. Collected reprints, Essa Institute for Oceanography. Oceanography 100 102 Fig. 13.—Surface distribution of nitrogen and carbon to nitrogen ratio, Malacca Strait and adjacent Andaman Sea. 104 ou most of the strait is usually less than per- cent (fig. 13). Lowest values occur in the coarse to medium sands in the "Narrows" and in the sands along the shelf break. A noticeable in- crease in nitrogen is observed in the Southern region along the Sumatra coast where organic- rich sediments are deposited from nearby rivers. Values to the north increase in areas of finer
. Collected reprints, Essa Institute for Oceanography. Oceanography 100 102 Fig. 13.—Surface distribution of nitrogen and carbon to nitrogen ratio, Malacca Strait and adjacent Andaman Sea. 104 ou most of the strait is usually less than per- cent (fig. 13). Lowest values occur in the coarse to medium sands in the "Narrows" and in the sands along the shelf break. A noticeable in- crease in nitrogen is observed in the Southern region along the Sumatra coast where organic- rich sediments are deposited from nearby rivers. Values to the north increase in areas of finer sediment with the highest percentages occurring in the Andaman Basin. In the Malacca Strait, C/N ratios vary be- tween and ; smaller values occur in the "Narrows" (fig. 13). High ratios are found along the Sumatra coast and in the vicinity of Penang Island indicating abundant drainage from nearby streams of terrestrial humus, such as peat, which is often found disseminated through- out the finer sediments. Carbon-nitrogen ratios of 56 samples give a mean of , which is slightly higher than the mean of 13 found for the Gulf of Thailand sediments (Emery and Niino, 1963, p. 548) and considerably higher than the reported by Trask (1932, p. 21) for all Re- cent marine sediments. The large mean found in the Malacca Strait is attributed to the high in- flux of high-carbon organic matter from rivers draining areas of heavy vegetation. Although organic carbon and nitrogen content is indicative of the amount of total organic matter present in the sediment, there is no con- sensus as to the proportion of these constituents in organic matter (Bader, 1954; Kaplan and Rittenberg, 1963, p. 593). For this reason, no attempt is made here to determine the total organic content, but only to show its relative concentration by means of the organic carbon and nitrogen content. Sponge spicules are the dominant siliceous organic remains in these samples. They are most abunda
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