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An Improved Gridded Historical Daily Precipitation Analysis for Brazil

Authors :
Viviane B. S. Silva
Vernon E. Kousky
Wei Shi
R. Wayne Higgins
Source :
Journal of Hydrometeorology. 8:847-861
Publication Year :
2007
Publisher :
American Meteorological Society, 2007.

Abstract

A gauge-only precipitation data quality control and analysis system has been developed for monitoring precipitation at NOAA’s Climate Prediction Center (CPC). Over the past 10 yr the system has been used to develop and deliver many different precipitation products over the United States, Mexico, and Central and South America. Here the authors describe how the system has been applied to develop improved gridded daily precipitation analyses over Brazil. Consistent with previous studies, comparisons between the the gridded analyses and station observations reveal fewer dry days, a greater number of low precipitation days, and fewer extreme precipitation events in the gridded analyses. Even though the gridded analysis system reduces the number of dry days and increases the number of wet days, there is still a good correlation between time series of the gridpoint precipitation values and observations. Retrospective analyses are important for computing basic statistics such as mean daily/monthly rainfall, extremes, and probabilities of wet and dry days. The CPC gridded precipitation analyses can be used in hydrologic and climate variability studies dealing with large spatial-scale anomaly patterns, such as those related to ENSO. The analyses can also be used as a benchmark for evaluating model simulations, serve as a basis for real-time monitoring, and provide statistics on the occurrence of large-scale heavy rainfall events and dry periods.

Details

ISSN :
15257541 and 1525755X
Volume :
8
Database :
OpenAIRE
Journal :
Journal of Hydrometeorology
Accession number :
edsair.doi...........3b6c1ee9d5dd84ab5044581e0cf6c0ed
Full Text :
https://doi.org/10.1175/jhm598.1