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The impact on EOP predictions of AAM forecasts from the ECMWF and NCEP

Show simple item record Gross, R. S. De Viron, O. Van Dam, T. 2009-10-26T20:02:52Z 2009-10-26T20:02:52Z 2007-09-17
dc.identifier.citation Journies, Synthmes de Reference Spatio-Temporals, Meudon, France, Septmeber 17, 2007. en_US
dc.identifier.clearanceno 08-2201
dc.description.abstract Predictions of UT1 are improved when dynamical model-based forecasts of the axial component of atmospheric angular momentum (AAM) are used as proxy length-of-day (LOD) forecasts (Freedman et al. 1994; Johnson et al. 2005). For example, the accuracy of JPL’s predictions of UT1 are improved by nearly a factor of 2 when AAM forecast data from the National Centers for Environmental Prediction (NCEP) are used. Given the importance of AAM forecasts on the accuracy of UT1 predictions, other sources of AAM forecasts should be sought. Here, the angular momentum of the forecasted wind fields from the European Centre for Medium-Range Weather Forecasts (ECMWF) are computed and used to predict UT1. The results are compared to those obtained using NCEP forecasts. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2007. en_US
dc.subject atmospheric angular momentum (AAM) en_US
dc.subject AAM forecasts en_US
dc.title The impact on EOP predictions of AAM forecasts from the ECMWF and NCEP en_US
dc.type Preprint en_US

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