@Article{AssireuDauhSantLore:2017:ObSaTr,
author = "Assireu, Arcilan T. and Dauhut, Thibaut and Santos, Francisco A.
dos and Lorenzzetti, Jo{\~a}o Ant{\^o}nio",
affiliation = "{Universidade Federal de Itajub{\'a} (UNIFEI)} and
{Universit{\'e} de Toulouse} and {PROOCEANO Servi{\c{c}}o
Oceanogr{\'a}fico} and {Instituto Nacional de Pesquisas Espaciais
(INPE)}",
title = "Near-inertial motions in the Brazil Current at 24°S-36°S:
Observations by satellite tracked drifters",
journal = "Continental Shelf Research",
year = "2017",
volume = "145",
pages = "1--12",
month = "Aug.",
keywords = "Near-inertial currentsBrazil CurrentDriftersSubmesoscale flow.",
abstract = "Increased spatial and temporal resolution of recent observations
and modeling have pointed out the importance of small scale
structures (in the range of 150 km) for the mixing processes in
the ocean. Based on high-frequency drifter measurements, we show
here that the near-inertial currents (NICs) can contribute
significantly to the surface kinetic energy in the Brazil Current
(BC) region and, therefore, should be properly taken into account
in the studies of transport and mixing processes. To characterize
these submesoscale features, we examine the current response to
the wind forcing in the Brazilian ocean margin between 24°S and
36°S using 3-hourly sampled trajectories of satellite-tracked
drifters. Our results indicate a preference for anti-cyclonic
circular motions, with a rotating period close to the local
inertial period, consistent with near-inertial motions in the
Southern Hemisphere (SH). Wind stress time series, from three
months of wind measurements, along with synoptic weather charts,
are used to relate the observed NICs to the atmospheric forcing.
During SH spring, NICs occur in 4.7\−15 day bursts and
account for 1545% of the total surface current variance. This
intermittency is related to atmospheric cold frontal passages, low
pressure systems, and sea breeze/land breeze circulations. The
predominance of NICs south of 28°S appears to be related to the
increased Effective Inertial Frequency (EIF), which is the
inertial frequency changed by the sub-inertial background flow.",
doi = "10.1016/j.csr.2017.07.005",
url = "http://dx.doi.org/10.1016/j.csr.2017.07.005",
issn = "0278-4343",
language = "en",
targetfile = "assireu_near.pdf",
urlaccessdate = "04 maio 2024"
}