Dust Aerosol Radiative Effects During a Dust Event and Heatwave in Summer 2019 Simulated with a Regional Climate Atmospheric Model over the Iberian Peninsula
Effets radiatifs des aérosols de poussière lors d'un épisode de poussière et d'une vague de chaleur en été 2019 simulés avec un modèle atmosphérique climatique régional sur la péninsule ibérique
Gil-Díaz, Cristina ; Sicard, Michäel ; Nabat, Pierre ; Mallet, Marc ; Muñoz-Porcar, Constantino ; Comerón, Adolfo ; Rodríguez-Gómez, Alejandro ; dos Santos Oliveira, Daniel Camilo Fortunato
Mineral dust particles significantly influence the Earth's climate through direct and semi-direct radiative effects. This study investigates these effects and their meteorological impacts during a dust intrusion and heatwave over the Iberian Peninsula in summer 2019 using a regional climate model. Three simulations with different spectral nudging configurations are evaluated. During the central period, the mean direct and semi-direct radiative effects in the shortwave spectrum at the top of the atmosphere (bottom of the atmosphere) are ?0.4 ± 0.4 (?3.9 ± 2.3) Wm?2 and +0.1 ± 1.7 (?0.1 ± 1.9) Wm?2, respectively. In the longwave spectrum, these effects are +0.1 ± 0.1 (+0.3 ± 0.1) WmWm?2 and 0.0 ± 0.6 (+0.9 ± 1.1) Wm?2, respectively. The semi-direct effect mitigates 18.8% of the dust-induced warming in the full atmosphere and alters meteorological variables. The liquid water path decreases by ?0.2 ± 4.5 mg m?2, the cloud fraction in the upper (lower) troposphere reduces (increases) by ?0.2 ± 1.2 (+0.1 ± 1.3) %, and the near-surface air temperature drops slightly by ?0.2 ± 0.2 °C. The results highlight substantial spatial variability and underscore the importance of considering semi-direct radiative effects in radiative analysis.</p>
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