@PhDThesis{Ayorinde:2022:StAtGr,
author = "Ayorinde, Toyese Tunde",
title = "Study on atmospheric gravity wave propagation in the troposphere,
stratosphere and mesosphere by using satellite measurements",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2022",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2021-12-17",
keywords = "atmospheric gravity waves, COSMIC-2 radio occultation, TIMED/SABER
satellites, potential energy, momentum flux, ondas de gravidade
atmosf{\'e}rica, COSMIC-2 r{\'a}dio oculta{\c{c}}{\~a}o,
sat{\'e}lites TIMED/SABER, energia potencial, fluxo de momento.",
abstract = "The present study focuses on the gravity waves propagation between
the upper troposphere up to the lower thermosphere using
temperature profiles retrieved from COSMIC-2 and METOP radio
occultation measurements, and the TIMED/SABER limb measurements
over South America. Using the temperature, we derived the gravity
wave potential energy (Ep). The gravity wave horizontal wavelength
and momentum flux (MF) were obtained by using the boundary
conditions to select 3- points for COSMIC-2 temperature profiles
and 2-points for TIMED/SABER. In the tropical zone, a direct
connection between the precipitable water vapour (PWV) and gravity
waves was discovered. However, in the subtropical region, an
anticorrelation between the PWV and gravity waves was observed. In
the extratropical region, the gravity waves potentially propagate
from the lower stratosphere up to the middle mesosphere during the
winter. Low gravity wave activity was observed in the sub-
tropical and extratropical regions during Summer. We discovered
that COSMIC-2 and TIMED/SABER both detected similar results for
the gravity wave potential energy in the stratosphere. It was also
observed that the vertical coupling of gravity waves revealed
evidence of gravity wave filtering in the middle stratosphere and
a possible generation of secondary gravity waves during the
tropical Summer. In the extratropical region during the winter,
gravity waves have less dissipation and may propagate to the upper
mesosphere, resulting in gravity waves breaking in the lower
thermosphere. We also observed a latitudinal variation in the
horizontal wavelengths of large-scale gravity waves across South
America, with a greater horizontal wavelength (1150 < \λh <
1200 km) in the tropical area, which could be attributed to the
Coriolis force. There is considerable gravity wave activity over
the Andes Mountains in the subtropical region and over the
Patagonian mountains in the extratropics during the winter. The
most important conclusion of this study is the vertical coupling
of the stratosphere, mesosphere, and lower thermosphere through
the gravity wave propagation at various latitudes over South
America. RESUMO: O presente trabalho tem como objetivo o estudo da
propaga{\c{c}}{\~a}o de ondas gravidade entre a alta troposfera
e a baixa termosfera, empregando os perfis de temperatura da
constela{\c{c}}{\~a}o de sat{\'e}lites do COSMIC-2, METOP e o
sat{\'e}lite TIMED/SABER sobre a Am{\'e}rica do Sul. Utilizando
os perfis de temperatura foi poss{\'{\i}}vel calcular a energia
potencial (Ep) associada {\`a} atividade de ondas de gravidade. O
comprimento de onda horizontal e o fluxo de momento (FM) das ondas
de gravidade tamb{\'e}m foram determinados utilizando as
condi{\c{c}}{\~o}es de contorno para selecionar um conjunto de 3
perfis de temperatura dos sat{\'e}lites de R{\'a}dio
Oculta{\c{c}}{\~a}o (RO) e 2 perfis para o sat{\'e}lite
TIMED/SABER. Na regi{\~a}o tropical da Am{\'e}rica do Sul, foi
observada uma conex{\~a}o direta entre o vapor de {\'a}gua
precipit{\'a}vel (PWV) e as ondas de gravidade. Contudo na
regi{\~a}o subtropical, foi verificada uma
anticorrela{\c{c}}{\~a}o entre o PWV e as ondas de gravidade. As
ondas de gravidade observadas nas regi{\~o}es extratropicais
potencialmente se propagam da estratosfera inferior at{\'e} a
m{\'e}dia mesosfera durante o inverno. Uma baixa atividade de
ondas de gravidade foi observada nas zonas subtropicais e
extratropicais durante o ver{\~a}o. Tamb{\'e}m foi descoberto
que a energia potencial das ondas de gravidade observadas na
estratosfera pelos sat{\'e}lites COSMIC-2 e TIMED/SABER s{\~a}o
semelhantes. Entre as novas descobertas, o acoplamento vertical
das ondas de gravidade revelou evid{\^e}ncias de filtragem de
ondas de gravidade na m{\'e}dia estratosfera e uma
poss{\'{\i}}vel gera{\c{c}}{\~a}o de ondas de gravidade
secund{\'a}rias durante o ver{\~a}o tropical. Na regi{\~a}o
extratropical durante o inverno, as ondas de gravidade apresentam
menos dissipa{\c{c}}{\~a}o e podem se propagar para a mesosfera
superior, resultando na quebra das ondas de gravidade na baixa
termosfera.",
committee = "Saba, Marcelo Magalh{\~a}es Fares (presidente) and Wrasse,
Cristiano Max (orientador) and Takahashi, Hisao (orientador) and
Figueiredo, Cosme Alexandre de Oliveira Barros and Correia,
Em{\'{\i}}lia and Silva, Igo Paulino da and Rabiu, Babatunde",
englishtitle = "Estudo da propaga{\c{c}}{\~a}o da onda de gravidade
atmosf{\'e}rica na troposfera, estratosfera e mesosfera usando
medi{\c{c}}{\~o}es de sat{\'e}lite",
language = "en",
pages = "232",
ibi = "QABCDSTQQW/46A78AP",
url = "http://urlib.net/ibi/QABCDSTQQW/46A78AP",
targetfile = "publicacao.pdf",
urlaccessdate = "25 abr. 2024"
}