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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.)

An analysis of diurnal cycles in the mass of ambient aerosols derived from biomass burning and agro-industry

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Author(s):
Caetano-Silva, L. [1] ; Allen, A. G. [1] ; Lima-Souza, M. [1] ; Cardoso, A. A. [1] ; Campos, M. L. A. M. [2] ; Nogueira, R. F. P. [1]
Total Authors: 6
Affiliation:
[1] Univ Estadual Paulista, Inst Quim, Araraquara - Brazil
[2] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Dept Quim, Ribeirao Preto - Brazil
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES; v. 118, n. 15, p. 8675-8687, AUG 16 2013.
Web of Science Citations: 10
Abstract

Strong diurnal cycles in ambient aerosol mass were observed in a rural region of Southeast Brazil where the trace composition of the lower troposphere is governed mainly by emissions from agro-industry. An optical particle counter was used to record size-segregated aerosol number concentrations between 13 May 2010 and 15 March 2011. The data were collected every 10min and used to calculate aerosol mass concentrations. Aerosol samples were also collected onto filters during daytime (10:00-16:00 local time) and nighttime (20:00-06:00) periods, for subsequent analysis of soluble ions and water-soluble organic carbon. Biomass burning aerosols predominated during the dry winter, while secondary aerosols were most important in the summer rainy season. In both seasons, diurnal cycles in calculated aerosol mass concentrations were due to the uptake of water by the aerosols and, to a lesser extent, to emissions and secondary aerosol formation. In neither season could the observed mass changes be explained by changes in the depth of the boundary layer. In the summer, nighttime increases in aerosol mass ranged from 2.7-fold to 81-fold, depending on particle size, while in the winter, the range was narrower, from 2.2-fold to 9.5-fold, supporting the possibility that the presence of particles derived from biomass burning reduced the overall ability of the aerosols to absorb water. (AU)

FAPESP's process: 08/58073-5 - Effects of emissions on current and future rainfall patterns in southeast Brazil
Grantee:Arnaldo Alves Cardoso
Support Opportunities: Research Program on Global Climate Change - Thematic Grants