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Morales-Salinas, Luis; Ortega-Farias, Samuel; Riveros-Burgos, Camilo; Chávez, José L; Wang, Sufen; Tian, Fei; Carrasco-Benavides, Marcos; Neira-Román, José; López-Olivari, Rafael; Fuentes-Jaque, Guillermo
Scientific reports, 09/2023, Letnik: 13, Številka: 1Journal Article
Abstract Atmospheric longwave downward radiation ( L d ) is one of the significant components of net radiation (R n ), and it drives several essential ecosystem processes. L d can be estimated with simple empirical methods using atmospheric emissivity (ε a ) submodels. In this study, eight global models for ε a were evaluated, and the best-performing model was calibrated on a global scale using a parametric instability analysis approach. The climatic data were obtained from a dynamically consistent scale resolution of basic atmospheric quantities and computed parameters known as NCEP/NCAR reanalysis (NNR) data. The performance model was evaluated with monthly average values from the NNR data. The Brutsaert equation demonstrated the best performance, and then it was calibrated. The seasonal global trend of the Brutsaert equation calibrated coefficient ranged between 1.2 and 1.4, and the K-means analysis identified five homogeneous zones (clusters) with similar behavior. Finally, the calibrated Brutsaert equation improved the R n estimation, with an error reduction, at the worldwide scale, of 64%. Meanwhile, the error reduction for each cluster ranged from 18 to 77%. Hence, Brutsaert’s equation coefficient should not be considered a constant value for use in ε a estimation, nor in time or location.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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