| Popis: |
It is necessary to assess the spatial distribution and variation of optical properties and chemical species of atmospheric aerosols to estimate the direct effect on climate. In the western Pacific Ocean, where the pollutants are transported from the East Asia, there are little aerosol measurements available to estimate the climate effect. In this study the aerosol optical and chemical properties were measured in June-July 2000 in the western Pacific Ocean on board the research vessel Mirai. In the southern area of 30° N, it was found that the area was under marine background condition due to less concentration of anthropogenic elements of aerosols such as V, Ni and Pb than those in the area north of 30° N. In south of 30° N, absorption coefficient (σap) were extremely low as those less than 2× 10-7m-1, and scattering coefficients (σap) ranged from 80× 10-7m-1 to 212× 10-7m-1. The single scattering albedo (ω), then, ranged from 0.97 to 0.99, which shows the aerosols were highly transparent in summer in the western Pacific Ocean. |
