= PDAF at the EGU General Assembly 2021 = The research group developing PDAF will be present at the EGU General Assembly from April 19 to 30, 2021 online. == Short Course == **SC5.14: Practical data assimilation with the Parallel Data Assimilation Framework**[[BR]] Convener: Lars Nerger | Co-conveners: Wolfgang Kurtz, Nabir Mamnun, Qi Tang, Gernot Geppert Friday, 30 April, 10:00 - 11:00, [https://meetingorganizer.copernicus.org/EGU21/session/38988 Online session] In this Short Course we provide an overview of ensemble data assimilation and how to apply it using PDAF.[[BR]] For the hands-on example we will provide a tutorial version of PDAF that will be downloadable without registration. The download link will be announced during the short course. Tutorial code: [http://pdaf.awi.de/EGU2021/download.php Tutorial code package][[BR]] Slides: [http://pdaf.awi.de/EGU2021/Tutorial_EGU21.pdf Full set of Slides] == Session on Data Assimilation == **NP5.1 - Inverse problems, Predictability, and Uncertainty Quantification in Geosciences using data assimilation and its combination with machine learning**[[BR]] Convener: Javier Amezcua | Co-conveners: Alberto Carrassi, Sergey Frolov, Tijana Janjic, Lars Nerger, Olivier Talagrand[[BR]] Tuesday, 27 April, 09:00–12:30 CEST == Presentations by PDAF developers == **Ensemble data assimilation for systems with different degrees of nonlinearity with a hybrid nonlinear-Kalman ensemble transform filter**[[BR]] Lars Nerger[[BR]] vPICO, NP5.1, Tuesday, 27 April, 9:23-9:25 CEST **Strongly coupled data assimilation with the coupled ocean-atmosphere model AWI-CM: comparison with the weakly coupled data assimilation**[[BR]] Qi Tang, Longjiang Mu, Helge Goessling, Tido Semmler, and Lars Nerger[[BR]] vPICO, NP5.1, Tuesday, 27 April, 11:12-11:14 CEST == Presentations by PDAF Users == There will also be presentations by different users of PDAF, for example[[BR]] **A large ensemble decadal prediction system with MPI-ESM**[[BR]] Sebastian Brune, Vimal Koul, David Marcolino Nielsen, Laura Hövel, Holger Pohlmann, André Düsterhus, and Johanna Baehr[[BR]] vPICO, CL2.5/AS4.18/HS13.33/NH1.29/NP5.10, Monday, 26 April, 09:12–09:14 **Nemo-Nordic 2.0: Updated Baltic Sea model based on NEMO 4.0**[[BR]] Tuomas Kärnä, Ida Ringgaard, Vasily Korabel, Adam Nord, Patrik Ljungemyr, Saeed Falahat, Lars Axell, Anja Lindenthal, Simon Jandt-Scheelke, Ilja Maljutenko, and Svetlana Verjovkina[[BR]] vPICO, OS4.4, Monday, 26 April, 15:36-15:38 **Ensemble-based data assimilation of volcanic aerosols using FALL3D+PDAF**[[BR]] Leonardo Mingari, Andrew Prata, and Federica Pardini[[BR]] vPICO, NH6.9/EMRP2.3/ESSI2.4/GD8.4/GMPV1.6/SM8.3, Thursday, 29 April, 11:00–11:02 **Inferring mantle viscosity through data assimilation of relative sea level observations in a glacial isostatic adjustment model**[[BR]] Reyko Schachtschneider, Jan Saynisch-Wagner, Volker Klemann, Meike Bagge, and Maik Thomas[[BR]] vPICO, CR3.9/CL4.4/G3.7/GD8.11/GM7.2, Thursday, 29 April, 15:51–15:53 **Analyzing the propagation of drought through water storages using global scale GRACE-based data assimilation**[[BR]] Helena Gerdener, Kerstin Schulze, Olga Engels, Jürgen Kusche, Hannes Müller Schmied, Christoph Niemann, Sebastian Ackermann, and Petra Döll[[BR]] vPICO, HS4.2, Friday, 30 April, 15:46–15:48 **Coupling the Community Land Model 5.0 with the Parallel Data Assimilation Framework**[[BR]] Lukas Strebel, Heye Bogena, Harry Vereecken, and Harrie-Jan Hendricks Franssen[[BR]] vPICO, HS1.2.6, Friday, 30 April, 15:40-15:44 **Building a coupled data assimilation system for the atmosphere, land-surface and subsurface on the catchment scale**[[BR]] Bernd Schalge, Barbara Haese, Bastian Waldowski, Natascha Brandhorst, Emilio Sanchez, Ching Pui Hung, Shaoning Lv, Lennart Schüler, Harald Kunstmann, Olaf Cirpka, Sabine Attinger, Stefan Kollet, Insa Neuweiler, Harrie-Jan Hendricks Franssen, and Clemens Simmer[[BR]] vPICO, HS1.2.6, Friday, 30 April, 15:42-15:46 **Estimation of water table, soil states and parameters of integrated subsurface-land surface models by data assimilation**[[BR]] Ching Pui Hung, Bernd Schalge, Gabriele Baroni, Emilio Sanchez, Olaf Cirpka, Stefan Kollet, Insa Neuweiler, Clemens Simmer, and Harrie-Jan Hendricks Franssen[[BR]] vPICO, HS1.2.6, Friday, 30 April, 15:46-15:48 **Updating the soil hydraulic parameters in a 3D subsurface model**[[BR]] Natascha Brandhorst and Insa Neuweiler[[BR]] vPICO, HS1.2.6, Friday, 30 April, 15:48-15:50