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table2
table2
Table 2: Characteristics of the GPCP monthly mean precipitation rate v2.3 (CDR – Jan 1979 to Dec 2017)

Dataset property AchievedTarget requirement
Geographic coverageGlobalGlobal
Temporal coverage01/1979 - 12/2017Multi-decadal and up-to-date
Random error

Absolute:

PercentileUncertainty (mm/d)
50% (Median)0.70
75%1.15
95%1.76
100% (Max)14.12


n/a

Relative:


PercentileUncertainty (50%)

50% (Median)

50.7
75%101.9
95%657.7



Systematic error100% achieved*0.3 mm/d
Stability0.027 mm/d/dec*,**0.034 mm/d/dec


Info

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note1
note1
* with respect to TMPA

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note2
note2
**  over the TMPA period (1998-2017) via least-squares fit

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table3
table3
Table 3: Characteristics of the GPCP monthly mean precipitation rate v2.3 (ICDR – Jan 2018 onwards)

Dataset propertyAchievedTarget requirement
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:
95% of all differences (relative to TMPA) averaged over latitudes between 50°S and 50°N to lie between -0.175 mm/h and +0.189 mm/h

2020 onwards:
95% of all differences (relative to ERA5) averaged globally to lie between -0.336 mm/h and -0.063 mm/h

Stabilityn/an/a

1.3 Data usage information

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table4
table4
Table 4: Input data for GPCP daily, see Table 1 and algorithm description in [D2].

Name

Data typeGPCP time periodData sourceNotes
RSS SSMI Tb CDRBrightness temperature1996 to 2008NCEI

Satellite F13

The passive microwave (brightness temperature) observations are used to retrieve precipitation rates over the oceans

RSS SSMIS Tb CDRBrightness temperature2009 to presentNCEIReplaces SSM/I Tb; data only from F17
GPCP Monthly Analysis V2.3Precipitation1996 to presentNCEIFractional rainfall observations are calibrated by GPCP monthly
TOVSPrecipitation1996 to 2002GPCP/GSFCTOVS-based precipitation estimates (Susskind et al., 1997) merged with SSMI-based estimates and replace those estimates moving poleward from 40 degree latitude.
AIRS V6Precipitation2003 to presentGSFC DISCReplaces TOVS

IR 3 hourly files

Brightness temperature1996 to presentCPC

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.

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table5
table5
Table 5: Characteristics of the GPCP daily mean precipitation rate v1.3 (CDR)

Dataset propertyAchievedTarget requirement
Geographic coverageGlobalGlobal
Temporal coverage10/1996 - 12/2017Multi-decadal and up-to-date
Random errorn/an/a
Systematic error92.47% achieved*0.3 mm/d
Stability0.032 mm/d/dec*,**0.034 mm/d/dec


Info

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note3
note3
* with respect to TMPA

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note4
note4
** over the TMPA period (1998-2017) via least-squares fit

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table6
table6
Table 6: Characteristics of the GPCP daily mean precipitation rate v2.3 (ICDR)

Dataset propertyAchievedTarget requirement
Geographic coverageGlobalGlobal

Temporal coverage

01/2018 - presentContinuous updates
Random errorn/an/a

Systematic error

100% achieved

2018 & 2019:
95% of all differences to TMPA averaged over latitudes between 50°S and 50°N to lie between -0.332 mm/h and +0.343 mm/h

2020 onwards:
95% of all differences to ERA5 averaged globally to lie between -0.535 mm/h and +0.017 mm/h

Stabilityn/an/a

2.3 Data usage information

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