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Acronyms
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Acronym | Definition |
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| AIRS | Atmospheric Infrared Sounder | | AMSU | Advanced Microwave Sounding Unit | ATBD | Algorithm Theoretical Basis Document | | AVHRR | Advanced Very High Resolution Radiometer | | C-ATBD | Climate Algorithm Theoretical Basis Document | C3S | Copernicus Climate Change Service | CDR | Climate Data Record | CDRP | Climate Data Record Program | CDS | Climate Data Store | CNR | Consiglio Nazionale delle Ricerche (National Research Council of Italy) | | CPR | Cloud-Profiling Radar | | cRMSD | Bias-corrected RMSD | | DMSP | Defense Meteorological Satellite Program | | DPR | Dual-frequency Precipitation Radar | DWD | Deutscher Wetterdienst (Germany's National Meteorological Service) | | EO | Earth Observation | | FCDR | Fundamental Climate Data Record | GCOS | Global Climate Observing System | | GMS | Geostationary Meteorological Satellite | | GOES | Geostationary Operational Environmental Satellite | GPCC | Global Precipitation Climatology Centre | GPCP | Global Precipitation Climatology Project | | GPI | GOES Precipitation Index | GPM | Global Precipitation Measurement mission | | GPROF | Goddard Profiling Algorithm | ICDR | Interim Climate Data Record | | IR | Infra-red | ISAC | Istituto di Scienze dell'Atmosfera e del Clima (Institute of Atmospheric Science and Climate) | | JAXA | Japanese Aerospace Exploration Agency | KPI | Key Performance Indicator | | METEOSAT | Meteorological Satellite | | MHS | Microwave Humidity Sounder | | MTSAT | Multifunction Transport Satellite | | MW | Microwave | | NASA | National Aeronautics and Space Administration | NOAA | National Oceanic and Atmospheric Administration | | OLR | Outgoing Longwave Radiation | | OPI | Outgoing Longwave Radiation Precipitation Index | PUGS | Product User Guide and Specification | | RMSD | Root-mean-squared deviation | | SSMI | Special Sensor Microwave Imager | | SSMIS | Special Sensor Microwave Imager Sounder | TCDR | Thematic Climate Data Record | | TIROS | Television and InfraRed Observation Satellite | TMPA | TRMM Multi-satellite Precipitation Analysis | | TMPI | Threshold-matched Precipitation Index | | TOVS | TIROS Operational Vertical Sounder | | TRGAD | Target Requirements and Gap Analysis Document | TRMM | Tropical Rainfall Measurement Mission | UMD | University of Maryland |
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More details on the estimation of these parameters are given inthe Report on Updated KPIs (D4, e.g. section 2.1).
Scope of the document
This document provides relevant information on requirements and gaps for the Precipitation GPCP TCDR v1.0 and ICDR v1.x. It is divided into three parts. Part 1 describes the product the present document refers to. Part 2 provides the target requirements for the product. Part 3 provides a past, present, and future gap analysis for the product and covers both gaps in the data availability and scientific gaps that could be addressed by further research activities (outside C3S).
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For the GPCP ICDR v1.x, we adopt the strategy outlined in the Report on Updated KPIs [D4](D4, e.g. section 3 and 4.2.2), i.e., the ICDR targets for accuracy are based on percentiles in the respective TCDR’s spatially averaged accuracy. With the monthly TMPA 3B43 product (TRMM, 2011) as reference dataset, the targeted upper and lower bounds for differences of spatial averages over low- to mid-latitudes (±50°) of the GPCP ICDR precipitation fields are 0.189 mm/d and -0.175 mm/d, respectively. For the daily GPCP ICDR (reference dataset: daily TMPA 3B42 product; Goddard Earth Sciences Data and Information Services Center, 2016), the bounds are 0.343 mm/d and -0.332 mm/d. The respective PQAR [D5] contains the details of the analysis of the percentiles of the TCDR performance against the TMPA products.
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Note that according to the Report on Updated KPIs [D4](D4, e.g. section 3 and 4.2.2), the GPCP ICDR needs to be inside the above upper and lower bounds in 95% of all available time slices, which is verified through a binomial test.
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