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1.
Discontinuous Galerkin method for linear free-surface gravity waves
J. J. W. van der Vegt, Satyendra Tomar, 2005, original scientific article

Found in: ključnih besedah
Keywords: discontinuous Galerkin method, gravity waves, elliptic partial differential equations
Published: 13.11.2018; Views: 1887; Downloads: 0
.pdf Fulltext (390,95 KB)

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Orographic gravity waves in OH-airglow imaging systems
Samo Stanič, Carsten Schmidt, Patrick Hannawald, René Sedlak, Jonas Till, Sabine Wuest, Michael Bittner, 2020, published scientific conference contribution abstract

Abstract: Atmospheric dynamics is strongly influenced by waves on different scales. Airflow over mountains can lead to all kinds of atmospheric waves, planetary and gravity waves as well as infrasound. Under certain circumstances these waves can propagate through the atmosphere and lead to a re- distribution of energy. In the case of gravity waves, a stably stratified atmosphere is a mandatory requirement for their generation and vertical propagation. Additionally, the vertical propagation depends on the horizontal wind field. In the Alpine and pre-Alpine region, we currently operate five OH-airglow imaging systems, which allow the investigation of orographic gravity waves. Depending on tropo-, strato- and mesospheric wind and temperature, it is checked which wavelengths can propagate into the fields of view of our instruments. This is done for a whole year in order to take into account annual and semi- annual cycles in wind and temperature. Concerning the generation of gravity waves, we put our focus on our OH-airglow imager (FAIM) deployed at Otlica (45.9°N, 13.9°E), Slovenia. Here, we also have additional measurements of an OH-airglow spectrometer (GRIPS). In case studies, we investigate whether strong wind events (Bora) lead to strong gravity waves activity or enhanced potential energy density.
Found in: ključnih besedah
Keywords: Orographic gravity waves, Bora, Otlica, Slovenia, OH-airglow imaging
Published: 08.10.2020; Views: 1266; Downloads: 0
.pdf Fulltext (290,87 KB)

4.
Gravity wave instability structures and turbulence from more than 1.5 years of OH[ast] airglow imager observations in Slovenia
Samo Stanič, Sabine Wüst, Michael Bittner, Carsten Schmidt, René Sedlak, Patrick Hannawald, 2021, original scientific article

Abstract: We analyzed 286 nights of data from the OH* airglow imager FAIM 3 (Fast Airglow IMager) acquired at Otlica Observatory, Slovenia, between 26 October 2017 and 6 June 2019. Measurements were performed with a spatial resolution of 24 m per pixel and a temporal resolution of 2.8 s. Multiple turbulence episodes were observed and the energy dissipation rate in the upper mesosphere/lower thermosphere region was estimated from image sequences in 25 cases. Values range around 0.08 and 9.03 W/kg and would lead to an approximated localized maximum heating of 0.03–3.02 K per turbulence event.
Found in: ključnih besedah
Summary of found: ...upper mesosphere, lower thermosphere, remote sensing, gravity waves, turbulence, Bora episodes...
Keywords: upper mesosphere, lower thermosphere, remote sensing, gravity waves, turbulence, Bora episodes
Published: 25.10.2021; Views: 622; Downloads: 0
.pdf Fulltext (2,08 MB)

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