@Article{GanDalP:2016:EnSoPa,
author = "Gan, Manoel Alonso and Dal Piva, Everson",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Universidade Federal de Santa Maria (UFSM)}",
title = "Energetics of southeastern Pacific cut\‑off lows",
journal = "Climate Dynamics",
year = "2016",
volume = "46",
number = "11/12",
pages = "3453--3462",
month = "June",
keywords = "Ageostrophic flux convergence, Baroclinic conversion, Barotropic
conversion, Cut-off low, Energetics.",
abstract = "The existence of cut-off lows (COLs) over South Pacific and South
America is often associated with adverse weather events such as
intense precipitation over the central region of South America,
frost episodes in southern Brazil and the development of Andes lee
cyclones and intense cyclones over the southern coast of Brazil.
Despite this importance, the formation and maintenance mechanisms
of the COLs are not well understood. To detail the significant
variability in terms of the eddy kinetic energy equation for fifty
cases of COLs that formed over the southeastern Pacific Ocean is
the aim of this study. Only the cases of COLs that formed over the
ocean and remained there during most of their life were chosen.
The main terms of the equation [ageostrophic flux convergence
(AFC), baroclinic conversion (BRC) and barotropic conversion
(BRT)] were calculated using the 6-hourly gridded data from the
National Centers for Environmental Prediction/Department of Energy
reanalysis. The formation mechanism of the COLs was associated
with BRC and AFC. During the midlife period, the BRC term
converted eddy kinetic energy to eddy potential energy and the AFC
had a positive contribution until 6 h after the midlife point. In
the dissipation phase, the BRC term remained positive and AFC
became negative. The BRT extracted kinetic energy from the COL
during the entire life cycle. The AFC term was the most important
in all phases of the cut-off lifetime, and it was the responsible
for extending the cut-off lifetime while the others terms were
negatives.",
doi = "10.1007/s00382-015-2779-7",
url = "http://dx.doi.org/10.1007/s00382-015-2779-7",
issn = "0930-7575",
label = "self-archiving-INPE-MCTI-GOV-BR",
language = "pt",
targetfile = "gan_energetics.pdf",
urlaccessdate = "27 abr. 2024"
}