Simulation concerning trigger and electron separation in the forward chambers of ZEUS, V. Wirth Diploma thesis, University of Bonn, 1987

A new collider HERA at DESY in Hamburg will probe kinematical regions of deep inelastic electron nucleon scattering, which are hitherto unexplored. One expects
reasonable rates for collisions up to several 10,000 GeV^2 for the momentum transfer squared Q^2. In particular, the available energy at HERA could reveal new heavy particles. The ZEUS collaboration is designing and constructing a universal detector suitably equipped to study those deep inelastic electron proton collisions.

This paper is concerned with two different questions related to background effects in the forward chambers of the inner detector of ZEUS.


First it is investigated to what extent the forward chambers can contribute to a first level trigger rejecting proton beam gas events. Such a trigger should yield a fast information on the position of the event vertex along the beam axis. Two different algorithms are studied and compared: the “center of gravity algorithm” and the “single track algorithm”. At first glance the “center of gravity algorithm” seems to work fairly well, but a more realistic simulation of background events renders it unsatisfactory. The “single track algorithm”, however, efficiently separates true events from background events and, apart from a distortion of the kinematics by mere geometrical acceptance of the detector, the latter algorithm proves rather unbiased. Moreover, it is shown that the combination with a trigger on transverse energy as provided by the calorimeter yields a further considerable reduction of the background.


The second investigation considers the identification of prompt electrons from heavy quark decay and the suppression of background electrons arising from Dalitz decay and gamma conversion within the material of the detector. This is essential since the number of background electrons in the forward chambers of the inner detector is at least by 2.5 orders of magnitude larger than the number of electrons from semileptonic heavy quark decay. Considering only those Dalitz decays and gamma conversion processes for which the identification of the e+e- pair is impossible by mere track reconstruction, one is left with the so-called “singles”, i.e. electrons which hardly can be separated from promptelectrons without further criteria. Even under optimistic assumptions the remaining background still exceeds the signal. However, as background and prompt electrons have considerably different spectra of momentum and transverse momentum, a cut on these quantities reduces the number of background electrons much more than the number of prompt electrons leading to a signal to background ratio larger than one.

The Seasonal Cycle of Stationary Planetary Waves in the Southern Stratosphere: A Numerical Study, V. Wirth, Master thesis, Massachusetts Institute of Technology, 1990

Stationary planetary waves in the southern stratosphere display a characteristic seasonal cycle with two maxima in early and late winter and a relative minimum in midwinter. Previous research suggests that this behaviour is mainly determined by seasonally varying transmission properties of the atmosphere with respect to wave propagation. A related question is whether the index of refraction adequately diagnoses the seasonal cycle in wave propagation. In the present thesis these issues are investigated with the help of a hemispheric, linear, quasigeostrophic model, which prescribes the wave at the top of the troposphere and solves for the wave in the stratosphere.

The model reproduces well the observed overall amplitude and phase behaviour including the direction of wave activity propagation. It is internally consistent in that the upper stratospheric wave can be qualitatively diagnosed using the refractive index. Certain low altitude features of the refractive index turn out to be important. A sensitivity study reveals that mainly the variation in zonal winds and less the variation in forcing contributes to the seasonal cyle. Wave response and refractive index are quite sensitive to variations in the zonal wind field at low altitudes and to such variations that change the jet structure of the wind field.

However, despite its internal consistency, the model fails to simulate more detailed features of the observed wave. In particular it does not reproduce the observed
midwinter minimum in the wave’s seasonal cycle. It therefore remains unclear from this study to what degree the latter is determined by wave transmission properties alone.

Quasi-Stationary Planetary Waves in Total Ozone and their Correlation with Lower Stratospheric Temperature, V. Wirth, PhD thesis, University of Munich

Heispheric maps of monthly total ozone display distinct waves of low zonal wavenumbers during winter. Moreover one observes good correlation of total ozone
with the lower stratospheric temperature. Using eight years of data, the climatological features of these waves and the strength and significance of the correlation are assessed.

A stationary, linear, quasi-geostrophic model with coupled dynamics and ozone photochemistry is used for a more detailed analysis. The results of the model
calculations agree satisfactorily with the observations. It turns out that the impact of photochemistry on the wave dynamics is negligible, and that ozone can be considered as a passive tracer. As far as transport is concerned, both horizontal and vertical advection in the lower stratosphere contribute substantially to the observed deviation from zonal symmetry. An estimation of the impact of nonlinear terms in the ozone continuity equation suggests that linearization is a better approximation in the Soutern Hemisphere than in the Northern Hemisphere.

The question of the total ozone – temperature correlation is examined. It proves useful to think in terms of parcel displacements due to the waves in connection with the quasi-conserved basic state quantities ozone mixing ratio and potential temperature.

Mechanismen des extratropischen Stratosphären-Troposphären-Austauschs. Physikalische Grundlagen und Methoden der Diagnostik bisher wenig beachteter Austauschprozesse auf der synoptischen Skala, V. Wirth, Zusammenfassung für die schriftliche Habilitationsleistung im Sinne von Paragraph 9 Abs. 1 Satz 1 Nr. 1 der Habilitationsordnung der Fakultät für Physik, Ludwig-Maximilians-Universität München (unveröffentlicht).

In der vorliegenden Schrift geht es um Mechanismen des extratropischen Stratosphären-Troposphären-Austauschs auf der synoptischen Skala. Deren detaillierte Kenntnis ist nach heutigem Wissensstand eine wichtige Voraussetzung für das Verständnis der Chemie der untersten Stratosphäre. Das Hauptgewicht liegt hier auf den vom Autor in den vergangenen Jahren untersuchten und vorher weniger beachteten Austauschprozessen. Diese beruhen auf der konvektiven Heizung in der Troposphäre, der Wirkung von Strahlung in der Tropopausenregion und der Ausbildung von kleinen Skalen auf Grund des großskaligen Strömungsfeldes. Mit Hilfe von mechanistischen Modellen wird gezeigt, daß diese (sehr unterschiedlichen) Mechanismen in bestimmen synoptischen Situationen jeweils einen nicht zu vernachlässigenden Massenaustausch bewirken können. Ein weiterer Schwerpunkt liegt in der Untersuchung von Methoden, mit deren Hilfe der synoptischskalige Massenfluß durch die Tropopause aus Daten diagnostisch ermittelt werden kann. Es stellt sich heraus, daß gewisse häufig verwendete Diagnosemethoden zu relativ unzuverlässigen Ergebnissen führen. Die Gründe dafür werden erläutert und bessere, wenn auch aufwendigere Methoden vorgeführt. Eine Fallstudie zum diabatischen Zerfall einer isolierten Höhenzyklone unterstützt die Aussagen des entsprechenden mechanistischen Modells und illustriert die Problematik der Diagnose.

Rossby waves, Jets, Mountain Meteorology, General Circulation

At the University of Mainz I am involved in teaching courses for bachelor, master, and PhD students in Meteorology.
If you are interested in doing Bachelor, Master or PhD research in my group, please do not hesitate to contact me in order to find out current topics of interest.

2025

  • Schmidt, S., Riemer, M., de Heuvel, J., McTaggart-Cowan, R., and Selz, T., 2025: A Feature-Based Framework to Investigate Atmospheric Predictability. Monthly Weather Review, 153 (8). doi: 10.1175/MWR-D-24-0090.1
  • Mayer, A., and Wirth, V., 2025: Two different perspectives on heatwaves within the Lagrangian framework. Weather and Climate Dynamics, 6(1), 131-150. doi: 10.5194/wcd-6-131-2025
  • Jha, R., Wirth, V., Polster, C., Mondal, A., Ghosh, S., 2025: Contrasting Drivers of Consecutive Pre-Monsoon South Asian Heatwaves in 2022: Waveguide Interaction and Soil Moisture Depletion. Journal of Geophysical Research-Atmospheres, 130(7). doi: 10.1029/2024JD042376
  • Harnik, N., and Wirth, V., 2025: Quasi-resonance in a leaky waveguide? Journal of the Atmospheric Sciences, 82,1267–1291. doi: 10.1175/JAS-D-24-0031.1
  • Thomas, M. L, Hoch, S. W., Huwald, H., van Schaik, B. J. A., Lehning, M., Rentel, D. S., Imbert, P., and Wirth, V., 2025: Banner Cloud Formation at the Matterhorn: Measurements versus Large-Eddy Simulations. Journal of the Atmospheric Sciences, 82, 1661–1675. doi: 10.1175/JAS-D-24-0193.1
  • Hoch, S. W., Thomas, M. L., Huwald, H., Lehning, M., van Schaik, B. J. A., Imbert, P., Rentel, D. S., and Wirth, V., 2025: The MatterHEX experiment—Investigating atmospheric flow patterns in highly complex terrain related to banner cloud formation. Bulletin of the American Meteorological Society, 106 (8), E1687–E1702. doi: 10.1175/BAMS-D-24-0108.1

2024

  • Doensen, O., Fragkoulidis, G., Magnusson, L., Riemer, M., Wirth, V., 2024: Medium-range predictability of temperature extremes and biases in Rossby-wave amplitude. Quarterly Journal of the Royal Meteorological Society, 150(765), 5390-5402. doi: 10.1002/qj.4875
  • Segalini, A., Riboldi, J., Wirth, V. and Messori, G., 2024: A linear assessment of barotropic Rossby wave propagation in diXerent background flow configurations. Weather and Climate Dynamics, 5, 997–1012. doi: 10.5194/wcd-5-997-2024

2023

  • Polster, C., and Wirth, V., 2023: A New Atmospheric Background State to Diagnose Local Waveguidability. Geophysical Research Letters, 50, e2023GL106166. doi:10.1029/2023GL106166
  • Rousi, E., et al., 2023: The extremely hot and dry 2018 summer in central and northern Europe from a multi-faceted weather and climate perspective. Natural Hazards and Earth System Sciences, 23, 1699–1718. doi:10.5194/nhess-23-1699-2023
  • Polster, C., and Wirth, V., 2023: The Onset of a Blocking Event as a “Traffic Jam”: Characterization with Ensemble Sensitivity Analysis. Journal of the Atmospheric Sciences, 80, 1681–1699. doi:10.1175/JAS-D-21-0312.1.
  • Teubler, F., Riemer, M., Polster, C., Grams, C. M., Hauser, S., and Wirth, V., 2023: Similarity and variability of blocked weather-regime dynamics in the Atlantic–European region. Weather and Climate Dynamics, 4, 265–285. doi:10.5194/wcd-4-265-2023.
  • Mayer, A. and Wirth, V., 2023: Lagrangian description of the atmospheric flow from Eulerian tracer advection with relaxation. Quarterly Journal of the Royal Meteorological Society, 149 (753), 1271–1292. doi:10.1002/qj.4453
  • Thomas, M. L., and Wirth, V., 2023: Sensitivity of Banner Cloud Formation to Orography and the Ambient Atmosphere: Transition From Idealized to More Realistic Scenarios. Journal of the Atmospheric Sciences, 80, 2653–2668. doi: 10.1175/JAS-D-23-0106.1

2022

  • Prodhomme, C., Materia, S., Ardilouze, C., White, R. H., Batté, L., Guemas, V., Fragkoulidis, G., and García-Serrano, J, 2022: Seasonal prediction of European summer heatwaves. Climate Dynamics, 58, 2149-2166. doi:10.1007/s00382-021-05828-3

2021

  • White, R., Kornhuber, K., Martius, O., and Wirth, V., 2021. From Atmospheric Waves to Heatwaves: A Waveguide Perspective for Understanding and Predicting Concurrent, Persistent and Extreme Extratropical Weather. Bulletin of the American Meteorological Society, 103 (3), E923–E935. doi: 10.1175/BAMS-D-21-0170.1
  • Craig, G. C., Fink, A. H. , Hoose, C., Janjic, T., Knippertz, P., Laurian, A., Lerch, S., Mayer, B., Miltenberger, A., Riemer, M., Tempest, K. , and Wirth, V., 2021. Waves to weather: Exploring the limits of predictability of weather. Bulletin of the American Meteorological Society, 102:E2151–E2164, doi: 10.1175/BAMS-D-20-0035.1
  • Wirth, V. and Polster, C., 2021: The Problem of Diagnosing Jet Waveguidability in the Presence of Large-Amplitude Eddies. Journal of the Atmospheric Sciences, 78(10), 3137-3151. doi:10.1175/JAS-D-20-0292.1
  • Grazzini, F., Fragkoulidis, G., Teubler, F., Wirth, V. and Craig, G. C., 2021, Extreme precipitation events over northern Italy. Part II: Dynamical precursors. Quarterly Journal of the Royal Meteorological Society, 147(735), 1237-1257. doi:10.1002/qj.3969

2020

  • Fragkoulidis, G. and Wirth, V., 2020: Local Rossby wave packet amplitude, phase speed, and group velocity: Seasonal variability and their role in temperature extremes. Journal of Climate, 33(20), 8767-8787. doi: 10.1175/JCLI-D-19-0377.1
  • Wirth, V., 2020: Waveguidability of idealized midlatitude jets and the limitations of ray tracing theory. Weather and Climate Dynamics, 1, 111–125. doi: 10.5194/wcd-1-111-2020
  • Wirth, V., Bubel, P., Eichhorn, J., Schömer, E., Kremer, T., Erbes, R., Schappert, S., and Prestel, I., 2020: The role of wind speed and wind shear for banner cloud formation. Journal of the Atmospheric Sciences, 77 (4), 1199–1212. doi: 10.1175/JAS-D-18-0354.1

2019

  • Ghinassi, P., Baumgart, M., Teubler, F., Riemer, M., and Wirth, V., 2019: A budget equation for the amplitude of Rossby wave packets based on finite amplitude local wave activity. Journal of the Atmospheric Sciences, 77 (1), 277–296. doi: 10.1175/JAS-D-19-0149.1
  • Baumgart, M., Ghinassi, P. , Wirth, V., Selz, T., Craig, G., and Riemer, M., 2019: Quantitative view on the processes governing the upscale error growth up to the planetary scale using a stochastic convection scheme. Monthly Weather Review, 147, 1713–1731. doi: 10.1175/MWRD180292.1

2018

  • Ghinassi, P., Fragkoulidis, G., and Wirth, V., 2018: Local finite-amplitude wave activity as a diagnostic for Rossby wave packets. Monthly Weather Review, 146(12), 4099-4114, doi:10.1175/MWR-D-18-0068.1
  • Zschenderlein, P., Fragkoulidis, G., Fink, A. H., and Wirth, V., 2018: Large-scale Rossby wave and synoptic-scale dynamic analyses of the unusually late 2016 heatwave over Europe. Weather, 73, 275-283, doi:10.1002/wea.3278
  • Wirth, V., M. Riemer, E. K. M. Chang, and O. Martius, 2018: Rossby Wave Packets on the Midlatitude Waveguide – A Review. Mon. Wea. Rev., 146(7), 1965–2001, doi:10.1175/MWR-D-16-0483.1
  • Baumgart, M., M. Riemer, V. Wirth, F. Teubler, and S. T. K. Lang, 2018: Potentialvorticity dynamics of forecast errors: A quantitative case study. Mon. Wea. Rev., 145, 1405–1425, DOI:10.1175/MWR-D-17-0196.1.[Link to online version.]
  • Fragkoulidis, G., Wirth, V., Bossmann, P., and Fink, A. H., 2018: Linking Northern Hemisphere temperature extremes to Rossby wave packets. Quarterly Journal of the Royal Meteorological Society, 144: 553-566, doi:10.1002/qj.3228

2017

  • Wolf, G., and V. Wirth, 2017: Diagnosing the horizontal propagation of Rossby wave packets along the midlatitude waveguide. Mon. Wea. Rev., 145, 3247-3264. [Link to online version.]

2016

  • Wirth, V., 2016: Orographische Bannerwolken: Systematische Untersuchungen zu einem faszinierenden Naturphänomen. PROMET, 98, 95-101.
  • Simmer, C., and collaborators, 2016: HErZ: German Hans-Ertel centre for weather research. Bull. Am. Meteorol. Soc., 1057–1068. [Link to online version.]
  • Prestel, I., and V. Wirth, 2016: What flow conditions are conducive to banner cloud formation? J. Atmos. Sci., 73, 2385-2402. [Link to online version.]

2015

  • Schappert, S., and V. Wirth, 2015: Origin and Flow History of Air Parcels in Orographic Banner Clouds. J. Atmos. Sci., 72, 3389-3403. [Link to online version.]
  • Frueh, B., V. Wirth, J. Egger, A. Pfeiffer, and J. W. Schipper, 2015. In: Regional Assessment of Global Change Impacts: The GLOWA-Danube Projekt. Chapter on Precipitation and Temperature. DOI:10.1007/978-3-319-16751-9-32, Springer International Publishing Switzerland.
  • Rendon, A. M., V. Wirth, J. F. Salazar, and C. A. Palacio, 2015: Temperatur inversion breakup with impacts on air quality in urban valleys influence by topographic shading. J. Appl. Meteor. Climatol., 54, 392-321. [Link to online version.]
  • Wolf, G., and V. Wirth, 2015: Implications of the semigeostrophic nature of Rossby waves for Rossby wave packet detection. Mon. Wea. Rev., 143, 26-38. [Link to online version.]

2014

  • Kunkel, D., P. Hoor, and V. Wirth, 2014: Can inertia-gravity waves persistently alter the tropopause inversion layer? Geophys. Res. Lett., 41, 7822-7829, doi:10.1002/2014GL061970.
  • Broetz, B., R. Eigenmann, A. Doernbrack, T. Foken, and V. Wirth 2014. Early-morning flow transition in a valley in low-mountain terrain under clear-sky conditions. Boundary Layer Meteorology, 152, 45–63, DOI 10.1007/s10546-014-9921-7. [Link to online version.]
  • Yelash, L., A. Mueller, M. Lukacova-Medvidova, F. X. Giraldo, and V. Wirth 2014: Adaptive discontinuous evolution Galerkin method for dry atmospheric flow. J. Computational Physics, 268, 106-133, doi:10.1016/j.jcp.2014.02.034. [Link to online version.]
  • Rendon, A. M., J. F. Salazar, C. A. Palacio, V. Wirth and B. Broetz, 2014: Effects of Urbanization on the Temperature Inversion Breakup in a Mountain Valley with Implications for Air Quality. J. Appl. Meteor. Climatol., 53, 840-858. [Link to online version.]
  • Wirth, V., and J. Eichhorn, 2014: Long-lived Rossby wave trains as precursors to strong winter cyclones over Europe. Quart. J. Roy. Met. Soc., 140, 729-737. [Link to online version.]
  • Glatt, I., and V. Wirth, 2014: Identifying Rossby wave trains and quantifying their properties. Quart. J. Roy. Met. Soc., 140, 384-396. [Link to online version.]

2013

  • Voigt, M., and V. Wirth, 2013: Mechanisms of Banner Cloud Formation. J. Atmos. Sci., 70, 3631-3640. [Link to online version.]
  • Mueller, A., F. X. Giraldo, and V. Wirth, 2013: Comparison between adaptive and uniform discontinuous Galerkin simulations in dry 2D bubble experiments. J. Comput. Phys., 235, 371-393. [Link to online version.]
  • Blackburn, M., and collaborators, 2013: The Aqua-Planet Experiment (APE): CONTROL SST simulation. J. Meteor. Soc. Japan, 91A, 17-56. DOI:10.2151/jmsj.2013-A02.
  • Williamson, D. L., and collaborators, 2013: The Aqua-Planet Experiment (APE): Response to changed meridional SST profile. J. Meteor. Soc. Japan, 91A, 57-89. DOI:10.2151/jmsj.2013-A03.

2012

  • Williamson, D. L., and collaborators, 2012: The APE Atlas. NCAR Techniacl Note, NCAR/TN-484+STR. [Available online.]
  • Wirth, V., M. Kristen, M. Leschner, J. Reuder, and J. H. Schween, 2012: Banner clouds observed at Mount Zugspitze. Atmos. Chem. Phys., 12, 3611-3625. [Available online.]

2011

  • Glatt, I., A. Dörnbrack, S. Jones, J. Keller, O. Martius, A. Müller, D. H. W. Peters, and V. Wirth, 2011: Utility of Hovmöller diagrams to diagnose Rossby wave trains. Tellus, 63A, 991-1006.
  • Erler, A., and V. Wirth, 2011: The Static Stability of the Tropopause Region in Adiabatic Baroclinic Life Cycle Experiments. J. Atmos. Sci., 68 1178-1193.

2009

  • Reinert, D., and V. Wirth, 2009: A New Large-Eddy Simulation Model for Simulating Air Flow and Warm Clouds Above Highly Complex Terrain. Part II: The Moist Model and its Application to Banner Clouds. Boundary-Layer Meteorology, 133 113-136.
  • Wirth, V., and T. J. Dunkerton, 2009: The Dynamics of Eye Formation and Maintenance in Axisymmetric Diabatic Vortices. J. Atmos. Sci, 66, 3601-3620.
  • Müller, A., and V. Wirth, 2009: Resolution dependence of the tropopause inversion layer in an idealized model for upper tropospheric anticyclones. J. Atmos. Sci, 66, 3491-3497.

2008

  • Reinert, D., and V. Wirth, 2008: The Origin and Dynamics of Banner Clouds: An Analysis Based on Large Eddy Simulations. Proceedings of the 13th Conference of Mountain Meteorology, 11-15 August 2008, Whistler, Canada, 10B4. [reprint]

2007

  • Reinert, D., J. Eichhorn, W.-G. Panhans, and V. Wirth, 2007: A new LES model for simulating air flow and warm clouds above highly complex terrain. Part I: The dry model. Boundary Layer Meteorology, 125, 109-132, doi: 10.1007/s10,546-007-9183-8.
  • Frueh, B., and V. Wirth, 2007: Convective Available Potential Energy (CAPE) in mixed phase cloud conditions. Q. J. R. Meteorol. Soc., 133, 561-569 .
  • Schween, J., J. Kuettner, D. Reinert, J. Reuder, and V. Wirth, 2007: Definition of ‘banner clouds’ based on time lapse movies. Atmos. Chem. Phys., 7, 2047-2055. [Available online.]
  • Wirth, V., and T. Szabo, 2007: Sharpness of the extratropical tropopause in baroclinic life cycle experiments. Geophys. Res. Lett., 34, L02809, doi:10.1029/2006GL028369.

2006

  • Früh, B., J. W. Schipper, A. Pfeiffer, and V. Wirth, 2006: A pragmatic approach for downscaling precipitation in alpine-scale complex terrain. Met. Z. (N.F.), 15, 631-646.
  • Wirth, V., and T. J. Dunkerton, 2006: A unified perspective on the dynamics of axisymmetric hurricanes and monsoons. J. Amos. Sci, 63, 2529-2547. [preprint]
  • Engel, A., and collaborators, 2006: Highly resolved observations of trace gases in the lowermost stratosphere and upper troposphere from the SPURT project: an overview. ACP, 6, 283-301. [Available online.]

2005

  • Hegglin, M. I., D. Brunner, Th. Peter, J. Staehelin, V. Wirth, P. Hoor and H. Fischer, 2005: Determination of turbulent diffusivity in the lowermost stratosphere. Geophys. Res. Lett, 32 L13812, doi:10.1029/2005GL022495.
  • Wirth, V., H. Borth, J.-F. Lopez, W.-G. Panhans, M. Riemer and T. Szabo, 2005: Dynamics in the Extratropical Tropopause Region: a Case of Transition Between Dynamically Active and Passive Tracer Advection? Q. J. Roy. Met. Soc., 131, 247-258. [preprint]

2004

  • Engel, A., et al., 2004: Trace gas transport in the tropopause region (SPURT). AFO 2000 Newsletter, 9, 11-14
  • Wirth, V., 2004: Sommerlich Wetterextreme: Zufall oder Zeichen? Forschungsmagazin der Johannes Guternberg-Universität Mainz, 20, 46-51
  • Hoor, P., et al., 2004: New insights into upward transport across the extratropical tropopause derived from extensive in-situ measurements during the SPURT project. SPARC Newsletter, 22, 29-31
  • Wirth, V., 2004: A Dynamical Mechanism for Tropopause Sharpening. Met. Zeitschrift, 13 , 477-484. [preprint]

2003

  • Wirth, V., 2003: Static Stability in the Extratropical Tropopause Region. J. Atmos. Sci., 60, 1395-1409. [preprint]
  • Stohl, A., et al., 2003: Stratosphere-troposphere exchange: A review, and what we have learned from STACCATO. J. Geophys. Res., 108, doi:10.1029/2002JD002490

2002

  • Zängl, G., and V. Wirth, 2002: Synoptic-scale variability of the polar and subpolar tropopause: Data analysis and idealized PV inversions. Q. J. R. Meteorol. Soc., 128, 2301-2315. [preprint]

2001

  • Wirth, V., 2001: Detection of Hidden Regimes in Stochastic Cyclostationary Time Series. Phys. Rev. E, 64, 016136(6). [preprint]
  • Hauck, Ch., and V. Wirth, 2001: Diagnosing the impact of stratospheric planetary wave breaking in a linear model. J. Atmos. Sci., 58, 1357-1370.
  • Wirth, V., 2001: Cyclone-Anticyclone Asymmetry Concerning the Height of the Thermal and the Dynamical Tropopause. J. Atmos. Sci., 58, 26-37. [preprint]
  • Zängl, G., J. Egger, and V. Wirth, 2001: Diurnal winds in the Himalayan Kali Gandaki valley. Part II: modelling. Mon. Wea. Rev., 129, 1062-1080.

2000

  • Forster, C., and V. Wirth, 2000: Radiative decay of idealized stratospheric filaments in the troposphere. J. Geophys. Res., 105, 10,169-10,184.
  • Wirth, V., 2000: Thermal versus dynamical tropopause in upper tropospheric balanced flow anomalies. Quart. J. Roy. Met. Soc., 126, 299-317.
  • Egger, J., et al., 2000: Diurnal winds in the Himalayan Kali Gandaki valley. Part I: observations. Mon. Wea. Rev., 128, 1106-1122.