《Table 1.Statistics (period, number, and mean duration) of heavy rainfall–related disturbances over

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《江淮流域夏季强降水事件的主导模态（英文）》

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Based on the above criteria，we make a year-by-year（JJA）comparison of area-averaged daily rainfall series against the corresponding different frequency bandpass-filtered rainfall anomaly series over the two regions.There are a total of 42 synoptic-timescale heavy rainfall events，with an average duration of five days（Table 1）.The 7–14-，10–20-，and 15–40-day frequency band each has one，five and three heavy rainfall events for all the 29-year analyses，with a mean duration of 11，15，and 23 days，respectively.Only two heavy rainfall events are the result of the combined action of 3–7-and 10–20-day frequency disturbances.Obviously，synoptic-timescale-disturbance–related heavy rainfall events occupy an absolute large proportion（42 among 51 events）.Because of the shorter duration，it seldom leads to severe flooding over this region.In addition，the vast majority of heavy rainfall events（42）happen in June and July；only eight synoptic-timescale and one 10–20-day-disturbance–related events occur in August.