Chlorophyll a, macronutrient concentrations, and photosynthetically active radiation measured during the Umitaka-maru cruise of the 64th Japanese Antarctic Research Expedition (JARE64), January-February 2023

This dataset contains chlorophyll (Chl) a and macronutrient (nitrate, nitrite, phosphate and silicic acid) concentrations and photosynthetically active radiation (PAR) during he T/V Umitaka-maru cruise in the 2022/23 season as part of he monitoring program of the Japanese Antarctic Research Expedition (JARE). Water samples were collected from the underway seawater supply twice a day and at multiple depths from select CTD (conductivity, temperature and depth) rosette deployments at 9 stations along 110 degree east. Chl. a and macronutrients (nitrate, nitrite, phosphate and silicic acid) concentrations were quality controled. PAR was measured continuously by a sensor mounted on the bridge of the ship.本数据集包含2022/23航次“海鹰丸”（T/V Umitaka-maru）考察航次的观测数据，该航次系日本南极考察队（Japanese Antarctic Research Expedition, JARE）监测计划的组成部分。数据涵盖叶绿素a（Chl a）、大量营养盐（硝酸盐、亚硝酸盐、磷酸盐与硅酸）浓度，以及光合有效辐射（photosynthetically active radiation, PAR）。水样通过走航式海水采集系统每日采集两次；在沿东经110°布设的9个测站中，研究人员通过选定的温盐深（conductivity, temperature and depth, CTD）采水器阵列完成了多深度分层水样采集。叶绿素a与各类大量营养盐浓度均经过质量控制；光合有效辐射（PAR）由安装于船舶驾驶台的传感器持续监测获取。