Addition to Baseline Observing System Experiment Impacts from N19-AMSU/MHS, SNPP-ATMS, and Aqua-AIRS using the NCEP Global Data Assimilation System
For these observing system experiments, forecast results are compared through 168 h for periods covering more than a month during both the summer and winter seasons of each hemisphere. The assimilation –forecast system used for these experiments is the National Centers for Environmental Prediction (NCEP) Global Data Assimilation System (GDAS) and the Global Forecast System (GFS). The May 2012 version of the GDAS/GFS, at a resolution of T574L64 will be used. The first 15 days are ignored to allow the GDAS/GFS to adjust to the new data volume. Impact statistics are derived from the 45 days following the adjustment period. Anomaly correlations (ACs) of extratropical geopotential heights by hemisphere, root-mean-square (RMS) errors of winds in the tropics, forecast impacts (FIs), and hurricane track forecasts are evaluated for experiments run during both seasons.