Nutrients Distribution in the South Indian Ocean

Abstract

Abstract:

The distributions of total organic phosphorus(TOP), total organic nitrogen(TON), and dissolved inorganic nutrients in the south Indian Ocean were studied. The results suggest that the dissolved inorganic nutrients concentrations in the surface water are the minimum values in the sampled water depth because of the influences of physical and biological processes. Their concentrations in the deep water show little variations because of organic material remineralization and the decrease of phytoplankton consumption. In the surface water, TON and TOP are the major components of TN and TP, which suggests that the organic forms are the main forms for nitrogen and phosphorus. In the surface water, there is a distinctive eastern gradient of TON and TOP concentrations, TOP/TP and TON/TN ratios along 37. 8° S. The simultaneous measurements of chlorophyll a in photic zone reveal that the primary production variation may be the major controlling factor for spatial distributions of TON and TOP. The correlation between various forms of nitrogen and phosphorus shows that organic and inorganic nutrients are inter- complementary, and TON and TOP are the important sources for phytoplankton production in the surface water. The TN/TP ratios indicate that the nitrogen and phosphorus are not the limiting factors for the primary production in the research region.

Key words: TOP, TON, nutrients, south Indian Ocean

CLC Number:

P734.4

NI Jian-Yu,WANG Fang-Guo,YAO Xu-Ying,ZHENG Min-Hui,ZHAO Hong-Qiao. Nutrients Distribution in the South Indian Ocean[J]. Geoscience, 2011, 25(2): 322-331.

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