Articles | Volume 26, issue 19
https://doi.org/10.5194/acp-26-13845-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-13845-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
The impact of orography on the troposphere-to-stratosphere transport during a typhoon event in the tropics
Massimo Martina
CORRESPONDING AUTHOR
Department of Atmospheric Physics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
Anahí Villalba-Pradas
Department of Atmospheric Physics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
Šimon Bartoň
Department of Atmospheric Physics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
Department of Atmospheric Physics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
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EGUsphere, https://doi.org/10.5194/egusphere-2026-5319, https://doi.org/10.5194/egusphere-2026-5319, 2026
This preprint is open for discussion and under review for Weather and Climate Dynamics (WCD).
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Stratospheric polar vortex is one the most important parts of the winter stratospheric circulation. Its stability is hard to simulate and differs between general circulation models. Here, we show how the intermodel differences of parameterized orographic gravity wave drag influence propagation and breaking of resolved planetary waves; and consequently how it is connected to vortex stability. For this we use the geometry of polar vortex, potential vorticity as well as northern annular mode index.
Beth Dingley, James A. Anstey, Marta Abalos, Carsten Abraham, Tommi Bergman, Lisa Bock, Sonya Fiddes, Birgit Hassler, Ryan J. Kramer, Fei Luo, Fiona M. O'Connor, Petr Šácha, Isla R. Simpson, Laura J. Wilcox, and Mark D. Zelinka
Geosci. Model Dev., 19, 2945–2984, https://doi.org/10.5194/gmd-19-2945-2026, https://doi.org/10.5194/gmd-19-2945-2026, 2026
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This manuscript defines as a list of variables and scientific opportunities which are requested from the Coupled Model Intercomparison Project Phase 7 (CMIP7) Assessment Fast Track to address open atmospheric science questions. The list reflects the output of a large public community engagement effort, coordinated across autumn 2025 through to summer 2025.
Radek Zajíček, Zuzana Procházková, and Petr Šácha
EGUsphere, https://doi.org/10.5194/egusphere-2026-909, https://doi.org/10.5194/egusphere-2026-909, 2026
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We compare resolved gravity wave drag from high-resolution reanalysis data with parameterized drag from global climate model simulations. Our results show strong similarity between parameterized and resolved drag, but their interactions with Rossby waves differ markedly. This discrepancy suggests that current climate models may misrepresent gravity wave influences on atmospheric circulation and highlight the need to improve gravity wave parameterizations for more reliable climate predictions.
Zuzana Procházková, Radek Zajíček, and Petr Šácha
Weather Clim. Dynam., 6, 927–947, https://doi.org/10.5194/wcd-6-927-2025, https://doi.org/10.5194/wcd-6-927-2025, 2025
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In this work, we compute and analyze resolved gravity wave drag in high-resolution reanalysis data. Studying gravity waves with a realistic dataset helps us to understand them better and potentially improve climate projections. Part of our results supports a key hypothesis governing the vertical distribution of parameterized gravity wave drag in climate models; however, we also provide evidence of the strong influence of horizontal wave propagation, a mechanism that is currently missing in the models.
Masatomo Fujiwara, Patrick Martineau, Jonathon S. Wright, Marta Abalos, Petr Šácha, Yoshio Kawatani, Sean M. Davis, Thomas Birner, and Beatriz M. Monge-Sanz
Atmos. Chem. Phys., 24, 7873–7898, https://doi.org/10.5194/acp-24-7873-2024, https://doi.org/10.5194/acp-24-7873-2024, 2024
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A climatology of the major variables and terms of the transformed Eulerian-mean (TEM) momentum and thermodynamic equations from four global atmospheric reanalyses is evaluated. The spread among reanalysis TEM momentum balance terms is around 10 % in Northern Hemisphere winter and up to 50 % in Southern Hemisphere winter. The largest uncertainties in the thermodynamic equation (about 50 %) are in the vertical advection, which does not show a structure consistent with the differences in heating.
Peter Huszar, Alvaro Patricio Prieto Perez, Lukáš Bartík, Jan Karlický, and Anahi Villalba-Pradas
Atmos. Chem. Phys., 24, 397–425, https://doi.org/10.5194/acp-24-397-2024, https://doi.org/10.5194/acp-24-397-2024, 2024
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Urbanization transforms rural land into artificial land, while due to human activities, it also introduces a great quantity of emissions. We quantify the impact of urbanization on the final particulate matter pollutant levels by looking not only at these emissions, but also at the way urban land cover influences meteorological conditions, how the removal of pollutants changes due to urban land cover, and how biogenic emissions from vegetation change due to less vegetation in urban areas.
Anahí Villalba-Pradas and Francisco J. Tapiador
Geosci. Model Dev., 15, 3447–3518, https://doi.org/10.5194/gmd-15-3447-2022, https://doi.org/10.5194/gmd-15-3447-2022, 2022
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The paper provides a comprehensive review of the empirical values and assumptions used in the convection schemes of numerical models. The focus is on the values and assumptions used in the activation of convection (trigger), the transport and microphysics (commonly referred to as the cloud model), and the intensity of convection (closure). Such information can assist satellite missions focused on elucidating convective processes and the evaluation of model output uncertainties.
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Short summary
Our work presents a previously undocumented mechanism for stratosphere-troposphere exchange, which is triggered by the interaction of typhoons with the underlying orography. This interaction induces the rapid and efficient transport of emissions from the boundary layer to the tropical tropopause and stratosphere. Our study has significant implications for the development of climate models in terms of parameterization schemes and for our understanding of pollution transport in tropical regions.
Our work presents a previously undocumented mechanism for stratosphere-troposphere exchange,...
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