Covid-19 lockdown effect on aerosol optical depth in Delhi National Capital Region, India

Q4 Social Sciences

Forum Geografic Pub Date : 2022-12-30 DOI:10.5775/fg.2022.192.d

Sharma Vipasha, Ghosh Swagata, Shahnawaz, R. Praveen, S. Sultan

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引用次数: 0

Abstract

Coronavirus cases in India have been steadily increasing since March 2020. COronaVIrus Disease 2019 (COVID-19) has been managed by a variety of preventative measures. A prominent measure by the Government of India to prevent the spread of Coronavirus Disease 2019 (COVID-19) began on March 25, 2020, with a complete suspension of all outdoor activities throughout the country. Such complete lockdown has resulted in a decrease in anthropogenic emissions, which is partly due to restrictions on human activities. Delhi National Capital Region (NCR), a landlocked area, suffers from high amounts of aerosols due to both natural and anthropogenic sources. The present research focuses on changes in Aerosol Optical Depth (AOD) prior to and during lockdown (initial and second lockdown phases) around satellite cities (Faridabad, Ghaziabad, Gautam Budh Nagar and Gurugram) of Delhi using high-resolution MODIS AOD product. With the implementation of lockdown measures in phase I and phase III of the current study region, AOD decreased dramatically, while phase II and phase IV lockdown phases had a higher concentration of aerosol. An unexpected increase in AOD occurred during the second lockdown compared with the initial lockdown and before the lockdown. Overall, the average percentage change from 2019 to 2020 during first lockdown is -4.44%, while the average percentage change from 2020 to 2021 is 27.63%. © 2022 The Author(s). Published by Forum geografic.

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新冠肺炎封锁对印度德里国家首都地区气溶胶光学深度的影响

自2020年3月以来，印度的冠状病毒病例一直在稳步增加。2019冠状病毒病(COVID-19)通过各种预防措施得到了控制。2020年3月25日，印度政府采取了一项重要措施，防止2019年冠状病毒病(COVID-19)的传播，在全国范围内全面暂停所有户外活动。这种完全封锁导致人为排放减少，部分原因是对人类活动的限制。德里国家首都地区(NCR)是一个内陆地区，由于自然和人为来源，受到大量气溶胶的影响。目前的研究重点是使用高分辨率MODIS AOD产品，研究德里卫星城(法里达巴德、加兹阿巴德、高塔姆布德纳加尔和古鲁格拉姆)在封锁之前和期间(初始和第二封锁阶段)气溶胶光学深度(AOD)的变化。随着本研究区域第一阶段和第三阶段封城措施的实施，AOD急剧下降，而第二阶段和第四阶段的气溶胶浓度较高。与首次封锁和封锁前相比，第二次封锁期间出现了意外的AOD增加。总体而言，2019年至2020年首次封城期间的平均百分比变化为-4.44%，2020年至2021年的平均百分比变化为27.63%。©2022作者。由地理论坛出版。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Forum Geografic Earth and Planetary Sciences-Earth-Surface Processes

CiteScore

0.70

自引率

0.00%

发文量

审稿时长

12 weeks

期刊介绍： Founded in 2002, Forum geografic. Studii de geografie şi protecţia mediului aims to publish high quality research in the domains of geography, environment protection and other related domains. It addresses a range of issues, such as geomorphology, pedology, climatology, hydrology, human geography and environment. Its content is directed to a broad audience, including both academics and policymakers. The papers selected for publication in the journal are subject to a review process using references from universities worldwide.