Surprising Changes in Aerosol Loading over India amid COVID-19 Lockdown
Abstract Using ground-based and satellite observation along with aerosol reanalysis products, we show a widespread reduction in aerosol loading over the Indian subcontinent during the COVID-19 (COronaVIrus Disease 2019) lockdown. The pre-lockdown and lockdown period considered in the present study i...
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| Format: | Article |
| Language: | English |
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Springer
2020-11-01
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| Series: | Aerosol and Air Quality Research |
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| Online Access: | https://doi.org/10.4209/aaqr.2020.07.0466 |
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| author | Satyendra K. Pandey V. Vinoj |
| author_facet | Satyendra K. Pandey V. Vinoj |
| author_sort | Satyendra K. Pandey |
| collection | DOAJ |
| description | Abstract Using ground-based and satellite observation along with aerosol reanalysis products, we show a widespread reduction in aerosol loading over the Indian subcontinent during the COVID-19 (COronaVIrus Disease 2019) lockdown. The pre-lockdown and lockdown period considered in the present study is 20th February–20th March 2020 and 24th March–22nd April 2020. In terms of aerosol optical depth (AOD), loading has reduced up to 40% over the most populated region of India. However, the central part of India shows an unexpected increase (~+20%) in AOD. A simultaneous increase (decrease) in mid-tropospheric relative humidity (wind speed (WS) at 850 hPa) by +85 ± 6.0% (–12 ± 3.9%) occurred during the lockdown. It is found that on a daily scale, the mean AOD is positively (negatively) correlated with mid-tropospheric RH (WS) with a statistically significant linear correlation coefficient of 0.53 (-0.43). An increase (decrease) in RH (WS) of 20% (1 m s–1) was observed to increase AOD by 0.10 (0.04). Thus, we hypothesize that during the lockdown, the increased AOD over central India was due to increased atmospheric moisture coupled with stagnant circulation condition. |
| format | Article |
| id | doaj-art-4e4681826cb547ce923972c7326bd5f3 |
| institution | Kabale University |
| issn | 1680-8584 2071-1409 |
| language | English |
| publishDate | 2020-11-01 |
| publisher | Springer |
| record_format | Article |
| series | Aerosol and Air Quality Research |
| spelling | doaj-art-4e4681826cb547ce923972c7326bd5f32025-02-09T12:20:07ZengSpringerAerosol and Air Quality Research1680-85842071-14092020-11-0121311210.4209/aaqr.2020.07.0466Surprising Changes in Aerosol Loading over India amid COVID-19 LockdownSatyendra K. Pandey0V. Vinoj1School of Earth, Ocean and Climate Science Indian Institute of Technology BhubaneswarSchool of Earth, Ocean and Climate Science Indian Institute of Technology BhubaneswarAbstract Using ground-based and satellite observation along with aerosol reanalysis products, we show a widespread reduction in aerosol loading over the Indian subcontinent during the COVID-19 (COronaVIrus Disease 2019) lockdown. The pre-lockdown and lockdown period considered in the present study is 20th February–20th March 2020 and 24th March–22nd April 2020. In terms of aerosol optical depth (AOD), loading has reduced up to 40% over the most populated region of India. However, the central part of India shows an unexpected increase (~+20%) in AOD. A simultaneous increase (decrease) in mid-tropospheric relative humidity (wind speed (WS) at 850 hPa) by +85 ± 6.0% (–12 ± 3.9%) occurred during the lockdown. It is found that on a daily scale, the mean AOD is positively (negatively) correlated with mid-tropospheric RH (WS) with a statistically significant linear correlation coefficient of 0.53 (-0.43). An increase (decrease) in RH (WS) of 20% (1 m s–1) was observed to increase AOD by 0.10 (0.04). Thus, we hypothesize that during the lockdown, the increased AOD over central India was due to increased atmospheric moisture coupled with stagnant circulation condition.https://doi.org/10.4209/aaqr.2020.07.0466COVID-19LockdownAerosolsAir pollutionHumidity |
| spellingShingle | Satyendra K. Pandey V. Vinoj Surprising Changes in Aerosol Loading over India amid COVID-19 Lockdown Aerosol and Air Quality Research COVID-19 Lockdown Aerosols Air pollution Humidity |
| title | Surprising Changes in Aerosol Loading over India amid COVID-19 Lockdown |
| title_full | Surprising Changes in Aerosol Loading over India amid COVID-19 Lockdown |
| title_fullStr | Surprising Changes in Aerosol Loading over India amid COVID-19 Lockdown |
| title_full_unstemmed | Surprising Changes in Aerosol Loading over India amid COVID-19 Lockdown |
| title_short | Surprising Changes in Aerosol Loading over India amid COVID-19 Lockdown |
| title_sort | surprising changes in aerosol loading over india amid covid 19 lockdown |
| topic | COVID-19 Lockdown Aerosols Air pollution Humidity |
| url | https://doi.org/10.4209/aaqr.2020.07.0466 |
| work_keys_str_mv | AT satyendrakpandey surprisingchangesinaerosolloadingoverindiaamidcovid19lockdown AT vvinoj surprisingchangesinaerosolloadingoverindiaamidcovid19lockdown |