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(1) AEROSOL CLIMATE FORCING AGENTS
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We study aerosol black and brown carbon (BC and BrC) and humic-like substances (HULIS) using coupled chemical-optical approaches to understand their sources, atmospheric processing and effects on regional climate.
we looked into aerosol climate forcing in the Norwegian Arctic as part of the Indian Arctic Expedition, and also in the eastern Indo-Gangetic Plain.
Also, We investigated the BC, BrC and HULIS characteristics to better understand the role of aerosols in the northwestern Himalayas in driving climate change in this vulnerable region. -
(2) SOURCE APPORTIONMENT OF FINE MODE AEROSOL
We chemically speciate fine mode aerosol and employ receptor models for quantitative source apportionment, especially for biomass burning and industrial emissions.
Our major focus so far has been on the eastern IGP and SE Asia. Currently, we are planning to characterize biomass burning and biogenic emissions in the Himalayan context.
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(3) POPULATION EXPOSURE TO AEROSOLS
We characterize human exposure to size-segregated aerosols and associated chemical components in outdoor and indoor settings, and employ particle deposition models to estimate respiratory tract deposition.
This is further expanded into quantitive estimation of aerosol health impact using two metrics - (i) Disease burden and (ii) Oxidative potential.
We are actively involved in studying exposure from residential fuel use in NC India(Bihar) NE India (Assam, Meghalaya, Arunachal Pradesh) and the northwestern Himalayas (Himachal Pradesh, Uttarakhand).
Related papers: Sharma et al., (2024; Environ. Pollut.)
Related paper: Sharma et al., (2024; Environ. Pollut.)
Related papers: Sharma et al., (2023; Sci. Total Environ.); Sharma and Sarkar et al., (2023; Sci. Total Environ.);
Related paper: Sharma and Sarkar et al., (2023; Sci. Total Environ.)
Related paper: Sharma et al., (2023; Sci. Total Environ.)
Related papers: Jia et al., (2020; Sci. Total Environ., 2021; Environ. Pollut.); Sharma et al., (2023; Sci. Total Environ.)
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(4) RECONSTRUCTING HISTORICAL POLLUTANT DEPOSITION
Related papers: Sharma et al., (2024; Environ. Pollut.)
We use remote lake sediments as archives to reconstruct historical pollutant deposition profiles on regional scales. We then compare pollutant deposition fluxes with chemical transport model outputs.
We have previously worked on BC and trace metal deposition profiles in the NE USA and the Finnish Arctic, and are currently working on Himalayan lakes.
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(5) OTHER RESEARCH DIRECTIONS
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Aerosol acidity and its neutralization, and secondary organic carbon
Sharma et al., (2022; Chemosphere); Zhang et al., (2019; Sci. Total Environ.); Jia et al., (2018; Atmos. Chem. Phys.); Jia et al., (2018; Chemosphere), etc. -
Factors affecting long-term tropospheric ozone profiles
Chen et al., (2020; Atmos. Environ.) -
Satellite- and model-based evaluation of long-term aerosol profiles
Zhang et al., (2022; Atmos Chem & Phys Disc. ); Rawat et al., (2019; Atmos. Environ.) -
Source apportionment of road dust-associated trace metals
Kolakkandi et al., (2020; Sci. Total. Environ.) -
Sources and atmospheric processing of tropospheric halocarbons
Sarkar et al., (2018; Sci. Total Environ.)
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Aerosol acidity and its neutralization, and secondary organic carbon