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    • Keywords


      Trace gases; aerosols; Indian Ocean; monsoon transition; air pollutants

    • 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.

    • Author Affiliations


      T K Manual1 Ateef Khan1 Y Nazeer Ahammed1 R S Tanwar1 R S Parmar1 K S Zalpuri1 Prabhat K Gupta1 S L Jain1 Risal Singh1 A P Mitra1 S C Garg1 A Suryanarayana2 V S N Murty2 M Dileep Kumar2 Andrew J Shepherd3

      1. National Physical Laboratory, New Delhi - 110 012, India
      2. National Institute of Oceanography, Dona Paula, Goa - 403 004, India
      3. National Ocean and Atmospheric Administration/Pacific Marine Environmental Laboratory, USA
    • Dates

  • Journal of Earth System Science | News

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