ICAR Model Precipitation Evaluation for the South Island of New Zealand, 2007-2017

Johannes Horak from Universität Innsbruck presents an evaluation of multi-year precipitation time series generated by the Intermediate Complexity Atmospheric Research model (ICAR). The dataset covers the South Island of New Zealand on a 4x4 km² grid for the eleven-year period from 2007 to 2017, with evaluation focused on 16 weather stations in complex topography. The study investigates ICAR's skill using standard scores and the influence of model top elevation, season, and synoptic weather patterns.

Use Cases

• Evaluate precipitation model skill based on multi-year time series data for complex topography.
• Assess the impact of model top elevation on downscaling performance based on the described sensitivity analysis.
• Compare physics-based downscaling model output against reanalysis forcing data based on the reported mean squared error improvements.
• Analyze seasonal variations in model performance based on the described minimum error during winter.
• Investigate the relationship between atmospheric flow patterns and model skill based on the analysis of flow perpendicular and parallel to mountain ranges.

Strengths

• Evaluation spans an eleven-year period from 2007 to 2017, providing a multi-year climate perspective.
• Spatial resolution is 4x4 km² for the South Island of New Zealand, focusing on complex topography.
• Model shows added value over ERA-Interim reanalysis, improving mean squared errors up to 53% for alpine stations.
• Analysis includes 16 weather stations, with 11 situated in the Southern Alps between 700 m and 2150 m MSL.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and dataset size are unknown, which may limit suitability assessment.
• Last update date is unknown; freshness unverified.

Provenance

Source

Johannes Horak, Universität Innsbruck

Collection Method

Output from the Intermediate Complexity Atmospheric Research (ICAR) model, forced by ERA-Interim reanalysis data.

Time Range

2007 to 2017

Geography

South Island of New Zealand, specifically the Southern Alps region