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CPC Unified Gauge-Based Analysis of Global Daily Precipitation

This research paper discusses the development of a unified gauge-based analysis of global daily precipitation by the CPC, aiming to improve accuracy and reliability through the integration of multiple data sources and advanced techniques.

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CPC Unified Gauge-Based Analysis of Global Daily Precipitation

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  1. CPC Unified Gauge-Based Analysis of Global Daily PrecipitationPingping Xie, Mingyue Chen, Wei Shi and CPC Working Group on Precipitation2008.01.09.

  2. Background Multiple precipitation analyses generated at CPC over the past ~20 years to satisfy various requirements Inconsistencies in CPC precipitation analysis products are due to differences in: Input data; Quality control; Objective algorithms.

  3. The CPC Unified Precipitation Products Project To create a single suite of unified precipitation products for global / regional applications. To increase the accuracy, reliability and quantitative consistency of the new products.

  4. Components of the Unified Products Station reports Unified, quality controlled Satellite estimates Multiple satellites / multiple instruments Analyses Global / regional; Daily / Pentad / Monthly / hourly; Retrospective / Real-time

  5. Precipitation Analyses Gauge-based and gauge-satellite merged analyses Gauge-based analysis of global daily precip Gauge-based analysis of hourly precip over CONUS Gauge-satellite merged analysis of global daily precip. … State-of-the-art objective techniques Optimize available gauge and satellite observations Satisfying most requirements inside/outside CPC

  6. Gauge-Based Analysisof Global Daily Precipitation QCed daily reports from >30K stations Enhanced networks over US, Mexico, S. America, Australia GTS elsewhere Optimal Interpolation (OI) with some orographic consideration 0.5olat/lon grid over global land Daily fields from 1979 to present Real-time operations

  7. Distribution of Reporting Stationsfor July 1, 2003 • Daily reports from over 30,000 stations worldwide • Distributed unevenly with more gauges over US, Brazil, Australia, and Europe • Gauge reports available only from <400 Indian stations through GTS

  8. Example of Gauge-based Analysisfor July 1, 2003 • Major precipitation activities well depicted with reasonable details

  9. Differenceswith the Previous Gauge Analyses GTS-based global daily analysis GTS gauge only (~6000 gauges) Interpolation algorithm of Shepard (1968) Regional gauge analyses Interpolation algorithm of Cressman (1959) Grid size CMAP Gauge-satellite merged product Monthly / pentad products on 2.5olat/lon grid GTS gauge-based analysis merged with satellite estimates over land

  10. Existing Comparisonwith Existing Analyses • January 8, 1998; • The new analysis presents finer structure in better agreements with station data; New

  11. Comparison with Existing Analyses January 8, 1998 Existing New Station

  12. On the Way Gauge-satellite (CMORPH) merged analysis Gauge-based analysis of hourly precipitation over CONUS Back extension of gauge daily analysis to 1948 for regions with data (US, Brazil, Australia…)

  13. Summary Gauge-based analysis of global daily precip for 1979 to present available for NCEP internal use Welcome comments, feedbacks, and interactions toward improved precipitation products

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