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Table 1: Input data for GPCP monthly, see Tables 1 and 2 and algorithm description in [D1]. Anchor table1 table1
Name | Data type | GPCP time period | Data source | Notes |
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RSS SSMI Tb CDR | Brightness temperature | Aug 1987 to Dec 2008 | NCEI | Data from satellites F08: Jul 1987 to Dec 1991 (excl. Dec 1987) F11: Jan 1992 to May 1995 F13: June 1995 to Dec 2008 The passive microwave (brightness temperature) observations are used to retrieve precipitation rates over the oceans |
RSS SSMIS Tb CDR | Brightness temperature | Jan 2009 to present | NCEI | Replaces SSM/I Tb; data only from satellite F17 |
Ferraro | Precipitation | Aug 1987 to present | NESDIS/STAR | Precipitation rates over land based on SSMI/SSMIS observations, according to Ferraro (1997) |
TOVS | Precipitation | Aug 1987 to Dec 2002 | GPCP/GSFC | TOVS-based precipitation estimates (Susskind et al., 1997) merged with SSMI-based estimates and replace those estimates moving poleward from 40 degree latitude. |
AIRS V6 | Precipitation | Jan 2003 to present | GSFC DISC | Replaces TOVS |
OPI | Precipitation | Jan 1979 to Dec 1985 | GPCP/GSFC | Satellites used: TIROS-N, NOAA-6, NOAA-7, NOAA-9 AVHRR-based Outgoing Longwave Radiation Precipitation Index (OPI) |
IR Monthly | Brightness temperature | Jan 1986 to Dec 1996 | GPCP/GSFC | Infrared observations by geostationary satellites |
IR 3 hourly files | Brightness temperature | Jan 1997 to present | CPC | Files include IR histograms and OPI precipitation |
GPCC version 7 Full Data Reanalysis | Precipitation | Jan 1979 to Dec 2013 | DWD (GPCC) | Climate quality 2.5° gridded gauge data over land; reprocessed regularly Over land, the bias of the satellite-based is adjusted to match the bias of GPCC; then a weighted average of GPCC and satellite-based estimates is computed as final output of the algorithm |
GPCC Monitoring Product version 5 | Precipitation | Jan 2014 to present | DWD (GPCC) | Interim version of full analysis intended to continue record |
1.2 Target requirements
Table 2 provides an overview of achieved and targeted coverage and error-related properties of the TCDR-part of the dataset (until 12/2017). The target requirements (errors, stability) have been formulated in the context of monitoring the quality of precipitation products within C3S via Key Performance Indicators (KPI). They refer to the comparison of the dataset to a specific reference dataset. Here, the achieved specifications are computed in comparison with TMPA 3B43 (TRMM, 2011) which is available between 50°S and 50°N.
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Dataset property | Achieved | Target requirement | ||||||||||
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Geographic coverage | Global | Global | ||||||||||
Temporal coverage | 01/1979 - 12/2017 | Multi-decadal and up-to-date | ||||||||||
Random error | Absolute:
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Relative: | ||||||||||||
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Systematic error | 100% achieved* | 0.3 mm/d | ||||||||||
Stability | 0.027 mm/d/dec*,** | 0.034 mm/d/dec |
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Table 3: Characteristics of the GPCP monthly mean precipitation rate v2.3 (ICDR – Jan 2018 onwards) Anchor table3 table3
Dataset property | Achieved | Target requirement |
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Geographic coverage | Global | Global |
Temporal coverage | 01/2018 - present | Continuous updates |
Random error | Same distribution as in Table 2 applies. | n/a |
Systematic error | 100% achieved | 2018 & 2019: 2020 onwards: |
Stability | n/a | n/a |
1.3 Data usage information
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Table 4: Input data for GPCP daily, see Table 1 and algorithm description in [D2]. Anchor table4 table4
Name | Data type | GPCP time period | Data source | Notes |
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RSS SSMI Tb CDR | Brightness temperature | 1996 to 2008 | NCEI | Satellite F13 The passive microwave (brightness temperature) observations are used to retrieve precipitation rates over the oceans |
RSS SSMIS Tb CDR | Brightness temperature | 2009 to present | NCEI | Replaces SSM/I Tb; data only from F17 |
GPCP Monthly Analysis V2.3 | Precipitation | 1996 to present | NCEI | Fractional rainfall observations are calibrated by GPCP monthly |
TOVS | Precipitation | 1996 to 2002 | GPCP/GSFC | TOVS-based precipitation estimates (Susskind et al., 1997) merged with SSMI-based estimates and replace those estimates moving poleward from 40 degree latitude. |
AIRS V6 | Precipitation | 2003 to present | GSFC DISC | Replaces TOVS |
IR 3 hourly files | Brightness temperature | 1996 to present | CPC | Infrared observations by geostationary satellites Files include IR histograms and OPI precipitation |
2.2 Target requirements
Table 5 provides an overview of achieved and targeted coverage- and error-related properties of the TCDR dataset. The target requirements (errors, stability) have been formulated in the context of monitoring the quality of precipitation products within C3S via Key Performance Indicators. They refer to the comparison of the dataset to a specific reference dataset. Here, the achieved specifications are computed in comparison with TMPA 3B42 (Goddard Earth Sciences Data and Information Services Center, 2016) which is available between 50°S and 50°N.
Table 5: Characteristics of the GPCP daily mean precipitation rate v1.3 (CDR) Anchor table5 table5
Dataset property | Achieved | Target requirement |
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Geographic coverage | Global | Global |
Temporal coverage | 10/1996 - 12/2017 | Multi-decadal and up-to-date |
Random error | n/a | n/a |
Systematic error | 92.47% achieved* | 0.3 mm/d |
Stability | 0.032 mm/d/dec*,** | 0.034 mm/d/dec |
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Dataset property | Achieved | Target requirement |
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Geographic coverage | Global | Global |
Temporal coverage | 01/2018 - present | Continuous updates |
Random error | n/a | n/a |
Systematic error | 100% achieved | 2018 & 2019: 2020 onwards: |
Stability | n/a | n/a |
2.3 Data usage information
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Tropical Rainfall Measuring Mission (TRMM) (2011), TRMM (TMPA/3B43) Rainfall Estimate L3 1 month 0.25 degree x 0.25 degree V7, Greenbelt, MD, Goddard Earth Sciences Data and Information Services Center (GES DISC), doi: 10.5067/TRMM/TMPA/MONTH/7
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This document has been produced in the context of the Copernicus Climate Change Service (C3S). The activities leading to these results have been contracted by the European Centre for Medium-Range Weather Forecasts, operator of C3S on behalf of the European Union (Delegation agreement signed on 11/11/2014). All information in this document is provided "as is" and no guarantee or warranty is given that the information is fit for any particular purpose. The users thereof use the information at their sole risk and liability. For the avoidance of all doubt , the European Commission and the European Centre for Medium - Range Weather Forecasts have no liability in respect of this document, which is merely representing the author's view. |
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