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Characteristics and Preliminary Investigation of the Variations in the

Activity of Tibetan Plateau Vortex in Summer under
the Climate Warming

TANG Zepeng， ZHANG Feimin， WANG Chenghai
（Key Laboratory of Climate Resource Development and Disaster Prevention of Gansu Province， Research and Development Center
of Earth System Model （RDCM）， college of Atmospheric Sciences， Lanzhou University， Lanzhou 730000， Gansu， China）

Abstract： Using an objectively identified dataset of Tibetan Plateau Vortex （TPV） based on three reanalysis da‐
tasets and observations， combined with the Yearbook of TPV， this study analyzes the spatiotemporal variations
of TPV activity from 1979 to 2022 and their possible relation with climate warming over the Tibetan Plateau. Re‐
sults indicate that the genesis and moving off numbers of TPV have mutations in 1997 and 2002， respectively. In
the past 20 years， although genesis and moving off numbers of TPV have significantly decreased， the intensity
of individual TPV， presents a significant increasing trend. After removing the effects of climate warming， the
genesis number of TPV in the past 20 years has exhibited a significant negative correlation with the daily tempera‐
ture range and a significant positive correlation with atmospheric heat sources over the entire layer in the Tibetan
Plateau. The significant weakening of the averaged atmospheric heat source over the entire layer in the Tibetan
Plateau over the past two decades is the main reason for the reduction in the numbers of TPV. In contrast， the sig‐
nificant increase in the intensity of individual TPV is significantly positively correlated with the significant in‐
crease of the precursor accumulated atmospheric heat sources before TPV genesis. Results of this study suggest
that although the TPVs have decreased under the climate warming， the extremes of individual TPV and their im‐
pacts on precipitation over the Tibetan Plateau and its surrounding regions， have been strengthening.
Key words： Tibetan Plateau vortex； spatiotemporal variations； climate warming