Preliminary Retrieval of Aerosol Optical Depth from All-sky Images

HUO Juan; LU Daren

doi:10.1007/s00376-009-8216-2

Impact Factor: 5.8

Volume 27 Issue 2

Mar. 2010

Article Contents

Article > ADVANCES IN ATMOSPHERIC SCIENCES > 2010 > 27(2): 421-426

Preliminary Retrieval of Aerosol Optical Depth from All-sky Images

HUO Juan,
LU Daren

1.
Key Laboratory for Atmosphere and Global Environment Observation, Chinese Academy of Sciences, Beijing 100029,Key Laboratory for Atmosphere and Global Environment Observation, Chinese Academy of Sciences, Beijing 100029

HUO Juan,
LU Daren

doi: 10.1007/s00376-009-8216-2

Abstract
References
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Abstract:
The relationship between the radiance ratio (radiance at wavelength 450 nm to 650 nm) and aerosol optical depth (AOD) is analyzed in this paper by numerical simulation and a ``LUT' (look-up table) approach is then presented for the retrieval of AOD from the radiance ratio. In this LUT approach, the AOD retrieval error depends mainly on the assumption of aerosol types. From the preliminary simulation, a typical error of 15%--20% in AOD obtained from the radiance ratio is estimated, due to neglecting changes in the ground albedo and background atmosphere. At its worst, the AOD error reached a maximum of around 50%, which will be refined in the future. In the latter part of the paper, comparisons are made between AOD from the imager and from the CE-318 sun photometer, both located at Xianghe observatory in Hebei Province (39.75oN, 116.96oE). This field experiment shows that AOD from the imager is highly correlated with AOD from the sun photometer, with a correlation coefficient of 0.95 and an average retrieval error of around 7%. A contrast experiment confirms the feasibility of retrieving AOD from all-sky images, but more analysis and future research are required to improve the accuracy.
- all-sky,
- image,
- aerosol,
- AOD,
- radiance ratio
References

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[2]	Yongjing MA, Jinyuan XIN, Yining MA, Lingbin KONG, Kequan ZHANG, Wenyu ZHANG, Yuesi WANG, Xiuqin WANG, Yongfeng ZHU, 2017: Optical Properties and Source Analysis of Aerosols over a Desert Area in Dunhuang, Northwest China, ADVANCES IN ATMOSPHERIC SCIENCES, 34, 1017-1026. doi: 10.1007/s00376-016-6224-6
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Manuscript History

Manuscript received: 10 March 2010

Manuscript revised: 10 March 2010

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Preliminary Retrieval of Aerosol Optical Depth from All-sky Images

HUO Juan,
LU Daren

1. Key Laboratory for Atmosphere and Global Environment Observation, Chinese Academy of Sciences, Beijing 100029,Key Laboratory for Atmosphere and Global Environment Observation, Chinese Academy of Sciences, Beijing 100029

Manuscript received: 2010-03-10
Manuscript revised: 2010-03-10

Abstract: The relationship between the radiance ratio (radiance at wavelength 450 nm to 650 nm) and aerosol optical depth (AOD) is analyzed in this paper by numerical simulation and a ``LUT' (look-up table) approach is then presented for the retrieval of AOD from the radiance ratio. In this LUT approach, the AOD retrieval error depends mainly on the assumption of aerosol types. From the preliminary simulation, a typical error of 15%--20% in AOD obtained from the radiance ratio is estimated, due to neglecting changes in the ground albedo and background atmosphere. At its worst, the AOD error reached a maximum of around 50%, which will be refined in the future. In the latter part of the paper, comparisons are made between AOD from the imager and from the CE-318 sun photometer, both located at Xianghe observatory in Hebei Province (39.75oN, 116.96oE). This field experiment shows that AOD from the imager is highly correlated with AOD from the sun photometer, with a correlation coefficient of 0.95 and an average retrieval error of around 7%. A contrast experiment confirms the feasibility of retrieving AOD from all-sky images, but more analysis and future research are required to improve the accuracy.

Keywords: