Few Thoughts on Validation
Open ocean - virtually impossible
- Use of Pacific Atoll gauges (Morrissey)
- TOGA-COARE, etc.
- Acoustic/Optical devices
Validation Data “questionable”
- Radar best suited for passive microwave, but….
- Calibration issues
- Z-R relationships; factor of 2-3
- Gauges vs. satellite: point vs. average
Which parameters are most important?
- How do you assess “usefulness”?
- Bias, correlation, skill score…image interpretation
A LOT of “inconclusive” rainfall intercomparisons
- GPCP - AIP’s & NASA WetNet - PIP’s