Observations of trace gases and aerosols over the Indian Ocean during the monsoon transition period |
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| Authors: | T K Manual Ateef Khan Y Nazeer Ahammed R S Tanwar R S Parmar K S Zalpuri Prabhat K Gupta S L Jain Risal Singh A P Mitra S C Garg A Suryanarayana V S N Murty M Dileep Kumar Andrew J Shepherd |
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| Affiliation: | (1) National Physical Laboratory, 110 012 New Delhi, India;(2) National Institute of Oceanography, Dona Paula, 403 004 Goa, India;(3) National Ocean and Atmospheric Administration/Pacific Marine Environmental Laboratory, USA |
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| Abstract: | Characteristics of trace gases (O3, CO, CO2, CH4 and N2O) and aerosols (particle size of 2.5 micron) were studied over the Arabian Sea, equatorial Indian Ocean and southwest part
of the Bay of Bengal during the monsoon transition period (October–November, 2004). Flow of pollutants is expected from south
and southeast Asia during the monsoonal transition period due to the patterns of wind flow which are different from the monsoon
period. This is the first detailed report on aerosols and trace gases during the sampled period as the earlier Bay of Bengal
Experiment (BOBMEX), Arabian Sea Monsoon Experiment (ARMEX) and Indian Ocean Experiments (INDOEX) were during monsoon seasons.
The significant observations during the transition period include: (i) low ozone concentration of the order of 5 ppbv around
the equator, (ii) high concentrations of CO2, CH4 and N2O and (iii) variations in PM2.5 of 5–20μg/m3. |
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| Keywords: | Trace gases aerosols Indian Ocean monsoon transition air pollutants |
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