| 一次苏南大暴雨过程数值模拟及其对交通能见度的影响 |
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| 引用本文： | 汤继涛,袁成松,包云轩,谢晓金.一次苏南大暴雨过程数值模拟及其对交通能见度的影响[J].气象科学,2014,34(3):275-281. |
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| 作者姓名： | 汤继涛 袁成松 包云轩 谢晓金 |
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| 作者单位： | 南京信息工程大学 江苏省农业气象重点实验室, 南京 210044;南京信息工程大学 教育部陆地碳水循环与气候变化创新团队, 南京 210044;南京信息工程大学 江苏省农业气象重点实验室, 南京 210044;江苏省气象科学研究所, 南京 210008;南京信息工程大学 江苏省农业气象重点实验室, 南京 210044;南京信息工程大学 教育部陆地碳水循环与气候变化创新团队, 南京 210044;南京信息工程大学 江苏省农业气象重点实验室, 南京 210044;南京信息工程大学 教育部陆地碳水循环与气候变化创新团队, 南京 210044 |
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| 基金项目： | 江苏省科技支撑计划（BE2010750）；公益性行业（气象）科研专项（GYHY201106001）；江苏省高校优势学科建设工程 |
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| 摘 要： | 利用0.5°×0.5°的GFS分析场数据和中尺度数值模式WRF,对2011年6月17—18日发生在江苏省南部地区覆盖沪宁、沿江及宁常高速公路的一次大暴雨天气过程进行了数值模拟和诊断分析。经过AWMS实测数据及常规气象观测资料的验证,得到如下结论:(1)WRF模式对此次大暴雨过程的模拟结果较为理想,具有良好的预报能力;(2)高低空急流的耦合是本次降水过程爆发的主要动力机制,西南低空急流为此次降水提供了水汽输送通道;(3)雨区上空的垂直螺旋度在低层为正、高层为负;(4)干空气的活动对强降水的形成具有一定的指示作用;(5)强降水是导致公路交通能见度降低的重要因素,且水平能见度与降水强度成负指数关系。
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| 关 键 词： | 暴雨 WRF 数值模拟 水平能见度 高速公路 |
| 收稿时间： | 2012/10/26 0:00:00 |
| 修稿时间： | 2013/1/29 0:00:00 |
Numerical simulation on a torrential rain and its influence on traffic visibility in southern Jiangsu |
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| TANG Jitao,YUAN Chengsong,BAO Yunxuan and XIE Xiaojin.Numerical simulation on a torrential rain and its influence on traffic visibility in southern Jiangsu[J].Scientia Meteorologica Sinica,2014,34(3):275-281. |
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| Authors: | TANG Jitao YUAN Chengsong BAO Yunxuan and XIE Xiaojin |
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| Institution: | Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China;'Carbon and Water Cycle in Land' Innovation Team, Ministry of Education, Nanjing University of Information Science & Technology, Nanjing 210044, China;Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China;Jiangsu Meteorological Institute, Nanjing 210008, China;Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China;'Carbon and Water Cycle in Land' Innovation Team, Ministry of Education, Nanjing University of Information Science & Technology, Nanjing 210044, China;Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China;'Carbon and Water Cycle in Land' Innovation Team, Ministry of Education, Nanjing University of Information Science & Technology, Nanjing 210044, China |
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| Abstract: | Based on the 0.5°×0.5° analysis field data from GFS (Global Forecasting System), with a mesoscale numerical model WRF (Weather Research and Forecasting model) for Version 3.1.1, a torrential rain occurred in the southern Jiangsu covered the Shanghai-Nanjing Expressway, the Yanjiang Expressway and the Nanjing-Changzhou Expressway during 17 to 18, June, 2011 was simulated and diagnosticaly analyzed. The verification of the observed data from AWMS (Automatic Weather Monitoring System) and the conventional meteorological stations was displayed as follows: (1) WRF model has a good forecasting ability in a rainfall process because of its ideal simulations and diagnostic analysis; (2) the coupling of the low-level and upper-level jet was the main dynamical mechanism of the outbreaking of this torrential rain process and the southwest low-level jet provided a conveying passageway of water vapor for the engendering of this heavy rain; (3) the vertical helicity at the upper levels was negative while at the lower levels, it was positive; (4) the activity of dry air played an important role in the engendering of heavy rainfall; (5) heavy rainfall is one of the serious factors influencing the visibility of transportation. The relationship between the horizontal visibility and rainfall strength on the expressways was negative exponential. |
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| Keywords: | Heavy rainfall WRF Numerical simulation Horizontal visibility Expressway |
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