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GPS Observations for Atmospheric Science Ground-based and Radio Occultation Observations for Weather, Climate and Ionosphere C. Rocken, S. Sokolovskiy, D. Hunt, B. Schreiner, B. Kuo, M.Sleziak, J. Braun UCAR / COSMIC Program - Boulder CO
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Overview Ground based observations –Data availability Radio Occultation (RO) introduction Scientific and societal impact of RO –Weather –Climate –Ionosphere How to get RO data
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Real-Time Network
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Global Sites
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GPS and MWR Comparisons Arctic rms = 0.73mm Mid-Latitude rms = 0.93 mm Tropics rms = 1.65 mm
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BMB+PW GFS Six-Hour Forecast Using GPS PW
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Data Access and Availability COSMIC processes stations in North America in hourly batches (and daily), using a 30 minute piecewise linear estimation strategy. Global stations are processed in daily batches. All data processed by the COSMIC program are available via the following methods –LDM distribution (see http://www.suominet.ucar.edu/suomiQuestions.html#Get%20LDM ) http://www.suominet.ucar.edu/suomiQuestions.html#Get%20LDM –Web distribution http://www.suominet.ucar.edu/data/index.htmlhttp://www.suominet.ucar.edu/data/index.html – Including NetCDF, ASCII download by network, and ASCII download by individual station. There is also a database interface that allows time series plotting and download queries –http://www.suominet.ucar.edu/dataQuery/suomidata.htmlhttp://www.suominet.ucar.edu/dataQuery/suomidata.html
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Radio Occultation
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Temperature [C] at 100 mb (16km) Evolving COSMIC Constellation
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Comparison of collocated Profiles
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Statistical comparison of FM3-FM4 Soundings separation < 10 km Schreiner et al. 2007 0.2% precision between 10-20 km
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Over 2.7 Million Profiles 4/21/06- 8/10/08 Neutral Atmosphere Ionosphere
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Detection Of Boundary Layer With RO
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ABL Height Observations During COSMIC Year 1 (bending angle gradient > 1e-2 rad/dH, height < 3 km)
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Leading Weather Center Newsletters
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Sean Healy, ECMWF ECMWF SH T Forecast Improvements from COSMIC Assimilation of bending angles above 4 km
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Impact of COSMIC on Hurricane Ernesto (2006) Forecast Without COSMIC With COSMIC Results from Hui Liu, NCAR
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Impact of COSMIC on Hurricane Ernesto (2006) Forecast GOES Image With COSMIC GOES Image from Tim Schmitt, SSEC
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3-D structure of the feature during daytime ( constant LT) Weaker EIAStronger EIAWeaker EIA Stronger EIA 12:00 LT ↑ Tiger Liu, NCU
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InputDataInputData CDAAC CDAAC NESDISNESDIS GTS NCEP ECMWF CWB UKMO Canada Met. JMA BUFR Files WMO standard 1 file / sounding Getting COSMIC Results to Weather Centers Data available to weather centers within < 180 minutes of on-orbit collection JCSDA NRL Operational Processing Science & Archive TACC
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InputDataInputData CDAAC CDAAC LDM BUFR + wetPrf Files Getting COSMIC Results to Weather Centers Data available to any registered user with LDM access within < 180 minutes of on-orbit collection Real-Time Access for Science Users Science & Archive TACC Universities Companies Private users etc.
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COSMIC Result Latency 20-Jul - 16-Aug 2008
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http://www.cosmic.ucar.edu * Select the 'Sign Up ' link under COSMIC Accept data use agreement * Enter information: Name, Address, email, user_id, Password, planned use of data An email will be sent within 2-3 business days to indicate access has been granted. If interested in real-time profiles indicate that LDM acess is requested COSMIC Data Access 825 data users from 46 countries are registered
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Global FORMOSAT-3 / COSMIC Data Users ~825 users 46 Countries
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