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Synoptic analysis of unexampled super-heavy rainfall on April 1, 2019, in west of Iran
Natural Hazards ( IF 3.3 ) Pub Date : 2020-08-24 , DOI: 10.1007/s11069-020-04232-0
Yousef Ghavidel , Farzaneh Jafari Hombari

The aim of this study is to analyze the synoptic and analyzing the mechanisms of flood occurrence on April 1, 2019, in the western half of Iran. In order to statistically analyze super-heavy precipitation in western Iran, the daily meteorological data from April 2019 for 13 synoptic stations in Kermanshah, Hamadan, and Lorestan Provinces were received and used by the Meteorological Organization. The results show that on the peak day of precipitation in the western half of the country, most stations recorded more than 100 mm of precipitation, the highest of which, 127 mm, occurred at Nahavand station. The arrangement of sea level pressure patterns also indicates the existence of severe pressure gradients between the low pressure in northern Saudi Arabia and western Iran and the high pressure of Siberian and European cold cores, which have created contradictory weather conditions and a strong front at sea level. Also, in the middle and upper levels of the troposphere, with the penetration of cold air flow and cyclonic from Russia and its settlement in West Asia and the region in the form of cutoff low-pressure blocking, severe positive vorticity and divergent and humid ascent flows at all analyzed levels in the western half of the country have been created. Humidity advection maps of 500–1000 hPa levels show that at the 850 and 1000 hPa levels a humidity supply is provided from various sources in the Gulf of Aden, Red Sea, and Mediterranean Sea. But at levels of 500 and 700 hPa, only the Mediterranean Sea plays a key role in supplying and injecting humidity.



中文翻译:

伊朗西部2019年4月1日无例示的超大降雨的天气学分析

这项研究的目的是分析2019年4月1日在伊朗西半部发生的洪水的天气概况和机理。为了统计分析伊朗西部的超大降水,气象组织收到并使用了2019年4月以来在克曼沙赫,哈马丹和洛雷斯坦省的13个天气观测站的每日气象数据。结果表明,在该国西部的降雨高峰日,大多数台站记录的降水量超过100毫米,其中最高的127毫米发生在那哈万德台站。海平面压力模式的排列还表明,在沙特阿拉伯北部和伊朗西部的低压与西伯利亚和欧洲冷核的高压之间存在严重的压力梯度,造成相互矛盾的天气条件,并在海平面形成强大的阵线。另外,在对流层的中高层,随着来自俄罗斯的冷气流和旋风的渗透以及其在西亚和该地区的沉降,以截止低压阻塞,严重的正涡度以及发散和潮湿的上升形式已创建了该国西部地区所有已分析水平的流量。500–1000 hPa水平的湿度对流图显示,在850和1000 hPa水平,从亚丁湾,红海和地中海的各种来源提供了湿度供应。但是在500和700 hPa的水平下,只有地中海在供应和注入湿度中起着关键作用。在对流层中上层,来自俄罗斯的冷气流和气旋的渗透及其在西亚和该地区的定居,表现为截止低压阻塞,严重的正涡度以及上升和发散的湿流。已创建了该国西部的所有分析级别。500–1000 hPa水平的湿度对流图显示,在850和1000 hPa水平,从亚丁湾,红海和地中海的各种来源提供了湿度供应。但是在500和700 hPa的水平下,只有地中海在供应和注入湿度中起着关键作用。在对流层中上层,来自俄罗斯的冷气流和气旋的渗透及其在西亚和该地区的定居,表现为截止低压阻塞,严重的正涡度以及上升和发散的湿流。已创建了该国西部的所有分析级别。500–1000 hPa水平的湿度对流图显示,在850和1000 hPa水平,从亚丁湾,红海和地中海的各种来源提供了湿度供应。但是在500和700 hPa的水平下,只有地中海在供应和注入湿度中起着关键作用。在该国西部地区,在所有分析水平上都产生了严重的正涡度以及发散和潮湿的上升气流。500–1000 hPa水平的湿度对流图显示,在850和1000 hPa水平,从亚丁湾,红海和地中海的各种来源提供了湿度供应。但是在500和700 hPa的水平下,只有地中海在供应和注入湿度中起着关键作用。在该国西部地区,在所有分析水平上都产生了严重的正涡度以及发散和潮湿的上升气流。500–1000 hPa水平的湿度对流图显示,在850和1000 hPa水平,从亚丁湾,红海和地中海的各种来源提供了湿度供应。但是在500和700 hPa的水平下,只有地中海在供应和注入湿度中起着关键作用。

更新日期:2020-08-24
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