Abstract
Short-term variations in ammonia in the upper 500 m of the Sargasso Sea off Bermuda have been investigated at approximately 4 hr intervals over a 48-hr period. The “average” ammonia concentration in the euphotic zone ranged from 0·37–0·97 μgA NH 3-N/L and was high during mid- and late-morning. Low “average” levels for each day were observed near midnight. From 200–500 m the “average” ranged from 0·49–0·92 μgA NH 3-N/L. The maximum occurred just after mid-day and the minimum was reached in the early-morning. The variations in ammonia may be correlated with diurnal behaviour of the plankton populations.
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