Spatial and altitudinal contrast in aerosol radiative properties across the Indo-Gangetic plain

Vaishya, A and Suresh Babu, S and Jayachandran, V and Gogoi, MM and Lakshmi, NB and Krishna Moorthy, K and Satheesh, SK (2019) Spatial and altitudinal contrast in aerosol radiative properties across the Indo-Gangetic plain. In: 2019 URSI Asia-Pacific Radio Science Conference, AP-RASC 2019, 9 March 2019-15 March 2019, New Delhi.

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Abstract

With a view to understanding the vertical distribution of aerosols and estimating the radiative impacts of elevated aerosols in the lower free troposphere, extensive profiling of the vertical variation of the optical properties, namely the extinction/ scattering and absorption coefficients (respectively ext / scat / abs) have been carried out from three base stations in the Indo-Gangetic Plain (IGP) using an instrumented aircraft, prior to onset of the Indian Summer Monsoon. These stations represented the semiarid western IGP (Jodhpur, JDR), the anthropogenically affected central IGP (Varanasi, VNS), and the industrialized coastal location in the eastern end of the IGP, close to the northern Bay of Bengal (Bhubaneswar, BBR). The vertical profiles of the optical properties differed significantly across these locations and this resulted in a regionally significant heating rate gradient. While the integrated (ground to 3 km altitude) scat remained quite comparable across the IGP, the highest abs and hence the lowest single scattering albedo (SSA) occurred in the central IGP (Varanasi). Size distribution, inferred from the spectral variation of the scattering coefficient, showed a gradual shift from coarse particle dominance in the western IGP to strong accumulation dominance in the eastern coast, with the central IGP coming in-between. Source speciation of aerosol, using spectral aerosol properties, revealed aerosol system in the west IGP is predominantly natural (dust and sea-salt) and that in the east IGP is highly anthropogenic type (industrial emissions, fossil fuel and biomass combustion).The central IGP exhibited a mixture of both.

Item Type:	Conference Paper
Publication:	2019 URSI Asia-Pacific Radio Science Conference, AP-RASC 2019
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Aerosols; Combustion; Fossil fuels; Industrial emissions, Indian summer monsoon; Indo-Gangetic Plains; Radiative properties; Scattering and absorption; Scattering co-efficient; Single scattering albedo; Vertical distributions; Vertical variation, Optical properties
Department/Centre:	Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Date Deposited:	13 Dec 2022 04:19
Last Modified:	13 Dec 2022 04:19
URI:	https://eprints.iisc.ac.in/id/eprint/78304

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