Korean Journal of Remote Sensing (대한원격탐사학회지)

Korean Society of Remote Sensing (대한원격탐사학회)
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Estimation of nighttime aerosol optical thickness from Suomi-NPP DNB observations over small cities in Korea

Suomi-NPP위성 DNB관측을 이용한 우리나라 소도시에서의 야간 에어로졸 광학두께 추정

  • Choo, Gyo-Hwang (Department of Atmospheric Environmental Sciences, Gangneung-Wonju National University) ;
  • Jeong, Myeong-Jae (Department of Atmospheric Environmental Sciences, Gangneung-Wonju National University)
  • 추교황 (강릉원주대학교 대기환경과학과) ;
  • 정명재 (강릉원주대학교 대기환경과학과)
  • Received : 2015.12.07
  • Accepted : 2016.01.25
  • Published : 2016.04.30
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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.

이 연구에서는 Suomi-National Polar Partnership(Suomi-NPP) 위성에 탑재된 Visible Infrared Imaging Radiometer Suite(VIIRS) 센서의 Day/Night Band(DNB)로부터 측정된 인공광원 복사휘도 정보를 이용하여 우리나라 소도시들에서 야간 에어로졸 광학두께를 추정하는 방법을 개발하였다. 개발된 알고리즘에서는 야간에 도시의 인공광원들로부터 방출되는 빛을 광원으로하여 Beer의 복사 감쇠법칙이 이용되었으며, VIIRS의 적외선 영역 M밴드 관측자료를 사용하여 구름화소를 제거함으로써 청천화소에 대하여 에어로졸 광학두께를 산출하였다. 본 연구에서 산출된 야간 에어로졸 광학두께 결과는 주간 MODerate resolution Imaging Spectroradiometer(MODIS) 센서로부터 산출된 자료와 비교 검증하였다. 검증 결과, 도시에 따라 0.6~0.7이상의 상관계수와 0.14~0.18 범위의 제곱근-평균-제곱 차이(Root-Mean-Square Difference; RMSD)를 보였다. 추가적으로 야간 에어로졸 광학두께에 영향을 미치는 인자들에 대한 민감도 실험을 수행하여 개발된 알고리즘의 산출 오차의 범위를 추정하였다. 본 연구를 통하여 우리나라에서 야간에 DNB채널 관측자료를 이용하여 에어로졸 광학두께를 추정할 수 있는 가능성을 확인 하였으며, 개발된 알고리즘의 지속적인 개발 및 개선이 이루어진다면 향후 국내에서 기존에 부족했던 야간 에어로졸 정보의 산출에 기여할 것으로 기대된다.

Keywords

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