EO:EUM:DAT:0921

GIRAFE v1: CM SAF Global Interpolated RAinFall Estimation version 1

The GIRAFE v1 climate data record (CDR) provides precipitation estimates derived from a combination of passive microwave (PMW) observations onboard polar orbiting satellites and infrared (IR) observations onboard geostationary satellites. GIRAFE v1 covers the time period 2002/01/01 until 2022/12/31. The PMW input to GIRAFE v1 is from various microwave imager and sounder instruments. Precipitation rate estimates are retrieved from the observed PMW brightness temperatures by precipitation retrieval algorithms HOAPS, PNPR-CLIM*, and PRPS. The resulting archives of instantaneous precipitation rate estimates are homogenized using quantile mapping. The IR input to GIRAFE comes from the five geostationary positions forming the Geo-Ring, providing observations along all geographical longitudes. The spatially and temporally highly resolved IR input is trained to detect the occurrence of precipitation using the PMW-based instantaneous precipitation rate estimates. Conditional precipitation rates are computed based on PMW observations only. At latitudes higher than 55°N/S where Geo-Ring IR pixels are extremely distorted, GIRAFE v1 relies only on the PMW input. GIRAFE v1 is a gridded product which is available globally at a spatial resolution of 1° x 1° and at a temporal resolution of 24h as accumulated precipitation computed from the (IR-based) fraction of precipitation and the conditional precipitation rate. Additionally, 1° x 1° monthly mean values of the daily accumulated precipitation are provided. The daily accumulated precipitation features a dedicated sampling uncertainty at the same 1° x 1° x 24 h resolution which is based on the analysis of decorrelation scales in space and time in the IR-based precipitation fields. This is a Thematic Climate Data Record (TCDR). *The PNPR-CLIM algorithm has been developed by CNR-ISAC in the C3S_312b_Lot1 Copernicus project.

Satellite:

Instrument:

Temporal Extent: 2002-01-01 - 2022-12-31

Orbit Type: GEO

Data Policy: NoConditions

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