Loading...
Sensitivity of Radiative Fluxes to Aerosols in the ALADIN-HIRLAM Numerical Weather Prediction System
Rontu, Laura Gleeson, Emily Martin Perez, Daniel Pagh Nielsen, Kristian Toll, Velle
Rontu, Laura
Gleeson, Emily
Martin Perez, Daniel
Pagh Nielsen, Kristian
Toll, Velle
Citation
Laura Rontu, Emily Gleeson, Daniel Martin Perez, Kristian Pagh Nielsen, Velle Toll, 'Sensitivity of Radiative Fluxes to Aerosols in the ALADIN-HIRLAM Numerical Weather Prediction System', MDPI Atmosphere, 2020-02-14, Atmosphere, 11, 205, 2020-02-14
Abstract
The direct radiative effect of aerosols is taken into account in many limited-area numerical weather prediction models using wavelength-dependent aerosol optical depths of a range of aerosol species. We studied the impact of aerosol distribution and optical properties on radiative transfer, based on climatological and more realistic near real-time aerosol data. Sensitivity tests were carried out using the single-column version of the ALADIN-HIRLAM numerical weather prediction system, set up to use the HLRADIA simple broadband radiation scheme. The tests were restricted to clear-sky cases to avoid the complication of cloud–radiation–aerosol interactions. The largest differences in radiative fluxes and heating rates were found to be due to different aerosol loads. When the loads are large, the radiative fluxes and heating rates are sensitive to the aerosol inherent optical properties and the vertical distribution of the aerosol species. In such cases, regional weather models should use external real-time aerosol data for radiation parametrizations. Impacts of aerosols on shortwave radiation dominate longwave impacts. Sensitivity experiments indicated the important effects of highly absorbing black carbon aerosols and strongly scattering desert dust.
Description
Date
2020-02-14
Journal Title
Journal ISSN
Volume Title
Corporate Name
Publisher
MDPI Atmosphere
Collections
Files
Loading...
Rontuetal_2020.pdf
Adobe PDF, 712.66 KB
Research Projects
Organizational Units
Journal Issue
Other Title
Special Issue Aerosol Radiative Effects