Abstract
I will introduce ICON-DREAM (ICON-Dual Resolution Reanalysis for Emulators, Applications and Monitoring), the new reanalysis from the Deutscher Wetterdienst (DWD), designed to deliver high-quality data, with a focus on Europe. Built on the ICON NWP global framework, it features a two-way coupled nest at 6.5 km over Europe (13 km globally), 120 vertical levels, and a 3-hourly EnVar data assimilation cycle - offering higher resolution and more frequent updates than ERA5 and ERA6.
We’ll present key evaluation results showing ICON-DREAM outperforms COSMO-REA6 and ERA5 in terms of biases and RMSE, particularly for surface and lower-troposphere observations. Further, SYNOP biases show no diurnal cycle, unlike the previous COSMO-REA6. ICON-DREAM currently spans from 2010 to the present, with one month lag. The ongoing work aims to extend it back to the 1980s, including adapting to legacy data formats and reprocessed satellite inputs, to which I will outline the challenges.
Further, I will tease the regional convection-permitting reanalyses, ICON-FORCE (Fine-scale Observation-based Reanalysis for Central Europe), which is a 2.1km - 2moment micro-physics ensemble reanalyses that will provide 5-minutes modeled quantities for the 2016-current period.
Short bio
Arianna Valmassoi is a researcher at the Deutscher Wetterdienst, currently leading the development and production of the new ICON reanalyses: the dual-resolution global product ICON-DREAM and the regional convection-permitting ICON-FORCE. Before joining DWD, Arianna was part of the Hans-Ertel Zentrum (HErZ) and worked at the University of Bonn. She holds a Ph.D. from University College Dublin, with a six-month research scholarship at the National Center for Atmospheric Research (NCAR) in Colorado and a four-month stay at the Alma Mater Studiorum University of Bologna.