Sensitivity of Radiative Fluxes to Aerosols in the ALADIN-HIRLAM Numerical Weather Prediction System
| Autor: | Velle Toll, Emily Gleeson, Kristian Pagh Nielsen, Daniel Martin Perez, Laura Rontu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Atmospheric Science
musc direct radiative effect Environmental Science (miscellaneous) lcsh:QC851-999 Radiation Atmospheric sciences cams complex mixtures Radiative transfer NWP Shortwave radiation Physics::Atmospheric and Oceanic Physics Aerosols Scattering Longwave ALADIN-HIRLAM respiratory system Numerical weather prediction atmospheric_science Aerosol aladin-hirlam MUSC Environmental science lcsh:Meteorology. Climatology Direct radiative effect nwp CAMS aerosols HIRLAM |
| Zdroj: | Atmosphere, Vol 11, Iss 2, p 205 (2020) Atmosphere Volume 11 Issue 2 ARCIMIS. Archivo Climatológico y Meteorológico Institucional (AEMET) Agencia Estatal de Meteorología (AEMET) |
| DOI: | 10.20944/preprints202001.0183.v1 |
| Popis: | 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&ndash radiation&ndash 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. |
| Databáze: | OpenAIRE |
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