A Comparison of the Impacts of Radiosonde and AMSU Radiance Observations in GSI Based 3DEnsVar and 3DVar Data Assimilation Systems for NCEP GFS

Figure 1

The increments of temperature fields after assimilating a single temperature observation at 700 hPa (shown at black dot in a). The temperature observation was one degree warmer than the background forecast. The thin and thick black contours are the background temperature forecasts and the increments of temperatures at model level 19, respectively. The unit is degrees K. (a) is for GSI3DVar using static covariance and (b) is for the 3DEnsVar with the full ensemble covariance.