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Abstract

Aerosol measurements were made on board the RV Polarstern during its transect from Bremerhaven, Germany to Punta Arenas, Chile. Continous size distribution measurements down to particle diameter 3.5 nm indicate that nucleation is not occurring in boundary layer air masses, with two notable exceptions occurring in subsiding air masses or in Föhn conditions respectively. The lack of nucleation in the marine boundary layer (MBL) is associated with high levels of accumulation mode aerosol and the presence of anthropogenic tracers. Air mass trajectory analysis however shows that the corresponding air masses have been near the ocean surface for at least 10 days, which suggests that these tracers are fed into the MBL by entrainment from the overlying free troposphere, in which they can be transported over long distances.

Additional information

Authors: VAN DINGENEN R, JRC Ispra (IT);MANGONI M, JRC Ispra (IT);PUTAUD J-P, JRC Ispra (IT);WÄTJEN U, JRC Geel (BE)
Bibliographic Reference: Paper presented: 14th International Conference of Atmospheric and Aerosol and Nucleation, University of Helsinki (FI), August 20-30, 1996
Availability: Available from (1) as Paper EN 39992 ORA
Record Number: 199610981 / Last updated on: 1996-09-30
Category: PUBLICATION
Original language: en
Available languages: en