Articles | Volume 4, issue 2
https://doi.org/10.5194/wcd-4-265-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wcd-4-265-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
04 Apr 2023
Research article |
| 04 Apr 2023
| 04 Apr 2023
Similarity and variability of blocked weather-regime dynamics in the Atlantic–European region
Institute for Atmospheric Physics, Johannes Gutenberg-University Mainz, Mainz, Germany
Michael Riemer
Institute for Atmospheric Physics, Johannes Gutenberg-University Mainz, Mainz, Germany
Christopher Polster
Institute for Atmospheric Physics, Johannes Gutenberg-University Mainz, Mainz, Germany
Christian M. Grams
Institute of Meteorology and Climate Research (IMK-TRO), Department Troposphere Research, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
Seraphine Hauser
Institute of Meteorology and Climate Research (IMK-TRO), Department Troposphere Research, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
Volkmar Wirth
Institute for Atmospheric Physics, Johannes Gutenberg-University Mainz, Mainz, Germany
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Research in the last few decades has revealed that rapidly ascending airstreams in extratropical cyclones have an important effect on the evolution of downstream weather and predictability. In this study, we show that the occurrence of these airstreams over the North Pacific is modulated by tropical convection. Depending on the modulation, known atmospheric circulation patterns evolve quite differently, which may affect extended-range predictions in the Atlantic–European region.
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Christoph Fischer, Andreas H. Fink, Elmar Schömer, Roderick van der Linden, Michael Maier-Gerber, Marc Rautenhaus, and Michael Riemer
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Edgar Dolores-Tesillos, Franziska Teubler, and Stephan Pfahl
Weather Clim. Dynam., 3, 429–448, https://doi.org/10.5194/wcd-3-429-2022, https://doi.org/10.5194/wcd-3-429-2022, 2022
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Julian F. Quinting and Christian M. Grams
Geosci. Model Dev., 15, 715–730, https://doi.org/10.5194/gmd-15-715-2022, https://doi.org/10.5194/gmd-15-715-2022, 2022
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Physical processes in weather systems importantly affect the midlatitude large-scale circulation. This study introduces an artificial-intelligence-based framework which allows the identification of an important weather system – the so-called warm conveyor belt (WCB) – at comparably low computational costs and from data at low spatial and temporal resolution. The framework thus newly enables the systematic investigation of WCBs in large data sets such as climate model projections.
Julian F. Quinting, Christian M. Grams, Annika Oertel, and Moritz Pickl
Geosci. Model Dev., 15, 731–744, https://doi.org/10.5194/gmd-15-731-2022, https://doi.org/10.5194/gmd-15-731-2022, 2022
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This study applies novel artificial-intelligence-based models that allow the identification of one specific weather system which affects the midlatitude circulation. We show that the models yield similar results as their trajectory-based counterpart, which requires data at higher spatiotemporal resolution and is computationally more expensive. Overall, we aim to show how deep learning methods can be used efficiently to support process understanding of biases in weather prediction models.
Franziska Teubler and Michael Riemer
Weather Clim. Dynam., 2, 535–559, https://doi.org/10.5194/wcd-2-535-2021, https://doi.org/10.5194/wcd-2-535-2021, 2021
Short summary
Short summary
Rossby wave packets impact all aspects of midlatitude weather systems, from their climatological distribution to predictability. Case studies suggest an important role of latent heat release in clouds. We investigate thousands of wave packets with a novel diagnostic. We demonstrate that, on average, the impact of moist processes is substantially different between troughs and ridges and that dry conceptual models of wave packet dynamics should be extended.
Emmanouil Flaounas, Suzanne L. Gray, and Franziska Teubler
Weather Clim. Dynam., 2, 255–279, https://doi.org/10.5194/wcd-2-255-2021, https://doi.org/10.5194/wcd-2-255-2021, 2021
Short summary
Short summary
In this study, we quantify the relative contribution of different atmospheric processes to the development of 100 intense Mediterranean cyclones and show that both upper tropospheric systems and diabatic processes contribute to cyclone development. However, these contributions are complex and present high variability among the cases. For this reason, we analyse several exemplary cases in more detail, including 10 systems that have been identified in the past as tropical-like cyclones.
Cited articles
Baumgart, M., Riemer, M., Wirth, V., Teubler, F., and Lang, S. T. K.: Potential Vorticity Dynamics of Forecast Errors: A Quantitative Case Study,
Mon. Weather Rev., 146, 1405–1425, https://doi.org/10.1175/MWR-D-17-0196.1, 2018. a
Benedict, J. J., Lee, S., and Feldstein, S. B.: Synoptic View of the North Atlantic Oscillation, J. Atmos. Sci., 61, 121–144, https://doi.org/10.1175/1520-0469(2004)061<0121:SVOTNA>2.0.CO;2, 2004. a, b, c
Bishop, C. M.: Pattern Recognition and Machine Learning, in: vol. 4, Springer, New York, ISBN 78-1493938438, 2006. a
Buizza, R. and Leutbecher, M.: The Forecast Skill Horizon, Q. J. Roy. Meteorol. Soc., 141, 3366–3382, https://doi.org/10.1002/qj.2619, 2015. a
Caliński, T. and Harabasz, J.: A dendrite method for cluster analysis,
Commun. Stat.-Theor. Meth., 3, 1–27, 1974. a
Cassou, C.: Intraseasonal Interaction between the Madden–Julian Oscillation and the North Atlantic Oscillation, Nature, 455, 523–527, https://doi.org/10.1038/nature07286, 2008. a, b
Cassou, C., Terray, L., and Phillips, A. S.: Tropical Atlantic Influence on
European Heat Waves, J. Climate, 18, 2805–2811, https://doi.org/10.1175/JCLI3506.1, 2005. a
Chagnon, J. M., Gray, S. L., and Methven, J.: Diabatic Processes Modifying
Potential Vorticity in a North Atlantic Cyclone, Q. J. Roy. Meteorol. Soc., 139, 1270–1282, 2013. a
Charney, J. G.: The Dynamics of Long Waves In A Baroclinic Westerly Current, J. Meteorol., 4, 135–162, 1947. a
Craig, G. C., Fink, A. H., Hoose, C., Janjić, T., Knippertz, P., Laurian,
A., Lerch, S., Mayer, B., Miltenberger, A., Redl, R., Riemer, M., Tempest, K. I., and Wirth, V.: Waves to Weather: Exploring the Limits of Predictability of Weather, B. Am. Meteorol. Soc., 102, E2151–E2164, https://doi.org/10.1175/BAMS-D-20-0035.1, 2021. a
Davini, P. and d'Andrea, F.: From CMIP3 to CMIP6: Northern Hemisphere
atmospheric blocking simulation in present and future climate, J. Climate, 33, 10021–10038, 2020. a
Davis, C. A.: Piecewise Potential Vorticity Inversion, J. Atmos. Sci., 49, 1397–1411, https://doi.org/10.1175/1520-0469(1992)049<1397:PPVI>2.0.CO;2, 1992. a
Davis, C. A. and Emanuel, K. A.: Potential Vorticity Diagnostics of
Cyclogenesis, Mon. Weather Rev., 119, 1929–1953, https://doi.org/10.1175/1520-0493(1991)119<1929:PVDOC>2.0.CO;2, 1991. a
Davis, C. A., Stoelinga, M. T., and Kuo, Y.-H.: The Integrated Effect of
Condensation In Numerical Simulations of Extratropical Cyclogenesis, Mon. Weather Rev., 121, 2309–2330,
https://doi.org/10.1175/1520-0493(1993)121<2309:TIEOCI>2.0.CO;2, 1993. a, b
Drouard, M. and Woollings, T. J.: Contrasting Mechanisms of Summer Blocking Over Western Eurasia, Geophys. Res. Lett., 45, 12040–12048, https://doi.org/10.1029/2018GL079894, 2018. a, b
Drouard, M., Woollings, T., Sexton, D. M. H., and McSweeney, C. F.: Dynamical
Differences Between Short and Long Blocks in the Northern Hemisphere, J. Geophys. Res.-Atmos., 126, e2020JD034082, https://doi.org/10.1029/2020JD034082, 2021. a
Duchon, C. E.: Lanczos Filtering in One and Two Dimensions, J. Appl. Meteorol. Clim., 18, 1016–1022, https://doi.org/10.1175/1520-0450(1979)018<1016:LFIOAT>2.0.CO;2, 1979. a
Ertel, H.: Ein Neuer Hydrodynamischer Erhaltungssatz, Naturwissenschaften, 30, 543–544, https://doi.org/10.1007/BF01475602, 1942. a
Evans, K. J. and Black, R. X.: Piecewise Tendency Diagnosis of Weather Regime Transitions, J. Atmos. Sci., 60, 1941–1959,
https://doi.org/10.1175/1520-0469(2003)060<1941:ptdowr>2.0.co;2, 2003. a, b
Feldstein, S. B.: Fundamental Mechanisms of the Growth and Decay of the PNA
Teleconnection Pattern, Q. J. Roy. Meteorol. Soc., 128, 775–796, https://doi.org/10.1256/0035900021643683, 2002. a, b, c, d
Ferranti, L., Magnusson, L., Vitart, F., and Richardson, D. S.: How far in
advance can we predict changes in large-scale flow leading to severe cold
conditions over Europe?, Q. J. Roy. Meteorol. Soc., 144, 1788–1802, 2018. a
Ghinassi, P., Fragkoulidis, G., and Wirth, V.: Local Finite-Amplitude Wave
Activity as a Diagnostic for Rossby Wave Packets, Mon. Weather Rev., 146, 4099–4114, https://doi.org/10.1175/MWR-D-18-0068.1, 2018. a, b
Ghinassi, P., Baumgart, M., Teubler, F., Riemer, M., and Wirth, V.: A Budget
Equation for the Amplitude of Rossby Wave Packets Based on Finite-Amplitude Local Wave Activity, J. Atmos. Sci., 77, 277–296, https://doi.org/10.1175/JAS-D-19-0149.1, 2020. a, b
Grams, C. M., Magnusson, L., and Madonna, E.: An Atmospheric Dynamics
Perspective on the Amplification and Propagation of Forecast Error in Numerical Weather Prediction Models: A Case Study, Q. J. Roy. Meteoro. Soc., 144, 2577–2591, https://doi.org/10.1002/qj.3353, 2018. a, b
Hannachi, A., Straus, D. M., Franzke, C. L., Corti, S., and Woollings, T. J.:
Low-Frequency Nonlinearity and Regime Behavior in the Northern Hemisphere
Extratropical Atmosphere, Rev. Geophys., 55, 199–234, https://doi.org/10.1002/2015RG000509, 2017. a
Hauser, S., Knippertz, P., Quinting, J. F., Riemer, M., Teubler, F., and Grams, C. M.: A process-based understanding of Greenland Blocking regime life cycle dynamics in ERA-5 reanalysis from a potential vorticity perspective, in: EMS Annual Meeting 2022, Bonn, Germany, 5–9 September 2022, EMS2022-120, https://doi.org/10.5194/ems2022-120, 2022a. a, b
Hauser, S., Teubler, F., Riemer, M., Knippertz, P., and Grams, C. M.: Towards a diagnostic framework unifying different perspectives on blocking dynamics: insight into a major blocking in the North Atlantic-European region, Weather Clim. Dynam. Discuss. [preprint], https://doi.org/10.5194/wcd-2022-44, in review, 2022b. a, b, c, d, e, f, g, h, i, j, k, l
Hersbach, H., Bell, W., Berrisford, P., Horányi, A., Muñoz-Sabater, J., Nicolas, J., Radu, R., Schepers, D., Simmons, A., Soci, C., and Dee, D.: Global Reanalysis: Goodbye ERA-Interim, Hello ERA5, ECMWF Newslett., 159,
17–24, https://doi.org/10.21957/vf291hehd7, 2019. a
Hersbach, H., Bell, B., Berrisford, P., Hirahara, S., Horányi, A.,
Muñoz-Sabater, J., Nicolas, J., Peubey, C., Radu, R., Schepers, D.,
Simmons, A., Soci, C., Abdalla, S., Abellan, X., Balsamo, G., Bechtold, P., Biavati, G., Bidlot, J., Bonavita, M., De Chiara, G., Dahlgren, P., Dee, D., Diamantakis, M., Dragani, R., Flemming, J., Forbes, R., Fuentes, M., Geer, A., Haimberger, L., Healy, S., Hogan, R. J., Hólm, E., Janisková, M., Keeley, S., Laloyaux, P., Lopez, P., Lupu, C., Radnoti, G., de Rosnay, P., Rozum, I., Vamborg, F., Villaume, S., and Thépaut, J.-N.: The ERA5 global reanalysis, Q. J. Roy. Meteorol. Soc., 146, 1999–2049, 2020. a
Hochman, A., Messori, G., Quinting, J. F., Pinto, J. G., and Grams, C. M.: Do
Atlantic-European Weather Regimes Physically Exist?, Geophys. Res. Lett., 48, e2021GL095574, https://doi.org/10.1029/2021GL095574, 2021. a, b
Hoskins, B. J., McIntyre, M. E., and Robertson, A. W.: On the Use and
Significance of Isentropic Potential Vorticity Maps, Q. J. Roy. Meteorol. Soc., 111, 877–946, https://doi.org/10.1002/qj.49711147002, 1985. a, b, c, d
Huang, C. S. Y. and Nakamura, N.: Local Finite-Amplitude Wave Activity as a Diagnostic of Anomalous Weather Events, J. Atmos. Sci., 73, 211–229, https://doi.org/10.1175/JAS-D-15-0194.1, 2016. a, b
Huang, C. S. Y. and Nakamura, N.: Local wave activity budgets of the wintertime Northern Hemisphere: Implication for the Pacific and Atlantic storm tracks, Geophys. Res. Lett., 44, 5673–5682, https://doi.org/10.1002/2017GL073760, 2017. a
Huang, C. S. Y., Polster, C., and Silverman, V.: csyhuang/hn2016_falwa:
Release 0.6.1, Zenodo [code], https://doi.org/10.5281/zenodo.7033109, 2022. a
Illari, L.: A Diagnostic Study of the Potential Vorticity in a Warm Blocking Anticyclone, J. Atmos. Sci., 41, 3518–3526, https://doi.org/10.1175/1520-0469(1984)041<3518:ADSOTP>2.0.CO;2, 1984. a
Kautz, L.-A., Martius, O., Pfahl, S., Pinto, J. G., Ramos, A. M., Sousa, P. M., and Woollings, T.: Atmospheric Blocking and Weather Extremes over the
Euro-Atlantic Sector – a Review, Weather Clim. Dynam., 3, 305–336, https://doi.org/10.5194/wcd-3-305-2022, 2022. a
Luo, D., Cha, J., Zhong, L., and Dai, A.: A Nonlinear Multiscale Interaction
Model for Atmospheric Blocking: The Eddy-Blocking Matching Mechanism, Q. J. Roy. Meteorol. Soc., 140, 1785–1808, https://doi.org/10.1002/qj.2337, 2014. a, b
Luo, D., Zhang, W., Zhong, L., and Dai, A.: A Nonlinear Theory of Atmospheric Blocking: A Potential Vorticity Gradient View, J. Atmos. Sci., 76, 2399–2427, https://doi.org/10.1175/JAS-D-18-0324.1, 2019. a
Lupo, A. R. and Bosart, L.: An Analysis of a Relatively Rare Case of
Continental Blocking, Q. J. Roy. Meteorol. Soc., 125, 107–138, https://doi.org/10.1256/smsqj.55306, 1999. a
Madonna, E., Li, C., Grams, C. M., and Woollings, T.: The Link between
Eddy-Driven Jet Variability and Weather Regimes in the North Atlantic-European Sector, Q. J. Roy. Meteorol. Soc., 143, 2960–2972, https://doi.org/10.1002/qj.3155, 2017. a, b, c
May, R. M., Goebbert, K. H., Thielen, J. E., Leeman, J. R., Camron, M. D., Bruick, Z., Bruning, E. C., Manser, R. P., Arms, S. C., and Marsh, P. T.:
MetPy: A Meteorological Python Library for Data Analysis and
Visualization, B. Am. Meteorol. Soc., 103, E2273–E2284,
https://doi.org/10.1175/BAMS-D-21-0125.1, 2022. a
Michel, C., Rivière, G., Terray, L., and Joly, B.: The Dynamical Link
between Surface Cyclones, Upper-Tropospheric Rossby Wave Breaking and the
Life Cycle of the Scandinavian Blocking, Geophys. Res. Lett., 39, L10806, https://doi.org/10.1029/2012GL051682, 2012. a
Michel, C., Madonna, E., Spensberger, C., Li, C., and Outten, S.: Dynamical
Drivers of Greenland Blocking in Climate Models, Weather Clim. Dynam., 2, 1131–1148, https://doi.org/10.5194/wcd-2-1131-2021, 2021. a
Miller, D. E. and Wang, Z.: Northern Hemisphere Winter Blocking: Differing Onset Mechanisms across Regions, J. Atmos. Sci., 79, 1291–1309, https://doi.org/10.1175/JAS-D-21-0104.1, 2022. a, b, c, d
Nakamura, H. and Wallace, J. M.: Synoptic Behavior of Baroclinic Eddies
during the Blocking Onset, Mon. Weather Rev., 121, 1892–1903,
https://doi.org/10.1175/1520-0493(1993)121<1892:SBOBED>2.0.CO;2, 1993. a
Nakamura, H., Nakamura, M., and Anderson, J. L.: The Role of High- and
Low-Frequency Dynamics in Blocking Formation, Mon. Weather Rev., 125, 2074–2093, https://doi.org/10.1175/1520-0493(1997)125<2074:TROHAL>2.0.CO;2, 1997. a
Nakamura, N. and Zhu, D.: Finite-Amplitude Wave Activity and Diffusive Flux of Potential Vorticity in Eddy–Mean Flow Interaction, J. Atmos. Sci., 67, 2701–2716, https://doi.org/10.1175/2010JAS3432.1, 2010. a
Narinesingh, V., Booth, J. F., and Ming, Y.: Blocking and General Circulation
in GFDL Comprehensive Climate Models, J. Climate, 35, 3687–3703, 2022. a
Neal, E., Huang, C. S. Y., and Nakamura, N.: The 2021 Pacific Northwest Heat Wave and Associated Blocking: Meteorology and the Role of an Upstream Cyclone as a Diabatic Source of Wave Activity, Geophys. Res. Lett., 49, e2021GL097699, https://doi.org/10.1002/essoar.10510031.1, 2022. a, b, c
Pfahl, S., Schwierz, C., Croci-Maspoli, M., Grams, C. M., and Wernli, H.:
Importance of Latent Heat Release in Ascending Air Streams for Atmospheric
Blocking, Nat. Geosci., 8, 610–614, https://doi.org/10.1038/ngeo2487, 2015. a, b
Pomroy, H. R. and Thorpe, A. J.: The Evolution and Dynamical Role of Reduced Upper-Tropospheric Potential Vorticity in Intensive Observing Period One of FASTEX, Mon. Weather Rev., 128, 1817–1834,
https://doi.org/10.1175/1520-0493(2000)128<1817:TEADRO>2.0.CO;2, 2000. a
Quinting, J. F. and Vitart, F.: Representation of Synoptic-Scale Rossby Wave
Packets and Blocking in the S2S Prediction Project Database, Geophys. Res. Lett., 46, 1070–1078, https://doi.org/10.1029/2018GL081381, 2019. a
Rex, D. F.: Blocking Action in the Middle Troposphere and Its Effect upon Regional Climate, Tellus, 2, 275–301, https://doi.org/10.1111/j.2153-3490.1950.tb00331.x, 1950. a
Riboldi, J., Grams, C. M., Riemer, M., and Archambault, H. M.: A Phase
Locking Perspective on Rossby Wave Amplification and Atmospheric Blocking Downstream of Recurving Western North Pacific Tropical Cyclones, Mon. Weather Rev., 147, 567–589, https://doi.org/10.1175/MWR-D-18-0271.1, 2019. a
Rodwell, M. J., Magnusson, L., Bauer, P., Bechtold, P., Bonavita, M.,
Cardinali, C., Diamantakis, M., Earnshaw, P., Garcia-Mendez, A., Isaksen, L., Källén, E., Klocke, D., Lopez, P., McNally, T., Persson, A., Prates, F., and Wedi, N.: Characteristics of Occasional Poor Medium-Range Weather Forecasts for Europe, B. Am. Meteorol. Soc., 94, 1393–1405, https://doi.org/10.1175/BAMS-D-12-00099.1, 2013. a, b
Röthlisberger, M., Martius, O., and Wernli, H.: Northern Hemisphere
Rossby Wave Initiation Events on the Extratropical Jet – A Climatological Analysis, J. Climate, 31, 743–760, https://doi.org/10.1175/JCLI-D-17-0346.1, 2018. a
Shutts, G. J.: The Propagation of Eddies in Diffluent Jetstreams: Eddy Vorticity Forcing of `Blocking' Flow Fields, Q. J. Roy. Meteorol. Soc., 109, 737–761, https://doi.org/10.1002/qj.49710946204, 1983. a, b
Spreitzer, E., Attinger, R., Boettcher, M., Forbes, R., Wernli, H., and Joos,
H.: Modification of Potential Vorticity near the Tropopause by Non-Conservative Processes in the ECMWF Model, J. Atmos. Sci., 76, 1709–1726, https://doi.org/10.1175/JAS-D-18-0295.1, 2019. a
Steinfeld, D., Sprenger, M., Beyerle, U., and Pfahl, S.: Response of Moist and Dry Processes in Atmospheric Blocking to Climate Change, Environ. Res. Lett., 17, 084020, https://doi.org/10.1088/1748-9326/ac81af, 2022. a
Teubler, F. and Riemer, M.: Dynamics of Rossby Wave Packets in a Quantitative Potential Vorticity – Potential Temperature Framework, J. Atmos. Sci., 73, 1063–1081, https://doi.org/10.1175/JAS-D-15-0162.1, 2016.
a, b
Teubler, F., Riemer, M., Polster, C., Grams, C. M., Hauser, S., and Wirth, V.: Similarity and variability of blocked weather-regime dynamics in the Atlantic-European region, Weather Clim. Dynam. Discuss. [preprint], https://doi.org/10.5194/wcd-2022-56, in review, 2022. a, b
Thorndike, R. L.: Who belongs in the family, Psychometrika, 18, 267–276, https://doi.org/10.1007/BF02289263, 1953. a
Tilly, D. E., Lupo, A. R., Melick, C. J., and Market, P. S.: Calculated height tendencies in two southern hemisphere blocking and cyclone events: the
contribution of diabatic heating to block intensification, Mon. Weather Rev., 136, 3568–3578, 2008. a
White, R. H., Kornhuber, K., Martius, O., and Wirth, V.: From Atmospheric Waves to Heatwaves: A Waveguide Perspective for Understanding and Predicting
Concurrent, Persistent, and Extreme Extratropical Weather, B. Am. Meteorol. Soc., 103, E923–E935, https://doi.org/10.1175/BAMS-D-21-0170.1, 2022. a
Wirth, V., Riemer, M., Chang, E. K. M., and Martius, O.: Rossby Wave Packets on the Midlatitude Waveguide – A Review, Mon. Weather Rev., 146, 1965–2001, https://doi.org/10.1175/MWR-D-16-0483.1, 2018. a, b, c
Wolf, G. and Wirth, V.: Implications of the Semigeostrophic Nature of Rossby Waves for Rossby Wave Packet Detection, Mon. Weather Rev., 143, 26–38, https://doi.org/10.1175/MWR-D-14-00120.1, 2015. a, b
Woollings, T. J., Hoskins, B. J., Blackburn, M., and Berrisford, P.: A New
Rossby Wave-Breaking Interpretation of the North Atlantic Oscillation, J. Atmos. Sci., 65, 609–626, https://doi.org/10.1175/2007JAS2347.1, 2008. a
Woollings, T. J., Barriopedro, D., Methven, J., Son, S.-W., Martius, O.,
Harvey, B., Sillmann, J., Lupo, A. R., and Seneviratne, S.: Blocking and Its
Response to Climate Change, Curr. Clim. Change Rep., 4, 287–300, https://doi.org/10.1007/s40641-018-0108-z, 2018. a
Yamazaki, A. and Itoh, H.: Selective Absorption Mechanism for the Maintenance
of Blocking, Geophys. Res. Lett., 36, L05803, https://doi.org/10.1029/2008GL036770, 2009. a, b
Yeh, T.-C.: On Energy Dispersion in the Atmosphere, J. Atmos. Sci., 6, 1–16,
https://doi.org/10.1175/1520-0469(1949)006<0001:OEDITA>2.0.CO;2, 1949. a
Zimin, A. V., Szunyogh, I., Hunt, B. R., and Ott, E.: Extracting Envelopes
of Nonzonally Propagating Rossby Wave Packets, Mon. Weather Rev., 134,
1329–1333, https://doi.org/10.1175/MWR3122.1, 2006. a, b
Short summary
Weather regimes govern an important part of the sub-seasonal variability of the mid-latitude circulation. The year-round dynamics of blocked regimes in the Atlantic European region are investigated in over 40 years of data. We show that the dynamics between the regimes are on average very similar. Within the regimes, the main variability – starting from the characteristics of dynamical processes alone – dominates and transcends the variability in season and types of transitions.
Weather regimes govern an important part of the sub-seasonal variability of the mid-latitude...
