Slide sem ttulo

1
AN INTERCOMPARISON OF GAUGE, RADAR AND SATELLITE
RAINFALL IN THE TROPICS A. J. Pereira
Filho1, A. Negri2 and P. T. Nakayama3 1USP,
São Paulo, Brazil 2NASA/GSFC, MD, USA 3DAEE, São
Paulo, Brazil
2
STUDY AREA
3
GAUGE DATA
ACCUMULATION 1000 UTC - 1000 UTC
4
5 Minutes Scans 3-km CAPPI 4-bit Rainfall
Rates 2-km x 2-km Resolution
SPWR DATA
5
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
SATELLITE DATA
6
GAUGE X RADAR
7
GAUGE X RADAR
G Gauge Mean RG Buck Ratio RI Mean Ratio
8
GAUGE X RADAR X SATELLITE
9
GAUGE X RADAR X SATELLITE
10
RADAR X SATELLITE Highest r
11
RADAR X SATELLITE Highest -r
12
RADAR X SATELLITE Highest Difference
13
RADAR X SATELLITE Stratiform
14
RADAR X SATELLITE Maximum Areal Mean
15
RADAR X SATELLITE Sampling and 2-bit Info
Content
16
RADAR X SATELLITE Total Rainfall
1 Ground Clutter Filtering (2 and 3) 4 Grind
Clutter Contamination 5 Range Effect 7 Signal
Processing
17
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