Objective identification and variation characteristics of regional heavy rainfall events in the middle and lower reaches of the Yangtze River from 1961 to 2018

doi:10.12006/j.issn.1673-1719.2020.090

Abstract

Abstract:

The regional heavy rainfall events (RHREs) are identified by using the Objective Identification Technique for Regional Extreme Events (OITREE) based on the daily precipitation data of 381 stations in the middle and lower reaches of the Yangtze River (MLYR) from 1961 to 2018. There are 245 RHREs in total in the MLYR. The duration of the RHREs in the MLYR is mainly 2 to 3 days, and the longest is 8 days. The cumulative intensity is mainly between (2-4) ×10 ³ mm, and the cumulative area is about (2-5) × 10 ⁵ km². The RHREs in the MLYR mainly occur in summer, especially from June to July. Southeast Hubei, southern Anhui and Northern Jiangxi are the areas where the RHREs occur most frequently in the MLYR. The RHREs in the MLYR has both long-term trends and interdecadal changes. The frequency of occurrence has increased significantly in the past 58 years (0.3 times per decade). The frequency of RHREs and the five indicators all show obvious characteristics of interdecadal variability. From the 1960s to the late 1980s, the RHREs were relatively rare. It showed an increasing trend in the 1990s and reached a peak at the end of the period, after a sharp decline at the beginning of 21st century, there was a slow increase trend.

Key words: Middle and lower reaches of the Yangtze River, The regional heavy rainfall events, Climatic characteristics, Objective identification

GAO Xiao-Yi, ZHAO Jun-Hu, ZHOU Jie, QIAN Zhong-Hua, FENG Guo-Lin. Objective identification and variation characteristics of regional heavy rainfall events in the middle and lower reaches of the Yangtze River from 1961 to 2018[J]. Climate Change Research, 2021, 17(3): 329-339.

Figures/Tables 10

Fig. 1 Distribution of stations in the middle and lower reaches of the Yangtze River

Table 1 Parameters for OITREE method to identify the regional heavy rainfall events in the middle and lower reaches of the Yangtze River

Table 2 The top 12 regional heavy rainfall events in the middle and lower reaches of the Yangtze River from 1961 to 2018

Fig. 2 Spatial distribution of extreme intensity of the regional heavy rainfall events with the comprehensive intensity of top 1-2

Fig. 3 Interannual changes in the frequency of the regional heavy rainfall events in the middle and lower reaches of the Yangtze River from 1961 to 2018

Fig. 4 Inter-annual changes of the five indicators of the regional heavy rainfall events in the middle and lower reaches of the Yangtze River from 1961 to 2018 (a) extreme intensity, (b) cumulative intensity, (c) maximum area, (d) cumulative area, (e) duration

Fig. 5 Spatial distribution of frequency of the regional heavy rainfall events in the middle and lower reaches of the Yangtze River from 1961 to 2018

Fig. 6 Monthly average precipitation (a) and the frequency of the regional heavy rainfall events (b) in the middle and lower reach of the Yangtze River from 1961 to 2018

Fig. 7 Distribution of duration (a-e), cumulative intensity (f-j) and cumulative area (k-o) of the regional heavy rainfall events of different levels in the middle and lower reaches of the Yangtze River from 1961 to 2018

Fig. 8 Site frequency distribution of mild (a), moderate (b), severe (c), extreme (d) regional heavy rainfall events in the middle and lower reaches of the Yangtze River

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