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High ozone at coastal sites in India

Debaje, S and Jeyakumar, SJ (2011) High ozone at coastal sites in India. International Journal of Remote Sensing, 32 (4). pp. 993-1015.

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We present the field measurements of surface ozone (O 3) made across the coast in five locations at three stations Poombuhar (11.14° N, 79.9° E), Tranquebar (11° N, 79.9° E) and TR Pattinam (10.46° N, 79.9° E) along the west coast of the Bay of Bengal, India in December 2000 and 2002 and in April 2001 and 2003. Measurements show a higher concentration of surface O 3 up to 4.0-6.9 parts per billion by volume (ppbv) at the coastline as compared to the concentration of surface O 3 at a distance 20 km inland. The higher coastline O 3 concentration is attributed to the short-lived chlorine species with a lifetime of less than 10 minutes generated from the chemical reaction of sea salt particles. Mean O 3 concentration decreases inland with distance from the coastline. Furthermore, the greatest difference between the coastline surface O 3 concentration and O 3 concentration 20 km inland was 4.8-6.4 ppbv, observed at 10 h in the morning, which is related to the morning peak of chlorine molecule (Cl 2) concentration. Measurements of nitrogen dioxide (NO 2) show concentrations between 4 and 10 ppbv, which are substantially higher than the critical limit of surface O 3 production.

Item Type: Article
Additional Information: Copyright of this article belongs to Taylor and Francis.
Uncontrolled Keywords: Bay of Bengal , India; Coastal sites; Critical limit; Field measurement; Nitrogen dioxides; Parts per billion; Sea salt particles; Surface ozone; West coast, Chlorine; Landforms; Nitrogen oxides; Ozone, Concentration (process), chlorine; coastal zone; concentration (composition); nitrogen dioxide; ozone; remote sensing, Bay of Bengal; India; Indian Ocean
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 19 Jul 2014 07:16
Last Modified: 19 Jul 2014 07:16

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