Detection properties of dust and sandstorms by using AVI of MODIS data

Yoshinobu Kato

doi:10.1117/12.869429

4 November 2010 Detection properties of dust and sandstorms by using AVI of MODIS data

Yoshinobu Kato

Proceedings Volume 7859, Remote Sensing of the Atmosphere and Clouds III; 78590H (2010) https://doi.org/10.1117/12.869429
Event: SPIE Asia-Pacific Remote Sensing, 2010, Incheon, Korea, Republic of

Abstract

The detection properties of dust and sandstorms (DSS) by using AVI are examined. The aerosol vapor index (AVI) is defined as AVI=T12-T11, where T12 and T11 are the brightness temperatures respectively at 12μm and 11μm wave lengths. MODIS data of Terra/Aqua satellites from China to Japan in April 2006 are used. The AVI vs. T11 scatter charts in narrow regions are made. The narrow region means the region which is smaller than about 100km × 100km. Gu et al. (2003) gave a BTD vs. T11 chart which was based on the radiative transfer calculation in the case of the existence of DSS layer between the ground and the satellite, where BTD=-AVI. The AVI vs. T11 scatter charts are compared with the true-color images, the T11 images, the AVI images and the result by Gu et al. The results are as follows: (1) The larger the AVI value is, the larger the optical thickness of DSS is, in the case of narrow region on land and sea with DSS that does not include cloud. The AVI value decreases, in the case of narrow region with DSS that includes cloud. (2) When the DSS is consecutive on land and sea, the AVI value on the land near the boundary of land and sea is about 0.2-2.3K higher than that on the sea, because of the radiative characteristics of land and sea. The AVI value of a pixel (1km²) on the boundary of land and sea is changed by the ratio of land area and sea area.

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Yoshinobu Kato "Detection properties of dust and sandstorms by using AVI of MODIS data", Proc. SPIE 7859, Remote Sensing of the Atmosphere and Clouds III, 78590H (4 November 2010); https://doi.org/10.1117/12.869429

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KEYWORDS

Decision support systems

Clouds

Satellites

Particles

MODIS

Radiative transfer

Infrared radiation

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