Gao, C. J., and Coauthors, 2025: The enhancing effect of the East Asian subtropical westerly jet on summer extreme high-temperature events over central-eastern China since the late 1990s. Adv. Atmos. Sci., 42(3), 453−466, https://doi.org/10.1007/s00376-024-4027-8.
Citation: Gao, C. J., and Coauthors, 2025: The enhancing effect of the East Asian subtropical westerly jet on summer extreme high-temperature events over central-eastern China since the late 1990s. Adv. Atmos. Sci., 42(3), 453−466, https://doi.org/10.1007/s00376-024-4027-8.

The Enhancing Effect of the East Asian Subtropical Westerly Jet on Summer Extreme High-Temperature Events over Central-Eastern China Since the Late 1990s

  • The increase in frequency and intensity of Extreme High-temperature Events (EHEs) over Central-Eastern China (CEC) in recent decades has severely impacted social development and livelihoods. Using observation and reanalysis datasets, this study explores the effect of the East Asian subtropical westerly jet stream (EAJ) on the CEC EHEs for the summers spanning 1979–2020. Considering its general relative location to the right side of the upper-level jet stream exit region, CEC would theoretically suffer more EHEs with a stronger and northwardly-shifted EAJ in summer due to the likelihood of abnormal subsidence induced by the EAJ. However, such an EAJ–EHE connection has been unstable over the past four decades but has displayed an evident interdecadal change. Before the late 1990s, the interannual variation of the EAJ was manifested mainly by its meridional displacement in the northeastern part of East Asia; thus, the atmospheric responses were essentially located to the east of CEC, exerting less of an influence on the CEC EHEs. However, since the late 1990s, the EAJ variation has featured an intensity change in its center over the northwest portion of the CEC, which has resulted in a westward shift in atmospheric responses to cover the CEC region. Therefore, the EAJ could potentially affect the summer CEC EHEs during 2000–21. Our findings offer support for an in-depth understanding of the formation mechanisms of extreme weather/climate events of this nature and thus provide a scientific reference for seasonal climate predictions.
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