Validation of Satellite Rainfall Products over South America Tufa Dinku 1 and Franklyn Ruiz 2

International Research Institute for Climate and Society

Validation of Satellite Rainfall ProductsValidation of Satellite Rainfall Products over South Americaover South America

Tufa DinkuTufa Dinku11 and Franklyn Ruiz and Franklyn Ruiz22

[email protected]

1. International Research Institute for Climate and Society (IRI) The Earth Institute at Columbia University

2. IDEAM, Bogotá, Colombia.

International Research Institute for Climate and Society (IRI)International Research Institute for Climate and Society (IRI)

The Earth Institute at Columbia University

mailto:[email protected]


OutlineOutline

• MotivationMotivation

• Validation region and dataValidation region and data

• Validation of monthly productsValidation of monthly products

• Validations of daily productsValidations of daily products

• SummarySummary


Over 300 datasets providing a thorough image of Earth’s past, present, and near-future climate

Air-SeaAir-Sea InterfaceInterfaceTopographic and Topographic and

Land Land CharacteristicsCharacteristics

AtmosphereAtmosphere

OceanographyOceanography

Radiation BudgetRadiation Budget

Seasonal ForecastsSeasonal Forecasts

Atmospheric IndicesAtmospheric Indices

Historical ModelHistorical Model SimulationsSimulations

HydrologyHydrology

Motivation: Motivation: The IRI Data LibraryThe IRI Data Libraryhttp://iridl.ldeo.columbia.edu/index.htmlhttp://iridl.ldeo.columbia.edu/index.html


Motivation: Motivation: Data LibraryData Library http://iridl.ldeo.columbia.edu/index.htmlhttp://iridl.ldeo.columbia.edu/index.html

• The data sets in the Data Library includes many operation/semi-The data sets in the Data Library includes many operation/semi-operational satellite rainfall productsoperational satellite rainfall products

• Allows users to extract data for specific time/space domain and Allows users to extract data for specific time/space domain and download it in different formatsdownload it in different formats

• Enables some basic statistical manipulations and downloading the Enables some basic statistical manipulations and downloading the resultsresults

• IRI uses these products for different projects over different parts IRI uses these products for different projects over different parts of the world, and also helps partners in developing countries to of the world, and also helps partners in developing countries to use the data use the data

• Thus, we have great interest in understanding the quality of these Thus, we have great interest in understanding the quality of these productsproducts


Validation over different regionsValidation over different regions

Current validation regionsCurrent validation regions

1.1. Ethiopia: Validation at spatial and temporal, scalesEthiopia: Validation at spatial and temporal, scales

2.2. Desert locust recession regions : Validation at daily time scale Desert locust recession regions : Validation at daily time scale and spatial resolution of 0.25-deg.and spatial resolution of 0.25-deg.

3.3. Zimbabwe: validation at of 0.25-degZimbabwe: validation at of 0.25-deg

4.4. Madagascar: Validation different temporal and spatial scalesMadagascar: Validation different temporal and spatial scales

5.5. Columbia: Validation at different temporal and spatial scalesColumbia: Validation at different temporal and spatial scales


Validation over ColumbiaValidation over Columbia


ColumbiaColumbia


Rainfall climatologyRainfall climatology(Source: Climate Atlas of Colombia)(Source: Climate Atlas of Colombia)


Raingauge dataRaingauge data

- Over 500 station obtained Over 500 station obtained from Columbia Met. Servicefrom Columbia Met. Service

- About 300 used after About 300 used after quality controlquality control

- Daily: 2003-2005Daily: 2003-2005

- Monthly: 1981-2005Monthly: 1981-2005

-used: 1998-2005used: 1998-2005

- Minimum 20 gauges (up to Minimum 20 gauges (up to 60) per 2.5-deg grid60) per 2.5-deg grid

- One gauges per 0.25 deg gridOne gauges per 0.25 deg grid


Validation of monthly products @ 2.5Validation of monthly products @ 2.5oo


Monthly @ 2.5-deg: Monthly @ 2.5-deg: All dataAll data

N=660N=660

TRMM-TRMM-3B433B43 CMAPCMAP

GPCP-GPCP-SGSG

GPCP-GPCP-MSMS

CCCC 0.770.77 0.710.71 0.750.75 0.770.77

BiasBias 1.001.00 0.970.97 1.101.10 1.091.09

MEME 0.80.8 -4.4-4.4 16.416.4 15.615.6

RMSRMS 33.733.7 43.943.9 37.237.2 36.736.7

EffEff 0.420.42 0.020.02 0.290.29 0.310.31


Monthly @ 2.5-deg: Monthly @ 2.5-deg: Western ColumbiaWestern Columbia

N=373N=373 TRMM-3B43TRMM-3B43 CMAPCMAPGPCP-GPCP-

MSMSGPCP-GPCP-

SGSG

CCCC 0.720.72 0.670.67 0.720.72 0.730.73

BiasBias 1.011.01 0.940.94 1.131.13 1.111.11

MEME 2.22.2 -10.0-10.0 23.223.2 19.119.1

RMSRMS 37.537.5 47.447.4 40.940.9 40.940.9

EffEff 0.220.22 -0.25-0.25 0.070.07 0.070.07


Monthly @ 2.5-deg: Monthly @ 2.5-deg: Eastern ColombiaEastern Colombia

N=287N=287TRMM-TRMM-

3B433B43 CMAPCMAPGPCP-GPCP-

MSMS GPCP-SGGPCP-SG

CCCC 0.850.85 0.780.78 0.810.81 0.840.84

BiasBias 0.990.99 1.021.02 1.041.04 1.071.07

MEME -1.3-1.3 2.92.9 7.17.1 10.810.8

RMSRMS 26.326.3 37.537.5 30.330.3 28.828.8

EffEff 0.670.67 0.340.34 0.570.57 0.610.61


Daily at 0.25 degreeDaily at 0.25 degree


Daily accumulation @ 0.25-degDaily accumulation @ 0.25-deg

GSMaPGSMaP PRSPRS NRLNRL 3B423B42 3B42RT3B42RT CMORPHCMORPH

CorrCorr 0.180.18 0.360.36 0.410.41 0.480.48 0.440.44 0.150.15

EffEff -0.16-0.16 -8.41-8.41 -0.30-0.30 0.170.17 -0.23-0.23 -0.62-0.62

BiasBias 0.490.49 3.803.80 1.171.17 0.830.83 1.031.03 1.021.02

MEME -2.84-2.84 15.5115.51 0.920.92 -0.97-0.97 0.160.16 0.110.11

MAEMAE 5.905.90 18.8318.83 6.586.58 5.175.17 6.066.06 7.697.69

CSICSI 0.390.39 0.490.49 0.510.51 0.540.54 0.520.52 0.420.42

PODPOD 0.490.49 0.790.79 0.720.72 0.740.74 0.690.69 0.630.63

FARFAR 0.350.35 0.430.43 0.370.37 0.340.34 0.320.32 0.440.44

ETSETS 0.190.19 0.210.21 0.260.26 0.300.30 0.300.30 0.160.16

HKSHKS 0.300.30 0.370.37 0.420.42 0.470.47 0.460.46 0.270.27

HSSHSS 0.310.31 0.350.35 0.410.41 0.470.47 0.460.46 0.270.27


Hourly accumulation @ 0.25-degHourly accumulation @ 0.25-deg


SummarySummary

• Validation over region of complex topography and Validation over region of complex topography and VERY high spatial rainfall variabilityVERY high spatial rainfall variability

• The performance of the products is poorer than what The performance of the products is poorer than what have been observed over another complex terrain.have been observed over another complex terrain.

• Poorer performance over western (wetter) part as Poorer performance over western (wetter) part as compared to the eastern parts compared to the eastern parts

• TRMM products seem to do relatively better at both TRMM products seem to do relatively better at both time/space scalestime/space scales

Validation of Satellite Rainfall Products over South America Tufa Dinku 1 and Franklyn Ruiz 2

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