Diversity on subtropical and polar properties as derived from both ground-based lidars and CALIPSO/CALIOP measurements
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Cirrus (Ci) cloud properties can change significantly from place to place over the globe as a result ofweather processes,
reflecting their likely different radiative and climate implications. In this work Cirrus clouds (Ci) features
observed in late autumn/earlywinter season at both subtropical and polar latitudes are examined and compared
to CALIPSO/CALIOP observations. Lidar measurementswere carried out in three stations: São Paulo (MSP, Brazil)
and Tenerife (SCO, Canary Islands, Spain), as subtropical sites, and the polar Belgrano II base (BEL, Argentina) in
the Antarctic continent. The backscattering ratio (BSR) profiles and the top and base heights of the Ci layers together
to their Cirrus Cloud Optical Depth (CCOD) and Lidar Ratio (LR) for Ci clouds were derived. In addition,
temperatures at the top and base boundaries of the Ci clouds were also obtained from local radiosoundings to
verify pure ice Ci clouds occurrence using a given temperature top threshold (b−38 °C). Ci clouds observed
along the day were assembled in groups based on their predominant CCOD, and classified according to four
CCOD-based categories. Ci clouds were found to be vertically-distributed in relation with the temperature,
forming subvisual Ci clouds at lower temperatures and higher altitudes than other Ci categories at both latitudes.
Discrepancies shown on LR values for the three stations, but mainly remarked between subtropical and polar
cases, can be associated to different temperature regimes for Ci formation, influencing the internal ice habits of
the Ci clouds, and hence likely affecting the LR derived for the Ci layer. In comparison with literature values,
daily mean CCOD/LR for SCO (0.4 ± 0.4/21 ± 10 sr), MSP (0.5 ± 0.5/27 ± 5 sr) and BEL (0.2 ± 0.3/28 ± 9 sr)
are in good agreement; however, the variability of the Ci optical features along the day present large discrepancies.
In comparisonwith CALIOP data, Ci clouds are observed at similar altitudes (around 10–13kmheight); however,
differences are found mostly in CCOD values for subtropical Ci clouds, whereas LR values are in a closer
agreement. These differences are carefully examined in relation with the closest CALIPSO overpass time and distance
from the station (N70 km far), inferring the irregular extension and inhomogeneity of the Ci clouds over
each study area. These considerations can be useful for assimilation of the Ci features into climate models and
evaluation of future space-borne lidar observations of Ci clouds, especially for the future ESA/Copernicus-Sentinel
and ESA/EarthCARE missions.
Como referenciar
CORDOBA JABONERO, CARMEN; LOPES, FABIO J.S.; LANDULFO, EDUARDO; CUEVAS, EMILIO; OCHOA, HECTOR; GIL-OJEDA, MANUEL. Diversity on subtropical and polar properties as derived from both ground-based lidars and CALIPSO/CALIOP measurements. Atmospheric Research, v. 183, p. 151-165, 2017. DOI: 10.1016/j.atmosres.2016.08.015. Disponível em: http://repositorio.ipen.br/handle/123456789/26773. Acesso em: 30 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.