WORKSHOP ON PRECIPITATION MEASUREMENTS MADRID 23-27 SEPTEMBER 2002 AN INTERCOMPARISON OF GAUGE, RADAR AND SATELLITE RAINFALL IN THE TROPICS A. J. Pereira.

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Presentation transcript:

WORKSHOP ON PRECIPITATION MEASUREMENTS MADRID SEPTEMBER 2002 AN INTERCOMPARISON OF GAUGE, RADAR AND SATELLITE RAINFALL IN THE TROPICS A. J. Pereira Filho 1, A. Negri 2 and P. T. Nakayama 3 1 USP, São Paulo, Brazil 2 NASA/GSFC, MD, USA 3 DAEE, São Paulo, Brazil

WORKSHOP ON PRECIPITATION MEASUREMENTS MADRID SEPTEMBER 2002 STUDY AREA

WORKSHOP ON PRECIPITATION MEASUREMENTS MADRID SEPTEMBER 2002 GAUGE DATA ACCUMULATION 1000 UTC UTC

WORKSHOP ON PRECIPITATION MEASUREMENTS MADRID SEPTEMBER 2002 SPWR DATA 5 Minutes Scans 3-km CAPPI 4-bit Rainfall Rates 2-km x 2-km Resolution

WORKSHOP ON PRECIPITATION MEASUREMENTS MADRID SEPTEMBER 2002 SATELLITE DATA GOES-East IR 30 Minute Scans 2-bit Rainfall Rates (CST) 0.0, 2.6 and 18.9 mm h -1 4-km x 4-km Resolution

WORKSHOP ON PRECIPITATION MEASUREMENTS MADRID SEPTEMBER 2002 GAUGE X RADAR

WORKSHOP ON PRECIPITATION MEASUREMENTS MADRID SEPTEMBER 2002 GAUGE X RADAR G = Gauge Mean RG = Buck Ratio RI = Mean Ratio

WORKSHOP ON PRECIPITATION MEASUREMENTS MADRID SEPTEMBER 2002 GAUGE X RADAR X SATELLITE

WORKSHOP ON PRECIPITATION MEASUREMENTS MADRID SEPTEMBER 2002 GAUGE X RADAR X SATELLITE

WORKSHOP ON PRECIPITATION MEASUREMENTS MADRID SEPTEMBER 2002 RADAR X SATELLITE Highest + 

WORKSHOP ON PRECIPITATION MEASUREMENTS MADRID SEPTEMBER 2002 RADAR X SATELLITE Highest - 

WORKSHOP ON PRECIPITATION MEASUREMENTS MADRID SEPTEMBER 2002 RADAR X SATELLITE Highest Difference

WORKSHOP ON PRECIPITATION MEASUREMENTS MADRID SEPTEMBER 2002 RADAR X SATELLITE Stratiform

WORKSHOP ON PRECIPITATION MEASUREMENTS MADRID SEPTEMBER 2002 RADAR X SATELLITE Maximum Areal Mean

WORKSHOP ON PRECIPITATION MEASUREMENTS MADRID SEPTEMBER 2002 RADAR X SATELLITE Sampling and 2-bit Info Content

WORKSHOP ON PRECIPITATION MEASUREMENTS MADRID SEPTEMBER 2002 RADAR X SATELLITE Total Rainfall 1 = Ground Clutter Filtering (2 and 3) 4 = Grind Clutter Contamination 5 = Range Effect 7 = Signal Processing

WORKSHOP ON PRECIPITATION MEASUREMENTS MADRID SEPTEMBER 2002 CONCLUSION Large rainfall events have relative small spatial variance Small rainfall events have relative large spatial variance Differences Radar x Satellite 70% due to phase Satellite less susceptible to systematic errors Limitations: Satellite: Information content and sampling Radar: Electronics, ground clutter, range effect,... Gauge: Representativity Next Step: Integration

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