@Article{GomesAPHSHSG:2019:ClEaWa,
author = "Gomes, Helber B. and Ambrizzi, T{\'e}rcio and Pontes da Silva,
Bruce F. and Hodges, Kevin and Silva Dias, Pedro L. and Herdies,
Dirceu Luis and Silva, Maria Cristina L. and Gomes,
Heliof{\'a}bio B.",
affiliation = "{Universidade Federal do Alagoas (UFAL)} and {Universidade de
S{\~a}o Paulo (USP)} and {Instituto de Pesquisa Capixaba} and
{University of Reading} and {Universidade de S{\~a}o Paulo (USP)}
and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Universidade Federal do Alagoas (UFAL)} and {Universidade Federal
do Alagoas (UFAL)}",
title = "Climatology of easterly wave disturbances over the tropical South
Atlantic",
journal = "Climate Dynamics",
year = "2019",
volume = "51",
pages = "1--19",
keywords = "Easterly waves disturbances · Tropical South Atlantic · Northeast
Brazil and climatology.",
abstract = "A 21-year climatology of Easterly Waves Disturbances (EWDs) over
the tropical South Atlantic (TSA) has been examined using data
from the European Centers for Medium-Range Weather Forecasting
interim reanalysis (ERAI) and satellite data. This includes the
frequency distribution of EWDs and their interannual variability.
The large-scale environment associated with EWDs has been
investigated for the coastal region of Northeast Brazil (NEB) for
the rainy (AprilAugust) season using a composite analysis. EWDs
were first identified in ERAI, resulting in 518 observed cases.
These were found to show notable interannual variability with
around 1640 episodes each year and with an average lifetime of 46
days. Of the identified EWDs, 97% reached the coast of NEB, of
which 64% were convective in nature and 14% moved across the NEB
region and reached the Amazon. The annual occurrence of EWDs seems
to be lower (higher) during El Niņo (La Niņa). The monthly
occurrence of EWDs shows higher activity in the rainy season. EWDs
originate in association with four types of system: cold fronts,
convective clusters from the west coast of Africa, Intertropical
Convergence Zone and Tropical Upper Tropospheric Cyclonic
Vortices. The composite analysis indicates strong relative
vorticity and divergence anomalies at low levels, as well as in
the vertical profiles of relative humidity and vertical velocity
(omega). The precipitation composites show that the EWDs propagate
between the TSA and NEB and contribute at least 60% of the total
rainfall over the east coast of NEB throughout the rainy season.",
doi = "10.1007/s00382-019-04667-7",
url = "http://dx.doi.org/10.1007/s00382-019-04667-7",
issn = "0930-7575",
label = "lattes: 3752951275341381 6 GomesAPHSHSG:2019:ClEaWa",
language = "en",
targetfile = "Gomes2019_Article_ClimatologyOfEasterlyWaveDistu.pdf",
urlaccessdate = "19 mar. 2024"
}