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| Titel |
Distribution of ozone and its precursors over Bay of Bengal during winter 2009: role of meteorology |
| VerfasserIn |
L. M. David, I. A. Girach, P. R. Nair |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 29, no. 9 ; Nr. 29, no. 9 (2011-09-20), S.1613-1627 |
| Datensatznummer |
250017091
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| Publikation (Nr.) |
 copernicus.org/angeo-29-1613-2011.pdf |
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| Zusammenfassung |
| Measurements of ozone and NO2 were carried out in the marine
environment of the Bay of Bengal (BoB) during the winter months, December
2008–January 2009, as part of the second Integrated Campaign for Aerosols,
gases and Radiation Budget conducted under the Geosphere Biosphere Programme
of the Indian Space Research Organization. The ozone mixing ratio was found
to be high in the head and the southeast BoB with a mean value of 61 ± 7 ppb
and 53 ± 6 ppb, respectively. The mixing ratios of NO2 and
CO were also relatively high in these regions. The spatial patterns were
examined in the light of airflow patterns, air mass back trajectories and
other meteorological conditions and satellite retrieved maps of tropospheric
ozone, NO2, CO, and fire count in and around the region. The
distribution of these gases was strongly associated with the transport from
the adjoining land mass. The anthropogenic activities and forest
fires/biomass burning over the Indo Gangetic Plains and other East Asian
regions contribute to ozone and its precursors over the BoB. Similarity in
the spatial pattern suggests that their source regions could be more or less
the same. Most of the diurnal patterns showed decrease of the ozone mixing
ratio during noon/afternoon followed by a nighttime increase and a morning
high. Over this oceanic region, photochemical production of ozone involving
NO2 was not very active. Water vapour played a major role in
controlling the variation of ozone. An attempt is
made to simulate ozone level over the north and south BoB using the
photochemical box model (NCAR-MM). The present observed features were
compared with those measured during the earlier cruises conducted in
different seasons. |
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