Middle atmosphere localized gravity wave forcing: Formation, impact and long-term evolution
Final Report Abstract
The MATELO-FILE project, a cooperation of Universität Leipzig, Institute for Meteorology, Leipzig, Germany and the Department of Atmospheric Physics, Charles University in Prague, Czech Republic, included the detection and modeling of gravity waves and their local hotspots. This in particular included their effect on the dynamics of the middle atmosphere. In addition to analysing existing climate model data, we performed UA-ICON model experiments with part of the gravity wave excluded. Our results confirm the compensation mechanism in the UA-ICON model, whereby the perturbed forcings in the gravity wave parameterization drag are often cancelled or compensated by a resolved large-scale wave driving of opposite sign. This also has effect on the mesosphere after sudden stratospheric warmings: when the non-orographic gravity-wave drag is absent, the anomalously enhanced resolved wave forcing in the mesosphere gives rise to the formation of elevated stratopause events at about 85 km. The changes in the residual circulation particularly due to the gravity wave contributions are also important in explaining the changes in the teleconnection of equatorial and high-latitude stratosphere (the so-called Holton-Tan-Mechanism), which weakens in a warmer climate.
Publications
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Response of the resolved planetary wave activity and amplitude to turned off gravity waves in the UA-ICON general circulation model. Journal of Atmospheric and Solar-Terrestrial Physics, 241, 105967.
Karami, Khalil; Mehrdad, Sina & Jacobi, Christoph
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Parameterized orographic gravity wave drag and dynamical effects in CMIP6 models. Climate Dynamics, 62(3), 2259-2284.
Hájková, Dominika & Šácha, Petr
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Sensitivity of Mountain Wave Drag Estimates on Separation Methods and Proposed Improvements. Journal of the Atmospheric Sciences, 80(7), 1661-1680.
Procházková, Zuzana; Kruse, Christopher G.; Alexander, M. Joan; Hoffmann, Lars; Bacmeister, Julio T.; Holt, Laura; Wright, Corwin; Sato, Kaoru; Gisinger, Sonja; Ern, Manfred; Geldenhuys, Markus; Preusse, Peter & Šácha, Petr
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The Climatology of Elevated Stratopause Events in the UA‐ICON Model and the Contribution of Gravity Waves. Journal of Geophysical Research: Atmospheres, 128(7).
Karami, Khalil; Borchert, Sebastian; Eichinger, Roland; Jacobi, Christoph; Kuchar, Ales; Mehrdad, Sina; Pisoft, Petr & Sacha, Petr
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The Holton–Tan mechanism under stratospheric aerosol intervention. Atmospheric Chemistry and Physics, 23(6), 3799-3818.
Karami, Khalil; Garcia, Rolando; Jacobi, Christoph; Richter, Jadwiga H. & Tilmes, Simone
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Upper Atmosphere ICON model Time Slice experiment under 1985 repeated 30 years R2B4 resolution control run
Karami, K. & C. Jacobi
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Upper Atmosphere ICON model Time Slice experiment under 1985 repeated 30 years R2B4 resolution no nonorographic scale orographic gravity waves run
Karami, K. & C. Jacobi
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Upper Atmosphere ICON model Time Slice experiment under 1985 repeated 30 years R2B4 resolution no subgrid scale orographic gravity waves run
Karami, K. & C. Jacobi
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Arctic climate response to European radiative forcing: a deep learning study on circulation pattern changes. Weather and Climate Dynamics, 5(4), 1223-1268.
Mehrdad, Sina; Handorf, Dörthe; Höschel, Ines; Karami, Khalil; Quaas, Johannes; Dipu, Sudhakar & Jacobi, Christoph
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Climatology and trends of mesosphere/lower thermosphere gravity aves derived from combined LF spaced receiver and VHF Doppler wind observations at Collm. Rep. Inst. Meteorol. Univ. Leipzig, 62, 1 –12
Jacobi, C. & K. Karami
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Gravity waves generated by the Hunga Tonga–Hunga Ha′apai volcanic eruption and their global propagation in the mesosphere/lower thermosphere observed by meteor radars and modeled with the High-Altitude general Mechanistic Circulation Model. Atmospheric Chemistry and Physics, 24(8), 4851-4873.
Stober, Gunter; Vadas, Sharon L.; Becker, Erich; Liu, Alan; Kozlovsky, Alexander; Janches, Diego; Qiao, Zishun; Krochin, Witali; Shi, Guochun; Yi, Wen; Zeng, Jie; Brown, Peter; Vida, Denis; Hindley, Neil; Jacobi, Christoph; Murphy, Damian; Buriti, Ricardo; Andrioli, Vania; Batista, Paulo ... & Li, Na
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Long-term changes of mesosphere/lower thermosphere gravity waves over Collm, Germany. 2024 Kleinheubach Conference, 1-4. IEEE.
Jacobi, Christoph; Karami, Khalil; Kuchar, Ales; Renkwitz, Toralf; Latteck, Ralph & Chau, Jorge L.
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Mesosphere and Lower Thermosphere Wind Perturbations Due To the 2022 Hunga Tonga‐Hunga Ha'apai Eruption as Observed by Multistatic Specular Meteor Radars. Radio Science, 59(8).
Chau, Jorge L.; Poblet, Facundo L.; Liu, Hanli; Liu, Alan; Gulbrandsen, Njål; Jacobi, Christoph; Rodriguez, Rodolfo R.; Scipion, Danny & Tsutsumi, Masaki
