Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Characteristics of MODIS Satellite Data during Fog Occurrence near the Inchon International Airport

  • Yoo Jung-Moon (Department of Science Education, Ewha Womans University) ;
  • Kim Young-Mi (Department of Science Education, Ewha Womans University) ;
  • Ahn Myoung-Hwan (Remote Sensing Research Lab. Meteorological Research Institute) ;
  • Kim Yong-Seung (Satellite Operation & Application Center, Korea Aerospace Research Institute) ;
  • Chung Chu-Yong (Remote Sensing Research Lab. Meteorological Research Institute)
  • Published : 2005.03.01
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Abstract

Simultaneous observations of MODIS (Moderate-resolution Imaging Spectroradiometer) onboard the Aqua and Terra satellites and weather station at ground near the Inchon International Airport (37.2-37.7 N, 125.7-127.2 E) during the period from December 2002 to September 2004 have been utilized in order to analyze the characteristics of satellite-observed infrared (IR) and visible data under fog and clear-sky conditions, respectively. The differences $(T_{3.7-11})$ in brightness temperature between $3.75{\mu}m\;and\;11.0{\mu}m$ were used as threshold values for remote-sensing fog (or low clouds) from satellite during day and night. The $T_{3.7-11}$ value during daytime was greater by about 21 K when it was foggy than that when it was clear, but during nighttime fog it was less by 1.5 K than during nighttime clear-sky. The value was changed due to different values of emission of fog particles at the wavelength. Since the near-IR channel at $3.7{\mu}m$ was affected by solar and IR radiations in the daytime, both IR and visible channels (or reflectance) have been used to detect fog. The reflectance during fog was higher by 0.05-0.6 than that during clear-sky, and varied seasonally. In this study, the threshold values included uncertainties when clouds existed above a layer of fog.

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References

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