Abstract
Tropical seas receive the bulk of the annual water and sediment discharged from the land to the sea via rivers. A significant part of it comes from the major Asian rivers with direct connections to the deep sea. Within the framework of the ongoing SCOPE/UNEP World River Programme we have examined the detailed nature and seasonal variability of organic matter in the Ganges, Brahmaputra and Indus rivers. Our results show that tropical seas, such as the Bay of Bengal and the Arabian Sea, receive large quantities of land-derived organic matter, both in the dissolved and the particulate phases, which has already undergone significant biogeochemical alteration on land. The relative stability and low nutritive value of this material enable its accumulation in the deep sea water column and sediments.
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