SciELO - Scientific Electronic Library Online

vol.50 issue1Identification of priority areas for landscape connectivity maintenance in the Xingu Area of Endemism in Brazilian AmazoniaEpidemiological and clinical aspects of snakebites in the upper Juruá River region, western Brazilian Amazonia author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Acta Amazonica

Print version ISSN 0044-5967On-line version ISSN 1809-4392


CARNEIRO, Rayonil Gomes; FISCH, Gilberto; BORGES, Camilla Kassar  and  HENKES, Alice. Erosion of the nocturnal boundary layer in the central Amazon during the dry season. Acta Amaz. [online]. 2020, vol.50, n.1, pp.80-89.  Epub Nov 25, 2019. ISSN 1809-4392.

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 (06:00 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.

Keywords : planetary boundary layer; turbulent kinetic energy; heat flux; NBL erosion.

        · abstract in Portuguese     · text in English     · English ( pdf )