Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2807r&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 14, p. 2807-2810
Physics
39
Atmospheric Composition And Structure, Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions, Atmospheric Composition And Structure: Cloud Physics And Chemistry
Scientific paper
Cloud condensation nuclei (CCN) are linked to radiative forcing, precipitation, and cloud structure; yet, their role in tropical climates remains largely unknown. CCN concentrations (NCCN) measured during the wet season in the Amazon Basin were surprisingly low (mean NCCN at 1% supersaturation: 267+/-132cm-3) and resembled concentrations more typical of marine locations than most continental sites. At low background CCN concentrations, cloud properties are more sensitive to an increase in NCCN. Therefore, enhanced aerosol emissions due to human activity in the Amazon Basin may have a stronger impact on climate than emissions in other continental regions. In spite of the large organic fraction in the Amazonian aerosol, a detailed analysis of number distributions and size-dependent chemical composition indicates that sulfate plays an important role in CCN activity.
Andreae Meinrat O.
Artaxo Paulo
Roberts Gregory C.
Zhou Jingchuan
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