Bias correction

The scripts/perform_bias_correction.sh script applies bias correction to precipitation data using the dart-bias-correct tool. This process adjusts modeled precipitation values to better match historical observations.

Overview

This script prepares and corrects total precipitation data for each year in the configured time range. It requires a valid precipitation reference file, historical observations, and a configuration that enables bias correction.

If bias correction is not enabled in the configuration, the script exits early without performing any operations.

Usage

./scripts/perform_bias_correction.sh config.sh

Data access

Some of the reference datasets for bias correction are not open access. This includes the historical forecast data obtained from ECMWF’s MARS service.

The historical observation data can be generated using dart-pipeline:

uv run dart-pipeline process era5.prep_bias_correct ISO3 Y1-Y2

Data storage

Running bias correction creates ISO3-YYYY-era5.accum.tp_corrected.nc files in the sources/ISO3/era5 subfolder. These are picked up by the processing pipeline.