首页|The key role of abnormal Vortex Street-like system in the Tibetan plateau’s wake in modulating extreme June-July rainfall events over Eastern China (2020 and 2024)
The key role of abnormal Vortex Street-like system in the Tibetan plateau’s wake in modulating extreme June-July rainfall events over Eastern China (2020 and 2024)
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NETL
NSTL
Springer Nature
Abstract Eastern China has frequently experienced extreme June-July rainfall events, such as those in June–July 2020 and June–July 2024, which led to severe flooding, resulting in significant economic losses and losses of life. Previous studies have explored the event’s causes. Our research indicates that these rainfall events are significantly influenced by a Vortex Street-Like system in the Tibetan Plateau’s wake (TPVSL, a phenomenon in the textbook). Using daily reanalysis and precipitation observation data, we examined the anomalous circulation associated with extreme rainfall events from the perspective of the TPVSL. Our findings reveal that the TPVSL provided a background field for ~ 80% of the rainfall during these events. In both events, the TPVSL intensity exhibited abnormal enhancement, which was related to the abnormally strong upstream westerly. However, notable differences were observed between the two events, the propagating line of the TPVSL exhibited slower northward movement and an almost east-west orientation in June-July 2020. In contrast, the north-south latitudinal change in the propagating line of the TPVSL was near normal in June-July 2024, with the line oriented southwest-northeast. These differences were related to abnormal activities in the downstream westerly belt and Western Pacific Subtropical High. Furthermore, during both events, the vortex propagation speed and shedding period remained close to normal levels. Our study provides new insight into East Asian summer climate anomalies by examining vortex street dynamics and highlights the importance of understanding TPVSL to mitigate flood disasters.
Southwest China vortexVortex street-like systemTibetan PlateauJune-July rainfallEastern China
Qi Liu、Congbin Fu、Zhongfeng Xu
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Nanjing University||Nanjing University||Nanjing University
NETL
NSTL
Springer Nature
