Chlorophyll a and macro-nutrients concentrations during the ice breaker Shirase cruise of the 58th Japanese Antarctic Research Expedition

Chlorophyll a concentration is the most common indicator of phytoplankton biomass, basically regulated by macro-nutrients and light intensity. Therefore, long term monitoring of these parameters gives us fundamental information on ecosystem changes with climate changes. As part of the monitoring programs of the Japanese Antarctic Research Expedition (JARE), chlorophyll a concentration and macro-nutrients (nitrate, nitrite, phosphate and silicate) have been measured on board icebreakers Fuji and Shirase from JARE-14 in the 1972/73 season and from JARE-7 in the 1965/66 season, respectively. This report is the latest data determined during the Shirase cruise in 2016/17 season.叶绿素a（Chlorophyll a）浓度是表征浮游植物生物量最常用的指标，其水平主要受大量营养盐（macro-nutrients）与光照强度调控。因此，对上述参数开展长期监测，可为我们提供气候变化背景下生态系统变化的核心基础信息。作为日本南极考察队（Japanese Antarctic Research Expedition, JARE）监测计划的组成部分，研究人员分别在“富士号”（Fuji）破冰船（对应1972/1973年度第14次考察JARE-14）与“白濑号”（Shirase）破冰船（对应1965/1966年度第7次考察JARE-7）上，对叶绿素a浓度与大量营养盐（硝酸盐、亚硝酸盐、磷酸盐及硅酸盐）进行了实地测量。本报告收录的为2016/2017年度“白濑号”考察航次所测定的最新数据。