@Article{CecchiniMachArta:2014:DrSiDi,
author = "Cecchini, Micael Amore and Machado, Luiz Augusto Toledo and
Artaxo, P.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and Instituto de
F{\'{\i}}sica (IF), Universidade de S{\~a}o Paulo (USP)",
title = "Droplet Size Distributions as a function of rainy system type and
Cloud Condensation Nuclei concentrations",
journal = "Atmospheric Research",
year = "2014",
volume = "143",
pages = "301--312",
keywords = "Cluster analysis, Condensation, Drops, Method of moments, Size
distribution, Atmospheric properties, Classification system, Cloud
condensation nuclei, Cloud microphysics, Cloud resolving model,
Droplet size distributions, Particle concentrations, Precipitation
systems, Rain, aerosol, cloud condensation nucleus, cloud
microphysics, precipitation (climatology), raindrop, size
distribution, Brazil.",
abstract = "This work aims to study typical Droplet Size Distributions (DSDs)
for different types of precipitation systems and Cloud
Condensation Nuclei concentrations over the Vale do
Para{\'{\i}}ba region in southeastern Brazil. Numerous
instruments were deployed during the CHUVA (Cloud processes of tHe
main precipitation systems in Brazil: a contribUtion to cloud
resolVing modeling and to the GPM) Project in Vale do
Para{\'{\i}}ba campaign, from November 22, 2011 through January
10, 2012. Measurements of CCN (Cloud Condensation Nuclei) and
total particle concentrations, along with measurements of rain
DSDs and standard atmospheric properties, including temperature,
pressure and wind intensity and direction, were specifically made
in this study. The measured DSDs were parameterized with a gamma
function using the moment method. The three gamma parameters were
disposed in a 3-dimensional space, and subclasses were classified
using cluster analysis. Seven DSD categories were chosen to
represent the different types of DSDs. The DSD classes were useful
in characterizing precipitation events both individually and as a
group of systems with similar properties. The rainfall regime
classification system was employed to categorize rainy events as
local convective rainfall, organized convection rainfall and
stratiform rainfall. Furthermore, the frequencies of the seven DSD
classes were associated to each type of rainy event. The rainfall
categories were also employed to evaluate the impact of the CCN
concentration on the DSDs. In the stratiform rain events, the
polluted cases had a statistically significant increase in the
total rain droplet concentrations (TDCs) compared to cleaner
events. An average concentration increase from 668cm-3 to 2012cm-3
for CCN at 1% supersaturation was found to be associated with an
increase of approximately 87m-3 in TDC for those events. For the
local convection cases, polluted events presented a 10% higher
mass weighted mean diameter (Dm) on average. For the organized
convection events, no significant results were found. © 2014
Elsevier B.V.",
doi = "10.1016/j.atmosres.2014.02.022",
url = "http://dx.doi.org/10.1016/j.atmosres.2014.02.022",
issn = "0169-8095",
label = "scopus 2014-05 CecchiniMachArta:2014:DrSiDi",
language = "en",
urlaccessdate = "27 abr. 2024"
}