Sensitivity of Radiative Fluxes to Aerosols in the ALADIN-HIRLAM Numerical Weather Prediction System

被引:8
作者
Rontu, Laura [1 ]
Gleeson, Emily [2 ]
Martin Perez, Daniel [3 ]
Nielsen, Kristian Pagh [4 ]
Toll, Velle [5 ]
机构
[1] Finnish Meteorol Inst, POB 503, FIN-00101 Helsinki, Finland
[2] Met Eireann, 65-67 Glasnevin Hill, Dublin D09 Y921 9, Ireland
[3] Agencia Estatal Meteorol, C Leonardo Prieto Castro 8,Ciudad Univ, Madrid 28071, Spain
[4] Danish Meteorol Inst, Lyngbyvej 100, DK-2100 Copenhagen, Denmark
[5] Univ Tartu, Inst Phys, W Ostwaldi Str 1, EE-50411 Tartu, Estonia
基金
芬兰科学院;
关键词
aerosols; CAMS; NWP; ALADIN-HIRLAM; MUSC; direct radiative effect; SCHEME; IMPACTS; REANALYSIS; MESOSCALE; MODELS; CLOUDS; CYCLE;
D O I
10.3390/atmos11020205
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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.
引用
收藏
页数:27
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