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    Academic Journals

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• Quantification and mitigation of the instrument effects and uncertainties of the airborne limb imaging FTIR GLORIA.

  Authors:Jörn Ungermann, Anne Kleinert, Guido Maucher, Irene Bartolomé, Felix Friedl-Vallon, Sören Johansson, et al.From:Atmospheric Measurement Techniques (Vol. 15, Issue 8) Peer-Reviewed

  Apr. 25, 2022322 words Brief article The Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA) is an infrared imaging FTS (Fourier transform spectrometer) with a 2-D infrared detector that is operated on two high-flying research aircraft....

• Redistribution of total reactive nitrogen in the lowermost Arctic stratosphere during the cold winter 2015/2016.

  Authors:Helmut Ziereis, Peter Hoor, Jens-Uwe Grooß, Andreas Zahn, Greta Stratmann, Paul Stock, et al.From:Atmospheric Chemistry and Physics (Vol. 22, Issue 5) Peer-Reviewed

  Mar. 17, 2022480 words Article During winter 2015/2016, the Arctic stratosphere was characterized by extraordinarily low temperatures in connection with a very strong polar vortex and with the occurrence of extensive polar stratospheric clouds. From...

• Biomass burning pollution in the South Atlantic upper troposphere: GLORIA trace gas observations and evaluation of the CAMS model.

  Authors:Sören Johansson, Gerald Wetzel, Felix Friedl-Vallon, Norbert Glatthor, Michael Höpfner, Anne Kleinert, et al.From:Atmospheric Chemistry and Physics (Vol. 22, Issue 5) Peer-Reviewed

  Mar. 17, 2022391 words Report, Brief articl... In this study, we present simultaneous airborne measurements of peroxyacetyl nitrate (PAN), ethane (C.sub.2 H.sub.6 ), formic acid (HCOOH), methanol (CH.sub.3 OH), and ethylene (C.sub.2 H.sub.4) above the South Atlantic...

• Challenge of modelling GLORIA observations of upper troposphere-lowermost stratosphere trace gas and cloud distributions at high latitudes: a case study with state-of-the-art models.

  Authors:Florian Haenel, Wolfgang Woiwode, Jennifer Buchmüller, Felix Friedl-Vallon, Michael Höpfner, Sören Johansson, et al.From:Atmospheric Chemistry and Physics (Vol. 22, Issue 4) Peer-Reviewed

  Mar. 3, 2022635 words Case study Water vapour and ozone are important for the thermal and radiative balance of the upper troposphere (UT) and lowermost stratosphere (LMS). Both species are modulated by transport processes. Chemical and microphysical...

• POLSTRACC: Airborne Experiment for Studying the Polar Stratosphere in a Changing Climate with the High Altitude and Long Range Research Aircraft (HALO): The POLSTRACC mission provided a wealth of data on the structure and comparison of the Arctic lower-most stratosphere and upper troposphere during the extraordinarily cold winter 2015/16.

  Authors:Hermann Oelhaf, Bjorn-Martin Sinnhuber, Wolfgang Woiwode, Harald Bonisch, Heiko Bozem, Andreas Engel, et al.From:Bulletin of the American Meteorological Society (Vol. 100, Issue 12) Peer-Reviewed

  Dec. 201913,407 words Article 1530LABSTRACT The Polar Stratosphere in a Changing Climate (POLSTRACC) mission employed the German High Altitude and Long Range Research Aircraft (HALO). The payload comprised an innovative combination of remote sensing and...

• Observation of cirrus clouds with GLORIA during the WISE campaign: detection methods and cirrus characterization.

  Authors:Irene Bartolome Garcia, Reinhold Spang, Jörn Ungermann, Sabine Griessbach, Martina Krämer, Michael Höpfner, et al.From:Atmospheric Measurement Techniques (Vol. 14, Issue 4) Peer-Reviewed

  Apr. 29, 2021294 words Brief article Cirrus clouds contribute to the general radiation budget of the Earth and play an important role in climate projections. Of special interest are optically thin cirrus clouds close to the tropopause due to the fact that...

• High-resolution optical constants of crystalline ammonium nitrate for infrared remote sensing of the Asian Tropopause Aerosol Layer.

  Authors:Robert Wagner, Baptiste Testa, Michael Höpfner, Alexei Kiselev, Ottmar Möhler, Harald Saathoff, et al.From:Atmospheric Measurement Techniques (Vol. 14, Issue 3) Peer-Reviewed

  Mar. 11, 2021224 words Brief article Infrared spectroscopic observations have shown that crystalline ammonium nitrate (AN) particles are an abundant constituent of the upper tropospheric aerosol layer which is formed during the Asian summer monsoon period,...

• Technical note: Lowermost-stratosphere moist bias in ECMWF IFS model diagnosed from airborne GLORIA observations during winter-spring 2016.

  Authors:Wolfgang Woiwode, Andreas Dörnbrack, Inna Polichtchouk, Sören Johansson, Ben Harvey, Michael Höpfner, et al.From:Atmospheric Chemistry and Physics (Vol. 20, Issue 23) Peer-Reviewed

  Dec. 11, 2020329 words Brief article Numerical weather forecast systems like the ECMWF IFS (European Centre for Medium-Range Weather Forecasts - Integrated Forecasting System) are known to be affected by a moist bias in the extratropical lowermost...

• Superposition of gravity waves with different propagation characteristics observed by airborne and space-borne infrared sounders.

  Authors:Isabell Krisch, Manfred Ern, Lars Hoffmann, Peter Preusse, Cornelia Strube, Jörn Ungermann, et al.From:Atmospheric Chemistry and Physics (Vol. 20, Issue 19) Peer-Reviewed

  Oct. 7, 2020328 words Brief article Many gravity wave analyses, based on either observations or model simulations, assume the presence of only a single dominant wave. This paper shows that there are much more complex cases with gravity waves from multiple...

• 3-D tomographic observations of Rossby wave breaking over the North Atlantic during the WISE aircraft campaign in 2017.

  Authors:Lukas Krasauskas, Jörn Ungermann, Peter Preusse, Felix Friedl-Vallon, Andreas Zahn, Helmut Ziereis, et al.From:Atmospheric Chemistry and Physics (Vol. 21, Issue 13) Peer-Reviewed

  July 7, 2021384 words Brief article This paper presents measurements of ozone, water vapour and nitric acid (HNO.sub.3) in the upper troposphere/lower stratosphere (UTLS) over North Atlantic and Europe. The measurements were acquired with the Gimballed...

• Airborne limb-imaging measurements of temperature, HNO.sub.3, O.sub.3, ClONO.sub.2, H.sub.2O and CFC-12 during the Arctic winter 2015/2016: characterization, in situ validation and comparison to Aura/MLS

  Authors:Soren Johansson, Wolfgang Woiwode, Michael Hopfner, Felix Friedl-Vallon, Anne Kleinert, Erik Kretschmer, et al.From:Atmospheric Measurement Techniques (Vol. 11, Issue 8) Peer-Reviewed

  Aug. 14, 2018377 words Author abstract, Bri...

  The Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA) was operated on board the German High Altitude and Long Range Research Aircraft (HALO) during the PGS (POLSTRACC/GW-LCYCLE/SALSA) aircraft...

• Pollution trace gas distributions and their transport in the Asian monsoon upper troposphere and lowermost stratosphere during the StratoClim campaign 2017.

  Authors:Sören Johansson, Michael Höpfner, Oliver Kirner, Ingo Wohltmann, Silvia Bucci, Bernard Legras, et al.From:Atmospheric Chemistry and Physics (Vol. 20, Issue 23) Peer-Reviewed

  Dec. 2, 2020394 words Brief article We present the first high-resolution measurements of pollutant trace gases in the Asian summer monsoon upper troposphere and lowermost stratosphere (UTLS) from the Gimballed Limb Observer for Radiance Imaging of the...

• 3-D tomographic limb sounder retrieval techniques: irregular grids and Laplacian regularisation

  Authors:Lukas Krasauskas, Jorn Ungermann, Stefan Ensmann, Isabell Krisch, Erik Kretschmer, Peter Preusse, et al.From:Atmospheric Measurement Techniques (Vol. 12, Issue 2) Peer-Reviewed

  Feb. 7, 2019227 words Author abstract, Bri...

  Multiple limb sounder measurements of the same atmospheric region taken from different directions can be combined in a 3-D tomographic retrieval. Mathematically, this is a computationally expensive inverse modelling...

• Sampling bias adjustment for sparsely sampled satellite measurements applied to ACE-FTS carbonyl sulfide observations

  Authors:Corinna Kloss, Marc von Hobe, Michael Hapfner, Kaley A. Walker, Martin Riese, Jorn Ungermann, et al.From:Atmospheric Measurement Techniques (Vol. 12, Issue 4) Peer-Reviewed

  Apr. 8, 201955 words Author abstract, Bri... Byline: Corinna Kloss, Marc von Hobe, Michael Hö,pfner, Kaley A. Walker, Martin Riese, Jö,rn Ungermann, Birgit Hassler, Stefanie Kremser, Greg E. Bodeker To access, purchase, authenticate, or subscribe to the...

• Cirrus cloud shape detection by tomographic extinction retrievals from infrared limb emission sounder measurements.

  Authors:Jörn Ungermann, Irene Bartolome, Sabine Griessbach, Reinhold Spang, Christian Rolf, Martina Krämer, et al.From:Atmospheric Measurement Techniques (Vol. 13, Issue 12) Peer-Reviewed

  Dec. 21, 2020198 words Brief article An improved cloud-index-based method for the detection of clouds in limb sounder data is presented that exploits the spatial overlap of measurements to more precisely detect the location of (optically thin) clouds. A...

• Pollution trace gases C.sub.2H.sub.6, C.sub.2H.sub.2, HCOOH, and PAN in the North Atlantic UTLS: observations and simulations.

  Authors:Gerald Wetzel, Felix Friedl-Vallon, Norbert Glatthor, Jens-Uwe Grooß, Thomas Gulde, Michael Höpfner, et al.From:Atmospheric Chemistry and Physics (Vol. 21, Issue 10) Peer-Reviewed

  May 27, 2021407 words Article Measurements of the pollution trace gases ethane (C.sub.2 H.sub.6 ), ethyne (C.sub.2 H.sub.2 ), formic acid (HCOOH), and peroxyacetyl nitrate (PAN) were performed in the North Atlantic upper troposphere and lowermost...

• Limited angle tomography of mesoscale gravity waves by the infrared limb-sounder GLORIA

  Authors:Isabell Krisch, Jorn Ungermann, Peter Preusse, Erik Kretschmer, and Martin RieseFrom:Atmospheric Measurement Techniques (Vol. 11, Issue 7) Peer-Reviewed

  July 23, 2018384 words Author abstract, Bri...

  Three-dimensional measurements of gravity waves are required in order to quantify their direction-resolved momentum fluxes and obtain a better understanding of their propagation characteristics. Such 3-D measurements...

• Orographically induced spontaneous imbalance within the jet causing a large-scale gravity wave event.

  Authors:Markus Geldenhuys, Peter Preusse, Isabell Krisch, Christoph Zülicke, Jörn Ungermann, Manfred Ern, et al.From:Atmospheric Chemistry and Physics (Vol. 21, Issue 13) Peer-Reviewed

  July 9, 2021513 words Article To better understand the impact of gravity waves (GWs) on the middle atmosphere in the current and future climate, it is essential to understand their excitation mechanisms and to quantify their basic properties. Here a...