Seasonal variations in the Indian Ocean along 110°E. II. Particulate carbon

Abstract

Particulate carbon at 0, 50, 100, 150, and 200 m was measured by a combustion method. Mineral carbon appeared to be negligible. Some particulate material escaped the Whatman GF/C filters used. The amount of suspended carbon decreased with depth at most stations from values of 20 µg/l, or more at 0 and 50 m, to 15 µg/l, at 150 m, and 10µg/l, at 150 and 200m. Higher values were found at all depths at the two southernmost stations (25-30 µg/I. at 0 and 50 m decreasing to 15 µgll. at 150 and 200 m ) and at shallow depths at the northernmost stations (20-25 µg/l. at 0 and 50m). At all stations and at all depths, least carbon occurred in March.