@Article{RamosReyeFisc:2018:EvPlBo,
author = "Ramos, Diogo Nunes da Silva and Reyes Fernandez, Julio Pablo and
Fisch, Gilberto",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto de
Aeron{\'a}utica e Espa{\c{c}}o (IAE)}",
title = "Evolution of the Planetary Boundary Layer on the northern coast of
Brazil during the CHUVA campaign",
journal = "Atmospheric Research",
year = "2018",
volume = "203",
pages = "298--310",
month = "May",
keywords = "Tropical planetary boundary layer, Lapse rate, Wind profile,
Atmospheric stability, Nighttime precipitation.",
abstract = "This study aims to characterize the wind and thermodynamic
structure of the Planetary Boundary Layer (PBL) on the northern
coast of Brazil (NCB) via the CHUVA datasets. Three synoptic
conditions were present in the NCB region between March 1 and 25,
2010: a dry period, the Upper Tropospheric Cyclonic Vortex (UTCV)
and the Intertropical Convergence Zone (ITCZ). Nighttime
precipitation accounted for 78% of the total precipitation
observed in the month, mainly during the ITCZ. In general, the
surface meteorological fields were few changed by intense weather
events due to proximity to the ocean and the predominant
contribution of the northeasterly trade winds. There was also a
weak sea breeze signal that maintained the horizontal moisture
flow in the studied area. On dry days, the PBL depth was higher,
drier, and warmer, resulting in stronger winds below 500 m.
Moreover, trends throughout the period suggest that PBLs are
near-neutral below 500 m. However, the wind variability was
intensified by up to 20% due to downdrafts and higher wind shears
during the deep convection mechanisms derived by UTCV.
Furthermore, ITCZ mixed rainfall cooled the PBL at approximately 2
K, making it very stable according to the Richardson number
classification adopted. The observed temporal and spatial scale
represent challenges to the physical parameterizations used to
improve numerical weather prediction models over tropical coastal
areas.",
doi = "10.1016/j.atmosres.2017.12.016",
url = "http://dx.doi.org/10.1016/j.atmosres.2017.12.016",
issn = "0169-8095",
language = "en",
targetfile = "ramos_evolution.pdf",
urlaccessdate = "18 abr. 2024"
}