June 12, 2009F. Iturbide-Sanchez MIRS F16 Rainfall Rate Overview and Validation F. Iturbide-Sanchez, K. Garrett, C. Grassotti, W. Chen, and S.-A. Boukabara.

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Presentation transcript:

June 12, 2009F. Iturbide-Sanchez MIRS F16 Rainfall Rate Overview and Validation F. Iturbide-Sanchez, K. Garrett, C. Grassotti, W. Chen, and S.-A. Boukabara

June 12, 2009F. Iturbide-Sanchez Outline I.MIRS Rainfall Rate Validation with TRMM Precipitation Radar-Based (TRMM-2B31) Product. a.F16 Rainfall Rate II.MIRS Rainfall Rate Validation with CPC Precipitation. a.Daily Composite Precipitation Estimate b.F16 Daily Precipitation Estimate

June 12, 2009F. Iturbide-Sanchez MIRS F16 Rainfall RateMIRS N18 Rainfall Rate F16 Rainfall Rate Compared to N18 Rainfall Rate Same regression algorithm (based on MSPPS) is used to derive F16 and N18 rainfall rate. Main differences are due to the different temporal and spatial coverage.

June 12, 2009F. Iturbide-Sanchez F16 Rainfall Rate (mm/hr)N18 Rainfall Rate (mm/hr) Comparison over Land based on nearly four months of Collocations with TRMM-2B31 F16 rainfall rate has shown comparable correlation, bias and standard deviation to N18 rainfall rate when compared to TRMM-2B31 Rainfall Rate over Land. Corr= nPts=7447 Bias= Stdv= Corr= nPts=12774 Bias= Stdv= TRMM-2B31 Rainfall Rate (mm/hr) F16 and N18 Rainfall Rate Compared to TRMM-2B31 Rainfall Rate Over Land 1/2

June 12, 2009F. Iturbide-Sanchez F16 Rainfall Rate (mm/hr)N18 Rainfall Rate (mm/hr) F16 and N18 rainfall rate show similar probability distribution of rainfall rate when compared to TRMM-2B31 Rainfall Rate over Land. Binsize=1.0 mm/hr Comparison over Land based on nearly four months of Collocations with TRMM-2B31 F16 and N18 Rainfall Rate Compared to TRMM-2B31 Rainfall Rate Over Land 2/2

June 12, 2009F. Iturbide-Sanchez F16 Rainfall Rate (mm/hr)N18 Rainfall Rate (mm/hr) F16 rainfall rate has shown comparable correlation, bias and standard deviation than N18 rainfall rate when compared to TRMM-2B31 Rainfall Rate over Ocean. Corr= nPts=23552 Bias= Stdv= Corr= nPts=34346 Bias= Stdv= Comparison over Ocean based on nearly four months of Collocations with TRMM-2B31 F16 and N18 Rainfall Rate Compared to TRMM-2B31 Rainfall Rate Over Ocean 1/2 TRMM-2B31 Rainfall Rate (mm/hr)

June 12, 2009F. Iturbide-Sanchez F16 and N18 rainfall rate show similar probability distribution of rainfall rate when compared to TRMM-2B31 Rainfall Rate over Ocean. F16 Rainfall Rate (mm/hr)N18 Rainfall Rate (mm/hr) Binsize=1.0 mm/hr Comparison over Ocean based on nearly four months of Collocations with TRMM-2B31 F16 and N18 Rainfall Rate Compared to TRMM-2B31 Rainfall Rate Over Ocean 2/2

June 12, 2009F. Iturbide-Sanchez II. MIRS Rainfall Rate Validation with CPC Precipitation.

June 12, 2009F. Iturbide-Sanchez CPC Gauge-Based Analysis Precipitation NOAA Climate Prediction Center (CPC) Gauge-Based Analysis of Global Daily Precipitation represents a unified precipitation product with consistent quantity and improved quality that combines all information sources (state networks, automatic stations, etc.) available at CPC. Number of CPC Gauge StationsCPC Daily Precipitation

June 12, 2009F. Iturbide-Sanchez CPC Precipitation Precipitation Estimate N18 Precipitation Estimate F16 Comparison Between Daily CPC Precipitation and Daily Precipitation Estimate from N18 and F16 Over North America 1/2

June 12, 2009F. Iturbide-Sanchez MIRS N18 vs CPC Precipitation MIRS F16 vs CPC Precipitation Corr= nPts=3893 Bias= Stdv= Corr= nPts=3893 Bias= Stdv= Comparison Between Daily CPC Precipitation and Daily Precipitation Estimate from N18 and F16 Over North America 2/2 F16 Precipitation Estimate shows correlation, bias and standard deviation comparable to N18 Precipitation Estimate relative to CPC Precipitation

June 12, 2009F. Iturbide-Sanchez Comparison Between MIRS and CPC Daily Precipitation Over North America Correlation between F16 Precipitation Estimate (PE) and CPC Precipitation is comparable to the correlation computed between CPC Precipitation and both N18 PE and MetopA PE. Composite Precipitation Estimate (N18, MetopA and F16) Precipitation Estimate From Single Sensor

June 12, 2009F. Iturbide-Sanchez MIRS Precipitation Estimate (Composite: N18, MetopA and F16) Precipitation Estimate N18 Precipitation Estimate MetopA Precipitation Estimate F16 Daily Precipitation Estimate From Single and Multiple Sensors (F16, MetopA and N18)

June 12, 2009F. Iturbide-Sanchez Comparison Between MIRS and CPC Daily Precipitation Over North America CPC PrecipitationMIRS Precipitation Estimate (Composite: N18, MetopA and F16) Comparisons between MIRS and CPC precipitation are being performed on a daily basis over North America. These comparisons have been performed daily for more than a month.

June 12, 2009F. Iturbide-Sanchez The F16 rainfall rate improves rainfall detection in the MIRS Composite Precipitation Estimate, without significantly affecting the number of false alarms. Comparison Between MIRS and CPC Daily Precipitation Over North America Contribution of F16 rainfall rate to MIRS Precipitation Estimate

June 12, 2009F. Iturbide-Sanchez Comparison Between MIRS and CPC Daily Precipitation Over North America F16 rainfall rate improves the correlation between MIRS Composite Precipitation Estimate and CPC Precipitation.

June 12, 2009F. Iturbide-Sanchez Conclusions From comparisons with TRMM-2B31, F16 Rainfall Rate performance over land and ocean is comparable to the N18 Rainfall Rate. As expected, the F16 Rainfall Rate distribution reproduces the properties of the MSPPS distribution. Addition of F16 Rainfall improves the probability of detection and correlation coefficient of the MIRS Composite Precipitation Estimate with respect to CPC precipitation. Validation results of F16 Rainfall Rate, which includes comparison with radar-based (TRMM-2B31), passive microwave-based (N18) and rain gauge (CPC precipitation) observations, have shown that F16 Rainfall Rate is a MIRS product ready for operations over land and ocean surface types. Finally, as shown in previous presentations, improvements to MIRS Rainfall Rate algorithm are in progress.

June 12, 2009F. Iturbide-Sanchez

June 12, 2009F. Iturbide-Sanchez Contribution of F16 Rainfall to the MIRS Composite Precipitation Estimate MIRS Precipitation Estimate: N18, MetopA and F16 MIRS Precipitation Estimate: N18 and MetopA

June 12, 2009F. Iturbide-Sanchez Comparison Between MIRS and CPC Precipitation Over North America