Guest seminar, Professor Heikki Järvinen, University of Helsinki, Finland
Seminar
Date: Thursday 9 December 2021
Time: 14.15 – 15.15
Location: C609 Rossbysalen, MISU, Svante Arrhenius väg 16C, 6th floor
Continuous Data Assimilation at ECMWF in IFS CY46
Name
Professor Heikki Järvinen, University of Helsinki, Finland
Title
Continuous Data Assimilation at ECMWF in IFS CY46
Abstract
A new configuration of the European Centre for Medium-Range Weather Forecasts (ECMWF) incremental 4D-Var data assimilation (DA) system is discussed which builds upon the quasi-continuous DA concept proposed in the mid-1990s. Rather than working with a fixed set of observations, the new 4D-Var configuration exploits the near-continuous stream of incoming observations by introducing recently arrived observations at each outer loop iteration of the assimilation. This allows the analysis to benefit from more recent observations. Additionally, by decoupling the start time of the DA calculations from the observational data cut-off time, real-time forecasting applications can benefit from more expensive analysis configurations that previously could not have been considered. For real-time forecasting applications, the Continuous DA framework allows configurations which clearly outperform the best available affordable non-continuous configuration. Continuous DA became operational at ECMWF in June 2019 and led to significant 2 to 3% reductions in medium-range forecast root mean square errors, which is roughly equivalent to 2–3 hours of additional predictive skill.
Tid
Thursday December 9, 14:15-15:15
Place
C609 Rossbysalen, MISU, Svante Arrhenius väg 16C, 6th floor
If you want to be added to the seminar mailing list to receive regular information about our seminars, please contact our IT person.
Welcome!
Last updated: November 17, 2021
Source: MISU