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Effect Of SARS-CoV-2 Pandemic Induced Lockdown On The Aerosol Loading Over The Coastal State, Goa


Affiliations
1 School of Earth, Ocean and Atmospheric Sciences, Goa University, Goa 403 206, India
 

The SARS-CoV-2 pandemic resulted in India imposing a nationwide lockdown on 22 March 2020, bringing all human activities to a complete halt. The current study focuses on the effect of lockdown on the abundance of atmospheric aerosols over Goa. The study focused on pre-lockdown, lockdown and period corresponding to lockdown in 2019. The AOD spectra depicted a decrease in the anthropogenically derived fine mode aerosols during the lockdown compared to the pre-lockdown period. Mean AOD500 for prelockdown and lockdown periods were 0.43 ± 0.19 and 0.53 ± 0.11 respectively. The higher AOD500 during lockdown was due to an increase in naturally derived coarse mode aerosols, which is further confirmed with the lower Ångström exponent values (1.04 ± 0.11). The mean black carbon mass concentration for the respective periods were 1990.45 ± 470.87 ng m–3 and 1109.71 ± 218.33 ng m–3, and the mean atmospheric forcing during the respective periods were 25.13 ± 5.72 W m–2, 27.31 ± 3.71 W m–2 and 30.81 ± 5.59 W m–2 respectively.

Keywords

Aerosol Optical Depth, Radiative Forcing, SARS-CoV-2.
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  • Zambrano-monserrate, M. A., Alejandra, M. and Sanchez-alcalde, L., Science of the total environment indirect effects of COVID-19 on the environment. Sci. Total Environ., 2020, 728, 138813.

  • Sharma, S., Zhang, M., Anshika, Gao, J., Zhang, H. and Kota, S. H., Effect of restricted emissions during COVID-19 on air quality in India. Sci. Total Environ., 2020, 728, 138878.

  • Charlson, R. J. et al., Climate forcing by anthropogenic aerosols. Science, 1992, 255, 423–430.

  • Ramanathan, V., Crutzen, P. J., Kiehl, J. T. and Rosenfeld, D., Aerosols, climate, and the hydrological cycle. Science, 2001, 294, 2119–2124.

  • Pope III, C. A. and Dockery, D. W., Health effects of fine particulate air pollution: lines that connect health effects of fine particulate air pollution: lines that connect. J. Air Waste Manage. Assoc., 2006, 56, 709–742.

  • Shirodkar, S. and Menon, H. B., Aerosol optical properties over a coastal site in Goa, along the west coast of India. J. Atmos. SolarTerrestrial Phys., 2015, 130, 182–189.

  • Menon, H. B., Shirodkar, S., Kedia, S., Ramachandran, S., Babu, S. and Moorthy, K. K., Temporal variation of aerosol optical depth and associated shortwave radiative forcing over a coastal site along the west coast of India. Sci. Total Environ., 2014, 468, 83–92.

  • Morys, M. et al., Design, calibration, and performance of MICROTOPS II handheld ozone monitor and Sun photometer. J. Geophys. Res. Atmos., 2001, 106, 14573–14582.

  • Frouin, R. et al., Sun and sky radiance measurements and data analysis protocols. NASA/TM-2003-21621/Rev-Vol III, 60, 2003.

  • Krishna Moorthy, K., Satheesh, S. K. and Krishna Murthy, B. V., Investigations of marine aerosols over the tropical Indian Ocean. J. Geophys. Res. Atmos., 1997, 102, 18827–18842.

  • Ångström, A., Techniques of determining the turbidity of the atmosphere. Tellus, 1961, 13, 214–223.

  • Hansen, A. D. A., Rosen, H. and Novakov, T., The aethalometer – an instrument for the real-time measurement of optical absorption by aerosol particles. Sci. Total Environ., 1984, 36, 191–196.

  • Levelt, P. F. et al., Science objectives of the ozone monitoring instrument. IEEE Trans. Geosci. Remote Sens., 2006, 44, 1199– 1208.

  • Hellerman, S. and Rosenstein, M., Normal monthly wind stress over the world ocean with error estimates. J. Phys. Oceanogr., 1983, 13, 1093–1104.

  • Draxler, R. R. and Hess, G. D., Description of the HYSPLIT_4 Modeling System. NOAA Technical Memorandum ERL ARL224, NOAA Air Resour. Lab. Silver Spring, MD, 2004, p. 28.

  • Stein, A. F., Draxler, R. R., Rolph, G. D., Stunder, B. J. B., Cohen, M. D. and Ngan, F., NOAA’s HYSPLIT atmospheric transport and dispersion modeling system. Bull. Am. Meteorol. Soc., 2015, 96, 2059–2077.

  • Ricchiazzi, P., Yang, S., Gautier, C. and Sowle, D., SBDART: A research and teaching software tool for plane-parallel radiative transfer in the earth’s atmosphere. Bull. Am. Meteorol. Soc., 1998, 79, 2101–2114.

  • Hess, M., Koepke, P. and Schult, I., Optical properties of aerosols and clouds: The software package OPAC. Bull. Am. Meteorol. Soc., 1998, 79, 831–844.

  • Nair, S. K., Rajeev, K. and Parameswaran, K., Wintertime regional aerosol distribution and the influence of continental transport over Indian Ocean. J. Atmos. Solar-Terrestrial Phys., 2003, 65, 149–165.

  • Moorthy, K. K. et al., Wintertime spatial characteristics of boundary layer aerosols over peninsular India. J. Geophys. Res. D Atmos., 2005, 110, 1–11.

  • Moorthy, K. K., Satheesh, S. K., Babu, S. S. and Dutt, C. B. S., Integrated campaign for aerosols, gases and radiation budget (ICARB): an overview. J. Earth Syst. Sci., 2008, 117, 243–262.

  • Eck, T. F. et al., Wavelength dependence of the optical depth of biomass burning, urban, and desert dust aerosols. J. Geophys. Res. Atmos., 1999, 104, 31333–31349.

  • Toledano, C. et al., Aerosol optical depth and Ångström exponent climatology at El Arenosillo AERONET site (Huelva, Spain). Q. J. R. Meteorol. Soc. A J. Atmos. Sci. Appl. Meteorol. Phys. Oceanogr., 2007, 133, 795–807.

  • Gogoi, M. M., Suresh Babu, S., Krishna Moorthy, K., Manoj, M. R. and Chaubey, J. P., Absorption characteristics of aerosols over the northwestern region of India: Distinct seasonal signatures of biomass burning aerosols and mineral dust. Atmos. Environ., 2013, 73, 92–102.


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  • Effect Of SARS-CoV-2 Pandemic Induced Lockdown On The Aerosol Loading Over The Coastal State, Goa

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Authors

Atiba A. Shaikh
School of Earth, Ocean and Atmospheric Sciences, Goa University, Goa 403 206, India
Avirup Sen
School of Earth, Ocean and Atmospheric Sciences, Goa University, Goa 403 206, India
Harilal B. Menon
School of Earth, Ocean and Atmospheric Sciences, Goa University, Goa 403 206, India

Abstract


The SARS-CoV-2 pandemic resulted in India imposing a nationwide lockdown on 22 March 2020, bringing all human activities to a complete halt. The current study focuses on the effect of lockdown on the abundance of atmospheric aerosols over Goa. The study focused on pre-lockdown, lockdown and period corresponding to lockdown in 2019. The AOD spectra depicted a decrease in the anthropogenically derived fine mode aerosols during the lockdown compared to the pre-lockdown period. Mean AOD500 for prelockdown and lockdown periods were 0.43 ± 0.19 and 0.53 ± 0.11 respectively. The higher AOD500 during lockdown was due to an increase in naturally derived coarse mode aerosols, which is further confirmed with the lower Ångström exponent values (1.04 ± 0.11). The mean black carbon mass concentration for the respective periods were 1990.45 ± 470.87 ng m–3 and 1109.71 ± 218.33 ng m–3, and the mean atmospheric forcing during the respective periods were 25.13 ± 5.72 W m–2, 27.31 ± 3.71 W m–2 and 30.81 ± 5.59 W m–2 respectively.

Keywords


Aerosol Optical Depth, Radiative Forcing, SARS-CoV-2.

References





DOI: https://doi.org/10.18520/cs%2Fv120%2Fi2%2F360-367