Abstract
The impacts of global warming on Meiyu–Baiu extreme rainfall and the associated mid-latitude synoptic-scale weather systems over the Eastern China (EC) and the Baiu rainband (Bu) regions in East Asia have been examined, based on simulations from the 20-km Meteorological Research Institute atmospheric general circulation model (MRI-AGCM3.2S). This model was demonstrated to give realistic Asian extreme rainfall, when compared with data from the Tropical Rainfall Measuring Mission (TRMM). Here we used a novel wave-selection algorithm based on the 300 hPa wind, in order to identify upper-level propagating wave signals in conjunction with the occurrence of extreme precipitation in either EC or Bu. The same algorithm was applied for both the present (1979–2003) and future (2075–2099) climate simulations from the AGCM, so as to infer the impacts of global warming on the behavior of these systems. Results show robust decrease of intensity of systems influencing both Bu and EC in the future warmer climate. Their corresponding low-to-mid level circulation, as revealed by vertical velocity, temperature advection and sea-level pressure composites, was also found to be weakened. This is likely related to changes in the background circulation in future over the East Asian mid-latitude zone, such as the widespread increment of the seasonal mean static stability at 500 hPa. However, the wave-associated precipitation over these regions was enhanced in the future climate simulations. This can be attributed to more strong intensity rainfall, which increases as the background temperature in these regions warms, largely following the Clausius–Clapeyron relation. Therefore, changes of wave-related extreme precipitation in EC and Bu are mainly controlled by the thermodynamic effect; the latter appears to be much stronger than the potential impacts due to the slight weakening of these weather systems.
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Notes
We also conducted analyses based on 2.5-to-6-day bandpass filtered anomalies. Bandpass filtering in general led to weaker signals; otherwise the results are qualitatively similar to those to be presented in subsequent sections.
Decad is defined as ten-day period.
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Acknowledgements
The authors would like to thank Dr. Akio Kitoh for generously sharing the MRI-AGCM outputs from the KAKUSHIN Program, and Profs. Edmund Chang and Joong-Bae Ahn for discussions. NCL at the Chinese University of Hong Kong is partially supported by the AXA Research Fund.
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So, K.W., Tam, CY. & Lau, NC. Impacts of global warming on Meiyu–Baiu extreme rainfall and associated mid-latitude synoptic-scale systems as inferred from 20km AGCM simulations. Clim Dyn 59, 1849–1861 (2022). https://doi.org/10.1007/s00382-021-06072-5
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DOI: https://doi.org/10.1007/s00382-021-06072-5