Dissolved inorganic nutrients including 5 macro nutrients: silicate, phosphate, nitrate, nitrite, and ammonium from water column bottle samples collected during annual cruise along western Antarctic Peninsula, 1991 - 2024.

The inorganic plant macronutrients dissolved phosphate, silicate, nitrate, nitrite and ammonium are the major sources of nutrition for phytoplankton growth in seawater (with sunlight and inorganic carbon). Macronutrient distributions reflect the large-scale circulation patterns in the oceans and are useful properties to delineate water masses. Dissolved inorganic nutrients samples are typically collected in every CTD/Rosette cast performed on the annual LTER cruises along the western Antarctic Peninsula. In Antarctic waters, dissolved inorganic macronutrients are seldom depleted to limiting concentrations except during heavy prolonged phytoplankton blooms. This is due to the fact that phytoplankton growth is more often limited by light or iron, and to the short growing season. Water samples pre-filtered through 47mm GF/F filters upon collection and samples frozen until analysis. Water samples are analyzed for dissolved nutrients with recognized standard oceanographic protocols for nutrient autoanalyzers (continuous flow analyzers).

溶解态无机植物大量营养盐（包括磷酸盐、硅酸盐、硝酸盐、亚硝酸盐与铵盐）是海水环境中（辅以光照与无机碳）浮游植物生长的核心营养来源。营养盐的分布特征可反映海洋的大规模环流格局，同时也是划分水团的有效参数。沿南极半岛西部开展的年度长期生态研究（LTER）航次中，每一次温盐深仪（CTD, Conductivity, Temperature, Depth）/罗西特采水器（Rosette）下放作业，都会采集溶解态无机营养盐样品。在南极海域，除大规模且持续时间较长的浮游植物水华事件外，溶解态无机大量营养盐极少会被消耗至限制浮游植物生长的浓度阈值。这是由于浮游植物的生长通常更易受光照或铁元素限制，且南极海域的浮游植物生长季相对短暂。样品采集后需通过47mm GF/F滤膜进行预过滤，随后冷冻保存直至分析阶段。溶解态营养盐的检测采用经行业认可的标准海洋学分析规程，借助营养盐自动分析仪（连续流动分析仪）完成。