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\begin{document}

\title{Global stratospheric net momentum flux and drag of gravity waves from
one year of radio occultations}



\author[1]{Peter Alexander}%
\author[2]{Alejandro de la Torre}%
\author[3]{Torsten Schmidt}%
\affil[1]{IFIBA}%
\affil[2]{Universidad Austral}%
\affil[3]{GFZ German Research Center for Geosciences}%


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  \date{June 14, 2024}


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\begin{abstract}
Gravity waves (GW) transport momentum flux (MF) and energy across the
lower, middle and upper atmosphere. Global Positioning System (GPS)
radio occultation (RO) is one of the measuring techniques used onboard
satellites to provide vertical temperature profiles with global and
permanent coverage. These retrievals may be applied in the study of GW.
Some usual analysis methods provide absolute GWMF, but are missing its
net direction. This happens because the procedures cannot deduce the
propagation sense of GW and hence the direction of MF. We therefore
recall here a recently presented method that allows the net calculation
with four close in space and time RO soundings (quartets). We use about
10,000 daily retrievals from March 1, 2022 to February 28, 2023 to study
the seasonal and latitudinal global characteristics of net GWMF in the
height interval from 20 to 35 km. About 600 quartets were found.%
\end{abstract}%



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