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Unusual diurnal variation in surface ozone observed after the 26 December 2004 tsunami over the rural site of Bay of Bengal, India

Debaje, S and Johnson Jeyakumar, S and Rajendran, M (2011) Unusual diurnal variation in surface ozone observed after the 26 December 2004 tsunami over the rural site of Bay of Bengal, India. International Journal of Remote Sensing, 32 (4). pp. 951-971.

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Measurements of surface ozone (O 3) and nitrogen dioxide (NO 2) were studied from December 2004 to February 2005, covering the giant tsunami event on 26 December 2004 at Tranquebar (11° N, 79.9° E, 9 m) over the west coast of the Bay of Bengal, India. An unusual maximum O 3 concentration of 28 parts per billion by volume (ppbv) was observed in the morning and a minimum (16 ppbv) in the evening, indicating that pronounced chemical loss of O 3 occurred in the daytime after the tsunami over this coastal region. An increase in NO 2 concentration from 5.6 ppbv before the tsunami to 10.5 ppbv after the tsunami was observed in the daytime. The observed unusual diurnal changes in O 3 were not due to mass transport processes as the five-day back trajectories of air parcels transport before and after the tsunami remained unchanged. Similarly, meteorological and micrometeorological parameters were found to be normal before and after the tsunami. The unusual low O 3 level during the daytime was possibly due to prolonged excess emission of iodocarbons from the sea surface after the tsunami, which resulted in enhanced inorganic iodine (I x) concentration, leading tomassive destruction of O 3. Similarly, unusually high O 3 levels during the night-time were possibly due to the intrusion of ozone-rich air after the tsunami from the free troposphere into the surface layer when the boundary layer height shrinks after midnight. The present work can be extended on a regional scale by incorporating modelling studies using recent remote sensing tools.

Item Type: Article
Additional Information: Copyright of this article belongs to Taylor & Francis.
Uncontrolled Keywords: Air parcels; Back trajectories; Bay of Bengal , India; Before and after; Boundary layer heights; Chemical loss; Coastal regions; Diurnal changes; Diurnal variation; Free troposphere; Inorganic iodine; Mass-transport process; Modelling studies; Nitrogen dioxides; Ozone-rich air; Parts per billion; Regional scale; Remote sensing tools; Rural site; Sea surfaces; Surface layers; Surface ozone; West coast, Atmospheric movements; Coastal zones; Iodine; Nitrogen oxides; Ozone; Ozone layer; Remote sensing, Tsunamis, boundary layer; concentration (composition); diurnal variation; Indian Ocean tsunami 2004; nitrogen dioxide; numerical model; ozone; remote sensing; troposphere, Bay of Bengal; India; Indian Ocean
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 29 Oct 2014 10:09
Last Modified: 29 Oct 2014 10:09

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