Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6343428 | Atmospheric Research | 2015 | 12 Pages |
Abstract
The ARF per unit of aerosol optical depth (AOD), called the aerosol radiative forcing efficiency (ARFE), is also evaluated for this shortwave spectral range. The ARFE values obtained for Ãvora and Badajoz during the first event are â 112.93 ± 6.60 W mâ 2 and â 101.63 ± 10.73 W mâ 2 per unit of AOD (500 nm), respectively, and, for the second event, â 92.44 ± 9.82 W mâ 2 and â 87.85 ± 10.19 W mâ 2 per unit of AOD (500 nm), respectively. These values also confirm the previous results, i.e., the first event causes a greater radiate cooling than the second one in both stations, although the second desert dust event is more intense, i.e., with higher aerosol optical depth and PM10 aerosol mass concentration. The presence of absorbing aerosols, together with dust, near the surface during the first event may explain the greater efficiency of this aerosol mixture to reduce the downward shortwave irradiance reaching the surface, inducing a greater radiative cooling than the second event.
Keywords
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Atmospheric Science
Authors
M.A. Obregón, S. Pereira, V. Salgueiro, M.J. Costa, A.M. Silva, A. Serrano, D. Bortoli,