| 利用SCIT算法分析江淮地区对流云特征 |
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| 引用本文： | 鲁德金,吴欢,袁野,吴林林,金祺.利用SCIT算法分析江淮地区对流云特征[J].气象科学,2021,41(4):543-550. |
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| 作者姓名： | 鲁德金 吴欢 袁野 吴林林 金祺 |
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| 作者单位： | 安徽省气象局 人工影响天气办公室, 合肥 230031;中国气象局 气象干部培训学院安徽分院, 合肥 230031 |
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| 基金项目： | 国家重点基础研究发展计划资助项目（2019YFC1510303） |
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| 摘 要： | 本文设计了一种运用SCIT算法提取雷达拼图中对流云特征量的方法:用SCIT算法识别并追踪云体,算法中只用一个反射率阈值识别对流单体、云体边界;使用模糊逻辑法区分层状云和对流云,提取对流云雷达特征量。使用该方法提取了2013—2015年江淮地区夏季对流云的雷达特征量,并对雷达特征量与降水量分布的关系进行统计分析。结果表明:江淮地区夏季对流云中生命史为13～30 min的对流云比较多,约占总数的60%;生命史大于30 min的对流云较少,并具有平均回波强度、VIL、冷层厚度较大的特征,其最大回波强度和VIL与降水量的相关性较好。
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| 关 键 词： | SCIT算法 对流云 特征量 降水量 |
| 收稿时间： | 2020/7/17 0:00:00 |
Analysis of convective cloud characteristics in Jianghuai region by SCIT algorithm |
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| LU Dejin,WU Huan,YUAN Ye,WU Linlin,JIN Qi.Analysis of convective cloud characteristics in Jianghuai region by SCIT algorithm[J].Scientia Meteorologica Sinica,2021,41(4):543-550. |
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| Authors: | LU Dejin WU Huan YUAN Ye WU Linlin JIN Qi |
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| Institution: | Weather Modification Office of Anhui, Hefei 230031, China;Anhui Branch of China Meteorological Administration Training Centre, Hefei 230031, China |
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| Abstract: | A method of extracting convective cloud features from radar mosaic by using SCIT algorithm was designed. In the algorithm, only one reflectivity threshold was used to identify the convective cell and cloud boundary, and the fuzzy logic method was used to extract the radar features of convective clouds. This method was used to extract the radar characteristics of summer convective clouds over the Jianghuai region from 2013 to 2015, and to analyze statistically the relationship between radar characteristics and precipitation distribution. Results show that there are more convective clouds with a life history of 13-30 min in summer over Jianghuai region, accounting for 60% of the total,and the convective clouds with life history more than 30 minutes are less, which have the characteristics of average echo intensity, VIL and cold layer thickness. Moreover, the maximum echo intensity and VIL have good correlation with precipitation. |
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| Keywords: | SCIT algorithm convective cloud characteristics precipitation |
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