Public Meteorological Service Centre;
China Meteorological Administration;
Beijing 100081 China;
Laboratory for Climate Studies&CMA-NJU Joint Laboratory for Climate Prediction Studies;
National Climate Center;
China Meteorological Administration;
Beijing 100081 China;
Department of Atmospheric Science;
School of Environmental Studies;
China University of Geoscience;
Wuhan 430074 China;
Beijing Meteorological Bureau;
Beijing 100089 China;
summer low-frequency rainfall; intraseasonal oscillation propagation; composite analysis;