2002 Fiscal Year Final Research Report Summary
Observation of Asian dust particle concentration and its transportation by ocean color satellite sensor
| Project/Area Number |
12640423
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | TOKAI UNIVERSITY |
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Principal Investigator |
FUKUSHIMA Hajime Tokai University, School of High-technology for Human Welfare, Professor, 開発工学部, 教授 (00165276)
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| Co-Investigator(Kenkyū-buntansha) |
UNO Itsushi Kyushu University, Research Institute for Applied Mechanics, Professor, 応用力学研究所, 教授 (70142099)
TORATANI Mitsuhiro Tokai University, School of High-technology for Human Welfare, Associate Professor, 開発工学部, 助教授 (90246075)
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| Project Period (FY) |
2000 – 2002
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| Keywords | Asian dust / aerosol / SeaWiFS / SeaWiFS |
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| Research Abstract |
We have proposed Dust Veil Index (DVI), an empirical index of Asian dust airmass, using SeaWiFS data, and have tried to verify its usefulness by series of radiative transfer simulation and satellite data analysis in comparison with other ground-level observation data. The advantage of the SeaWiFS DVI, which is based on the difference in Raleigh-corrected reflectance of 443 nm and 412 nm bands, is its applicability over land area as well as ocean, with much higher spatial resolution (〜1km) compared to TOMS Aerosol Index (AI). To support ACE-Asia/APEX-E2 intensive aerosol observation period, we processed daily SeaWiFS data and posted quasi-real time DVI imagery at our home page. Comparison of DVI image with dust aerosol optical thickness (AOT) predicted by Chemical Weather Forecast System (CFORS) shows very high correlation, as suggested by radiative transfer simulation.
In hope of testing validity of optical model of Asian aerosols, we compared SeaWiFS observed reflectance with the TOA reflectance predicted by radiative transfer simulation code using ship-observed ocean reflectance measured simultaneously with the satellite overpass. Match-up analysis were made over three ship observations conducted in Japan Sea during the ACE-Asia expedition, The analysis has revealed that assuming the presence of soot aerosol makes almost perfect match in TOA reflectance, the Asian dust aerosol model gives closer AOT values with the in situ measured AOT.
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