Validation of TRMM Radar Rainfall Data over Major Climatic Regions in Africa

Abstract The Global Precipitation Climatology Center global-precipitation-analyses rain gauge data have been used to validate the Tropical Rainfall Measuring Mission (TRMM) precipitation radar (PR) data over the major climatic regions in Africa. The threshold-matched precipitation index and the TRMM-and-other-sources “best-estimate” data (3B43) have also been compared with rain gauge data and with the TRMM PR rainfall product. In the 36-month climatological assessment of the satellite products at a grid spacing of 1.0°, continental Africa has been categorized into five distinct climatic regions: arid, semiarid, savanna, tropical wet, and the South Atlantic Ocean. Zonal mean analysis shows that TRMM PR has a large overestimation in the tropical-rain-forest region of Africa in December–January–February and in March–April–May. The bias is minimized in June–July–August and September–October–November. Bias is generally high for all algorithms in the dry seasons when rainfall is minimal but is less pronounced i...

[1]  A. Chang,et al.  Nonsystematic Errors of Monthly Oceanic Rainfall Derived from SSM/I , 1999 .

[2]  Dong-Bin Shin,et al.  A Summary of Reflectivity Profiles from the First Year of TRMM Radar Data , 2000 .

[3]  U. Schneider,et al.  Terrestrial Precipitation Analysis: Operational Method and Required Density of Point Measurements , 1994 .

[4]  J. Janowiak,et al.  The Global Precipitation Climatology Project (GPCP) combined precipitation dataset , 1997 .

[5]  T. N. Krishnamurti,et al.  The status of the tropical rainfall measuring mission (TRMM) after two years in orbit , 2000 .

[6]  Phillip A. Arkin,et al.  Analyses of Global Monthly Precipitation Using Gauge Observations, Satellite Estimates, and Numerical Model Predictions , 1996 .

[7]  Alfred T. C. Chang,et al.  Retrieval of Monthly Rainfall Indices from Microwave Radiometric Measurements Using Probability Distribution Functions , 1991 .

[8]  J. Susskind,et al.  Global Precipitation at One-Degree Daily Resolution from Multisatellite Observations , 2001 .

[9]  B. Kedem,et al.  Variability of Space–Time Mean Rain Rate , 1997 .

[10]  K. Okamoto,et al.  Rain profiling algorithm for the TRMM precipitation radar , 1997, IGARSS'97. 1997 IEEE International Geoscience and Remote Sensing Symposium Proceedings. Remote Sensing - A Scientific Vision for Sustainable Development.

[11]  Robert A. Houze,et al.  Comparison of Radar Data from the TRMM Satellite and Kwajalein Oceanic Validation Site , 2000 .

[12]  Russell L. Martin,et al.  Sampling errors for satellite-derived tropical rainfall - Monte Carlo study using a space-time stochastic model , 1990 .

[13]  U. Schneider,et al.  Global precipitation estimates based on a technique for combining satellite-based estimates, rain gauge analysis, and NWP model precipitation information , 1995 .

[14]  George J. Huffman,et al.  Estimates of Root-Mean-Square Random Error for Finite Samples of Estimated Precipitation , 1997 .

[15]  David A. Short,et al.  Rain estimation from satellites: Effect of finite field of view , 1990 .

[16]  Benjamin Kedem,et al.  Estimation of mean rain rate: Application to satellite observations , 1990 .

[17]  Christian D. Kummerow,et al.  Beamfilling Errors in Passive Microwave Rainfall Retrievals. , 1998 .

[18]  G. North,et al.  Error Analysis for Some Ground Validation Designs for Satellite Observations of Precipitation , 1999 .

[19]  O. O. Ilesanmi.  An Empirical Formulation of an ITD Rainfall Model for the Tropics: A Case Study of Nigeria , 1971 .

[20]  U. Schneider,et al.  Comparison of raingauge analyses, satellite-based precipitation estimates and forecast model results , 1996 .

[21]  John E. Janowiak,et al.  Sampling-Induced Conditional Biases in Satellite Climate-Scale Rainfall Estimates , 1996 .

[22]  V. Kousky.  Diurnal Rainfall Variation in Northeast Brazil , 1980 .

[23]  P. Xie,et al.  An Intercomparison of Gauge Observations and Satellite Estimates of Monthly Precipitation , 1995 .

[24]  Statistical Adjustment of Satellite Microwave Monthly Rainfall Estimates over Amazonia , 1999 .

[25]  Dong-Bin Shin,et al.  Errors Incurred in Sampling a Cyclostationary Field , 2000 .

[26]  Emmanouil N. Anagnostou,et al.  Uncertainty Quantification of Mean-Areal Radar-Rainfall Estimates , 1999 .

[27]  H. M. Goodman,et al.  The First WetNet Precipitation Intercomparison Project (PIP-1) , 1994 .

[28]  David A. Short,et al.  The beam filling error in the Nimbus 5 electronically scanning microwave radiometer observations of Global Atlantic Tropical Experiment rainfall , 1990 .

[29]  Robert F. Adler,et al.  On the Tropical Rainfall Measuring Mission (TRMM) , 1996 .

[30]  Dong-Bin Shin,et al.  Comparison of the Monthly Precipitation Derived from the TRMM Satellite , 2001 .