Observational analysis of the daily cycle of the planetary boundary layer in the central Amazon during a non-El Niño year and El Niño year (GoAmazon project 2014/5)
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Published:2020-05-12
Issue:9
Volume:20
Page:5547-5558
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Carneiro Rayonil G.ORCID, Fisch Gilberto
Abstract
Abstract. The Amazon biome contains more than half of the remaining tropical
forests of the planet and has a strong impact on aspects of meteorology such
as the planetary boundary layer (PBL). In this context, the objective of
this study was to conduct observational evaluations of the daily cycle of
the height of the PBL during its stable (night) and convective (day) phases
from data that were measured and/or estimated using instruments such as a
radiosonde, sodar, ceilometer, wind profiler, lidar and microwave radiometer
installed in the central Amazon during 2014 (considered a typical year) and
2015 during which an intense El Niño–Southern Oscillation (ENSO) event
predominated during the GoAmazon experiment. The results from the four
intense observation periods (IOPs) show that during the day and night
periods, independent of dry or rainy seasons, the ceilometer is the
instrument that best describes the depth of the PBL when compared with in situ
radiosonde measurements. Additionally, during the dry season in 2015, the
ENSO substantially influenced the growth phase of the PBL, with a 15 %
increase in the rate compared to the same period in 2014.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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