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Activity Number:
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346
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Type:
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Topic Contributed
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Date/Time:
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Wednesday, August 6, 2008 : 8:30 AM to 10:20 AM
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Sponsor:
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Section on Statistics and the Environment
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| Abstract - #302549 |
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Title:
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The Impacts of Radio Occultation Data on Analyses and Prediction of Tropical Cyclones Using WRF and an Ensemble Forecast System
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Author(s):
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Hui Liu*+ and Chris Snyder and Jeffrey Anderson and Y. H. Kuo
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Companies:
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National Center for Atmospheric Research and National Center for Atmospheric Research and National Center for Atmospheric Research and National Center for Atmospheric Research
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Address:
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1850 Table Mesa Dr., Boulder, CO, 80305,
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Keywords:
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data assimilation ; weather forecasting ; hurricanes ; GPS
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Abstract:
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Radio occultation (RO) refractivity from the COSMIC satellites is available globally since 2006. The data has water vapor and temperature information, is not contaminated by clouds or precipitation, and have relatively high vertical resolution in the lower troposphere. Observations of RO refractivity are assimilated in the WRF/DART ensemble kalman filtering system to evaluate the impact of these measurements on analyses and forecasts of tropical storms. The RO refractivity observations are assimilated with other (routine) satellite data using a 36 km resolution WRF model. Results are presented for hurricane Dean of 2007 and typhoon Shanshan of 2006. The RO observations reduce the bias of the water vapor analysis and improve the ensemble analyses and forecasts of the intensity and position of the tropical storms.
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