Forecast impact experiment with GPS radio occultation measurements

摘要: [1] Refractivity profiles from CHAMP GPS radio occultation measurements have been assimilated into the Met Office numerical weather prediction (NWP) system. A forecast impact experiment was run using 16 days of data May/June 2001, in addition to conventional and satellite observations which are used operational forecasts. Although typically only 160 daily, it is demonstrated that they reduce NWP temperature analysis mean root square (RMS) differences against radiosondes upper troposphere lower stratosphere. significant found Southern Hemisphere where 24 96 hour 250 hPa RMS reduced by ∼0.1 K. No improvement humidity forecasts because refractivity values below 4 km not experiment. These results encouraging would support case for if were available near real time.