• CN 62-1175/P
• ISSN 1006-7639

### Diurnal Variation Characteristics of Summer Precipitation in Zhejiang Province During 2004-2016

• Online:2019-02-28 Published:2019-02-28

### 2004—2016年浙江省夏季降水的日变化特征

1. 浙江省气象服务中心，浙江杭州310017
• 作者简介:王颖（1982— ），女，江苏丰县人，硕士，主要从事应用气象学研究. E-mail:120252112@qq.com。
• 基金资助:

浙江省气象局一般项目“基于数据挖掘的气象服务‘数字旬历’研究（2018YB06） ”和浙江省基础公益研究计划项目“浙江省精细化旅游气象服务技术研究（GF18D050003）”共同资助

Abstract:

Based on hourly precipitation data from 71 meteorological stations in Zhejiang Province, the diurnal variation of summer precipitation from 2004 to 2016 were analyzed. The results are as follows: (1) The diurnal variations of summer precipitation amount and frequency were about double-peak structure with the main peak and the sub-peak, the main peak of precipitation amount and frequency appeared around 17:00 and 19:00, respectively. The precipitation and frequency showed an obvious increasing trend in the past 13 years. (2) The diurnal variation of precipitation was distinct in different regions of Zhejiang Province. There were small fluctuations of the diurnal variation of precipitation amount, frequency, and intensity in the west-central Zhejiang Province and coastal islands, with peaks appearing from 09:00 to 11:00, while precipitation amount, frequency, and intensity in the south of Zhejiang Province was characterized by a single peak, which appeared from 15:00 to 20:00. (3) The diurnal variation of precipitation was related to precipitation events with different durations. The accumulated rainfall peak of precipitation events with long-duration (more than and equal to 6 h) in Zhejiang Province appeared at 09:00, and the accumulated rainfall of the short-duration precipitation events within 6 hours reached the peak from 15:00 to 20:00. The rainfall of the western region and the coastal islands in Zhejiang Province was the result of long-duration precipitation and short-term precipitation events. The rainfall was mainly due to the contribution of short-duration precipitation events in southern Zhejiang Province. (4) The short-duration heavy precipitation (20-50 mm·h-1) and special heavy precipitation (≥50 mm·h-1) mainly occurred in the eastern coastal areas such as Wenzhou, Taizhou, and Ningbo, thereinto, Hangzhou Bay and local area in Taizhou were high frequency area of extremely heavy short-time precipitation,and their diurnal variation was characterized by a significant peak from 15:00 to 22:00.

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