Aerosol Optical Thickness over the Oceans Derived from GMS-5 during Spring 2002 and 2003(<Special Issue>ADEC-Aeolian Dust Experiment on Climate Impact-)

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Daily and monthly aerosol optical thickness (AOT) over the ocean, derived from the Geostationary Meteorological Satellite (GMS-5) visible data, were compared with those determined from the sun photometer measurements in March and April 2002. Time variations in the daily AOT derived from the GMS-5 showed good agreements with those from the sun photometer measurements. Correlation coefficient between the GMS-5 and the sun photometer derived daily AOTs was 0.85 for 61 samples taken at three sun photometer observation sites; Ryori, Yonagunijima, and Minamitorishima in Japan. The difference of monthly AOT, the GMS-5 minus the sun photometer, in March and April 2002 were -0.03 and 0.03 at Ryori, -0.01 and 0.18 at Yonagunijima, and 0.01 and 0.07 at Minamitorishima, respectively. Monthly regional AOT, defined as the median of the daily AOTs over 30° latitude×30° longitude region, was calculated in latitude from 60°N to 60°S and in longitude from 80°E to 160°W for March and April of 2002 and 2003. In the southern hemisphere, monthly regional AOT was less than 0.1; about 0.1〜0.2 in 0°N〜30°N; larger than 0.2 in 30°N〜60°N with a maximum of 0.4〜0.5 in the western region near the Asian continent. AOTs in 2003 were generally smaller than those in 2002 in six regions between 110°E and 160°W of the northern hemisphere, where aerosol loading is most likely affected by the Asian dust. The numbers of regions, in which the AOT increased/decreased/equivalent from 2002 to 2003, were 3/8/1 in March and April, with the AOT changes from 2002 to 2003 to be as large as -0.04〜0.03.
社団法人日本気象学会の論文
2005-03-31

Aerosol Optical Thickness over the Oceans Derived from GMS-5 during Spring 2002 and 2003(<Special Issue>ADEC-Aeolian Dust Experiment on Climate Impact-)

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