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DOI | 10.5194/acp-18-3865-2018 |
Simultaneous determination of aerosol optical thickness and water-leaving radiance from multispectral measurements in coastal waters | |
Shi, Chong1,2,3; Nakajima, Teruyuki1 | |
2018-03-20 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:6页码:3865-3884 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan; Peoples R China |
英文摘要 | Retrieval of aerosol optical properties and water-leaving radiance over ocean is challenging since the latter mostly accounts for similar to 10% of the satellite-observed signal and can be easily influenced by the atmospheric scattering. Such an effort would be more difficult in turbid coastal waters due to the existence of optically complex oceanic substances or high aerosol loading. In an effort to solve such problems, we present an optimization approach for the simultaneous determination of aerosol optical thickness (AOT) and normalized water-leaving radiance (nL(w)) from multispectral satellite measurements. In this algorithm, a coupled atmosphere-ocean radiative transfer model combined with a comprehensive bio-optical oceanic module is used to jointly simulate the satellite-observed reflectance at the top of atmosphere and water-leaving radiance just above the ocean surface. Then, an optimal estimation method is adopted to retrieve AOT and nL(w) iteratively. The algorithm is validated using Aerosol Robotic Network - Ocean Color (AERONET-OC) products selected from eight OC sites distributed over different waters, consisting of observations that covered glint and non-glint conditions from the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument. Results show a good consistency between retrieved and in situ measurements at each site. It is demonstrated that more accurate AOTs are determined based on the simultaneous retrieval method, particularly in shorter wavelengths and sunglint conditions, where the averaged percentage difference (APD) of retrieved AOT is generally reduced by ap-proximate 10% in visible bands compared with those derived from the standard atmospheric correction (AC) scheme, since all the spectral measurements can be used jointly to increase the information content in the inversion of AOT, and the wind speed is also simultaneously retrieved to compensate the specular reflectance error estimated from the rough ocean surface model. For the retrieval of nLw, atmospheric overcorrection can be avoided in order to have a significant improvement of the inversion of nLw at 412 nm. Furthermore, generally better estimates of band ratios of nL(w)(443) / nL(w)(554) and nL(w)(488) / nL(w)(554) are obtained using the simultaneous retrieval approach with lower root mean square errors and relative differences than those derived from the standard AC approach in comparison to the AERONET-OC products, as well as the APD values of retrieved Chl which decreased by about 5 %. On the other hand, the standard AC scheme yields a more accurate retrieval of nL(w) at 488 nm, prompting a further optimization of the oceanic bio-optical module of the current model. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000427962300001 |
WOS关键词 | ATMOSPHERE-OCEAN SYSTEM ; ZONE COLOR SCANNER ; RADIATIVE-TRANSFER MODEL ; VICARIOUS CALIBRATION ; COUPLED ATMOSPHERE ; SIMULTANEOUS RETRIEVAL ; CORRECTION ALGORITHMS ; INVERSION ALGORITHM ; LINEAR COMBINATION ; YELLOW SUBSTANCE |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/23909 |
专题 | 地球科学 |
作者单位 | 1.Japan Aerosp Explorat Agcy, Earth Observat Res Ctr, Tsukuba, Ibaraki, Japan; 2.Nanjing Univ Informat Sci & Technol, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Nanjing, Jiangsu, Peoples R China; 3.Chinese Acad Sci, Inst Atmospher Phys, Key Lab Middle Atmosphere & Global Environm Obser, Beijing, Peoples R China |
推荐引用方式 GB/T 7714 | Shi, Chong,Nakajima, Teruyuki. Simultaneous determination of aerosol optical thickness and water-leaving radiance from multispectral measurements in coastal waters[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(6):3865-3884. |
APA | Shi, Chong,&Nakajima, Teruyuki.(2018).Simultaneous determination of aerosol optical thickness and water-leaving radiance from multispectral measurements in coastal waters.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(6),3865-3884. |
MLA | Shi, Chong,et al."Simultaneous determination of aerosol optical thickness and water-leaving radiance from multispectral measurements in coastal waters".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.6(2018):3865-3884. |
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