2014年8月抚顺一次暴雨天气过程分析 |
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引用本文: | 吴春英,宁大可,赵思文,李俊乐,米雷. 2014年8月抚顺一次暴雨天气过程分析[J]. 商界.城乡致富, 2014, 0(9): 40-42 |
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作者姓名: | 吴春英 宁大可 赵思文 李俊乐 米雷 |
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作者单位: | 辽宁省抚顺市气象局,辽宁抚顺113006 |
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基金项目: | 抚顺市科学技术发展资金计划项目(FSKJHT201393). |
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摘 要: | 利用常规观测、加密自动气象站以及NCEP/NCAR再分析资料,分析了2014年8月24—26日抚顺暴雨过程。结果表明,此次暴雨过程具有持续时间长、影响范围广的特点。其降水具有稳定性和对流性混合性特点。地面低压倒槽、低层切变线和500 hPa西风槽是降水的主要影响系统。850 hPa无低空急流,水汽输送条件不利,但高空急流较为明显,高空水平和垂直辐散为降水产生提供了条件。此次暴雨850 hPa底层有较好的比湿场,为降水提供了较好的水汽条件。24—25日抚顺地区K指数达到34~36℃,为降水提供了不稳定能量。降水前期,抚顺处于Ω形假相当位温场高值区内,为降水提供了高温高湿条件。地形对局地强降水有增强作用。
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关 键 词: | 暴雨 环流特征 低空急流 地形作用 |
Analysis on a Rainstorm Process in Fushun in August 2014 |
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Affiliation: | WU Chun-ying et al (Fushun Mete- orological Bureau of Liaoning Province, Fushun, Liaoning 113006) |
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Abstract: | This paper analyzed a rain-storm process in Fushun during August 24-26 in 2014 according to the data from conventional observation, encrypted automatic weather station and NCEP/NCAR reanalysis data. The results re-vealed that this rainstorm lasted for a long time and affected an extensive area, characterized by both stable and convec-tive precipitations. The storm was affect-ed by an inverted trough of low pressure, a low-level shear line and a 500 hPa westerly trough. No low-level jet was formed at 850 hPa, which was not con-ducive to the water vapor transport. However, due to the strong high-altitude jet, the horizontal and vertical diver-gence made the precipitation possible. The specific humidity field formed at 850 hPa provided suitable water vapor conditions for this storm. The K index of Fushun region during August 24-25 in 2014 reached 34-36℃, which provided unstable energy for this precipitation. In the early period of this precipitation, Fushun was under the high-value area of an Ω-shaped pseudo-equivalent potential temperature field, which provided the high temperature and humidity condi-tions for the precipitation. In addition, the terrain in Fushun region enhanced heavy rainfall. |
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Keywords: | Rainstorm Circulation features Low-level jet Terrain effects |
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