Summary
• Nitrate, phosphate, and silica increased 20-40% in the
upper water column between cruises.
• Ammonia declined strongly (~60%) in the upper water
column between cruises.
• Very high standing stock of ammonia in Marguerite
Bay
– ~500 µmol/m2
– possibly drifted to southwest during cruise 103
– declined ~3-fold between cruises
• Nutrient remineralization (nitrification) possible but
difficult to explain quantitatively
• No attempt to correct for circulation effects