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Sensitivity tests for an ensemble Kalman filter for aerosol assimilation
http://hdl.handle.net/2261/51854
http://hdl.handle.net/2261/5185433c970a8-e09e-4b8a-8841-651623a1aec6
名前 / ファイル | ライセンス | アクション |
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Nakajima2010ACP_H24P148.pdf (3.2 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2017-01-06 | |||||
タイトル | ||||||
タイトル | Sensitivity tests for an ensemble Kalman filter for aerosol assimilation | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Schutgens, N. A. J.
× Schutgens, N. A. J.× Miyoshi, T.× Takemura, T.× Nakajima, T. |
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著者所属 | ||||||
値 | Center for Climate System Research, University of Tokyo | |||||
著者所属 | ||||||
値 | Department of Atmospheric and Oceanic Science, University of Maryland | |||||
著者所属 | ||||||
値 | Research Institute for Applied Mechanics, Kyushu University | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | We present sensitivity tests for a global aerosol assimilation system utilizing AERONET observations of AOT (aerosol optical thickness) and AAE (aerosol Ångström exponent). The assimilation system employs an ensemble Kalman filter which requires tuning of three numerical parameters: ensemble size nens, local patch size npatch and inflation factor ρ. In addition, experiments are performed to test the impact of various implementations of the system. For instance, we use a different prescription of the emission ensemble or a different combination of observations. The various experiments are compared against one-another and against independent AERONET and MODIS/Aqua observations. The assimilation leads to significant improvements in modelled AOT and AAE fields. Moreover remaining errors are mostly random while they are mostly systematic for an experiment without assimilation. In addition, these results do not depend much on our parameter or design choices. It appears that the value of the local patch size has by far the biggest impact on the assimilation, which has sufficiently converged for an ensemble size of nens = 20. Assimilating AOT and AAE is clearly preferential to assimilating AOT at two different wavelengths. In contrast, initial conditions or a description of aerosol beyond two modes (coarse and fine) have only little effect. We also discuss the use of the ensemble spread as an error estimate of the analysed AOT and AAE fields. We show that a very common prescription of the emission ensemble (independent random modification in each grid cell) can have trouble generating sufficient spread in the forecast ensemble. | |||||
書誌情報 |
Atmospheric chemistry and physics 巻 10, 号 14, p. 6583-6600, 発行日 2010 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 16807324 | |||||
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収録物識別子タイプ | NCID | |||||
収録物識別子 | AA12038447 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | info:doi/10.5194/acp-10-6583-2010 | |||||
権利 | ||||||
権利情報 | © Author(s) 2010. This work is distributed under the Creative Commons Attribution 3.0 License. | |||||
日本十進分類法 | ||||||
主題Scheme | NDC | |||||
主題 | 451 | |||||
出版者 | ||||||
出版者 | European Geosciences Union | |||||
出版者 | ||||||
出版者 | Copernicus Publications | |||||
異版である | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | URI | |||||
関連識別子 | http://www.atmos-chem-phys.net/10/6583/2010/acp-10-6583-2010.html |