How and why has extreme hourly precipitation changed in the major urban agglomerations over China?

Yali Luo, Chinese Academy of Meteorological Sciences, Beijing, China, Fei Chen, NCAR/RAL, Boulder, CO, United States, Mengwen Wu, Zhejiang Meteorological Bureau, Institute of Meteorological Sciences, Hangzhou, China and Da-Lin Zhang, University of Maryland, College Park, College Park, MD, United States