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Assessing the Surface Downward Longwave Irradiance Models Using ERA5 Input Data in Canada.


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Khorsandi, Mostafa ORCID logoORCID: https://orcid.org/0000-0002-4359-1600; St-Hilaire, André ORCID logoORCID: https://orcid.org/0000-0001-8443-5885 et Arsenault, Richard (2023). Assessing the Surface Downward Longwave Irradiance Models Using ERA5 Input Data in Canada. Journal of Hydrometeorology , vol. 24 , nº 6. pp. 1175-1190. DOI: 10.1175/JHM-D-22-0184.1.

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Longwave radiation (LR) is one of the energy balance components responsible for warming and cooling water during hot summers. Both downward incoming LR, emitted by the atmosphere, and outgoing LR emitted by the land surface are not widely measured. The influence of clouds on the LR heat budget makes it even harder to establish reliable formulations for all-sky conditions. This paper uses air temperature and cloud cover from the ERA5 reanalysis database to compare 20 models for the downward longwave irradiance (DLI) at Earth’s surface and compare them with ERA5’s DLI product. Our work uses long-time continuous DLI measured data at three stations over Canada, and ERA5 reanalysis, a reliable source for data-scarce regions, such as central British Columbia (Canada). The results show the feasibility of the local calibration of different formulations using ERA5 reanalysis data for all-sky conditions with RMSE metrics ranging from 37.1 to 267.3 W m ⁻² , which is comparable with ERA5 reanalysis data and can easily be applied at broader scales by implementing it into hydrological models. Moreover, it is shown that ERA5 gridded data for DLI shows the best results with RMSE = 31.7 W m⁻² . This higher performance suggests using ERA5 data directly as input data for hydrological and ecological models.

Type de document: Article
Mots-clés libres: long wave radiation; ERA5 data; empirical models
Centre: Centre Eau Terre Environnement
Date de dépôt: 02 nov. 2023 13:30
Dernière modification: 02 nov. 2023 13:30
URI: https://espace.inrs.ca/id/eprint/13700

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