Journal of Oceanography, Vol. 57 (No. 1), pp. 29-36, 2001
Naduvilaveettil Sukumaran Kalesh, Chenycherri House Sujatha and S. Muraleedharan Nair*
Department of Chemical Oceanography, School of Marine Science, Cochin University of Science and Technology, Cochin 682 016, India
(Received 22 April 2000; in revised form 26 August 2000; accepted 1 September 2000)
Abstract: Information on the distribution of dissolved Folin phenol active substances (FPAS) such as tannin and lignin in the seawater along the west coast of India is provided. Notable amounts of FPAS (surface concentrations: 80 mg/l to 147 mg/l and bottom concentrations: 80 mg/l to 116 mg/l) were detected in the seawater along the coast. The distribution pattern brings about a general depth-wise decrease. A seaward decrease was observed in the southern stations whereas reverse was the case in northern stations. A significant negative correlation was observed between FPAS concentration and dissolved oxygen in sub-surface samples. The appreciable amounts of FPAS detected in the coastal waters indicate the presence of organic matter principally originating from terrestrial (upland and coastal marsh) ecosystems in the marine environment. In this context, they may be used as tracers to determine the fate of coastal-born dissolved organic matter in the ocean and to determine directly the relationship between allochthonous and autochthonous organic matter.