ET4I-COM: bias-corrected and adaptively merged 8-day evapotranspiration estimates at 21 Irish synoptic stations, 2018–2023
Year: 2026
Type: dataset
Abstract: # ET4I-COM: bias-corrected and adaptively merged 8-day evapotranspiration estimates at 21 Irish synoptic stations, 2018–2023 ## Overview This dataset contains the final combined evapotranspiration (COM) estimates produced as part of the Evapotranspiration for Ireland (ET4I) project for 21 synoptic weather stations across Ireland. The COM estimates were generated from multiple satellite and reanalysis evapotranspiration products using Penman–Monteith reference evapotranspiration (ETo), calculated from meteorological observations at the corresponding station locations, as the reference. The COM product was generated using an adaptive methodology consisting of adaptive bias (AB) correction followed by product combination. The AB procedure uses a window of 3 eight-day periods (24 days), followed by the COM procedure using a window of 8 eight-day periods (64 days). ## Files - `STN_COM.nc` – final COM evapotranspiration estimates at the 21 stations.- `Stations_details.csv` – station names, station codes, latitude, and longitude. The `station_code` field in `Stations_details.csv` corresponds to the `Station` coordinate in `STN_COM.nc`. ## Data structure The NetCDF file contains: - Variable: `ET`- Dimensions: `Station × datetime`- Number of stations: 21- Units: mm/8-days- Temporal resolution: approximately 8 days ## Temporal coverage - Underlying input period: 1 January 2018–31 December 2023- COM output period: 30 March 2018–27 December 2023 The first 88 days of the input period are not present in the final COM output because of the sequential moving-window initialization required by the methodology: - Adaptive bias (AB) correction: 3 × 8-day periods = 24 days- Combined product (COM): 8 × 8-day periods = 64 days- Total initialization period: 88 days Therefore, the first available COM estimate is dated 30 March 2018. ## Method The dataset was produced using an adaptive combination approach in which individual satellite and reanalysis evapotranspiration products were first bias-corrected against Penman–Monteith reference evapotranspiration at each station using the adaptive bias (AB) procedure and were subsequently combined using the COM method. The selected window sizes were: - AB: `w = 3` (24 days), selected based on minimum mean error.- COM: `w = 8` (64 days), selected as a balance between error reduction and temporal responsiveness. ## Code The code used for adaptive bias correction, COM generation, and reproducibility is openly available at: https://github.com/HaneenMuhammad/ET4I_COM ## Associated publication Muhammad, H. et al.: *An adaptive method to estimate evapotranspiration using satellite and reanalysis products.* EGUsphere preprint: https://doi.org/10.5194/egusphere-2025-4221 The record will be updated with the final journal article DOI following publication. ## Project Evapotranspiration for Ireland (ET4I) ## Funding This research was supported by Teagasc and Met Éireann through the Walsh Scholarship Programme (grant no. 2023201). ## Contact Haneen Muhammad University College Dublin Dublin, Ireland ## License CC BY 4.0
Language: English
Subfield: Global and Planetary Change
Field: Environmental Science
Domain: Physical Sciences
SDG: Climate action
Open Access status: green
OpenAlex ID: W7219085712