Adaption of the MODIS aerosol retrieval algorithm using airborne spectral surface reflectance measurements over urban areas: a case study
文献类型：期刊论文
| 作者 | Jaekel, E.1; Mey, B.1; Levy, R.1; Gu, X.1; Yu, T.1; Li, Z.1; Althausen, D.1; Heese, B.1; Wendisch, M.1 |
| 刊名 | ATMOSPHERIC MEASUREMENT TECHNIQUES
 |
| 出版日期 | 2015 |
| 卷号 | 8期号:12页码:13085-13096 |
| 通讯作者 | Jakel, E (reprint author), Univ Leipzig, Leipzig Inst Meteorol, Stephanstr 3, D-04103 Leipzig, Germany. |
| 英文摘要 | MODIS (MOderate-resolution Imaging Spectroradiometer) retrievals of aerosol optical depth (AOD) are biased over urban areas, primarily because the reflectance characteristics of urban surfaces are different than that assumed by the retrieval algorithm. Specifically, the operational "dark-target" retrieval is tuned towards vegetated (dark) surfaces and assumes a spectral relationship to estimate the surface reflectance in blue and red wavelengths. From airborne measurements of surface reflectance over the city of Zhongshan, China, were collected that could replace the assumptions within the MODIS retrieval algorithm. The subsequent impact was tested upon two versions of the operational algorithm, Collections 5 and 6 (C5 and C6). AOD retrieval results of the operational and modified algorithms were compared for a specific case study over Zhongshan to show minor differences between them all. However, the Zhongshan-based spectral surface relationship was applied to a much larger urban sample, specifically to the MODIS data taken over Beijing between 2010 and 2014. These results were compared directly to ground-based AERONET (AErosol RObotic NETwork) measurements of AOD. A significant reduction of the differences between the AOD retrieved by the modified algorithms and AERONET was found, whereby the mean difference decreased from 0.27 +/- 0.14 for the operational C5 and 0.19 +/- 0.12 for the operational C6 to 0.10 +/- 0.15 and -0.02 +/- 0.17 by using the modified C5 and C6 retrievals. Since the modified algorithms assume a higher contribution by the surface to the total measured reflectance from MODIS, consequently the overestimation of AOD by the operational methods is reduced. Furthermore, the sensitivity of the MODIS AOD retrieval with respect to different surface types was investigated. Radiative transfer simulations were performed to model reflectances at top of atmosphere for predefined aerosol properties. The reflectance data were used as input for the retrieval methods. It was shown that the operational MODIS AOD retrieval over land reproduces the AOD reference input of 0.85 for dark surface types (retrieved AOD = 0.87 (C5)). An overestimation of AOD = 0.99 is found for urban surfaces, whereas the modified C5 algorithm shows a good performance with a retrieved value of AOD = 0.86. |
| 研究领域[WOS] | Meteorology & Atmospheric Sciences |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000367384600014 |
| 源URL | [http://ir.ceode.ac.cn/handle/183411/38499]  |
| 专题 | 遥感与数字地球研究所_SCI/EI期刊论文_期刊论文 |
| 作者单位 | 1.[Jaekel, E. 2.Mey, B. 3.Wendisch, M.] Univ Leipzig, Leipzig Inst Meteorol, D-04103 Leipzig, Germany 4.[Mey, B.] Fraunhofer Inst Wind Energy & Energy Syst Technol, D-34119 Kassel, Germany 5.[Levy, R.] NASA, GSFC, Greenbelt, MD 20771 USA 6.[Gu, X. 7.Yu, T. 8.Li, Z.] Chinese Acad Sci, Inst Remote Sensing & Digital Earth, Beijing 100101, Peoples R China 9.[Althausen, D. 10.Heese, B.] Leibniz Inst Tropospher Res, D-04318 Leipzig, Germany |
| 推荐引用方式 GB/T 7714 | Jaekel, E.,Mey, B.,Levy, R.,et al. Adaption of the MODIS aerosol retrieval algorithm using airborne spectral surface reflectance measurements over urban areas: a case study[J]. ATMOSPHERIC MEASUREMENT TECHNIQUES,2015,8(12):13085-13096. |
| APA | Jaekel, E..,Mey, B..,Levy, R..,Gu, X..,Yu, T..,...&Wendisch, M..(2015).Adaption of the MODIS aerosol retrieval algorithm using airborne spectral surface reflectance measurements over urban areas: a case study.ATMOSPHERIC MEASUREMENT TECHNIQUES,8(12),13085-13096. |
| MLA | Jaekel, E.,et al."Adaption of the MODIS aerosol retrieval algorithm using airborne spectral surface reflectance measurements over urban areas: a case study".ATMOSPHERIC MEASUREMENT TECHNIQUES 8.12(2015):13085-13096. |
入库方式： OAI收割
来源：遥感与数字地球研究所
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