VALIDATION OF HIGH RESOLUTION PRECIPITATION PRODUCTS IN THE SOUTH OF BRAZIL WITH A DENSE GAUGE NETWO

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VALIDATION OF HIGH RESOLUTION PRECIPITATION
PRODUCTS IN THE SOUTH OF BRAZIL WITH A DENSE
GAUGE NETWORK AND WEATHER RADARS
FIRST RESULTS
Cesar Beneti, Leonardo Calvetti, Ieda Pscheidt,
Itamar Moreira Parana State Meteorological
Service - SIMEPAR Curitiba, Brazil Augusto J.
Pereira Filho Department of Atmospheric Sciences
University of Sao Paulo, Sao Paulo, Brazil
3rd Workshop of the International Precipitation
Working Group Melbourne
October 2006
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OBJECTIVES - Integrate rain gauge, radar and
satellite data to improve QPE - Assimilate QPEs
into operational NWP model - Use NWP QPF for
hydrological forecasting - Verify QPE, QPF
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SATELLITE ESTIMATES - Period Jan/2002
Mar/2006 - Area LAT 22S to 27S LON 56W
to 46W - Resolution 0.25deg - Accumulation
3hour - Techniques CMORPH, NRLB, PERSIANN,
TRMM3B42 Other Data Raingauge, Radar
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Importance of the Area More than 70 of GDP
(Gross Domestic Product) Major cities Sao
Paulo, Rio de Janeiro, Curitiba (gt 80million
people) Hydropower Generation in Parana
represents 30 Brazil 95
Paraguay Electric Energy in Brazil is gt85
Hydro-generation
Rio de Janeiro
SaoPaulo
Curitiba
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October 2006
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Precipitation in the area is related to MCS
(spring/summer) and Frontal Systems (all
year) Convection initiates mostly in late
afternoon, propagating eastward, with high
rainfall accumulation diurnal cycle well
defined.
(mm)
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• Hydromet information available in the area
  (approx. 200,000km²)
• - S-Band Doppler Weather Radar, with scans
• every 5 minutes, 4km2 resolution
• - 62 Automatic hydrological stations
  (precipitation and river level measurements)
  with 15min. observations
• - 37 Automatic meteorological stations (precip.
  T, Td, p, wind) with hourly observations
• - Satellite data processing system.
• - New automatic stations to be installed
  in 2006-2008 up to 140 points
• - Conventional gauges, daily accumulation
  over 50

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October 2006
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CLIMATOLOGY (SON)
mm
PRECIPITATION ANOMALIES
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October 2006
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CLIMATOLOGY (SON)
mm
PRECIPITATION ANOMALIES
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CLIMATOLOGY (DJF)
PRECIPITATION ANOMALIES
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CLIMATOLOGY (DJF)
PRECIPITATION ANOMALIES
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BIAS is for each grid point (.25deg x .25deg),
total period BIAS ltPsatgt - ltPgaugt
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Distribution is Number of events with precip
larger than a threshold for each 3hour period
Even distribution for Spring Diurnal cycle more
evident in Summer Differences for rain events
with higher precip.
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Working Group Melbourne
October 2006
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Distribution is Number of events with precip
larger than a threshold for each 3hour period
Even distribution for Spring Diurnal cycle more
evident in Summer Differences for rain events
with higher precip.
3rd Workshop of the International Precipitation
Working Group Melbourne
October 2006
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Distribution is Number of events with precip
larger than a threshold for each 3hour period
Even distribution for Spring Diurnal cycle more
evident in Summer Differences for rain events
with higher precip.
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Working Group Melbourne
October 2006
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Working Group Melbourne
October 2006
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Working Group Melbourne
October 2006
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Working Group Melbourne
October 2006
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Satellite precipitation estimations were compared
with rain gauge and river flow in a sub-basin of
Iguassu (area 24167 km²), upstream of the
first/largest reservoir, which is mainly
responsible for regulating the energy generation
in the cascade.
Iguassu Basin Area (67446 km2)
15 rain gauges, with river level and
precipitation measurements every 15minutes.
Evaluation Area (24167 km2)
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Correlation Coef. between streamflow and
precipitation (12hours lag)
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Correlation Coef. between streamflow and
precipitation (12hours lag)
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Monthly Precipitation Accumulation for Iguassu
Basin
Monthly accumulation for October 2005
Radar
Satellite
Gauge
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Working Group Melbourne
October 2006
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• Next Steps
• More statistics, different periods (spatial,
  categorical)
• Compare other satellite techniques (e.g. IRMW)
  with GaugeRadar (using Statistical Objective
  Analysis) data in the same area
• Compare CPC/NCEP 1DD with GaugeRadarSat data
  in the area for different periods of the year.

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Working Group Melbourne
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Thank You!
3rd Workshop of the International Precipitation
Working Group Melbourne
October 2006