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TAbMEP Assessment: POLARCAT H2O Measurements
Assessment SummaryTable 1. Recommended POLARCAT H2O measurement treatmenta The PI reported uncertainty was recommended because no IEIP precision value could be calculated for the ATR-42 Falcon data

AircraftInstrumentReported 2 UncertaintyRecommended Bias CorrectionRecommended 2 UncertaintyNASA DC-8DLH5%-0.0562 - 0.00082 H2ODC8{(-0.0562 - 0.00082 H2O)2 + (.07)2}1/2NOAA WP-3DAOC5%- 0.0491 - 0.0950 H2OWP3D{(- 0.0491 - 0.0950 H2O)2 + (0.308)2}1/2NASA P-3B10%- 0.0903 + 0.0275 H2OP3B{(- 0.0903 + 0.0275 H2O)2 + (.834)2}1/2DLR FALCON10%- 0.0724 + 0.0673 H2ODLR{(- 0.0724 + 0.0673 H2O)2 + (0.166)2}1/2ATR-42 FALCON10%0.275 - 0.0130 H2OATR4210%a
Assessment Summary Cont.Only the DC-8 vs. DLR Falcon intercomparison meets the condition that 90% of data fall within the 2 uncertainty bounds, making it a TAbMEP unified data setRemaining intercomparisons contain systematic error that cannot be fully accounted for in uncertainty calculations, causing the recommended uncertainties to be insufficient for TAbMEP unified data set requirements

Table 2. TAbMEP unified data sets

IntercomparisonData Within the Recommended Uncertainty DC-8 vs. WP-3D45%DC-8 vs. P-3D62%DC-8 vs. DLR94%DLR vs. ATR-4276%
Assessment Summary Cont.Table 3. POLARCAT H2O bias estimates

Aircraft InstrumentApparent Bias (a g/kg + b H2O)Best Estimate Bias (a g/kg + b H2O)NASA DC-8DLH0-0.0562 - 0.00082 H2ODC8NOAA WP-3DAOC0.00649 - 0.0861 H2ODC8- 0.0491 - 0.0950 H2OWP3DNASA P-3B- 0.0351+ 0.0291 H2ODC8- 0.0903 + 0.0275 H2OP3BDLR FALCON- 0.0174 + 0.0731 H2ODC8- 0.0724 + 0.0673 H2ODLRATR-42 FALCON0.327 - 0.0118 H2ODC80.275 - 0.0130 H2OATR42
Assessment Summary Cont.Table 4. POLARCAT H2O precision (1) comparisons

FlightPlatformIEIP PrecisionExpected VariabilityObserved VariabilityAdjusted Precision4/12DC-82.2%15.6%2.2%WP-3D15.4%4/8DC-81.5%12.5%1.5%P-3B12.4%4/19DC-83.5%41.8%3.5%P-3B41.7%7/10DC-82.5%7.85%2.5%P-3B7.4%7/9DC-82.5%8.66%2.5%DLR Falcon8.3%4/15P-3B9.63%WP-3D7/14DLR Falcon20.5%ATR-42 Falcon
P-3B vs. DC-8
P-3B vs. DC-8 04/08/2008
DC-8 04/08/2008IEIP = 1.5%
DC-8 04/08/2008STD = 0.0022 g/kg
P-3B vs. DC-8 04/08/2008
P-3B vs. DC-8 04/08/2008
P-3B vs. DC-8 04/08/2008
P-3B vs. DC-8 04/19/2008
DC-8 04/19/2008IEIP = 3.5%
DC-8 04/19/2008STD = 0.0045 g/kg
P-3B vs. DC-8 04/19/2008
P-3B vs. DC-8 04/19/2008
P-3B vs. DC-8 04/19/2008
P-3B vs. DC-8 07/10/2008
P-3B vs. DC-8 07/10/2008
DC-8 07/10/2008IEIP = 2.5%
DC-8 07/10/2008STD = 0.0050 g/kg
P-3B vs. DC-8 07/10/2008
P-3B vs. DC-8 07/10/2008
P-3B vs. DC-8 07/10/2008
P-3B vs. DC-8 All Flights
P-3B vs. DC-8 All Flights
P-3B vs. DC-8 All Flights
WP-3D vs. DC-8 04/12/2008
WP-3D vs. DC-8 04/12/2008
DC-8 04/12/2008IEIP = 2.2%
DC-8 04/12/2008STD = 0.0030 g/kg
WP-3D vs. DC-8 04/12/2008
WP-3D vs. DC-8 04/12/2008
WP-3D vs. DC-8 04/12/2008
P-3B vs. WP-3D 04/15/2008
P-3B vs. WP-3D 04/15/2008
P-3B vs. WP-3D 04/15/2008
P-3B vs. WP-3D 04/15/2008
P-3B vs. WP-3D 04/15/2008
DLR Falcon vs. DC-8 07/09/2008
DLR Falcon vs. DC-8 07/09/2008
DC-8 07/09/2008IEIP = 2.5%
DC-8 07/09/2008STD = 0.0050 g/kg
DLR Falcon vs. DC-8 07/09/2008
DLR Falcon vs. DC-8 07/09/2008
DLR Falcon vs. DC-8 07/09/2008
DLR Falcon vs. ATR-42 Falcon 07/14/2008
DLR Falcon vs. ATR-42 Falcon 07/14/2008
DLR Falcon vs. ATR-42 Falcon 07/14/2008
DLR Falcon vs. ATR-42 Falcon 07/14/2008
DLR Falcon vs. ATR-42 Falcon 07/14/2008
DLR Falcon vs. ATR-42 Falcon 07/14/2008