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NCAR Activities Using TAMDAR Icing Data. Marcia K. Politovich, Jamie Braid Scott Landolt and Cory Wolff NCAR Research Applications Laboratory. Projects. Impacts on Current Icing Potential product What: Determine the impact of TAMDAR icing reports (positive and negative) on icing diagnoses
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NCAR Activities Using TAMDAR Icing Data Marcia K. Politovich, Jamie Braid Scott Landolt and Cory Wolff NCAR Research Applications Laboratory
Projects • Impacts on Current Icing Potential product • What: Determine the impact of TAMDAR icing reports (positive and negative) on icing diagnoses • Why: Do results support FAA/NWS funding of TAMDAR data stream? • Funded by: AIRDAT • Description of icing data set • What: Compile “climo” of TAMDAR icing data using RUC and CIP outputs • Why: Will help QC efforts – what are these reports, are they consistent with expected icing conditions, are we seeing inconsistencies? • Funded by: FAA
Laser senses 0.020” ice accreted here Yes: activates heating cycle to melt and start over again No: no ice detected Uncertain: Ttot >0C, Tstat <0C (ice won’t freeze onto probe)
CIP impact: progress • Converted TAMDAR data sets to pseudo PIREP NetCDF data • Determined HRCIP run times for study • Completed baseline verification using voice PIREPs and standard QAPDT methods
CIP concept Lightning Deep Convection m
PIREPs in CIP • Used as a boosting factor for icing potential (along with RUC SLW and VV) • Currently, only positive icing PIREPs are used: icepotfinal = icepotini(0.35*PIREPmap + .4*SLWmap + .25*VVmap) severity = 1-8 scale (T=1, H=8, etc.), PIREPmap = severity/8 and weigh by proximity in space and time Need to determine how to use negative TAMDAR icing data – decrease potential
CIP Comparison • Three-way comparison • Baseline: no TAMDAR • Add TAMDAR positive icing reports • Add TAMDAR negative icing reports • Compare PODy, PODn, area and volume covered • What is the effect on the statistics? On the look and feel?
TAMDAR Icing “Climo” • Use ASCII files for location of positive icing reports • Form climatology – time of day, location, by month, etc. Where is icing being reported? • Use matching hourly 20-km RUC forecasts to pull info on temperatures, RH, condensate • Can use positive TAMDAR icing data to “verify” RUC condensate fields • Use matching CIP icing potential to check our expectations on icing – positive and negative
Ice Accretion? • New icing severity definitions are accretion-rate based • Updated CIP severity • Accretion rate depends on object shape, airspeed, etc… • We’re interested in working with AIRDAT on this