| タイトル | Global Distribution and Sources of Volatile and Nonvolatile Aerosol In the Remote Troposphere |
| 著者（英） | Viezee, W.; Pueschel, R.; Hipskind, R. Stephen; Che, Y.; Hannan, J. R.; Tabazadeh, A.; Hamill, P.; Singh, Hanwant B.; Anderson, B.; Avery, M.; Fuelberg, H. E. |
| 著者所属（英） | NASA Ames Research Center |
| 発行日 | 2001-01-01 |
| 言語 | eng |
| 内容記述 | Airborne measurements of aerosol (Condensation Nuclei, CN) and selected trace gases made in the areas of the North Atlantic Ocean during SONEX (October/November 1997), and the south tropical Pacific Ocean during PEM-Tropics A (September/October 1996) and PEM-Tropics B (March/April 1999) have been analyzed. Emphasis is on the interpretations of variations in the number densities of the fine (>17 nm) and ultrafine (>8 nm) CN in the upper troposphere (8-12 km). These data suggest that large number densities of highly volatile CN (10(exp 4)-10(exp 5)/cu cm) are present in the clean upper troposphere with highest values over the tropical1subtropical region. Through marine convection and long-distance horizontal transport, volatile CN originating from the tropical/subtropical regions can frequently impact the abundance of aerosol in the middle and upper troposphere at mid to high latitudes. Nonvolatile aerosol particles behave in a manner similar to tracers of combustion (CO) and photochemical pollution (PAN), implying a source from continental pollution of industrial or biomass burning origin. In the upper troposphere, we find that volatile and nonvolatile partials number densities are inversely correlated. An aerosol microphysical model is used to suggest that coagulation of fine volatile particles with fewer larger nonvolatile particles provides one possible mechanism for this relationship. It appears that nonvolatile particles, of principally anthropogenic origin,provide a highly efficient removal process for the fine volatile aerosol. |
| NASA分類 | Environment Pollution |
| 権利 | No Copyright |
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