driven changes in East Asian seasonality. Global and Planetary Change, 189, 103161.
https://doi.org/10.1016/j.gloplacha.2020.103161
Wu, C. H., P. C. Tsai, and N. Freychet, 2020: Changing dynamical control of early Asian summer monsoon in the mid-1990s. Climate Dynamics, 54, 85-98.
INSPIRATION FOR FUTURE RESEARCH
The project's reviewer made an insightful comment about how we can use our knowledge of paleoclimate evolution to improve future projections. This concern has been incorporated into the sensitivity study, as well as the impact of obliquity on the near future.
Given the link between subtropical changes and seasonal dynamics across latitudes, understanding how the zonal distribution of subtropical dry-wet patterns, including monsoon-desert coupling, could be remapped may provide insight into asynchronous changes in the tropics and polar regions—a bottleneck challenging climate change caused by global warming. We were curious about how the coevolution of the monsoons and subtropical circulation would affect the warming-induced changes in the meridional circulation.
We have identified two promising areas for future study: (i) investigating the potential bias of monsoon decadal dynamics in climate projections, particularly about the monsoon-midlatitude interaction; and (ii) determining the climatological distribution in relation to the large-scale seasonal control of subtropical circulation.
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