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摘要
Airborne measurements of the number concentration and size distribution of aerosols from 13 to 700 urn diameter have been made at four vertical levels across a, coastline at Bhubaneswar (20 degrees 25'N, 85 degrees 83'E) during the Integrated Campaign for Aerosols, gases and Radiation Budget (ICARB) programme conducted in March-April 2006. The measurements made during the constant-level flights at 0.5, 11 2 and 3 km altitude levels extend - 100 km over land and - 150 kin over ocean. Aerosol umber concentrations vary from 2200 to 4500 cm(-3) at 0.5 km level but are almost constant at - 6000 cm-(3) and 800 cm(-3) at 2 and 3 km levels, respectively. At 1 km level. aerosol number concentration shows a peak of 18,070 Cm(-3) around the coastline. Most of the aerosol size distribution curves at 0.5 km and I kin levels are monomodal with a maxima, at 110 nm diameter which shifts to 70 Din diameter at 2 and 3 km levels. However, at the peak at I kin level, number concentration has a, bimodal distribution with an additional maximum appearing in nucleation mode. It is proposed that, this maxima, in nucleation mode at 1 km level mm, be due to the formation and transport of new particles from coastal regions.
- 出版日期2008-7
