Simulation of spectral effects of Asian dusts on the AIRS radiances and its application to retrieval of dust properties

Hyo-Jin Han; Byung-Ju Sohn; Hung-Lung Huang; Elisabeth Weisz

doi:10.1117/12.869541

13 November 2010 Simulation of spectral effects of Asian dusts on the AIRS radiances and its application to retrieval of dust properties

Hyo-Jin Han, Byung-Ju Sohn, Hung-Lung Huang, Elisabeth Weisz

Author Affiliations +

Proceedings Volume 7857, Multispectral, Hyperspectral, and Ultraspectral Remote Sensing Technology, Techniques, and Applications III; 78570X (2010) https://doi.org/10.1117/12.869541
Event: SPIE Asia-Pacific Remote Sensing, 2010, Incheon, Korea, Republic of

Abstract

In order to examine the effect of Asian dusts and apply to retrieval of dust properties, radiances measured by AIRS were simulated using the RTTOV-9 model. The model has been implemented with new optical properties for Asian dusts; refractive indices of mineral dust in the OPAC library and size distribution of Asian dusts retrieved from 10 years of skyradiometer measurements at Dunhuang, China. The simulations were performed using the implemented model, but with specification of AOT and height of dust layers obtained from CALIOP measurements. In the simulations, surface and atmospheric temperatures are from AIRS level 2 products while surface emissivity is specified with UW/CIMSS monthly mean global infrared surface emissivity data. Results show that effect of Asian dusts on AIRS spectra is substantial over infrared window regions (i.e.: 3.7 - 4.1 μm, 8.8 - 9.3 μm, 10 - 13 μm) for moderate and strong dust cases (AOT ≥ 0.5), while surface effect is dominant for weak dust cases (AOT < 0.5). Over 10 - 13 μm and 3.6 - 4.1 μm ranges, the simulation performances are improved when the dust effect is added. However, on the spectral range of 8.8 - 9.3 μm, the simulation overestimates radiances in comparison with AIRS measurements, probably because the mineral dust composition of OPAC does not coincide with the Asian dust. The comparison of simulated radiances with AIRS measurements shows a comparable quality for both clear and dusty conditions on the 10 - 13 μm and 3.6 - 4.1 μm ranges, suggesting that results can be incorporated for developing dust retrieval algorithm from hyperspectral images such as AIRS and IASI.

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Hyo-Jin Han, Byung-Ju Sohn, Hung-Lung Huang, and Elisabeth Weisz "Simulation of spectral effects of Asian dusts on the AIRS radiances and its application to retrieval of dust properties", Proc. SPIE 7857, Multispectral, Hyperspectral, and Ultraspectral Remote Sensing Technology, Techniques, and Applications III, 78570X (13 November 2010); https://doi.org/10.1117/12.869541

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