@Article{GuharayBatiClem:2014:VaSeSc,
author = "Guharay, Amitava and Batista, Paulo Prado and Clemesha, Barclay
Robert",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)}",
title = "On the variability of the seasonal scale oscillations over
Cachoeira Paulista (22.7°S, 45°W), Brazil",
journal = "Earth, Planets and Space",
year = "2014",
volume = "66",
number = "1",
pages = "45",
note = "{Setores de Atividade: Pesquisa e desenvolvimento
cient{\'{\i}}fico.}",
keywords = "seasonal oscillations, diurnal tide, quasi-2-day wave.",
abstract = "The characteristics of long period atmospheric oscillations are
studied using long-term meteor radar wind observations over a
low-latitude Brazilian station, Cachoeira Paulista (22.7°S, 45°W).
The semiannual oscillation (SAO) amplitude decreases gradually
with altitude in the mesopause region, while the annual
oscillation (AO) amplitude exhibits a minimum at mid-mesopause
with significant interannual variability. The quasi-biennial
oscillation (QBO) obtained by removing the SAO and AO from the
zonal wind exhibits an out-of-phase relationship at lower
mesopause heights (approximately 81 km) and mid-stratosphere
(approximately 10 hPa). There is an evident signature of
modulation of the mesospheric SAO (MSAO) and mesospheric AO (MAO)
by the QBO. The diurnal tide is surmised to contribute
significantly to drive the easterly phase of these oscillations,
especially MSAO and MAO through depositing westward momentum to
the background wind. The westerly phase of the MSAO is believed to
support the growth of the quasi-2-day wave (QTDW) by wave
filtering. The QTDW is found to be strong during the easterly
phase of the MAO indicating a possible existence of the
barotropic/baroclinic instability during summer and a possible
role of the QTDW towards westward forcing of the background
wind.",
doi = "10.1186/1880-5981-66-45",
url = "http://dx.doi.org/10.1186/1880-5981-66-45",
issn = "1343-8832",
label = "lattes: 2306964700488382 2 GuharayBatiClem:2014:VaSeSc",
language = "en",
targetfile = "2014eps_GuharaySAOAO.pdf",
url = "http://www.earth-planets-space.com/content/66/1/45",
urlaccessdate = "2025, Feb. 14"
}