http://swrc.ontoware.org/ontology#Article Chlorophyll a and macronutrient concentrations during the icebreaker Shirase cruise of the 60th Japanese Antarctic Research Expedition en Southern Ocean chlorophyll a macro-nutrients 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. Polar Data Journal 5 47-53 2021-03 National Institute of Polar Research 2432-6771 https://doi.org/10.17592/001.2020070705|Original Data Marine biology