The 2019/20 Australian wildfires generated a persistent smoke-charged vortex rising up to 35 km altitude von Khaykin, Sergey, Legras, Bernard, Bucci, Silvia, Sellitto, Pasquale, Isaksen, Lars, Tencé, Florent, Bekki, Slimane, Bourassa, Adam, Rieger, Landon, Zawada, Daniel, Jumelet, Julien, Godin-Beekmann, Sophie

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On the use of EDA background error variances in the ECMWF 4D-Var von Bonavita, Massimo, Isaksen, Lars, Hólm, Elías

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ERA-20C: An Atmospheric Reanalysis of the Twentieth Century von Poli, Paul, Hersbach, Hans, Dee, Dick P., Berrisford, Paul, Simmons, Adrian J., Vitart, Frédéric, Laloyaux, Patrick, Tan, David G. H., Peubey, Carole, Thépaut, Jean-Noël, Trémolet, Yannick, Hólm, Elías V., Bonavita, Massimo, Isaksen, Lars, Fisher, Michael

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On the use of a Huber norm for observation quality control in the ECMWF 4D‐Var von Tavolato, Christina, Isaksen, Lars

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A simplified Extended Kalman Filter for the global operational soil moisture analysis at ECMWF von de Rosnay, Patricia, Drusch, Matthias, Vasiljevic, Drasko, Balsamo, Gianpaolo, Albergel, Clément, Isaksen, Lars

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EnKF and Hybrid Gain Ensemble Data Assimilation. Part I: EnKF Implementation von Hamrud, Mats, Bonavita, Massimo, Isaksen, Lars

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EnKF and Hybrid Gain Ensemble Data Assimilation. Part II: EnKF and Hybrid Gain Results von Bonavita, Massimo, Hamrud, Mats, Isaksen, Lars

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Wind Profile Satellite Observation Requirements and Capabilities von Stoffelen, Ad, Benedetti, Angela, Borde, Régis, Dabas, Alain, Flamant, Pierre, Forsythe, Mary, Hardesty, Mike, Isaksen, Lars, Källén, Erland, Körnich, Heiner, Lee, Tsengdar, Reitebuch, Oliver, Rennie, Michael, Riishøjgaard, Lars-Peter, Schyberg, Harald, Straume, Anne Grete, Vaughan, Michael

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Initialisation of Land Surface Variables for Numerical Weather Prediction von de Rosnay, Patricia, Balsamo, Gianpaolo, Albergel, Clément, Muñoz-Sabater, Joaquín, Isaksen, Lars

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CHARACTERISTICS OF OCCASIONAL POOR MEDIUM-RANGE WEATHER FORECASTS FOR EUROPE von Rodwell, Mark J, Magnusson, Linus, Bauer, Peter, Bechtold, Peter, Bonavita, Massimo, Cardinali, Carla, Diamantakis, Michail, Earnshaw, Paul, Garcia-Mendez, Antonio, Isaksen, Lars, Källén, Erland, Klocke, Daniel, Lopez, Philippe, McNally, Tony, Persson, Anders, Prates, Fernando, Wedi, Nils

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Drifting buoy pressures: Impact on NWP von Ingleby, Bruce, Isaksen, Lars

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THE ATMOSPHERIC DYNAMICS MISSION FOR GLOBAL WIND FIELD MEASUREMENT von Stoffelen, Ad, Pailleux, Jean, Källén, Erland, Vaughan, J. Michael, Isaksen, Lars, Flamant, Pierre, Wergen, Werner, Andersson, Erik, Schyberg, Arald, Culoma, Alain, Meynart, Roland, Endemann, Martin, Ingmann, Paul

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Initial Assessment of the Performance of the First Wind Lidar in Space on Aeolus von Reitebuch, Oliver, Lemmerz, Christian, Lux, Oliver, Marksteiner, Uwe, Rahm, Stephan, Weiler, Fabian, Witschas, Benjamin, Meringer, Markus, Schmidt, Karsten, Huber, Dorit, Nikolaus, Ines, Geiss, Alexander, Vaughan, Michael, Dabas, Alain, Flament, Thomas, Stieglitz, Hugo, Isaksen, Lars, Rennie, Michael, de Kloe, Jos, Marseille, Gert-Jan, Stoffelen, Ad, Wernham, Denny, Kanitz, Thomas, Straume, Anne-Grete, Fehr, Thorsten, von Bismarck, Jonas, Floberghagen, Rune, Parrinello, Tommaso

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Collecting and utilising crowdsourced data for numerical weather prediction: Propositions from the meeting held in Copenhagen, 4–5 December 2018 von Hintz, Kasper S., O'Boyle, Katharine, Dance, Sarah L., Al‐Ali, Saja, Ansper, Ivar, Blaauboer, Dick, Clark, Matthew, Cress, Alexander, Dahoui, Mohamed, Darcy, Rónán, Hyrkkanen, Juhana, Isaksen, Lars, Kaas, Eigil, Korsholm, Ulrik S., Lavanant, Marion, Le Bloa, Gwenaelle, Mallet, Emilie, McNicholas, Conor, Onvlee‐Hooimeijer, Jeanette, Sass, Bent, Siirand, Valeria, Vedel, Henrik, Waller, Joanne A., Yang, Xiaohua

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The evolution of the ECMWF hybrid data assimilation system von Bonavita, Massimo, Hólm, Elias, Isaksen, Lars, Fisher, Mike

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Accuracy of Balloon Trajectory Forecasts in the Lower Stratosphere von Dharmalingam, Selvaraj, Plougonven, Riwal, Hertzog, Albert, Podglajen, Aurélien, Rennie, Michael, Isaksen, Lars, Kébir, Sélim

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Use and impact of automated aircraft data in a global 4DVAR data assimilation system von CARDINALI, Carla, ISAKSEN, Lars, ANDERSSON, Erik

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The impact of Aeolus wind retrievals on ECMWF global weather forecasts von Rennie, Michael P., Isaksen, Lars, Weiler, Fabian, Kloe, Jos, Kanitz, Thomas, Reitebuch, Oliver

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Observing‐system impact assessment using a data assimilation ensemble technique: application to the ADM–Aeolus wind profiling mission von Tan, David G. H., Andersson, Erik, Fisher, Michael, Isaksen, Lars

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Potential use of an ensemble of analyses in the ECMWF Ensemble Prediction System von Buizza, Roberto, Leutbecher, Martin, Isaksen, Lars

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