Study of optical properties and spatial distribution of cirrus clouds over São Paulo, Brazil, using CALIPSO level 2 data
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2021
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WORKSHOP ON LIDAR MEASUREMENTS IN LATIN AMERICA, 11th
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Cirrus clouds have an important role in the earth’s radiation budget, they have a wide spatial
extension and are the most present type of clouds in the atmosphere, especially in tropical regions (Sassen et al.,
2018). Due their thickness, Cirrus clouds are almost transparent for the incoming shortwave solar radiation and
opaque to the longwave emitted by the planet's surface. Despite the importance of Cirrus clouds in the earth’s
climate, there is a lack of studies focused on this type of cloud in the southern hemisphere. Since 2006, the
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO), a joint mission between NASA
and the French space agency, CNES, provides physical and optical information of clouds and aerosols to
improve the understanding of their role in the climate, air quality and radiation budget in the Earth. The primary
instrument of CALIPSO payload is the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP), which is
a lidar system operating on 1064 nm and 532 nm (with parallel and perpendicular polarization) wavelengths.
CALIOP provides as level 1 data, high-resolution vertical profiles of aerosols and clouds. In turn, the level 2
data provides processed products such as cloud-aersol discrimination, cloud base and top layer altitude, and
cloud optical depth. The aim of this work is use the CALIOP global coverage to study the physical and optical
properties of Cirrus clouds over the São Paulo State (roughly centered on 21.3°S, 50.3°W), in Brazil. We have
employed a statistic analysis of 9 years (2007-2015) of data using the level 2 products to obtain spatial
distribution and optical properties of cirrus clouds over São Paulo state, in order to understanding the long-term
trend of Cirrus clouds coverage in the São Paulo state and later on Brazil.
Como referenciar
SOUZA, GIOVANNI; LOPES, FABIO J.S.; LANDULFO, EDUARDO. Study of optical properties and spatial distribution of cirrus clouds over São Paulo, Brazil, using CALIPSO level 2 data. In: WORKSHOP ON LIDAR MEASUREMENTS IN LATIN AMERICA, 11th, October 19-22, 2021, Punta Arenas, Chile. Abstract... Punta Arenas, Chile: Universidad de Magallanes, 2021. p. 67-67. Disponível em: http://repositorio.ipen.br/handle/123456789/33313. Acesso em: 29 Apr 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.