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Simulation and evaluation of local daily temperature and ...
[Submitted on 2 Jul 2025 (v1), last revised 24 Jun 2026 (this ve · 2026-06-25 · via stat updates on arXiv.org

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Abstract:Reanalysis products such as the ERA5 reanalysis are commonly used as proxies for observed atmospheric conditions. These products are convenient to use due to their global coverage, the large number of available atmospheric variables and the physical consistency between these variables, as well as their relatively high spatial and temporal resolutions. However, despite the continuous improvements in accuracy and increasing spatial and temporal resolutions of reanalysis products, they may not always capture local atmospheric conditions, especially for highly localised variables such as precipitation. This paper proposes a computationally efficient stochastic downscaling of ERA5 temperature and precipitation. The method combines information from ERA5 and surface observations from nearby stations in a non-linear regression framework that combines generalised additive models (GAMs) with regression splines and auto-regressive moving average (ARMA) models to produce realistic time series of local daily temperature and precipitation. Using a wide range of evaluation criteria that address different properties of the data, the proposed framework is shown to improve the representation of local temperature and precipitation compared to ERA5 at over 4000 locations in Europe over a period of more than 70 years.

Submission history

From: Silius M. Vandeskog [view email]
[v1] Wed, 2 Jul 2025 13:19:51 UTC (5,988 KB)
[v2] Wed, 24 Jun 2026 08:13:28 UTC (6,083 KB)