NCAR Activities Using TAMDAR Icing Data Marcia K. Politovich, Jamie Braid Scott Landolt and Cory...
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Transcript of NCAR Activities Using TAMDAR Icing Data Marcia K. Politovich, Jamie Braid Scott Landolt and Cory...
NCAR Activities Using TAMDAR Icing Data
Marcia K. Politovich, Jamie Braid
Scott Landolt and Cory WolffNCAR 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
LightningDeep Convection
High-res (5 km) CIP
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
More ideas?