 |
| Titel |
A simple parameterization of the short-wave aerosol optical properties for surface direct and diffuse irradiances assessment in a numerical weather model |
| VerfasserIn |
J. A. Ruiz-Arias, J. Dudhia, C. A. Gueymard |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1991-959X
|
| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 7, no. 3 ; Nr. 7, no. 3 (2014-06-17), S.1159-1174 |
| Datensatznummer |
250115634
|
| Publikation (Nr.) |
 copernicus.org/gmd-7-1159-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| Broadband short-wave (SW) surface direct and diffuse irradiances are not
typically within the set of output variables produced by numerical weather
prediction (NWP) models. However, they are frequently requested for
solar energy applications. In order to compute them, a detailed
representation of the aerosol optical properties is important. Nonetheless,
NWP models typically oversimplify aerosol representation or even neglect
their effect. In this work, a flexible method to account for the SW aerosol
optical properties in the computation of broadband SW surface direct and
diffuse irradiances is presented. It only requires aerosol optical depth at
0.55 μm and knowledge of the type of predominant aerosol. Other parameters
needed to consider spectral aerosol extinction, namely, Angström
exponent, aerosol single-scattering albedo and aerosol asymmetry factor, are
parameterized. The parameterization has been tested using the Rapid Radiative Transfer Model for climate and
weather models (RRTMG) SW scheme of the Weather Research and Forecasting (WRF) NWP model for data over the
continental US. In principle, it can be adapted to any other SW radiative
transfer band model. It has been verified against a control experiment and
using data from five radiometric stations in the contiguous US. The control
experiment consisted of a clear-sky evaluation of the RRTMG solar radiation
estimates obtained in WRF when RRTMG is driven with ground-observed aerosol
optical properties. Overall, the verification has shown satisfactory results
for both broadband SW surface direct and diffuse irradiances. The
parameterization has proven effective in significantly reducing the
prediction error and constraining the seasonal bias in clear-sky conditions to within the
typical observational error expected in well maintained radiometers. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|