Dissertation / PhD Thesis/Book

PreJuSER-12492

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Satellitengestütze Schwerewellenmessungen in der Atmosphäre und Perspektiven einer zukünftigen ESA Mission (PREMIER)

Höfer, S. (Corresponding author)FZJ*

2010
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich
ISBN: 978-3-89336-637-8

Please use a persistent id in citations: http://hdl.handle.net/2128/12505

Abstract: Gravity waves play a key role in middle atmosphere dynamics. For an improved understanding of gravity waves and their interactions with the atmosphere, global modeling and measurements with high resolution are required. In this work we validate the gravity waves resolved in ECMWF ($\textbf{E}$uropean $\textbf{C}$entre for $\textbf{M}$edium-Range $\textbf{W}$eather $\textbf{F}$orecasts) model-data by comparison with gravity wave analysis of global satellite observations by SABER ($\textbf{S}$ounding of the $\textbf{A}$tmosphere using $\textbf{B}$roadband $\textbf{E}$mission $\textbf{R}$adiometry). The validation of the model-data shows that the modeled wave amplitudes are lowered by a factor of two in the troposphere and lower stratosphere. Above 50km altitude, the vertical resolution of ECMWF is reduced and accordingly the gravity waves are strongly damped. It is also shown that gravity waves with orographic sources are better represented in the model-data than convectively exited waves. Gravity waves with convective sources are suppressed by the resolution of the model and are only represented with small amplitudes. The validated ECMWF-data set can be used to simulate measurements of a future $\textbf{I}$nfrared $\textbf{L}$imb $\textbf{I}$mager (ILI). The investigation of the ILI-data shows that the measurement resolution is sufficient to calculate gravity wave momentum flux in both horizontal directions and that it will be possible to receive information about the propagation direction of the waves. The validated model-data are also used to improve the assumptions made by using temperature data to receive gravity wave momentum flux. The results of this study shows clearly the high potential of ILI-data for global measurements of gravity waves and the retrieval of gravity wave parameters. In particular momentum flux depending on the propagation direction of the waves will improve global circulation models.

Note: Record converted from VDB: 12.11.2012
Note: Univ. Wuppertal, Diss., 2010

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Research Program(s):

1. Atmosphäre und Klima (P23)

Appears in the scientific report 2010

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Database coverage:

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