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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Effect of COVID-19 lockdown on the spatio-temporal distribution of nitrogen dioxide over India
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Effect of COVID-19 lockdown on the spatio-temporal distribution of nitrogen dioxide over India

机译：Covid-19锁定对印度氮素二氧化氮时空分布的影响

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摘要

The nationwide lockdown was implemented in India from 25 March 2020 onwards to control the spread of deadly Coronavirus disease 2019 (COVID-19). A sudden shutdown of anthropogenic activities resulted in abrupt decrease of nitrogen dioxide (NO2) across the Indian region. OMI (Ozone Monitoring Instrument) tropospheric column NO2 observations show significantly decreased values during 2020 compared to previous years during 25 March to 19 April. The spatio-temporal variation of tropospheric column NO2 difference between 2020 and average 2017-2019 shows reduction by more than 1 x 10(15) molecules/cm(2) over the Indo Gangetic Plain, eastern and southern India due to lockdown. However, the western Indian region shows slight enhancement which may be attributed to combined effect of transport of polluted air from Middle East and Pakistan, and relatively higher bio-mass burning activity during 2020. A significant reduction is also observed on the surface distribution of NOx (NO + NO2) over different Indian cities due to COVID-19 lockdown. Maximum reduction in daily average surface NOx is observed over Kolkata (65.2 +/- 18.7 ppbv to 30.3 +/- 4.6 ppbv) followed by New Delhi (38.8 +/- 17.5 ppbv to 11.5 +/- 2.9 ppbv) which may be attributed to vehicle fleet, type of fuel used, power plants and industrial emissions.
机译：印度从2020年3月25日起实施全国封锁，以控制2019年致命冠状病毒病（新冠肺炎）的传播。人类活动的突然停止导致整个印度地区二氧化氮（NO2）的突然减少。OMI（臭氧监测仪器）对流层柱NO2观测显示，与前几年3月25日至4月19日期间相比，2020年期间的数值显著下降。2020年与2017-2019年平均值之间对流层柱NO2差异的时空变化表明，由于封锁，印度东部和南部的印度恒河平原上空NO2减少了超过1 x 10（15）分子/cm（2）。然而，印度西部地区表现出轻微的增强，这可能是由于来自中东和巴基斯坦的污染空气输送的综合影响，以及2020年期间相对较高的生物质燃烧活动。在CO2019冠状病毒疾病的封锁下，不同的印度城市NOx（NO+NO2）的表面分布也显著减少。在加尔各答（65.2+/-18.7 ppbv至30.3+/-4.6 ppbv）和新德里（38.8+/-17.5 ppbv至11.5+/-2.9 ppbv）观测到日平均表面NOx的最大减少，这可能归因于车队、所用燃料类型、发电厂和工业排放。

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