Monitoring programs report chlorophyll a levels and macronutrient concentrations in Antarctic waters, suggesting ecosystem health.
Chlorophyll a concentration is the most common indicator of phytoplankton biomass, basically regulated by physico-chemical properties such as temperature, salinity, macronutrients and light intensity. As part of the monitoring programs of the Japanese Antarctic Research Expedition (JARE), water temperature, salinity, chlorophyll a concentration, and macronutrients (nitrate, nitrite, phosphate, and silicic acid) have been determined since 1965. This report presents the latest data collected during the Shirase cruise in the 2018–2019 season.
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