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Title: Regional variability of rain clouds in the amazon basin as seen by a network of weather radars
Authors: Saraiva, Ivan
Silva-Dias, Maria Assunção F.
Morales Rodriguez, Carlos Augusto
Saraiva, Jaci Maria Bilhalva
Keywords: Lightning
Meteorological Radar
Quality Control
Data Quality Control
Diurnal Effects
Intraseasonal Variability
Protection Systems
Radar Reflectivities
Radars/radar Observations
Regional Variability
Vertical Distributions
Convective System
Data Quality
Precipitation Intensity
Quality Control
Temporal Variation
Amazon Basin
Issue Date: 2016
metadata.dc.publisher.journal: Journal of Applied Meteorology and Climatology
metadata.dc.relation.ispartof: Volume 55, Número 12, Pags. 2657-2675
Abstract: A new dataset based on 5 yr of operational meteorological weather radars from the Amazon Protection System has enabled new knowledge in relation to rainfall in the Amazon basin. The rainy features are analyzed for 10 different regions in terms of the annual and diurnal cycles of radar reflectivity, as well as the vertical distribution, in addition to lightning data. Similarities between the annual and diurnal cycles are found in the northwestern and western, southwestern and southern, and northeastern and northern Amazon. Nocturnal peaks are found in stratiform fraction in the southern, southwestern, western, northwestern, northern, central western, and coastal regions. The convective fractions in the western, northwestern, northern, and central eastern regions also show nocturnal peaks. The radar reflectivity vertical distributions analysis indicates that in the northern coast close to Belém, heavy rainfall with deep convective systems is observed throughout the year, while heavy rainfall in the central Amazon close to Manaus, Tefé, and Santarém occurs in the dry season. More oceanic-like clouds are also observed there and in other locations on the northern coast like Macapá, where the frequency of lightning is quite low. São Gabriel da Cachoeira, located in the northwest portion of the Amazon basin, has a regime with rainfall in all seasons with a slight decrease from August to October when the systems become more convective and have more lightning. © 2016 American Meteorological Society.
metadata.dc.identifier.doi: 10.1175/JAMC-D-15-0183.1
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