一次蘇南大暴雨過程數(shù)值模擬及其對交通能見度的影響

doi:10.3969/2013jms.0011

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一次蘇南大暴雨過程數(shù)值模擬及其對交通能見度的影響
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                        10.3969/2013jms.0011
                    
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基金項(xiàng)目:江蘇省科技支撐計(jì)劃（BE2010750）；公益性行業(yè)（氣象）科研專項(xiàng)（GYHY201106001）；江蘇省高校優(yōu)勢學(xué)科建設(shè)工程

Numerical simulation on a torrential rain and its influence on traffic visibility in southern Jiangsu

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利用0.5°×0.5°的GFS分析場數(shù)據(jù)和中尺度數(shù)值模式WRF，對2011年6月17—18日發(fā)生在江蘇省南部地區(qū)覆蓋滬寧、沿江及寧常高速公路的一次大暴雨天氣過程進(jìn)行了數(shù)值模擬和診斷分析。經(jīng)過AWMS實(shí)測數(shù)據(jù)及常規(guī)氣象觀測資料的驗(yàn)證，得到如下結(jié)論：（1）WRF模式對此次大暴雨過程的模擬結(jié)果較為理想，具有良好的預(yù)報(bào)能力；（2）高低空急流的耦合是本次降水過程爆發(fā)的主要動力機(jī)制，西南低空急流為此次降水提供了水汽輸送通道；（3）雨區(qū)上空的垂直螺旋度在低層為正、高層為負(fù)；（4）干空氣的活動對強(qiáng)降水的形成具有一定的指示作用；（5）強(qiáng)降水是導(dǎo)致公路交通能見度降低的重要因素，且水平能見度與降水強(qiáng)度成負(fù)指數(shù)關(guān)系。

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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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湯繼濤,袁成松,包云軒,謝曉金.一次蘇南大暴雨過程數(shù)值模擬及其對交通能見度的影響.氣象科學(xué),2014,34(3):275-281 TANG Jitao, YUAN Chengsong, BAO Yunxuan, XIE Xiaojin. Numerical simulation on a torrential rain and its influence on traffic visibility in southern Jiangsu. Journal of the Meteorological Sciences,2014,34(3):275-281

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收稿日期:2012-10-26
最后修改日期:2013-01-29
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在線發(fā)布日期: 2014-07-11
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