Based on the short-duration heavy precipitation data of 109 stations in Shanxi Province from 1981 to 2018, the extreme value, frequency, day, month and interdecadal trend changes of heavy precipitation in different diachronic periods of 12 hours were analyzed by using trend coefficient, climatic tendency rate, normalization and mesoscale weather analysis methods.The results show that： (1) The spatial distribution of the extreme value is higher over the mountain area than the basin and greater over the south than the north of Shanxi.The shorter duration of the extreme value, the stronger local distribution of the extreme value.(2) Within 12 hours, the occurrence frequency of heavy precipitation in different diachronic periods has the spatial distribution characteristics of being high in the south and low in the north, higher in the mountain area than in the basin area, higher in the eastern mountain area than in the western mountain area, and obviously concentrated in the southeast.(3) Severe precipitation with different diachronic periods occurs in July-August every year, and the frequency of short-duration heavy precipitation with 1 h ≥0 mm is the highest.(4) The intra-day distributions of heavy precipitation with 1 hour rainfall (≥20 mm), 3 hours rainfall (≥30 mm) and 12 hours rainfall (≥50 mm) are single peak curves, while the intra-day distribution of heavy precipitation with 6 hours rainfall (≥50 mm) is double peak curve.(5) The growth rates of the annual occurrence times variation of 1 hour, 3 hours, and 6 hours short-duration heavy precipitation are the highest in southeastern Shanxi Province, which is the largest in the eastern and western mountain areas of Shanxi Province of 12 hour short duration heavy precipitation.(6) The main influence systems of 6 hours and 12 hours short duration heavy precipitation are obviously different from the systems of 1 hour and 3 hours short duration heavy precipitation.61% of 6 hours and 12 hours short duration heavy precipitation cases are caused by the combination of systematic precipitation and multiple mesoscale heavy precipitation.
Aimei MIAO
,
Hongxia WANG
,
Jie WU
. Statistical Characteristics and Trend Change of Different Duration Short-Duration Heavy Rainfall in Shanxi Province[J]. Plateau Meteorology, 2020
, 39(4)
: 796
-807
.
DOI: 10.7522/j.issn.1000-0534.2019.00069
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