2.ESTIMATION – Microwave data

Internationalconstellation ofmicrowave sensors isuncoordinated• Old satellites drift• But still useful!

HRPP’s use “all” sensors

• Timing of version changes for both input and HRPP algorithms

• Sensor degradation

CDR-like GPCP• Limit microwave

calibrator to 6 a.m./ p.m. satellite

• Consistent diurnal bias

2.ESTIMATION – Microwave data

Internationalconstellation ofmicrowave sensors isuncoordinated• Old satellites drift• But still useful!

HRPP’s use “all” sensors

• Timing of version changes for both input and HRPP algorithms

• Sensor degradation

CDR-like GPCP• Limit microwave

calibrator to 6 a.m./ p.m. satellite

• Consistent diurnal bias

2.ESTIMATION – Microwave data

Internationalconstellation ofmicrowave sensors isuncoordinated• Old satellites drift• But still useful!

HRPP’s use “all” sensors

• Timing of version changes for both input and HRPP algorithms

• Sensor degradation

CDR-like GPCP• Limit microwave

calibrator to 6 a.m./ p.m. satellite

• Consistent diurnal bias

3. CURRENT ISSUES – Combination errors

Need to estimate bias outside usual validation areas• Very resistant to solution

Need to estimate HRPP random error• Depends on weather regimes• Time/space covariance structure

• real• retrieval

Account for diverse interleaved sources• Graphic looks

better than the real situation

orange = best microwave ± 1 hr

green = other microwave ± 1 hr

3. CURRENT ISSUES – Combination errors

Need to estimate bias outside usual validation areas• Very resistant to solution

Need to estimate HRPP random error• Depends on weather regimes• Time/space covariance structure

• real• retrieval

Account for diverse interleaved sources• Graphic looks

better than the real situation

orange = best microwave ± 1 hr

green = other microwave ± 1 hr

3. CURRENT ISSUES – Combination errors

Need to estimate bias outside usual validation areas• Very resistant to solution

Need to estimate HRPP random error• Depends on weather regimes• Time/space covariance structure

• real• retrieval

Account for diverse interleaved sources• Graphic looks

better than the real situation

orange = best microwave ± 1 hr

green = other microwave ± 1 hr