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DOI10.5194/acp-21-14591-2021
Aerosol properties and aerosol-radiation interactions in clear-sky conditions over Germany
Witthuhn J.; Hünerbein A.; Filipitsch F.; Wacker S.; Meilinger S.; Deneke H.
发表日期2021
ISSN1680-7316
起始页码14591
结束页码14630
卷号21期号:19
英文摘要The clear-sky radiative effect of aerosol-radiation interactions is of relevance for our understanding of the climate system. The influence of aerosol on the surface energy budget is of high interest for the renewable energy sector. In this study, the radiative effect is investigated in particular with respect to seasonal and regional variations for the region of Germany and the year 2015 at the surface and top of atmosphere using two complementary approaches. First, an ensemble of clear-sky models which explicitly consider aerosols is utilized to retrieve the aerosol optical depth and the surface direct radiative effect of aerosols by means of a clear-sky fitting technique. For this, short-wave broadband irradiance measurements in the absence of clouds are used as a basis. A clear-sky detection algorithm is used to identify cloud-free observations. Considered are measurements of the short-wave broadband global and diffuse horizontal irradiance with shaded and unshaded pyranometers at 25 stations across Germany within the observational network of the German Weather Service (DWD). The clear-sky models used are the Modified MAC model (MMAC), the Meteorological Radiation Model (MRM) v6.1, the Meteorological-Statistical solar radiation model (METSTAT), the European Solar Radiation Atlas (ESRA), Heliosat-1, the Center for Environment and Man solar radiation model (CEM), and the simplified Solis model. The definition of aerosol and atmospheric characteristics of the models are examined in detail for their suitability for this approach. Second, the radiative effect is estimated using explicit radiative transfer simulations with inputs on the meteorological state of the atmosphere, trace gases and aerosol from the Copernicus Atmosphere Monitoring Service (CAMS) reanalysis. The aerosol optical properties (aerosol optical depth, Ångström exponent, single scattering albedo and asymmetry parameter) are first evaluated with AERONET direct sun and inversion products. The largest inconsistency is found for the aerosol absorption, which is overestimated by about 0.03 or about 30% by the CAMS reanalysis. Compared to the DWD observational network, the simulated global, direct and diffuse irradiances show reasonable agreement within the measurement uncertainty. The radiative kernel method is used to estimate the resulting uncertainty and bias of the simulated direct radiative effect. The uncertainty is estimated to -1.5±7.7 and 0.6±3.5Wm-2 at the surface and top of atmosphere, respectively, while the annual-mean biases at the surface, top of atmosphere and total atmosphere are -10.6, -6.5 and 4.1Wm-2, respectively. The retrieval of the aerosol radiative effect with the clearsky models shows a high level of agreement with the radiative transfer simulations, with an RMSE of 5.8Wm-2 and a correlation of 0.75. The annual mean of the REari at the surface for the 25 DWD stations shows a value of -12.8±5Wm-2 as the average over the clear-sky models, compared to -11Wm-2 from the radiative transfer simulations. Since all models assume a fixed aerosol characterization, the annual cycle of the aerosol radiation effect cannot be reproduced. Out of this set of clear-sky models, the largest level of agreement is shown by the ESRA and MRM v6.1 models. Copyright: © 2021 Jonas Witthuhn et al.
语种英语
scopus关键词aerosol; aerosol property; clear sky; optical depth; seasonal variation; top of atmosphere; Germany
来源期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/246539
作者单位Leibniz Institute for Tropospheric Research (TROPOS), Leipzig, Germany; German Weather Service (DWD), Meteorological Observatory Lindenberg, Tauche, Germany; International Centre for Sustainable Development (IZNE), Bonn-Rhein-Sieg University of Applied Sciences, Sankt Augustin, Germany
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GB/T 7714
Witthuhn J.,Hünerbein A.,Filipitsch F.,et al. Aerosol properties and aerosol-radiation interactions in clear-sky conditions over Germany[J],2021,21(19).
APA Witthuhn J.,Hünerbein A.,Filipitsch F.,Wacker S.,Meilinger S.,&Deneke H..(2021).Aerosol properties and aerosol-radiation interactions in clear-sky conditions over Germany.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(19).
MLA Witthuhn J.,et al."Aerosol properties and aerosol-radiation interactions in clear-sky conditions over Germany".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.19(2021).
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