The thermal infrared radiance properties of dust aerosol over ocean

Zengzhou Hao; Delu Pan; Qianguang Tu; Fang Gong; Jianyu Chen

doi:10.1117/12.2195348

16 October 2015 The thermal infrared radiance properties of dust aerosol over ocean

Zengzhou Hao, Delu Pan, Qianguang Tu, Fang Gong, Jianyu Chen

Proceedings Volume 9640, Remote Sensing of Clouds and the Atmosphere XX; 96400M (2015) https://doi.org/10.1117/12.2195348
Event: SPIE Remote Sensing, 2015, Toulouse, France

Abstract

Asian dust storms, which can long-range transport to ocean, often occur on spring. The present of Asian dust aerosols over ocean makes some difficult for other studies, such as cloud detection, and also take some advantage for ocean, such as take nutrition into the ocean by dry or wet deposition. Therefore, it is important to study the dust aerosol and retrieve the properties of dust from satellite observations that is mainly from the thermal infrared radiance. In this paper, the thermal infrared radiance properties of dust aerosol over ocean are analyzed from MODIS and MTSAT2 observations and Streamer model simulations. By analyzing some line samples and a series of dust aerosol region, it shows that the dust aerosol brightness temperature at 12μm (BT₁₂) is always greater than BT₁₁ and BT_8.5, and BT_8.5 is general greater than BT₁₁. The brightness temperature different between 11μm and 12μm (BTD_11-12) increases with the dust intensity. And the BTD_11-12will become positive when the atmospheric relative humidity is greater than 70%. The BTD_11-12increases gradually with the surface temperature while the effect on BTD_11-12of dust layer temperature is not evident. Those are caused by the transmission of the dust aerosol is different at the two thermal infrared channels. During daytime, dust infrared brightness temperature at mid-infrared bands should reduce the visual radiance, which takes about 25K or less. In general, BT_3.7 is greater than BT₁₁ for dust aerosol. Those results are helpful to monitor or retrieve dust aerosol physical properties over ocean from satellite.

Citation Download Citation

Zengzhou Hao, Delu Pan, Qianguang Tu, Fang Gong, and Jianyu Chen "The thermal infrared radiance properties of dust aerosol over ocean", Proc. SPIE 9640, Remote Sensing of Clouds and the Atmosphere XX, 96400M (16 October 2015); https://doi.org/10.1117/12.2195348

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