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Please use this identifier to cite or link to this item:
http://hdl.handle.net/2014/41459
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| Title: | The impact on EOP predictions of AAM forecasts from the ECMWF and NCEP |
| Authors: | Gross, R. S.
De Viron, O.
Van Dam, T. |
| Keywords: | atmospheric angular momentum (AAM)
AAM forecasts |
| Issue Date: | 17-Sep-2007 |
| Publisher: | Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2007. |
| Citation: | Journies, Synthmes de Reference Spatio-Temporals, Meudon, France, Septmeber 17, 2007. |
| 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. |
| URI: | http://hdl.handle.net/2014/41459 |
| Appears in Collections: | JPL TRS 1992+
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