摘要
Using a high-resolution precipitation dataset,the present study detected that the mountainous area of central China(MACA)is a hotspot of ENSO’s impact on the summer rainfall variability.Further analysis suggests that both ENSO and atmospheric forcing make contributions to the summer rainfall variability in MACA.The dominant rainfall-related SST mode features as a seasonal transition from an El Niño-like warming in the preceding winter to a La Nina-like cooling in the following autumn,and it explains about 29%of the total variance of the rainfall during 1951–2018.It indicates that ENSO with a rapid phase transition is responsible for inducing summer rainfall anomalies in MACA.Besides,an upperlevel circumglobal wave mode in the Northern Hemisphere during summer also explains about 29%of the summer rainfall variance.Contributions of both the SST and the atmospheric modes have experienced interdecadal changes.The influence of the SST mode gradually increases and plays a dominant role in the recent decades,suggesting that ENSO with a rapid phase transition becomes more important for rainfall prediction in MACA.
Using a high-resolution precipitation dataset, the present study detected that the mountainous area of central China(MACA) is a hotspot of ENSO’s impact on the summer rainfall variability. Further analysis suggests that both ENSO and atmospheric forcing make contributions to the summer rainfall variability in MACA. The dominant rainfall-related SST mode features as a seasonal transition from an El Ni?o-like warming in the preceding winter to a La Nina-like cooling in the following autumn, and it explains about 29% of the total variance of the rainfall during 1951–2018. It indicates that ENSO with a rapid phase transition is responsible for inducing summer rainfall anomalies in MACA. Besides, an upperlevel circumglobal wave mode in the Northern Hemisphere during summer also explains about 29% of the summer rainfall variance. Contributions of both the SST and the atmospheric modes have experienced interdecadal changes. The influence of the SST mode gradually increases and plays a dominant role in the recent decades, suggesting that ENSO with a rapid phase transition becomes more important for rainfall prediction in MACA.
基金
jointly supported by the National Key R&D Program of China (2019YFA0606703)
the Strategic Priority Research Program of Chinese Academy of Sciences (XDA20060502)
the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA20060502)
the National Natural Science Foundation of China (Grant Nos. 41425086, 41661144016, 41706026, 41506003 and 41731173)
the State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences (Project No. LTO 1704)
