caa a22 4500 469052562 CHVBK 20180323132834.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF01025504 doi (NATIONALLICENCE)springer-10.1007/BF01025504 On the impact on forecast accuracy of the step-mountain (eta) vs. sigma coordinate [Elektronische Daten] [Fedor Mesinger, Thomas Black] Summary: Impact on forecast accuracy of the choice of the step-mountain ("eta”) vs. the traditional sigma coordinate is examined by using a model which can be run as either an eta or sigma system model via a simple switch in its code. This is done by (a) synoptic examination of the differences in a set of three forecasts, and (b) comparison of precipitation skill scores in a set of nine consecutive forecasts; each of these sets of forecasts was performed using one and then the other of the two systems. Both efforts indicate that greater accuracy is achnieved in the step-mountain coordinate forecasts. The three forecasts examined from the synoptic point of view are also compared against forecasts of another sigma system model. The two sigma models are found to have errors of an almost identical pattern (two cases) or to have errors which seemed to have the same basic cause. Springer-Verlag, 1992 Mesinger Fedor UCAR Visiting Research Program at the U.S. National Meteorological Center, USA aut Black Thomas National Meteorological Center, NSW, NOAA, 20233, Washington, D.C., USA aut Meteorology and Atmospheric Physics Springer-Verlag 50/1-3(1992-03-01), 47-60 0177-7971 50:1-3<47 1992 50 703 https://doi.org/10.1007/BF01025504 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01025504 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mesinger Fedor UCAR Visiting Research Program at the U.S. National Meteorological Center, USA aut NATIONALLICENCE 700 1- Black Thomas National Meteorological Center, NSW, NOAA, 20233, Washington, D.C., USA aut NATIONALLICENCE 773 0- Meteorology and Atmospheric Physics Springer-Verlag 50/1-3(1992-03-01), 47-60 0177-7971 50:1-3<47 1992 50 703 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer