Erosion of the nocturnal boundary layer in the central Amazon during the dry season
Acta amaz
;
50(1): 80-89, jan. - mar. 2020.
Article
in English
| LILACS
| ID: biblio-1118768
ABSTRACT
In this study, the erosion of the nocturnal boundary layer (NBL) was analyzed in the central Amazon during the dry season of 2014, using data from the GoAmazon 2014/5 Project and high-resolution model outputs (PArallelized Les Model - PALM). The dataset consisted of in situ (radiosonde) and remote sensing instruments measurements (Ceilometer, Lidar, Wind Profiler, microwave radiometer, and SODAR). The results showed that the NBL erosion occurred, on average, two hours after sunrise (0600 local time), and the sensible heat flux provided more than 50% of the sensible heating necessary for the erosion process to occur. After the erosion, the convective phase developed quickly (175.2 m h-1). The measurements of the remote sensors showed that the Ceilometer, in general, presented satisfactory results in relation to the radiosondes for measuring the height of the planetary boundary layer. The PALM simulations represented well the NBL erosion, with a small underestimation (≈ 20 m) at the beginning of this phase. In the final phase of NBL erosion and in the initial stage of the development of the convective boundary layer (CBL), the model presented satisfactory results, with heights of CBL ranging from 800 m to 1,650 m, respectively. (AU)
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Erosion
/
Amazonian Ecosystem
/
Dry Season
Language:
English
Journal:
Acta amaz
Journal subject:
Science
Year:
2020
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Instituto Nacional de Pesquisas Espaciais/BR
/
Instituto de Aeronáutica e Espaço/BR
/
Universidade Federal de Campina Grande/BR
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