Human Influence on Seasonal Extreme Precipitation Changes Over the <scp>T</scp> ibetan <scp>P</scp> lateau

ABSTRACT In the past decades, the Tibetan Plateau has experienced rapid warming, accompanied by marked differences in seasonal extreme precipitation change. However, research focusing on the impact of human activities on the seasonal extreme precipitation is still limited. In this study, we employ different observations and CMIP6 models to investigate the relevant issue based on an optimal fingerprinting method. We found that both station data and ERA5 reanalysis data show similar detection results. In one‐signal analyses, the anthropogenic signal can be detected in the increasing trends of maximum 1‐day precipitation amount (Rx1day) and maximum consecutive 5‐day precipitation amount (Rx5day) in spring and winter but not in other seasons, whereas the signal of natural forcing cannot be detected in Rx1day and Rx5day changes during these two seasons. In two‐signal analyses, human activities on extreme precipitation changes over the Tibetan Plateau are noticeable during both spring and winter, with the human influence being more pronounced in spring. This study thus provides important evidence for human influences on the seasonal change of extreme precipitation over the Tibetan Plateau.