熱帶氣旋影響下2007—2021年蘇皖地區(qū)龍卷活動情況及環(huán)境特征統(tǒng)計(jì)分析

doi:10.12306/2023jms.0019

首頁 > 過刊瀏覽>2024年第44卷第4期 >663-672. DOI:10.12306/2023jms.0019

熱帶氣旋影響下2007—2021年蘇皖地區(qū)龍卷活動情況及環(huán)境特征統(tǒng)計(jì)分析
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                        10.12306/2023jms.0019
                    
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中圖分類號:P445.1
基金項(xiàng)目:國家重點(diǎn)專項(xiàng)課題資助項(xiàng)目(2018YFC1506104);第二次青藏高原綜合科學(xué)考察研究資助項(xiàng)目(2019QZKK010408);氣象預(yù)報(bào)業(yè)務(wù)關(guān)鍵技術(shù)發(fā)展專項(xiàng)(YBGJXM2020-04-01)

Statistical analysis of tornado activity and environmental characteristics under the influence of tropical cyclones in Jiangsu and Anhui area from 2007 to 2021

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本文收集并統(tǒng)計(jì)了2007—2021年熱帶氣旋(Tropical Cyclone, TC)影響下蘇皖地區(qū)的65次龍卷記錄,其中TC(登陸)龍卷24次,TC(海上)龍卷41次。江蘇龍卷多于安徽,呈南多北少分布,低海拔平原郊區(qū)為易發(fā)地帶,7、8月的午后至傍晚為易發(fā)時(shí)段。登陸TC引發(fā)龍卷時(shí),強(qiáng)度級別主要為熱帶低壓和熱帶風(fēng)暴,多以西北向路徑在福建及浙江沿海登陸,龍卷多出現(xiàn)在以TC為中心300~550 km的東北象限,該區(qū)域內(nèi)存在中等強(qiáng)度的不穩(wěn)定能量、強(qiáng)的低層切變以及大的風(fēng)暴相對螺旋度和能量螺旋度。海上TC引發(fā)龍卷時(shí)的強(qiáng)度級別主要以熱帶風(fēng)暴、強(qiáng)熱帶風(fēng)暴和臺風(fēng)為主,有3種主要移動路徑:偏西路徑、西北路徑和偏北路徑。TC(海上)龍卷發(fā)生時(shí)TC多在25°N以南,此時(shí)蘇皖地區(qū)受副高和TC的共同影響,西南暖濕氣流不斷輸送,配合中緯度的低槽活動,冷暖空氣對峙,有利于龍卷生成,雖動力條件弱于TC(登陸)龍卷,但熱力條件更好,能量螺旋度值較大。

Abstract:

This paper collected and counted 65 times of the tornado records in Jiangsu and Anhui Province under the influence of Tropical Cyclone (TC) from 2007 to 2021 including 24 TC (landing) tornadoes and 41 TC (offshore) tornadoes. There are more tornadoes in Jiangsu than in Anhui, more in the south than in the north. The suburbs of the low altitude plain are prone to occur, and the afternoon to evening in July and August are prone to occur. When landing TC causes tornado, the intensity level is mainly tropical depression and tropical storm. Most of them land in Fujian and Zhejiang coastal areas along the northwest route. Tornadoes mostly appear in the northeast quadrant of 300-550 km with TC as the center. There are medium intensity unstable energy, strong low-level shear, and large storm relative helicity and energy helicity in this area. The intensity level of tornado caused by TC at sea is mainly tropical storm, strong tropical storm and typhoon, and there are three main moving paths: the path to the west, the path to the northwest and the path to the north. When TC (offshore) tornadoes occur, TC is mostly in the south of 25°N. At this time, Jiangsu and Anhui regions are jointly affected by the subtropical high and TC, and the southwest warm and wet air flow is continuously transported. In combination with the low trough activity in the middle latitude, the cold and warm air confrontation is conducive to the formation of tornadoes. Although the dynamic conditions are weaker than TC (landing) tornadoes, the thermal conditions are better, and the energy helicity value is larger.

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鄧意學(xué),肖天貴,湯志亞,史朝,肖藜蕓.熱帶氣旋影響下2007—2021年蘇皖地區(qū)龍卷活動情況及環(huán)境特征統(tǒng)計(jì)分析.氣象科學(xué),2024,44(4):663-672 DENG Yixue, XIAO Tiangui, TANG Zhiya, SHI Zhao, XIAO Liyun. Statistical analysis of tornado activity and environmental characteristics under the influence of tropical cyclones in Jiangsu and Anhui area from 2007 to 2021. Journal of the Meteorological Sciences,2024,44(4):663-672

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收稿日期:2022-11-10
最后修改日期:2023-03-06
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在線發(fā)布日期: 2024-09-23
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