Combining TRMM and Surface Observations of Precipitation: Technique and Validation over South America
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- 31 May 2010
- journal article
- research article
- Published by American Meteorological Society in Weather and Forecasting
- Vol. 25 (3), 885-894
- https://doi.org/10.1175/2010WAF2222325.1
Abstract
The measure of atmospheric model performance is highly dependent on the quality of the observations used in the evaluation process. In the particular case of operational forecast centers, large-scale datasets must be made available in a timely manner for continuous assessment of model results. Numerical models and surface observations usually work at distinct spatial scales (i.e., areal average in a regular grid versus point measurements), making direct comparison difficult. Alternatively, interpolation methods are employed for mapping observational data to regular grids and vice versa. A new technique (hereafter called MERGE) to combine Tropical Rainfall Measuring Mission (TRMM) satellite precipitation estimates with surface observations over the South American continent is proposed and its performance is evaluated for the 2007 summer and winter seasons. Two different approaches for the evaluation of the performance of this product against observations were tested: a cross-validation subsampling of the entire continent and another subsampling of only areas with sparse observations. Results show that over areas with a high density of observations, the MERGE technique's performance is equivalent to that of simply averaging the stations within the grid boxes. However, over areas with sparse observations, MERGE shows superior results.Keywords
This publication has 9 references indexed in Scilit:
- Statistical Evaluation of Combined Daily Gauge Observations and Rainfall Satellite Estimates over Continental South AmericaJournal of Hydrometeorology, 2009
- Validation of TRMM precipitation radar monthly rainfall estimates over BrazilJournal of Geophysical Research: Atmospheres, 2009
- Regional Eta model experiments: SALLJEX and MCS developmentJournal of Geophysical Research: Atmospheres, 2008
- The TRMM Multisatellite Precipitation Analysis (TMPA): Quasi-Global, Multiyear, Combined-Sensor Precipitation Estimates at Fine ScalesJournal of Hydrometeorology, 2007
- Evaluation of model‐derived and remotely sensed precipitation products for continental South AmericaJournal of Geophysical Research: Atmospheres, 2006
- Sensitivity of Precipitation Forecast Skill Scores to Bilinear Interpolation and a Simple Nearest-Neighbor Average Method on High-Resolution Verification GridsWeather and Forecasting, 2003
- The Status of the Tropical Rainfall Measuring Mission (TRMM) after Two Years in OrbitJournal of Applied Meteorology and Climatology, 2000
- Interpolation methods comparisonComputers & Mathematics with Applications, 1998
- An Interactive Barnes Objective Map Analysis Scheme for Use with Satellite and Conventional DataJournal of Climate and Applied Meteorology, 1983