1999年九州南方からヤップ島にいたる海洋観測

概要

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Oceanographic observations using the CTD, XBT and ADCP systems were conducted along a section between the south of Kyushu to the Yap Islands in the Western North Pacific on October 13-18, 1999. The surface-mixed layer higher than 29 ℃ with a thickness of 47-84 m was observed from 13°N to 25°N. The Subtropical Mode Water occupied the subsurface layer between 200 m and 400 m in the region between 21°N and 28°N. In the region south of 15°N, the isotherm depths increased towards the south from 150 m to 400 m, indicating existence of the North Equatorial Current. The current velocity was measured to be ca. 20 cm/s, nearly equal to its annual mean value, indicating that the North Equatorial Current holds its normal state in fall of 1999. The saline water higher than 34.7 psu occupied the subsurface layer between 100 m and 300 m in almost whole sections. Below the subsurface saline water, there was a halocline between 34.4 psu and 34.7 psu in the entire sections. The intermediate water less than 34.2 psu occupied the layer between 600 m and 850 m in the region between 20°N and 29°N. At some latitudes in the westward zonal current region south of 20°N, some eastward return flows were detected, i.e., at 17°N, 18.5°N, and 19.5°N in the sea surface layer, at 18°N, 18.5°N and 19.5°N in the 50 m depth layer, and at 14.5°N ～15°N and 18°N in the 100 m depth layer.
鹿児島大学の論文
2000-12-25