印度北部寒潮的综合动态:独特寒潮条件的基本机制

IF 6.1 1区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
K.S. Athira , Raju Attada , V. Brahmananda Rao
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引用次数: 0

摘要

印度北部地区爆发的冷空气对人类健康、能源、农业和交通产生了重大影响。在这项工作中,我们研究了 1982-2020 年冬季寒潮的天气动力学及其与大尺度环流的联系。根据强度将寒潮分为正常寒潮和强烈寒潮(NCWs 和 ICWs),并研究寒潮形成的基本机制及其大气驱动因素。值得注意的是,国际寒潮的空间范围几乎是正常寒潮的两倍,因此有可能影响到更广泛的人群。NCWs经常受到西部扰动的影响,导致冷空气从西伯利亚(浅高地区)流入。与此相反,ICW 主要与乌拉尔-西伯利亚地区上空存在的欧米茄区块有关。乌拉尔气块的下游部分有利于寒冷的北风流入印度北部,导致冷空气平流和极端寒潮条件。通过显著的准共振放大(QRA)指纹,进一步证实了北极变暖对 ICW 的影响。此外,拉尼娜现象似乎在引发印度北部的 ICW 方面发挥了关键作用。在拉尼娜现象期间,突出的低层气旋异常有助于将冷空气从高纬度地区移入印度。与厄尔尼诺年和中性年相比,拉尼娜年的寒潮发生频率和持续时间也更长。对印度北部寒潮事件的趋势分析表明,在分析期间,由于冬季最低气温上升(由于全球变暖)、冬季天气同步系统数量减少和北极放大效应等各种因素的综合作用,寒潮事件的频率、持续时间和强度都显著下降。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Synoptic dynamics of cold waves over north India: Underlying mechanisms of distinct cold wave conditions

The cold air outbreaks in the northern parts of India exert significant impacts on human health, energy, agriculture and transportation. In this study, we investigate the synoptic dynamics of cold waves and their linkages to large scale circulations for the winter period from 1982 to2020. Cold waves are classified into normal and intense (NCWs and ICWs) based on intensity and we examine the underlying mechanisms of formation and their atmospheric drivers. Notably, the spatial extent of the ICWs is almost double than that of normal ones thereby having the potential to affect a wider population. The NCWs are often influenced by western disturbances, leading to the inflow of cold air from Siberia (a region of shallow high). In contrast, ICWs are mostly linked to the presence of an omega block over the Ural-Siberian region. The downstream portion of the Ural block favours the inflow of cold northerlies into north India, leading to cold air advection and extreme cold wave conditions. The influence of Arctic warming for ICWs is further confirmed through a prominent Quasi-Resonant Amplification (QRA) fingerprint. Furthermore, La Niña condition seems to play a crucial role in triggering ICWs over north India. During La Niña, the prominent low level cyclonic anomaly helps in advecting the cold air from the higher latitudes into the country. The frequency as well as the duration of cold wave events are also found to be higher in La Niña years compared to El Niño and neutral years. The trend analysis of cold wave events over north India reveals a significant decrease in the frequency, duration and intensity during the analysis period due to a combination of various factors such as rising winter minimum temperatures (due to global warming), decreasing number of synoptic winter weather systems and Arctic amplification.

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来源期刊
Weather and Climate Extremes
Weather and Climate Extremes Earth and Planetary Sciences-Atmospheric Science
CiteScore
11.00
自引率
7.50%
发文量
102
审稿时长
33 weeks
期刊介绍: Weather and Climate Extremes Target Audience: Academics Decision makers International development agencies Non-governmental organizations (NGOs) Civil society Focus Areas: Research in weather and climate extremes Monitoring and early warning systems Assessment of vulnerability and impacts Developing and implementing intervention policies Effective risk management and adaptation practices Engagement of local communities in adopting coping strategies Information and communication strategies tailored to local and regional needs and circumstances
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