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Title: An overview of the Amazonian Aerosol Characterization Experiment 2008 (AMAZE-08)
Authors: Martin, Scot T.
Andreae, Meinrat O.
Althausen, Dietrich
Artaxo, Paulo
Baars, Holger
Borrmann, Stephan H.
Chen, Qi
Farmer, Delphine K.
Guenther, Alex B.
Gunthe, Sachin S.
Ji?enez, José Luis
Karl, Thomas G.
Longo, Karla Maria
Manzi, Antônio Ocimar
Müller, Thomas
Pauliquevis, Theotônio M.
Petters, Markus Dirk
Prenni, Anthony J.
Pöschl, Ulrich
Rizzo, L. V.
Schneider, Johannes
Smith, James N.
Swietlicki, Erik
Tóta, Júlio
Wang, Jun
Wiedensohler, Alfred
Zorn, Soeren R.
Keywords: Aerosol Composition
Aerosol Formation
Formation Mechanism
Numerical Model
Particle Size
Size Distribution
Temporal Variation
Amazon Basin
Issue Date: 2010
metadata.dc.publisher.journal: Atmospheric Chemistry and Physics
metadata.dc.relation.ispartof: Volume 10, Número 23, Pags. 11415-11438
Abstract: The Amazon Basin provides an excellent environment for studying the sources, transformations, and properties of natural aerosol particles and the resulting links between biological processes and climate. With this framework in mind, the Amazonian Aerosol Characterization Experiment (AMAZE-08), carried out from 7 February to 14 March 2008 during the wet season in the central Amazon Basin, sought to understand the formation, transformations, and cloud-forming properties of fine- and coarse-mode biogenic aerosol particles, especially as related to their effects on cloud activation and regional climate. Special foci included (1) the production mechanisms of secondary organic components at a pristine continental site, including the factors regulating their temporal variability, and (2) predicting and understanding the cloud-forming properties of biogenic particles at such a site. In this overview paper, the field site and the instrumentation employed during the campaign are introduced. Observations and findings are reported, including the large-scale context for the campaign, especially as provided by satellite observations. New findings presented include: (i) a particle number-diameter distribution from 10 nm to 10 Î1/4m that is representative of the pristine tropical rain forest and recommended for model use; (ii) the absence of substantial quantities of primary biological particles in the submicron mode as evidenced by mass spectral characterization; (iii) the large-scale production of secondary organic material; (iv) insights into the chemical and physical properties of the particles as revealed by thermodenuder-induced changes in the particle number-diameter distributions and mass spectra; and (v) comparisons of ground-based predictions and satellite-based observations of hydrometeor phase in clouds. A main finding of AMAZE-08 is the dominance of secondary organic material as particle components. The results presented here provide mechanistic insight and quantitative parameters that can serve to increase the accuracy of models of the formation, transformations, and cloud-forming properties of biogenic natural aerosol particles, especially as related to their effects on cloud activation and regional climate. © 2010 Author(s).
metadata.dc.identifier.doi: 10.5194/acp-10-11415-2010
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