GPCPMON: Global Monthly Precipitation Estimates at 0.5-Degree Resolution

A long-term, homogeneous global precipitation record from the Global Precipitation Climatology Project (GPCP), using modern merging techniques and satellite inputs. The dataset is produced by NASA under the World Climate Research Program and is currently paused at September 2024 pending calibration updates for its input data. It provides monthly precipitation fields at a 0.5-degree spatial resolution, along with ancillary error estimates.

Use Cases

• Modeling global water and energy cycles based on the merged satellite and gauge precipitation estimates.
• Analyzing long-term precipitation climatology and trends based on the homogeneous record.
• Calibrating regional climate models using the 0.5-degree monthly precipitation fields.
• Studying precipitation error and uncertainty based on the provided ancillary estimates.

Strengths

• Provides a long, homogeneous precipitation record, continuing the GPCP Version 2.X legacy.
• Internally consistent product suite includes monthly and daily 0.5-degree data, with a planned higher-resolution product.
• Merges multiple input sources including satellite-based PERSIANN-CDR, TOVS/AIRS, and GPCC gauge analyses over land.

Limitations

• Data updates are currently paused at September 2024, limiting recency.
• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and dataset size are unknown, which may limit suitability assessment.

Provenance

Source

National Aeronautics and Space Administration (NASA) via the Global Precipitation Climatology Project (GPCP).

Collection Method

Satellite-based product merging inputs from GPROF SSMI/SSMIS, PERSIANN-CDR, TOVS/AIRS, and GPCC gauge analyses.

Time Range

Long-term record; current version paused at September 2024.

Freshness

Updates were paused at September 2024; future updates are expected quarterly after input data calibration.

Geography

Global coverage.