円石藻のブルームが疑われる高反射率水塊の分布について : 北西太平洋の全CZCSデータセットの解析

概要

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The temporal and spatial distribution patterns of coccolithophore-like high reflectance waters in the north-western Pacific (20゜N-50゜N, 120゜E-180゜E) during 1979-86 were determined from a Nimbus-7/CZCS data set of 1940 atmospherically-corrected and quality-checked scenes. The analysis was conducted by computer classification based on the satellite-derived sub-surface reflectance at 443nm and 550nm bands, with the aid of empirical screening to exclude cloud-contaminated pixels as well as areas of high suspended solid concentration. In 22 scenes within the data set, high reflectance waters were observed in the area ranging from 35゜N to 50゜N, especially in the off Hokkaido/Sanriku area from May to September. The locations of the high reflectance water appearance indicate tendency to shift northward over the period. Although the distribution pattern may be affected by the non-uniform sampling of cloud-free satellite observation, the whole analysis shows that there is little possibility to observe high reflectance waters in other regions, including Japan Sea and the Sea of Okhotsk.
日本海洋学会の論文
1995-12-30