Climate and Dynamics
Observing system simulation experiments at the National Centers for Environmental Prediction
Article first published online: 2 APR 2010
Copyright 2010 by the American Geophysical Union.
Journal of Geophysical Research: Atmospheres (1984–2012)
Volume 115, Issue D7, 16 April 2010
How to Cite
2010), Observing system simulation experiments at the National Centers for Environmental Prediction, J. Geophys. Res., 115, D07101, doi:10.1029/2009JD012528., et al. (
- Issue published online: 2 APR 2010
- Article first published online: 2 APR 2010
- Manuscript Accepted: 22 OCT 2009
- Manuscript Revised: 8 SEP 2009
- Manuscript Received: 21 MAY 2009
- observing system simulation experiment;
- Doppler wind lidar;
 Observing system impact assessments using atmospheric simulation experiments are conducted to provide an objective quantitative evaluation of future observing systems and instruments. Such simulation experiments using a proxy true atmosphere, Nature Run, are known as observing system simulation experiments (OSSEs). Through OSSEs, future observing systems that effectively use data assimilation systems in order to improve weather forecasts can be designed. Various types of simulation experiments have been performed in the past by many scientists, but the OSSE at the National Centers for Environmental Prediction (NCEP) presented in this paper is the most extensive and complete OSSE. The agreement between data impacts from simulated data and the corresponding real data is satisfactory. The NCEP OSSE is also the first OSSE where radiance data from satellites were simulated and assimilated. Since a Doppler wind lidar (DWL) is a very costly instrument, various simulation experiments have been funded and performed. OSSEs that evaluate the data impact of DWL are demonstrated. The results show a potentially powerful impact from DWL. In spite of the many controversies regarding simulation experiments, this paper demonstrates that carefully constructed OSSEs are able to provide useful information that influences the design of future observing systems. Various factors that affect the assessment of the impact are discussed.