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German Remote Sensing Data Center – German Aerospace Center (DLR), Oberpfaffenhofen, Germany
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- PublicationOpen AccessInvestigation of gravity wave activity based on NDMC, NDACC and CTBTO measurements(2014-04-27)
; ; ; ; ; ; ; ; ; ; ;Wüst, S.; Deutsches Zentrum für Luft- und Raumfahrt Oberpfaffenhofen (DLR), Germany ;Schmidt, C.; Deutsches Zentrum für Luft- und Raumfahrt Oberpfaffenhofen (DLR), Germany ;Kramer, R.; Deutsches Zentrum für Luft- und Raumfahrt Oberpfaffenhofen (DLR), Germany ;Bittner, M.; Deutsches Zentrum für Luft- und Raumfahrt Oberpfaffenhofen (DLR), Germany ;Hauchecorne, A.; Centre national de la recherche scientifique (CNRS), France ;Keckhut, P.; Centre national de la recherche scientifique (CNRS), France ;LePichon, A.; Commissariat à l’énergie atomique et aux énergies alternatives (CEA), France ;Marchetti, E.; Università degli studi di firenze (UNIFI) ;Mze, N.; Centre national de la recherche scientifique (CNRS), France ;Pecora, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia; ; ; ; ; ; ; ; ; GRIPS (Ground based Infrared P-branch Spectrometer) airglow measurements allow the derivation of kinetic temperature in the mesopause region during night with a temporal resolution of 10s to 15s. Amongst others, these time series can be used for the investigation of atmospheric dynamics like gravity wave activity. GRIPS measurements are performed in the framework of NDMC – the international Network for the Detection of Mesospheric Change. The project ARISE combines NDMC, NDACC (Network for the Detection of Atmospheric Composition Change) and CTBTO (Comprehensive Nuclear-Test-Ban Treaty Organization)measurements to infer a new 3D image of atmospheric dynamics from ground to mesopause. In this context, GRIPS data of about two to three years collected at the Observatory Haute-Provence, France and Catania, Italy are utilized to derive an index for shortand long-period gravity wave activity on daily and seasonal base. This time period includes also a stratospheric warming event. Potential energy density is calculated and compared with NDACC measurements at Haute-Provence; differences are discussed. For the measurements at the Italian station, comparisons of gravity wave and volcanic activity relying on infrasound array and seismic measurements are performed. First hints for volcanic induced mesopause gravity wave activity are presented.113 52 - PublicationRestrictedFirst ground-based observations of mesopause temperatures above the Eastern-Mediterranean Part I: Multi-day oscillations and tides(2017-03-01)
; ; ; ; ; ; ;Silber, I.; Department of Geosciences, Tel Aviv University, Tel Aviv, Israel ;Price, C.; Department of Geosciences, Tel Aviv University, Tel Aviv, Israel ;Schmidt, C.; German Remote Sensing Data Center – German Aerospace Center (DLR), Oberpfaffenhofen, Germany ;Wüst, S.; German Remote Sensing Data Center – German Aerospace Center (DLR), Oberpfaffenhofen, Germany ;Bittner, M.; German Remote Sensing Data Center – German Aerospace Center (DLR), Oberpfaffenhofen, Germany ;Pecora, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia; ; ; ; ; The mesopause region (~90 km altitude) is the coldest region of our atmosphere, and is found at the boundary between the upper mesosphere and lower thermosphere. Ground-based spectrometers, which are sensitive to the emissions from the hydroxyl (OH*) airglow layer (lying at ~87 km altitude), are used to monitor the temperature variability within the mesosphere-lower-thermosphere (MLT), at high temporal resolution. The variability of the MLT region of the atmosphere is driven by momentum deposition from gravity waves, atmospheric tides and planetary waves. The displacement of air caused by these waves can produce strong temperature, wind and species concentration perturbations. In this study we present an analysis of 4-years of OH* rotational temperature data, acquired with the German Aerospace Center (DLR) GRIPS-10 (Ground Based Infrared P-branch Spectrometer) instrument, which was installed in Israel in November 2011. This instrument provided the first long-term ground-based observations of airglow emissions in the Eastern Mediterranean. We show the nocturnal mean temperature analysis, which includes time series as well as spectral analysis of the data. In addition, we obtain (migrating) tidal oscillation estimates from the high resolution (1 min) data, by using harmonic fitting, and we analyze the variability of planetary wave signatures in the residual temperature data, which are retrieved after the removal of the tidal harmonic fits from the data. In this analysis of the residual data we find a dominant quasi-5–7 day planetary wave influence on the mesopause temperatures above the Eastern Mediterranean.136 11