Microphysical characteristics of the 2020 record-breaking Meiyu rainfall in Anhui, China

IF 4.5 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research Pub Date : 2024-12-31 DOI:10.1016/j.atmosres.2024.107900

Qiqi Yang, Shuliang Zhang, Yiheng Chen, Yuhan Jin, Hongyuan Fang

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引用次数: 0

Abstract

The 2020 Meiyu season in Anhui, China, brought unprecedented rainfall, driven by a unique interplay of high precipitation frequency and elevated convective rainfall. This study examines the distinctive microphysical characteristics of raindrop size distribution (DSD) during this record-breaking season, using minute-level data from six disdrometer stations. Brief but intense rain events contributed up to 49.4 % of the total seasonal rainfall in only 6–7 % of the duration, with the mean drop diameter increasing from 1.2 mm to 2.1 mm and the mean normalized intercept parameter rising from 2.7 to 4.1 as rainfall rate intensified. Compared to prior Meiyu studies, our findings reveal distinct DSD patterns with larger raindrops and higher concentrations, reflecting a more convective-dominated structure unique to the 2020 season. Novel μ–Λ and Z − R relationships tailored for this event revealed larger raindrop sizes and concentrations compared to past studies. Enhanced dual-polarization radar rainfall prediction models were developed, with relationships between Zdr, Zh, Kdp, and rainfall rate (R) showing exceptional accuracy, as evidenced by correlation coefficients nearing 1.0 and low RMSE and NMAE values. Additionally, new KE–R relationships accurately estimated rainfall kinetic energy (KE), with Power Law models best representing KEtime–R and Logarithmic fits for KEmm–R. These findings demonstrate the importance of DSD-specific insights for understanding microphysical processes and improving QPE accuracy, with implications for flood and soil erosion management in eastern China.

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来源期刊

Atmospheric Research 地学-气象与大气科学

CiteScore

9.40

自引率

10.90%

发文量

460

审稿时长

47 days

期刊介绍： The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.