Understanding the Influence of Meteorology and Emission Sources on PM 2.5 Mass Concentrations Across India: First Results From the COALESCE Network

Maheshwarkar, Prem and Ralhan, Akarsh and Qureshi, Asif and et al, . (2022) Understanding the Influence of Meteorology and Emission Sources on PM 2.5 Mass Concentrations Across India: First Results From the COALESCE Network. Journal of Geophysical Research: Atmospheres, 127 (4). ISSN 2169-897X

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Abstract

The Carbonaceous Aerosol Emissions, Source Apportionment and Climate Impacts (COALESCE) is a multi-institutional Indian network project to better understand carbonaceous aerosol induced air quality and climate effects. This study presents time synchronized measurements of surface PM2.5 concentrations made during 2019 at 11 COALESCE sites across India. The network median PM2.5 concentration was 42 μg m−3 with the highest median value at Rohtak (99 μg m−3) and the lowest median value at Mysuru (26 μg m−3). The influence of six meteorological parameters on PM2.5 were evaluated. Causality analysis suggested that temperature, surface pressure, and relative humidity were the most important factors influencing fine PM mass, on an annual as well as seasonal scale. Further, a multivariable linear regression model showed that, on an annual basis, meteorology could explain 16%–41% of PM2.5 variability across the network. Concentration Weighted Trajectories (CWT) together with the results of causality analysis revealed common regional sources affecting PM2.5 concentrations at multiple regional sites. Further, CWT source locations for all sites across the network correlated with the SMoG-India emissions inventory at the 95th percentile confidence. Finally, CWT maps in conjunction with emissions inventory were used to obtain quantitative estimates of anthropogenic primary PM2.5 sectoral shares from a mass-meteorology-emissions reconciliation, for all 11 pan-India network sites. These estimates can help guide immediate source reduction and mitigation actions at the national level. © 2022. American Geophysical Union. All Rights Reserved.

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IITH Creators:

IITH Creators	ORCiD
Qureshi, Asif	UNSPECIFIED

Item Type:

Article

Additional Information:

This work was supported by the Ministry of Environment, Forest and Climate Change (MoEF&CC), Government of India, under the NCAP‐COALESCE project {Grant No.14/10/2014‐CC (Vol.II)}. The views expressed in this document are solely those of authors and do not necessarily reflect those of the Ministry. The Ministry does not endorse any products or commercial services mentioned in this publication. The authors thank the internal review committee of the NCAP‐COALESCE project for their comments and suggestions on this paper. The authors gratefully acknowledge all field staff for support with sampling across the network. The authors also acknowledge the Goddard Earth Sciences Data and Information Services Center (GES DISC) for providing MERRA‐2 data and NOAA Air Resources Laboratory (ARL) for providing the HYSPLIT transport and dispersion model ( https://www.ready.noaa.gov ) used in this publication.

Uncontrolled Keywords:

anthropogenic primary PM2.5 shares; COALESCE; concentration weighted trajectories; convergent cross mapping; pan-India PM2.5

Subjects:

Others > Environmental Sciences
Others > Science & Technology
Civil Engineering

Divisions:

Department of Civil Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

18 Jul 2022 11:13

Last Modified:

18 Jul 2022 11:13