Cloud Condensation Nuclei concentrations in the Amazon Basin
Göran
Frank, Max Planck Institute for Chemistry, Mainz, Germany, gfrank@mpch-mainz.mpg.de
Greg
Roberts, Centre for Atmospheric Sciences, Scripps Inst. of Oceanography, La Jolla, California, USA, greg@fiji.ucsd.edu
Erik
Swietlicki, Dept. of Physics, Lund University, Sweden, erik.swietlicki@pixe.lth.se
Paulo
Artaxo, Dept. of Physics, University of Sao Paulo, Sao Paulo, Brazil, artaxo@if.usp.br
Luciana
Varanda
Rizzo, Dept. of Physics, University of Sao Paulo, Sao Paulo, Brazil, lrizzo@if.usp.br
Pascal
Guyon, Max Planck Institute for Chemistry, Mainz, Germany, guyon@mpch-mainz.mpg.de
Olga
L.
Mayol-Bracero, Institute for Tropical Ecosystem Studies, University of Puerto Rico, San Juan, Puerto Rico, omayol@sunites.upr.clu.edu
Anders
Erik
Vestin, Dept. of Physics, Lund University, Sweden, anders.vestin@nuclear.lu.se
Jenny
Rissler, Dept. of Physics, Lund University, Sweden, jenny.rissler@pixe.lth.se
Jingchuan
Zhou, Dept. of Physics, Lund University, Sweden, jingchuan.zhou@pixe.lth.se
Meinrat
O.
Andreae, Max Planck Institute for Chemistry, Mainz, Germany, andreae@mpch-mainz.mpg.de
(Presenting)
Cloud Condensation Nuclei (CCN) concentrations have been measured in the Amazon Basin during the LBA/CLAIRE-1998, LBA/EUSTACH-1999, LBA/CLAIRE-2001 and LBA/SMOCC-2002 projects. Measurements were made at several locations, both at ground-based stations and in aircraft measurements, ranging from background environments to highly polluted biomass burning smoke environments, during different seasons. The CCN measurements in the LBA/CLAIRE-1998 campaign took place during the wet season (March-April 1998) at a ground-based station in the Manaus region. The measurements during the LBA/EUSTACH-1999 took place during two measurement periods, both times at two different locations in the state of Rondonia. The first measurement period was during the transition from the wet-to-dry season, and the second during the transition from the dry-to-wet season. The measurements in the LBA/CLAIRE-2001 campaign took place in the Manaus region July 2001, mainly from an aircraft but also at a ground-based station. Finally, the LBA/SMOCC campaign took place September to November 2002 at a ground-based station in Rondonia, as well as in aircraft measurements over the states of Rondonia, Mato Grosso, Acre and the west of Amazonas.
The results show large variations in CCN concentrations from a few hundred CCN per cm3 in the natural background areas to several thousands of CCN per cm3 in the hazy smoke layer in biomass burning areas. Also CCN efficiency, expressed as ratios between CCN concentrations and total aerosol particle concentrations, shows large variations. This can to a large extent be explained by varying aerosol size distributions.