Abstract
ABSTRACTThe Yangtze–Huai River Basin (YHRB) always suffers from anomalously heavy rainfall during the warm season, and has been well explored as a whole area during the past several decades. In thi...
Highlights
The Yangtze–Huai River Basin (YHRB), covering roughly the area (27°–35°N, 114°–121°E), is one of the most centralized regions over East China for summer (June– July–August, JJA) rainfall
We use the following criteria to select the typical heavy rainfall events in each frequency band: (1) the maximum daily rainfall intensity in the peak wet phase (i.e., P5) should be larger than 18 (22) mm d−1 for the northern YHRB (nYHRB) region, which corresponds to the upper 5% of rainfall intensity during JJA 1979–2007; (2) the daily rainfall intensity in at least one dry phase should be smaller than 5 mm d−1; and (3) the amplitudes of the bandpass-filtered rainfall anomaly in the peak wet phase and in at least one peak dry phase should exceed one standard deviation (6.44 mm d−1 for the nYHRB and 7.10 mm d−1 for the southern YHRB (sYHRB))
Based on the spatial distribution of 29-year-averaged summer daily rainfall rates and the standard deviation of daily rainfall in East China, the YHRB is separated into two core regions, i.e., the nYHRB and sYHRB
Summary
The Yangtze–Huai River Basin (YHRB), covering roughly the area (27°–35°N, 114°–121°E), is one of the most centralized regions over East China for summer (June– July–August, JJA) rainfall. The above flooding events match well with the wet phases of ISVs. For example, the heavy rainfall events in the summer of 1991, 1998, and 2003 are consistent with the propagation and activity of ISVs with periods of 30–60 days, 15–35 days, and 10–20 days (Zhu et al 2003; Chen et al 2005; Mao. Each rainfall event over the YHRB is always related to frequently appearing midlatitude moving synoptic systems (Chang et al 1998; Qian, Tao, and Lau 2004; Jiao et al 2004). A summary and concluding remarks are given in the final section
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