Assessment of AMV's from COMS in the ECMWF system

TitleAssessment of AMV's from COMS in the ECMWF system
Publication TypeMiscellaneous
Year of Publication2015
AuthorsLee, S-H, Salonen, K, Bormann, N
Secondary TitleTechnical Memorandum
Number757
Abstract

This study evaluates Atmospheric Motion Vectors (AMVs) from the Korean geostationary Communication, Ocean and Meteorological Satellite (COMS) in the European Centre for Medium-Range Weather Forecasts (ECMWF) system for a 6-month period. The monitoring statistics of the COMS AMVs have been compared to those of the operational Multifunction Transport Satellite (MTSAT) AMVs because both satellites cover a similar region around East Asia. The First Guess (FG) departure statistics for the MTSAT and COMS AMVs have consistent features geographically, although the quality characteristics for both satellites are slightly different. Height assignment errors of COMS AMVs have also been estimated based on model best-fit pressure statistics, suggesting height assignment errors that are broadly in line with those of other AMV products. Assimilation experiments have been performed to assess the impact of COMS AMVs in a system that uses all operationally assimilated conventional and satellite observations. New quality control criteria for COMS AMVs are investigated, designed to improve the impact on ECMWF model analyses and forecasts. As a result, the use of COMS AMVs in the ECMWF system shows a positive impact on the forecast quality in the absence of AMVs from MTSAT. When COMS AMVs are added in the presence of MTSAT AMVs the forecast impact is more neutral.