@Article{GuharayBatiClem:2015:VaDiTi,
author = "Guharay, A. and Batista, Paulo Prado and Clemesha, Barclay
Robert",
affiliation = "{Physical Research Laboratory} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)}",
title = "On the variability of the diurnal tide and coupling with planetary
waves in the MLT over Cachoeira Paulista (22.7°S, 45°W)",
journal = "Journal of Atmospheric and Solar-Terrestrial Physics",
year = "2015",
volume = "133",
month = "Oct.",
keywords = "Tides and planetary waves, Wave-wave nonlinear interactions,
Meteor radar observations.",
abstract = "Using meteor radar observations of four years in the mesosphere
and lower thermosphere (MLT) over a subtropical Brazilian station,
Cachoeira Paulista (22.7°S, 45°W), the temporal variability
characteristics of the diurnal tide have been studied. In addition
to the semiannual, annual and interannual variations, the diurnal
tide amplitude exhibits clear intermittent modulation at periods
of planetary waves. The tidal amplitude exhibits clear seasonal
pattern with largest amplitude in fall equinox. The dominant
periods of modulation of the diurnal tide are found to be greater
than 10 days in the MLT. The diurnal tide, as detected in the
power spectra of the horizontal winds, shows a spread in period
around the central period (24 h) which is an indication of
nonlinear interactions between the diurnal tide and planetary
waves. A bispectral analysis reveals prominent triplets (two
primary waves and a secondary wave) confirming the interaction of
the diurnal tide with planetary waves persistent over a broad
spectral range. Also there is an indication of coupling of the
diurnal tide with the intraseasonal oscillations at various times
of the year.",
doi = "10.1016/j.jastp.2015.07.016",
url = "http://dx.doi.org/10.1016/j.jastp.2015.07.016",
issn = "1364-6826",
language = "en",
urlaccessdate = "01 maio 2024"
}