Chlorophyll a and macronutrient concentrations during the icebreaker Shirase cruise of the 61st Japanese Antarctic Research Expedition

Chlorophyll a concentration is the most common indicator of phytoplankton biomass, basically regulated by physicochemical 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 measured since 1965. This report presents the latest data collected during the Shirase cruise in the 2019-2020 season.叶绿素a浓度（Chlorophyll a concentration）是表征浮游植物生物量的最常用指标，其变化主要受水温、盐度、大量营养盐及光照强度等理化特性调控。作为日本南极考察队（Japanese Antarctic Research Expedition, JARE）监测计划的组成部分，自1965年起，研究人员便持续开展了水温、盐度、叶绿素a浓度以及大量营养盐（硝酸盐、亚硝酸盐、磷酸盐与硅酸）的测定工作。本报告呈现了2019-2020年度‘白濑号（Shirase）’考察航次所采集的最新观测数据。