Multiscale interaction underlying 2022 concurrent extreme precipitation in Pakistan and heatwave in Yangtze River Valley

Unprecedented extreme precipitation in Pakistan (PAK) and a mega heatwave in the Yangtze River Valley (YRV) occurred concurrently from July to August 2022. Using a multiscale window transform-based canonical transfer attribution framework, the study quantitatively analyzed intra-scale and inter-scale interactions driving these concurrent extremes. In July, inter-scale dynamic processes and barotropic instability preserved the concurrent extremes. In August, synoptic-scale kinetic energy convergence was crucial. The tropical western-central Pacific heat source also played a significant role. The study highlights the interaction between multiple scales of atmospheric dynamics and the mechanisms behind warming's impact on extreme events.

Qianrong Ma, Yingxiao Sun, Rui Hu, Zhiwei Zhu, Kaiguo Xiong, Hao Wu, Pengcheng Yan, Guolin Feng