Statistically decreased weakening rate of typhoons in environments of the Northeast China cold vortex

IF 2.5 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Dajun Zhao, Na Wei, Yubin Yu, Xin Zhang, Qian Wang, Jinjie Song
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引用次数: 0

Abstract

The impact of the Northeast China Cold Vortex (NCCV) on tropical cyclone (TC) intensity change was studied based on statistics, revealing a significant decrease in the rate of TC weakening and a lower probability of rapid weakening (RW) in the environments of NCCVs. This is mainly attributable to the external dynamic forcing induced by the NCCV as the eddy angular momentum import at upper levels increases significantly, which offsets the unfavorable decrease in sea surface temperature and increase in vertical wind shear. The upper-level positive potential vorticity anomaly band from the NCCV involves into the TC circulation from the southwestern quadrant, helping the development of convections triggered in the downshear right side of the TC. These results elucidate a fundamental relationship between TCs and NCCVs, and the findings contribute to a deeper comprehension of TC behavior under the influence of NCCVs, thereby providing guidance for forecasting intensity changes of TCs entering mid-latitude regions.
中国东北冷涡环境下台风减弱率的统计下降率
基于统计数据研究了中国东北冷涡对热带气旋强度变化的影响,发现在中国东北冷涡环境下,热带气旋的减弱率显著下降,快速减弱(RW)的概率降低。这主要归因于NCCV引起的外部动力强迫,因为高层涡旋角动量输入显著增加,抵消了海面温度下降和垂直风切变增加的不利影响。NCCV产生的高层正位势涡度异常带从西南象限进入TC环流,有助于TC右侧下切变引发的对流的发展。这些结果阐明了TC与NCCV之间的基本关系,有助于深入理解NCCV影响下的TC行为,从而为预报进入中纬度地区的TC强度变化提供指导。
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来源期刊
Environmental Research Communications
Environmental Research Communications ENVIRONMENTAL SCIENCES-
CiteScore
3.50
自引率
0.00%
发文量
136
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