@Article{AndrioliBatCleSchBur:2015:MuObGr,
author = "Andrioli, V{\^a}nia F{\'a}tima and Batista, Paulo Prado and
Clemesha, Barclay Robert and Schuch, Nelson Jorge and Buriti, R.
A.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Universidade Federal de Campina Grande
(UFCG)}",
title = "Multi-year observations of gravity wave momentum fluxes at low and
middle latitudes inferred by all-sky meteor radar",
journal = "Annales Geophysicae",
year = "2015",
volume = "33",
number = "9",
pages = "1183--1193",
month = "Sept.",
keywords = "Meteorology and atmospheric dynamics (middle atmosphere
dynamics).",
abstract = "We have applied a modified composite day analysis to the Hocking
(2005) technique to study gravity wave (GW) momentum fluxes in the
mesosphere and lower thermosphere (MLT). Wind measurements from
almost continuous meteor radar observations during June
2004-December 2008 over S{\~a}o Jo{\~a}o do Cariri (Cariri; 7°
S, 36° W), April 1999-November 2008 over Cachoeira Paulista (CP;
23° S, 45° W), and February 2005-December 2009 over Santa Maria
(SM; 30° S, 54° W) were used to estimate the GW momentum fluxes
and variances in the MLT region. Our analysis can provide monthly
mean altitude profiles of vertical fluxes of horizontal momentum
for short-period (less than 2-3 h) GWs. The averages for each
month throughout the entire data series have shown different
behavior for the momentum fluxes depending on latitude and
component. The meridional component has almost the same behavior
at the three sites, being positive (northward), for most part of
the year. On the other hand, the zonal component shows different
behavior at each location: it is positive for almost half the year
at Cariri and SM but predominantly negative over CP. Annual
variation in the GW momentum fluxes is present at all sites in the
zonal component and also in SM at 89 km in the meridional
component. The seasonal analysis has also shown a 4-month
oscillation at 92.5 km over SM in the zonal component and over CP
at the same altitudes but for the meridional component.",
doi = "10.5194/angeo-33-1183-2015",
url = "http://dx.doi.org/10.5194/angeo-33-1183-2015",
issn = "0992-7689",
language = "en",
urlaccessdate = "20 maio 2024"
}