Hydrographic Relationships and Nutrient Dynamics in Coastal Waters of Pulau Tuan, Aceh Besar, Indonesia
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Abstract
This study aimed to examine the relationship between temperature, salinity, and water mass circulation; determine the trophic status of waters through chlorophyll-a concentrations; and analyze nitrate and phosphate levels using spectrophotometry. Water sampling was conducted during both high and low tides. Chlorophyll-a levels during high tide were 0.00217 mg/L (T1A01) and 0.005673 mg/L (T3A01), while during low tide, values were 0.005045 mg/L (T1A01) and 0.002907 mg/L (T3A01). Nitrate concentrations at high tide were 730 µg/L (T1A01) and 875 µg/L (T3A01), increasing to 840 µg/L and 862 µg/L during low tide. Phosphate levels were 58.53 µg/L (T1A01) and 61.35 µg/L (T3A01) during high tide, and 65.75 µg/L and 68.85 µg/L during low tide, respectively. The results indicate temporal and spatial variations in nutrient concentrations and primary productivity indicators, reflecting dynamic coastal water characteristics.
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