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Validation of Satellite Rainfall Products over South America Tufa Dinku 1 and Franklyn Ruiz 2 tufa@iri.columbia.edu International Research Institute for Climate and Society (IRI) The Earth Institute at Columbia University 2. IDEAM, Bogotá, Colombia.

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slide1

Validation of Satellite Rainfall Products

over South America

Tufa Dinku1 and Franklyn Ruiz2

tufa@iri.columbia.edu

  • 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)

The Earth Institute at Columbia University

International Research Institute for Climate and Society

outline
Outline
  • Motivation
  • Validation region and data
  • Validation of monthly products
  • Validations of daily products
  • Summary

International Research Institute for Climate and Society

motivation the iri data library http iridl ldeo columbia edu index html
Motivation: The IRI Data Libraryhttp://iridl.ldeo.columbia.edu/index.html

Over 300 datasets providing a thorough image of

Earth’s past, present, and near-future climate

Air-SeaInterface

Topographic and Land

Characteristics

Historical ModelSimulations

Hydrology

Atmosphere

Radiation Budget

Atmospheric Indices

Oceanography

Seasonal Forecasts

International Research Institute for Climate and Society

motivation data library http iridl ldeo columbia edu index html
Motivation: Data Libraryhttp://iridl.ldeo.columbia.edu/index.html
  • The data sets in the Data Library includes many operation/semi-operational satellite rainfall products
  • Allows users to extract data for specific time/space domain and download it in different formats
  • Enables some basic statistical manipulations and downloading the results
  • IRI uses these products for different projects over different parts of the world, and also helps partners in developing countries to use the data
  • Thus, we have great interest in understanding the quality of these products

International Research Institute for Climate and Society

slide5

Validation over different regions

Current validation regions

  • Ethiopia: Validation at spatial and temporal, scales
  • Desert locust recession regions : Validation at daily time scale and spatial resolution of 0.25-deg.
  • Zimbabwe: validation at of 0.25-deg
  • Madagascar: Validation different temporal and spatial scales
  • Columbia: Validation at different temporal and spatial scales

International Research Institute for Climate and Society

validation over columbia
Validation over Columbia

International Research Institute for Climate and Society

columbia
Columbia

International Research Institute for Climate and Society

rainfall climatology source climate atlas of colombia
Rainfall climatology(Source: Climate Atlas of Colombia)

International Research Institute for Climate and Society

raingauge data
Raingauge data
  • Over 500 station obtained from Columbia Met. Service
      • About 300 used after quality control
    • Daily: 2003-2005
    • Monthly: 1981-2005
      • used: 1998-2005
    • Minimum 20 gauges (up to 60) per 2.5-deg grid
    • One gauges per 0.25 deg grid

International Research Institute for Climate and Society

validation of monthly products @ 2 5 o
Validation of monthly products @ 2.5o

International Research Institute for Climate and Society

monthly @ 2 5 deg all data
Monthly @ 2.5-deg: All data

International Research Institute for Climate and Society

monthly @ 2 5 deg western columbia
Monthly @ 2.5-deg: Western Columbia

International Research Institute for Climate and Society

monthly @ 2 5 deg eastern colombia
Monthly @ 2.5-deg: Eastern Colombia

International Research Institute for Climate and Society

daily at 0 25 degree
Daily at 0.25 degree

International Research Institute for Climate and Society

daily accumulation @ 0 25 deg
Daily accumulation @ 0.25-deg

International Research Institute for Climate and Society

hourly accumulation @ 0 25 deg
Hourly accumulation @ 0.25-deg

International Research Institute for Climate and Society

summary
Summary
  • Validation over region of complex topography and VERY high spatial rainfall variability
  • The performance of the products is poorer than what have been observed over another complex terrain.
  • Poorer performance over western (wetter) part as compared to the eastern parts
  • TRMM products seem to do relatively better at both time/space scales

International Research Institute for Climate and Society