1. 1 Status of ARM Best Estimate Product CrIS EDR Cal/Val Telecon 7-May-2013 L. Borg, D. Tobin, R. Knuteson, N. R. Nalli with support from our ARM partners … Donna Holdridge, Jenni Kyrouac, Jim Mather, Douglas Sisterson

2. 2 ARM Best Estimate Sonde Product Overview: ARM data is being collected at NSA, SGP, & TWP-Manus to validate NPP CrIMSS EDRs NSA & SGP: sondes launched 45 minutes prior and 5 minutes prior to overpass TWP: single sonde launched 15 minutes prior to overpass Zero th Order Processing: Sondes are interpolated onto common pressure grid MWR PWV scaling applied to sonde RHs & WV mixing ratios Sondes interpolated to overpass time Data written to netcdf Time [UTC} Example Sonde Pair Launch Timing Pressure [hPa] Primary ARM data products used: sondewnpn: RS-92 balloon-borne sounding system: Vaisala-processed mwrlos: microwave radiometer: water liq, & vapor along los path

3. Status Phase-1 Sonde Launches ARM-NSAARM-SGPARM-TWP LocationBarrow, Alaska, USAPonca City, Oklahoma, USA Manus Island, Papua New Guinea RegimePolar ContinentMidlatitude Continent, Rural Tropical Pacific Warm Pool, Island Planned N180 90 Launched n1908978 Launched n29089--- Time FrameJul - Dec 2012Jul 2012 - Jan 2013Jul 2012 – May 2013 Sondes completed at NSA & SGP, but ongoing at TWP-Manus 3

4. Temperature [K] Pressure [mb] NSA Temperature [K] SGP Pressure [mb] Temperature [K] TWP-Manus Pressure [mb] Sonde Profiles H2O[g/kg] Pressure [mb] Approximate Overpass Times 13:00 UTC (04:00 AKST) 21:00 UTC (12:00 AKST) H2O[g/kg] Pressure [mb] Approximate Overpass Times 08:00 UTC (02:00 CST) 19:00 UTC (13:00 CST) Limited collection sites, but representing a wide range of climatic conditions Highly accurate measurements 4 H2O[g/kg] Pressure [mb] Approximate Overpass Times 03:00 UTC (13:00 PGT) 15:00 UTC (01:00 PGT)

5. Pressure [mb] Altitude [km] Interpolated Sondes 5 NSA 5 Sample MWR Measurements: NSA Time [UTC] Pressure [mb] NSA Overpass: 29-Jul-2012 21:31:26 UTC Time [UTC] pwv [cm] lwp [cm] MWR Data Time [UTC] Time [UTC] versus MWR Scale Factor at NSA: mean_mwrsf = 1.018

6. mwr scale factor mean=1.018 mwr scale factor mean=1.0348 mwr scale factor mean=1.0239 Time [UTC] mwr scale factor NSA Time [UTC] mwr scale factor SGP Time [UTC] mwr scale factor TWP MWR Scale Factors 6 Mean MWR scale factors are close to 1

7. 7 mean stdev H2O Difference [g/kg] Temperature Difference [K] Pressure [mb] NSASGP Pressure [mb] Differences Between Sonde Pairs 7 This analysis does not follow the official 1km/2km layering methodology for reporting statistics SGP - The variability in temperature that occurs within 45 minutes is 1°K

8. 8 CrIMSS GDAS CrIMSS and GDAS Matchup H2O [g/kg] Pressure [mb] This analysis does not follow the official 1km/2km layering methodology for reporting statistics Pressure [mb] Temperature [K]

9. 9 CrIMSS GDAS Temperature [K] Pressure [mb] RH [%] Pressure [mb] CrIMSS and GDAS Matchup This analysis does not follow the official 1km/2km layering methodology for reporting statistics

10. mean stdev ARMBE Comparisons with CrIMSS & GDAS Temperature Difference [K] Pressure [mb] NSA ARMBE-CrIMSS Temperature Difference [K] Pressure [mb] ARMBE-GDAS Temperature Difference [K] SGP Pressure [mb] ARMBE-CrIMSS Pressure [mb] Temperature Difference [K] ARMBE-GDAS TWP Temperature Difference [K] ARMBE-CrIMSS Pressure [mb] Temperature Difference [K] ARMBE-GDAS Pressure [mb] 10 Analysis uses CrIMSS EDRs with MX Version 5.3 - 6.5 This analysis does not follow the official 1km/2km layering methodology for reporting statistics

11. 11 Next Steps ARMBE v0p0 product was distributed internally December 26, 2012 ARMBE v0p1 product will be distributed to team within the week Zero th Order ARMBE product including recent TWP-Manus sondes Updated sonde averaging scheme Updated figures Additional variables saved to netcdf ARMBE v1 product under development Use gdas data in sonde interpolation and to account for scene spatial variability Perform vertical averaging and resolution reduction using official 1km/2km methodology Use CrIMSS EDRs with more recent MX versions Include cloud height information We recommend that Phase-2 of the sonde launches begin