NAVGEM Forecast and Observation Impact Experiments with Assimilation of ECWMF Analysis Data in the Global Domain
Abstract
The analyses, forecasts, and adjoint-derived estimates of observation-impact are compared between a control simulation of NAVGEM and simulations that include assimilation of wind and temperature pseudo-raob profiles derived from the ECMWF analysis, representing a synthetic dataset of high-quality observations. Assimilation of these pseudo-raob profiles, in this experimental context, improves NAVGEM forecast skill and reduces temperature and height biases in NAVGEM analyses and forecasts, particularly in southern hemisphere high-latitudes, where radiance observations are the predominate type of regular observation data. Assimilation of pseudo-raob observations reduces the impact of regular in situ and satellite observation types. However, with improvement of forecasts and analyses, there is a reduction in total observation-impact through convergence of the background and analysis state trajectories
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 22, 2016
- Accession Number
- AD1108726
Entities
People
- Brett T. Hoover
- Rolf H. Langland
Organizations
- United States Naval Research Laboratory