Open Access Digital Repository of Ministry of Earth Sciences, Government of India

Influence of monsoons on atmospheric CO2 spatial variability and ground-based monitoring over India

Tiwari, YK and Vellore, RK and Ravi Kumar, K and van der Schoot, M and Cho, CH (2014) Influence of monsoons on atmospheric CO2 spatial variability and ground-based monitoring over India. Science of the Total Environment, 490. pp. 570-578.

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This study examines the role of Asian monsoons on transport and spatial variability of atmospheric CO2 over the Indian subcontinent, using transport modeling tools and available surface observations from two atmospheric CO2 monitoring sites Sinhagad (SNG) and Cape Rama (CRI) in the western part of peninsular India. The regional source contributions to these sites arise from the horizontal flow in conduits within the planetary boundary layer. Greater CO2 variability, greater than 15ppm, is observed during winter, while it is reduced nearly by half during summer. The SNG air sampling site is more susceptible to narrow regional terrestrial fluxes transported from the Indo-Gangetic Plains in January, and to wider upwind marine source regions from the Arabian Sea in July. The Western Ghats mountains appear to play a role in the seasonal variability at SNG by trapping polluted air masses associated with weak monsoonal winds. A Lagrangian back-trajectory analysis further suggests that the horizontal extent of regional sensitivity increases from north to south over the Indian subcontinent in January (Boreal winter). © 2014 Elsevier B.V.

Item Type: Article
Additional Information: Copyright of this article belongs to Elsevier.
Uncontrolled Keywords: Atmospheric thermodynamics, Back trajectory analysis; Cape rama; FLEXPART; Ground-based monitoring; Indian subcontinents; Indo-Gangetic Plains; Planetary boundary layers; Sinhagad, Carbon dioxide, carbon dioxide, air mass; atmospheric pollution; atmospheric transport; boundary layer; carbon dioxide; monitoring; monsoon; seasonal variation; spatial variation, air monitoring; air sampling; article; atmospheric transport; carbon dioxide transport; carbon footprint; India; marine environment; priority journal; seasonal variation; sensitivity analysis; summer; winter, Arabian Sea; Gangetic Plain; India; Indian Ocean; Western Ghats
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 11 Dec 2014 09:51
Last Modified: 11 Dec 2014 09:51

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