文章摘要
相似路径台风“摩羯”和“温比亚”影响南通降水差异成因分析
Analysis on precipitation difference between the similar track typhoons "Yagi"(1814) and "Rumbia"(1818) in Nantong
投稿时间:2021-08-07  修订日期:2021-10-25
DOI:
中文关键词: 台风“摩羯”  台风“温比亚”  降水差异  成因分析
英文关键词: Typhoon “Yagi”  typhoon “Rumbia”  precipitation difference  cause analysis
基金项目:国家自然科学基金(G41805016);高原与盆地暴雨旱涝灾害四川省重点实验室开放研究基金(SZKT201904);南通市气象科研开发项目(NQK202001、NQK202004)
作者单位邮编
李超 南通市气象局 226018
梅一清 南通市气象局 226018
张树民 南通市气象局 226018
顾天真 南通市气象局 226018
张琪 南通市气象局 226018
许冬梅 南京信息工程大学 气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心 210044
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中文摘要:
   为探讨相似路径台风“摩羯”和“温比亚”影响南通降水的差异原因,本文从天气形势、物理量场等方面进行分析,利用水汽通量、假相当位温、湿位涡、垂直螺旋度等物理量对降水进行诊断,得到主要结论如下:1)两台风移动路径主要受副高和冷空气的影响,副高边缘气流为主要引导气流。两台风均有追随200 hPa辐散中心移动的趋势。2)较强冷空气的侵入、鞍形场中的缓慢移动、强正涡度和强盛上升运动、强水汽输送且低空长时间水汽辐合、大气斜压性增强和风垂直切变增大均是台风“温比亚”造成南通更强降水的原因。3)水汽通量辐合增强,低层正涡度中心、强上升运动,低层假相当位温大值区叠加上空假相当位温梯度带,垂直螺旋度增大与正值发展高度均与台风强降水有明显对应。
英文摘要:
   In order to analyse the precipitation difference between the similar track typhoons "Yagi"(1814) and "Rumbia"(1818) in Nantong,the weather situation and physical quantities such as water vapor flux,pseudo-equivalent potential temperature,moist potential vorticit(MPV),vertical helicity are uesd to diagnose in this paper.The main conclusions are as follows:(1)The track of the two typhoons are mainly affected by the subtropical high and cold air, and the air flow at the edge of the subtropical high guides the typhoons.Both typhoons follow the movement trend of divergence center at 200hPa.(2)The intrusion of strong cold air, the slow movement in the saddle field, strong positive vorticity and ?intense?ascending?movement, strong water vapor transport and long-term low-layer water vapor convergence, the enhancement of atmospheric baroclinicity and the increase of wind vertical shear are all the reasons for the heavier precipitation caused by typhoon "Rumbia".(3)The heavy precipitation has a good correspondence with the increases of water vapor flux convergence, the positive vorticity center and intense?ascending movement in the lower layer, the large value regions in the lower layer and upper gradient of the pseudo-equivalent potential temperature, the increase and development height of vertical helicity .
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