Katrin Lonitz – Nearly 20 years of GNSS-RO data assimilation at ECMWF
July 15 @ 16:00 - 17:00
In cooperation with the Hans-Ertel-Zentrum (HErZ) CESOC kindly invites you to a talk given by Dr. Katrin Lonitz, Scientist for Earth System Assimilation, Actively Sensed Observations Meteorology and Air Quality Section at the European Centre for Medium-Range Weather Forecasts (ECMWF), with the title:
Nearly 20 years of GNSS-RO data assimilation at ECMWF
Date: 15 July 2025,
Time: 16:00 CEST
Location: Lecture Hall 4.001 (4th floor), Höninger Weg 100, 50969 Cologne
For online participation, please contact info@cesoc.net
————————————————————————————————-
Abstract
Since December 2006, the European Centre for Medium-Range Weather Forecasts (ECMWF) has assimilated Global Navigation Satellite System Radio Occultation (GNSS-RO) data into its operational forecasting system. GNSS-RO data provides high-vertical-resolution measurements sensitive to pressure, temperature and humidity, with particularly high accuracy in the upper troposphere and lower stratosphere.
In this talk, I review the evolution of GNSS-RO data assimilation at ECMWF, from initial implementation to its current use of data from multiple satellite constellations including those operated by commercial providers. Key milestones are highlighted, along with advances in data usage and assimilation techniques, impacts on forecast skill, and the role of GNSS-RO in supporting climate reanalyses and long-term monitoring.
Bio: https://www.ecmwf.int/en/about/who-we-are/staff-profiles/katrin-lonitz