COSMIC Data Analysis and Archive Center (CDAAC) Current Status and Future Plans
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1 COSMIC Data Analysis and Archive Center (CDAAC) Current Status and Future Plans Bill Schreiner B. Kuo, C. Rocken, S. Sokolovskiy, D. Hunt, B. Ho, X. Yue, T. K. Wee, K. Hudnut, M. Sleziak Sallee, T. VanHove UCAR/COSMIC Program Office
2 Outline COSMIC System Overview CDAAC Data Product Status and Highlights Neutral Atmosphere Ionosphere Future Plans Planned CDAAC 3.0 Enhancements Development and Processing Schedule Summary
3 Getting COSMIC Results to Weather Centers COSMIC OperaConal Processing TACC JCSDA NCEP RTS Input Data - COSMIC data - GPS ground data - GPS Bits - GFS Forecast - IGS/IGU ORB/CLK - Bernese Config files C D A A C Unidata s LDM WGET SFTP Science & Archive Research Community BUFR Files WMO standard 1 file / sounding AFWA N E S D I S GTS Meteo France ECMWF CWB UKMO JMA Canada Met.
4 CDAAC Processing Flow Atmospheric processing atmphs atmprf LEO data Level 0--level 1 Excess Phase Full Spectrum Abel Inversion 1-D Var Moisture Correction wetprf bfrprf Fiducial data POD (Orbits and clocks) Real time Task Scheduling Software Profiles podtec scnlv1 tiplv1 Ionospheric processing Excess Phase Processing ionphs Abel Inversion ionprf Combination with other data
5 COSMIC System Summary COSMIC spacecrau (power and awtude anomalies) and payloads (low SNRs) funczoning with some degradazon COSMIC RTS Download stazons Nominal NOAA: Fairbanks, Tromso, Wallops (> 70 passes/day) NSF/NASA: McMurdo (10 passes/day) ~20% missed dumps to due SpacecraU/Payload/RTS problems COSMIC 6 stazon Bit Grabber (GPS Data Bits) network Nominal CDAAC (2.0) producing profiles per day > 2.0M/2.1M Neutral Atm/Ionospheric profiles to date Data Latency > 90% observazons available within 3 hr Average BUFR file data latency ~90 min, single dump ~ 75 min CDAAC Reliability: > 99.5% Providing data to 1,198 registered users from 54 countries OperaZons funded through April 2011
6 COSMIC OccultaCon Count > 2 Million Profiles in Real Time Launch to present
7 Neutral Atmospheric Highlights
8 Data Product Summary MulZ mission profiles > 2.5M (atmprf: version ) - COSMIC (4/06 3/09: ~2M), CHAMP (5/01 10/08: 393,000), GRACE (11/06 3/09: 90,000), GPSMET (5/95 2/97: ~5,000: ~4,000 AS) COSMIC penetrazon to 1 km of surface - 85% high laztudes, negligible N bias - 65% low laztudes, negazve N bias wrt ECMWF (~2%) and Radiosondes (~1%) COSMIC Rising/SeWng mean N differences (~ %) in stratosphere (> 30 km) wrt ECMWF COSMIC Quality Control: ~35% marked bad - ~25% due to poor L2 signal quality Data Processing Status - Implemented/evaluated L2C processing - Implemented Phase Matching processing, szll using FSI - InvesZgated/improved filtering methods - InvesZgated/modified truncazon of RO signals - SZll using dynamic transizon height between GO/FSI DisseminaZng New Version of Data Products - Worked with weather centers to update BUFR files - Real Zme: since Oct 12, Post Processing (version ): since Apr 2009
9 Courtesy: Sean Healy ECMWF Improvements to CDAAC Inversion SoKware: > 20 km ECMWF Experiments: Old/New COSMIC data Nov Dec 08 and Jan 09 The COSMIC processing changes have improved the GRAS departures considerably, indicacng much beier consistency between the data. Noise normalised GRAS Departures Red = with oper. COSMIC Black = with new COSMIC SD (o-b)/apple Mean (o-b)/apple
10 Improvements to CDAAC Inversion SoKware: < 6km OLD Inversion Software (With sliding median filter) COSMIC - ECMWF NEW Inversion Software (Without sliding median filter) COSMIC - ECMWF StaCsCcal comparison of COSMIC and ECMWF (high resolucon model) fracconal refraccvity differences versus alctude (km) for 1 July The lek panel is for COSMIC inversions that use the sliding median filter and the right panel is for inversions that don t use the sliding median filter. The red lines are the mean differences, the green lines are the standard deviacons of the differences, and the blue lines are the number of samples.
11 QuanCfy the Reproducibility of RO data: EsCmates of Structural Uncertainty of RO data Comparison of CHAMP RO data processed by GFZ, JPL, UCAR, and WegC FracZonal RefracZvity Anomalies (Ho et al. JGR, 2009) Independent of processing procedures : the trend uncertainty from GPS RO data processed by different centers < 0.02%/5yrs Boulder, Shu-peng CO Ben Ho, UCAR/COSMIC Fourth FORMOSAT 3/COSMIC Data Users Workshop
12 Ionospheric Highlights
13 Electron Density Profiles Electron Density Profiles, EDPs (level2:ionprf) - Abel Inversion: Potentially significant inversion errors below F2 layer, less so above F2 layer - Number: COSMIC (4/06-3/09: 2.1M), CHAMP (5/01-10/08: 300,000) - NOTE: Fixed COSMIC s/w bug, corrected noisy profiles after Quality Control still needs improvement ED at 100km from COSMIC 110 km Simulation Lei et al., 2006JA Yue et al., GRL (submitted) Unit: /
14 Absolute TEC (level1b:podtec) Absolute TEC Data - Number: COSMIC (4/06 3/09: 2.5M), CHAMP (5/01 10/08: 200,000) - NOTE: Fixed COSMIC s/w bug and reprocessed onwards (700,00 more arcs) - Absolute accuracy ~ 1 3 TECU - RelaZve accuracy ~ TECU at 1 Hz - Quality Control is good Deviation (TECU) vtec(ssw month) - vtec(pressw month) Ionospheric response to sudden stratospheric warming event (Jan 09) seen in topside ionosphere - vtec in the topside increase in the morning - vtec decreases in the afternoon - This results agrees with study of ground-based GPS [Goncharenko et al. 2009,CEDAR meeting] - NEW: Topside TEC is good evidence that the SSW affects the ionosphere by changing the tides and then the electric field in ionosphere (only EXB can reach high altitude)
15 ScinZllaZon S4 (level2:atmprf) ScinCllaCon Data - Computed from 50 Hz OccultaZon L1 SNR observazons (60 80 km alt) - Number: COSMIC (4/06 3/09: ~2M), CHAMP (5/01 10/08: 393,000), GRACE (11/06 3/09: 90,000), GPSMET (5/95 2/97: ~5,000: ~4,000 AS) COSMIC ScinZllaZon S4 (level1b:scnlv1) - Downloaded 1 Hz values from all line of sights (based on 50 Hz data) - Number: > 4.5M LEO GPS arcs Scintillation from level1b:scnlv1 (9-sec averages) E layer F layer
16 Tiny Ionospheric Photometer (TIP) COSMIC Calibrated TIP radiances (level1b:tiplv1) - TIP payload off for FM2/3 - > 1400 hours of quality controlled data COSMIC TIP: , ~1400 hours
17 Future Plans CDAAC Enhancements CDAAC 3.0 System Improve data processing, storage capability, reliability Improve souware and configurazon management for mulz mission processing (GRAS) Improve data access (FTP site,..), update website, DB interface Improve orbit, clock and excess phase processing Neutral Atmospheric Products ConZnue to inveszgate structural uncertainty in LT Explore new methods of BA opzmizazon InvesZgate ionospheric correczon (large scale higher order residuals, use of L5) Restructure Inversion Process (for mulz missions, efficiency and tailored products) Add new BAD flag bitmask New 1DVAR procedure Provide climate products Ionospheric Products Improve EDPs by using informazon on horizontal gradients Improve Quality Control: add BAD flag, error eszmates Provide climate products
18 Future Plans cont Data Product ValidaZon / CalibraZon - Develop comparison tools - RO RO - NWP/Climate Models - Radiosondes - Ground based GPS PWV - AMSU, AIRS, SSMI, Saber Development and Data Processing Schedule - ConZnue development of CDAAC Re process CHAMP ( ) 1 2 months - Re process COSMIC ( ) 3 6 months - Re process GRACE ( ) 1 month - Re process GPSMET ( ) 1 month - Process TerraSAR X ( ) 1 month - Process SAC C ( ) 1 2 months - Process Metop/GRAS? - Complete CDAAC months - Re Process
19 Summary Some level of degradazon of COSMIC spacecrau and payloads ~90% COSMIC observazons ( ) available within 3 hr (~90 min average latency) CDAAC Reliability: > 99.5% COSMIC data having posizve impact on NWP, ionosphere and climate studies, instrument validazon/calibrazon DisseminaZng new version of data products ConZnuing development of CDAAC 3.0 Re processing with consistent souware underway
20 Acknowledgments NSF Taiwan s NSPO NASA/JPL, NOAA, USAF, ONR, NRL Broad Reach Engineering
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