@Article{RibaudMachBisc:2018:XbDuRa,
author = "Ribaud, Jean-Fran{\c{c}}ois and Machado, Luiz Augusto Toledo and
Biscaro, Thiago Souza",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)}",
title = "X-band dual-polarization radar-based hydrometeor classification
for Brazilian tropical precipitation systems",
journal = "Atmospheric Measurement Techniques Discussions",
year = "2018",
volume = "2018",
number = "174",
keywords = "hydrometeor identification, tropical microphysics,
dual-polarization radar, clustering.",
abstract = "The dominant hydrometeor types associated with Brazilian tropical
precipitation systems are identified via research X-band
dual-polarization radar deployed in the vicinity of the Manaus
region (Amazonas) during both the GoAmazon2014/5 and
ACRIDICON-CHUVA field experiments. The present study is based on
an Agglomerative Hierarchical Clustering (AHC) approach that makes
use of dual polarimetric radar observables (reflectivity at
horizontal polarization ZH, differential reflectivity ZDR,
specific differential phase KDP, and correlation coefficient
\ρHV) and temperature data inferred from sounding balloons.
The sensitivity of the agglomerative clustering scheme for
measuring the inter-cluster dissimilarities (linkage criterion) is
evaluated through the wet season dataset. Both the weighted and
Ward linkages exhibit better abilities to retrieve cloud
microphysical species, whereas clustering outputs associated with
the centroid linkage are poorly defined. The AHC method is then
applied to investigate the microphysical structure of both the wet
and dry seasons. The stratiform regions are composed of five
hydrometeor classes: drizzle, rain, wet snow, aggregates, and ice
crystals, whereas convective echoes are generally associated with
light rain, moderate rain, heavy rain, graupels, aggregates and
ice crystals. The main discrepancy between the wet and dry seasons
is the presence of both low- and highdensity graupels within
convective regions, whereas the rainy period exhibits only one
type of graupel. Finally, aggregate and ice crystal hydrometeors
in the tropics are found to exhibit higher polarimetric values
compared to those at mid-latitudes.",
doi = "10.5194/amt-2018-174",
url = "http://dx.doi.org/10.5194/amt-2018-174",
issn = "1867-8610",
language = "en",
targetfile = "X-band_dual-polarization_radar-based_hydrometeor_c.pdf",
urlaccessdate = "27 abr. 2024"
}