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http://dx.doi.org/10.7780/kjrs.2016.32.2.1

Estimation of nighttime aerosol optical thickness from Suomi-NPP DNB observations over small cities in Korea  

Choo, Gyo-Hwang (Department of Atmospheric Environmental Sciences, Gangneung-Wonju National University)
Jeong, Myeong-Jae (Department of Atmospheric Environmental Sciences, Gangneung-Wonju National University)
Publication Information
Korean Journal of Remote Sensing / v.32, no.2, 2016 , pp. 73-86 More about this Journal
Abstract
In this study, an algorithm to estimate Aerosol Optical Thickness (AOT) over small cities during nighttime has been developed by using the radiance from artificial light sources in small cities measured from Visible Infrared Imaging Radiometer Suite (VIIRS) sensor's Day/Night Band (DNB) aboard the Suomi-National Polar Partnership (Suomi-NPP) satellite. The algorithm is based on Beer's extinction law with the light sources from the artificial lights over small cities. AOT is retrieved for cloud-free pixels over individual cities, and cloud-screening was conducted by using the measurements from M-bands of VIIRS at infrared wavelengths. The retrieved nighttime AOT is compared with the aerosol products from MODerate resolution Imaging Spectroradiometer (MODIS) aboard Terra and Aqua satellites. As a result, the correlation coefficients over individual cities range from around 0.6 and 0.7 between the retrieved nighttime AOT and MODIS AOT with Root-Mean-Squared Difference (RMSD) ranged from 0.14 to 0.18. In addition, sensitivity tests were conducted for the factors affecting the nighttime AOT to estimate the range of uncertainty in the nighttime AOT retrievals. The results of this study indicate that it is promising to infer AOT using the DNB measaurements over small cities in Korea at night. After further development and refinement in the future, the developed retrieval algorithm is expected to produce nighttime aerosol information which is not operationally available over Korea.
Keywords
Aerosol; Nighttime Aerosol Optical Thickness; Day Night Band;
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