Assessment of Aerosol Optical Depth over Indian Subcontinent during COVID-19 lockdown (March–May 2020)

Gouda, K. C.; Gogeri, Iranna; Thippareddy, Aruna Singanahalli

doi:10.1007/s10661-022-09855-3

Cited by 10 publications

(5 citation statements)

References 61 publications

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“…However, in this study, Moderate Resolution Imaging Spectroradiometer (MODIS) Terra 550-nm level 3 AOD product was used. It is because this data has better consistency compared to other products (Lyapustin, Wang, 2018;Gouda et al, 2022). Specifically, the dataset used in this study is daily and monthly mean combined dark target and deep blue AOD at 550 nm for land and ocean (MOD08 D3 V6.1).…”

Section: Methodsmentioning

confidence: 99%

“…The impact of lockdown on the atmospheric AOD level was widely investigated. An assessment of AOD over the Indian subcontinent during COVID-19 lockdown (March-May 2020) showed the reduction in AOD level was as much as 14.75% during the lockdown period, with spatial variation found in the magnitude from region to region (Gouda et al, 2022). The comparison of AOD of Central-Eastern China (CEC) during the COVID-19 lockdown (January 24-February 29, 2020) with 2021 climatology data showed a decrement of 39.2% and 31.0% over Hubei and Wuhan, respectively (Shen et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Investigation of COVID-19 Impact on Aerosol Optical Depth Over Malaysia and Indonesia

Amin

Mardiah

Adida

et al. 2023

Ekológia (Bratislava)

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Lockdown or movement control order (MCO) was implemented all over the world, including Malaysia and Indonesia, during the coronavirus disease 2019 (COVID-19) pandemic. During the lockdown period, human activities were restricted. The restriction led to the reduction of human-made particulate matter released to the atmosphere. One of the indicators that could be used to estimate the concentration of particulate matter in the atmosphere is aerosol optical depth (AOD). The aim of this study is to investigate the variation in AOD level over the Malaysia and Indonesia region during this restriction period. This study has utilized monthly and daily Moderate Resolution Imaging Spectroradiometer (MODIS) Terra AOD product that can be accessed through National Aeronautics and Space Administration (NASA)’s Geospatial Interactive Online Visualization and Analysis Infrastructure (GIOVANNI) system. The developed long-term time-averaged map showed a high AOD level over Sumatera and South Kalimantan, with the maximum value being 0.4. The comparison among during, pre- and post-lockdown periods showed a reduction in the AOD level. The maximum AOD level decreased to 0.3 during the lockdown period compared to 0.4 in the pre- (2019) and post-lockdown periods (2021 and 2022). Average monthly time series showed no spike in the AOD level in 2020 and 2021. Hovmöller diagram showed low AOD throughout the latitude and longitude during lockdown compared to the pre- and post-lockdown periods. Analyses of the yearly AOD level showed reduction in the AOD level from +11.31% in 2019 to −18.17% and −18.01% in 2020 and 2021, respectively. The result also showed that the average daily AOD percentage during the lockdown period in 2020 had decreased to −5.34% from −3.18% in 2019 and had increased to +1.26 in 2021.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of COVID-19 Impact on Aerosol Optical Depth Over Malaysia and Indonesia

Amin

Mardiah

Adida

et al. 2023

Ekológia (Bratislava)

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“…A spatial analysis of the AOD data revealed that the highest value could be found in the northeastern part of the state (which is subjected to large-scale mining activities and industrial emissions), whereas the southwestern part showed the lowest value. Gouda et al [23] used AOD data from the MODIS sensor on the Terra satellite to investigate the drop in AOD over India during the COVID-19 lockdown period. In India, the northern region has a 22.53% reduction in AOD levels, whereas the southern region has a significantly smaller drop (approx.…”

Section: Introductionmentioning

confidence: 99%

Trend Analysis of Aerosol Concentrations over Last Two Decades from MODIS Retrievals over Hyderabad District of India

A K,

Mathew,

Raja Shekar

2024

GaEE

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Air pollution is one of the grave concerns of the modern era, claiming millions of lives and adversely impacting the economy. Aerosols have been observed to play a significant role in negatively influencing climatological variables and human health in given areas. The current study aimed to study the trend of aerosols and particulates on daily, monthly, seasonal, and annual levels using a 20-year (2002–2021) daily mean aerosol optical depth (AOD) product released by moderate resolution imaging spectrometer (MODIS) sensors for the Hyderabad district in India. The results of the daily mean analysis revealed a rising trend in the number of days with severe AOD (>1), whereas examinations of the seasonal and monthly mean data from 2017 through 2022 showed that peak AOD values alternated between the summer, autumn, and winter seasons over the years. Trend analysis using Mann–Kendall, modified Mann–Kendall, and innovative trend analysis (ITA) tests revealed that AOD increased significantly from 2002 through 2021 (p < 0.05; Z > 0). Furthermore, correlation analysis was performed to check for correlations between AOD levels and certain meteorological factors for the Charminar and Secunderabad regions; it was noticed that temperature had a weak positive correlation with AOD (p < 0.05; r = 0.283 [Secunderabad] – p < 0.05; r = 0.301 [Charminar]), whereas relative humidity developed a very weak negative correlation with AOD (p < 0.05; r = −0.079 [Secunderabad] – p < 0.05; r = −0.109 [Charminar]).

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“…The satellite data can be economical to investigate surface phenomena and atmospheric chemistry over the short and long term. The TROPOspheric Monitoring Instrument or TROPOMI of Sentinel-5 Precursor or S-5 P) provides data related to aerosols, Formaldehyde (HCHO), CH has in uenced air quality at a large scale, and when it comes to monitoring studies over a small region, its effect has gone unmonitored due to a lack of ground observation stations and gaps in satellite data (Dey 2004;Baldasano 2020;Gouda et al 2022). The general objectives of this study are : (a) To estimate the major air pollutants, i.e., aerosols, methane, carbon monoxide, formaldehyde, nitrogen dioxide, and sulfur dioxide, and (b) to assess the spatial anomalies of these pollutants, including aerosol optical depth (AOD) and particulate matter (PM 2.5 ).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of spatial and temporal anomalies of major air pollutants using TROPOMI and MODIS data over the Annamayya district of India

Mogaraju¹

2023

Preprint

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Air pollution can be treated as a ‘now business’ instead of a pending forecast-mediated long-term response, and it needs to be addressed as swiftly as possible. COVID-19 has impacted us in diverse ways hindering our daily life and cautioning us to enhance preparation strategies to yield an immediate and appropriate response. The selected air pollutants in this study are aerosols, methane, carbon monoxide, sulfur dioxide, nitrogen dioxide, and particulate matter derived from aerosol optical depth. The data needed for this study is collected from TROPOMI (Tropospheric measurement instrument) of Sentinel-5 P and MODIS. Three urban centers were selected to know the disparities in air pollutant concentrations using time series plots. The area-averaged maps were produced using data from 2019 to 2022 of selected pollutants. The sulfur dioxide (0.288343), nitrogen dioxide (0.602766), formaldehyde (0.429631), carbon monoxide (0.959546), methane (0.807138), aerosol optical depth (0.852948), aerosol Index (0.936116), and particulate matter (0.852948) concentrations are correlated over temporal scale. The overall understanding as a result of this work is that on a large scale (district level), the effect of COVID-19 on air pollution is relatively obvious, whereas, in small regions, due to a lack of ground observation stations, it is not clear. This kind of work can help the local administration to increase the infrastructure that can help in reducing air pollution and, by extension, improve human health and the environment.

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Assessment of Aerosol Optical Depth over Indian Subcontinent during COVID-19 lockdown (March–May 2020)

Cited by 10 publications

References 61 publications

Investigation of COVID-19 Impact on Aerosol Optical Depth Over Malaysia and Indonesia

Investigation of COVID-19 Impact on Aerosol Optical Depth Over Malaysia and Indonesia

Trend Analysis of Aerosol Concentrations over Last Two Decades from MODIS Retrievals over Hyderabad District of India

Evaluation of spatial and temporal anomalies of major air pollutants using TROPOMI and MODIS data over the Annamayya district of India

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