@Article{RibaudMachBisc:2019: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",
year = "2019",
volume = "12",
number = "2",
pages = "811--837",
month = "Feb.",
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 Z(H), differential reflectivity Z(DR),
specific differential-phase K-DP, and correlation coefficient rho
HV) and temperature data inferred from sounding balloons. The
sensitivity of the agglomerative clustering scheme for measuring
the intercluster 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, graupel, aggregates, and ice
crystals. The main discrepancy between the wet and dry seasons is
the presence of both low-and high-density graupel 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 midlatitudes.",
doi = "10.5194/amt-12-811-2019",
url = "http://dx.doi.org/10.5194/amt-12-811-2019",
issn = "1867-1381",
language = "en",
targetfile = "ribaud_xband.pdf",
urlaccessdate = "27 abr. 2024"
}