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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A long-term study of aerosol-cloud interactions and their radiative effect at the Southern Great Plains using ground-based measurements

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Author(s):
Sena, Elisa T. ; McComiskey, Allison ; Feingold, Graham
Total Authors: 3
Document type: Journal article
Source: Atmospheric Chemistry and Physics; v. 16, n. 17, p. 11301-11318, SEP 13 2016.
Web of Science Citations: 5
Abstract

Empirical estimates of the microphysical response of cloud droplet size distribution to aerosol perturbations are commonly used to constrain aerosol-cloud interactions in climate models. Instead of empirical microphysical estimates, here macroscopic variables are analyzed to address the influence of aerosol particles and meteorological descriptors on instantaneous cloud albedo and the radiative effect of shallow liquid water clouds. Long-term ground-based measurements from the Atmospheric Radiation Measurement (ARM) program over the Southern Great Plains are used. A broad statistical analysis was performed on 14 years of coincident measurements of low clouds, aerosol, and meteorological properties. Two cases representing conflicting results regarding the relationship between the aerosol and the cloud radiative effect were selected and studied in greater detail. Microphysical estimates are shown to be very uncertain and to depend strongly on the methodology, retrieval technique and averaging scale. For this continental site, the results indicate that the influence of the aerosol on the shallow cloud radiative effect and albedo is weak and that macroscopic cloud properties and dynamics play a much larger role in determining the instantaneous cloud radiative effect compared to microphysical effects. On a daily basis, aerosol shows no correlation with cloud radiative properties (correlation = -0.01 +/- 0.03), whereas the liquid water path shows a clear signal (correlation = 0.56 +/- 0.02). (AU)

FAPESP's process: 14/04181-2 - Long-term study of aerosol-cloud interactions and their impact on climate using ground-based remote sensing in the Central Amazonia
Grantee:Elisa Thome Sena
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 13/08582-9 - The impacts of urban emissions from Manaus and of the deforestation on the radiative balance in the Amazonia
Grantee:Elisa Thome Sena
Support Opportunities: Scholarships in Brazil - Post-Doctoral