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CPC Unified Gauge – Satellite Merged CPC Unified Gauge – Satellite Merged Precipitation Analysis Precipitation Analysis
for Improved Monitoring and Assessments for Improved Monitoring and Assessments of Global Climate of Global Climate
Pingping Xie, Pingping Xie, Soo-Hyun Yoo, Robert Joyce, and Yelena YaroshSoo-Hyun Yoo, Robert Joyce, and Yelena Yarosh
2009.10.29.2009.10.29.
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CPC’s Unified Precipitation ProjectCPC’s Unified Precipitation Project
• Multiple precipitation analyses generated at CPC over the past ~20 years to satisfy various requirements
• Inconsistencies due to different input data and analysis procedures used
• A project is underway at CPC• 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.
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Components of the Unified ProductsComponents of the Unified Products
• Station reports
• Unified, quality controlled
• Satellite estimates
• Multiple satellites / multiple instruments / integrated
• Analyses
• Gauge-based; gauge-satellite merged
• Global / Regional ;
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Gauge Analysis of Global Daily PrecipitationGauge Analysis of Global Daily Precipitation
• Interpolation of gauge reports from ~30K stations• Optimal Interpolation (OI) with orographic correction (Xie et al. 2007)• Interpolated on 0.125olat/lon, then averaged on 0.5olat/lon grid over
global land for release
• Global fields from1979 to present updated daily on a real-time basis• CONUS analysis
from 1948 on 0.25olat/lon
• Example for July 1, 2003
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High-Resolution Satellite EstimatesHigh-Resolution Satellite Estimates
CMORPH : CPC Morphing technique (Joyce et al. 2004) Combined use of satellite PMW and IR data 8kmx8km / 60oS-60oN; 30-min interval / from September 2000 / Real-time Project on the way to back-extend the CMORPH to 1998 Sample for August 18, 2003
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Merging Gauge and Satellite Data [ 1 ]Merging Gauge and Satellite Data [ 1 ]
• Combining the strength of gauge and satellite data to produce a merged analysis with improved quality
• Gauge: accurate point measurements but sparse distribution
• Satellite: complete coverage but with bias and random error
• Bias-corrected Satellite Estimates over the Globe
– Correcting the bias and discontinuities in the CMORPH estimates
• over land – through matching the PDF of CMORPH against that of the gauge-
based analysis• Over ocean
– Adjusting the CMORPH to a long-term data set (pentad GPCP) to facilitate the definition of anomaly
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Merging Gauge and Satellite Data [ 2 ]Merging Gauge and Satellite Data [ 2 ]
• Sample bias-corrected Satellite Estimates
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Merging Gauge and satellite data [3]Merging Gauge and satellite data [3]
Comparison of satellite estimates with gauge data for Apr. – Sep., 2009
Bias is corrected almost completely over the global land;
Correlation for daily precipitation over 0.25olat/lon grid boxes is improved by ~0.05
Daily Gauge
CMORPH
Gauge-Adjusted CMORPH
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Merging Gauge and Satellite Data [ 4 ]Merging Gauge and Satellite Data [ 4 ]
• July 2005 Monthly Mean Precip at T382
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Merging Gauge and Satellite Data [ 5 ]Merging Gauge and Satellite Data [ 5 ]• July 2005 Diurnal Standard Deviation of Hourly Precip.
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Merging Gauge and Satellite Data [6]Merging Gauge and Satellite Data [6]
• Combining Bias-corrected Satellite Estimates with Daily gauge over the Several Regions
– This is only possible for several regions due to different daily ending time in the gauge reports
• Africa (06Z)• CONUS/MEX (12Z)• S. America (12Z)• Australia (00Z)• China (00Z)
– Combining the bias-corrected CMORPH with gauge observations through the Optimal Interpolation (OI) over selected regions where gauge observations have the same daily ending time
• in which the CMORPH and gauge data are used as the first guess and observations, respectively
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Merging Gauge and Satellite Data [ 7 ] Merging Gauge and Satellite Data [ 7 ] Example over ChinaExample over China
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Merging Gauge with Satellite Data [ 8 ] Merging Gauge with Satellite Data [ 8 ] Example over CONUSExample over CONUS
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Merging Gauge with Satellite Data [ 89] Merging Gauge with Satellite Data [ 89] Example over AfricaExample over Africa
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SummarySummary• Prototype algorithm is developed and test products are constructed for the gauge-satellite merged global precipitation analyses
• Two sets of gauge-satellite precipitation analyses • Bias-corrected Satellite Estimates
•Global •8kmx8km; 30-min •1998 to the present
• Gauge-satellite combined analyses •Regional •0.25olat/lon; daily •1998 to the present
• Unified gauge – satellite precipitation analyses useful for climate monitoring, model verifications, hydrological studies, et al.