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Tropospheric NO2 variability over the metropolitan cities and hill stations of India

Meena, GS and Patil, SD and Manoj, MG and Devara, PCS (2013) Tropospheric NO2 variability over the metropolitan cities and hill stations of India. Natural Hazards, 65 (1). pp. 723-737.

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Monthly and inter-annual variation in tropospheric nitrogen dioxide (NO2) have been examined over metropolitan cities (New Delhi, Kolkata, Mumbai and Chennai) and hill stations (Mount Abu, Nainital, Srinagar, Kodaikanal, Dalhousie, Gulmarg, Shimla and Munnar) of India during the period 2004-2010 using satellite-based SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY). It is observed that the monthly variation in NO2 over the metropolitan cities is higher during winter (November-December-January-February) months and lower during summer monsoon (June-July-August-September) months. Lower NO2 in summer monsoon leads to the presence of deep convection and higher in winter leads to calm winds and more residential time of gases. Moreover, rapid industrialization and traffic growth are also responsible for the higher NO2. Mean values of NO2 over New Delhi and Mumbai as well as hill stations, such as Mount Abu, Nainital and Shimla, have exhibited more pollution. Similarly, maximum NO2 occurred over the hill stations during pre-monsoon months (April-May) and early part of summer monsoon (June). Higher NO2 values are observed in November-December months. All the hill stations also show increasing trend of NO2 during the period 2004-2010. Increasing pollution of NO2 over the hill stations might also be due to forest fires, biomass burning and long-range transport. Back trajectory analysis shows that the observed peaks in NO2 are a resultant of the long-range transported component amplified by the local environment. In the northern hill stations, pollution seems transported from west Asian and European countries while in the southern hill stations, pollution is originated from southern Indian Ocean and East Asian countries.

Item Type: Article
Additional Information: Copyright of this article belongs to Springer
Uncontrolled Keywords: annual variation; atmospheric convection; atmospheric pollution; biomass burning; forest fire; industrial emission; long range transport; metropolitan area; nitrogen dioxide; satellite imagery; SCIAMACHY; traffic emission; troposphere, India
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 10 Jun 2014 09:16
Last Modified: 10 Jun 2014 09:16

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