| 汉江流域盛夏暴雨与天气尺度瞬变波EP通量的可能联系 |
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| 引用本文： | 黎颖,张小峰,姚静.汉江流域盛夏暴雨与天气尺度瞬变波EP通量的可能联系[J].新疆气象,2021,15(2):42-48. |
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| 作者姓名： | 黎颖 张小峰 姚静 |
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| 作者单位： | 汉中市气象局;汉台区气象台;陕西省气象台;陕西省气候中心 |
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| 基金项目： | 2021年中国气象局创新发展专项(XFZ2021Z034);2020年中国气象局预报员专项(CMAYBY2020-133);陕西省山洪地质灾害气象保障工程2019年建设项目。 |
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| 摘 要： | 利用1980—2015年ERA-5全球再分析资料,对汉中地区典型暴雨发生前纬向风场变化及天气尺度瞬变波活动(Eliassen-Palm通量特征)进行分析。结果表明:瞬变波Eliassen-Palm(EP)通量特征分析为汉江流域暴雨潜势预报提供一个有利的参考指标;暴雨发生前,33°N附近200 h Pa有纬向风减速中心,对应200 hPa为EP通量辐散区,这种垂直分布模型是暴雨前期的有利形势,随着纬向风减速趋势加快,EP通量辐散区扩展并加强,有利于暴雨的发生;与8月相比,7月暴雨强度更强,暴雨范围更广,纬向风变化更明显,200 hPa的EP通量辐散更强。若简单地将盛夏暴雨整体进行研究,会影响对不同月份瞬变波活动及大气环流变化趋势的诊断,造成诊断偏差且难以准确反映瞬变波与暴雨的联系。因此在讨论盛夏季天气尺度瞬变波与对流层环流的相互作用时,应按月份讨论。
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| 关 键 词： | 汉中地区 暴雨 瞬变波 EP通量 |
| 收稿时间： | 2019/11/12 0:00:00 |
| 修稿时间： | 2020/1/13 0:00:00 |
Possible Relationship between rainstorm and EP flux of weather scale transient waves in July and August in the Hanjiang River Basin |
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| liying,zhang xiao feng and yao jing.Possible Relationship between rainstorm and EP flux of weather scale transient waves in July and August in the Hanjiang River Basin[J].Bimonthly of Xinjiang Meteorology,2021,15(2):42-48. |
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| Authors: | liying zhang xiao feng and yao jing |
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| Institution: | (Hanzhong Meteorological Bureau,Hanzhong 723000,China;Hantai Meteorological Bureau,Hanzhong 723000;Shaanxi Meteorological Observatory,Xi'an 714000,China;Shaanxi Climate Center,Xi'an 710014,China) |
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| Abstract: | Based on the ERA-5 global reanalysis data from 1980 to 2015,the zonal wind field changes and weather scale transient wave activity(Eliassen-Palm flux characteristics)before the typical heavy rainstorm occurred in Hanzhong were analyzed.The results show that the transient flux Eliassen-Palm flux(EP flux)characteristics analysis provides a favorable reference index for the rainstorm potential forecast in Hanzhong.Before the rainstorm occurs,there is a zonal wind deceleration center near the region of 33°N at 200 hPa,corresponding to 200 hPa for EP flux divergence district,this vertical distribution model is a favorable situation in the early rainstorm period.As the zonal wind deceleration trend is strengthened,the EP flux divergence zone expands and strengthens,which is conducive to the occurrence of heavy rainstorm.In July,the intensity of rainstorm is stronger than that in August.The range of heavy rainstorm is wider,the zonal wind changes more obviously,and the synoptic scale transient wave EP flux divergence above 200 hPa is stronger.If we simply study the summer rainstorm as a whole,it will affect the diagnosis of weather scale transient wave activity and atmospheric circulation trends in different months,which will cause diagnostic bias and it is difficult to accurately reflect the relationship between transient waves and heavy rainstorm.Therefore,when discussing the interaction between the transient summer synoptic scale transient wave and the tropospheric circulation,it should be discussed separately for different months. |
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| Keywords: | Hanzhong rainstorm transient wave EP flux |
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