Nutrient concentration profiles from time series station E1 in the western English Channel in 2009@en

Nutrient samples for the analysis of nitrate, nitrite, silicate and phosphate for station E1 in the Western English Channel are taken fortnightly where the conditions allow it. They are sampled under clean conditions and returned in the cool and dark, and as soon as possible to the laboratory where samples are analysed for both for filtered (0.2 µm Millipore Fluoropore) and non-filtered water. Samples are not stored or frozen unless there are extenuating circumstances making the live analysis impossible. The analyser is a 5-channel Bran and Luebbe segmented flow system using well tested methodologies, and the same as those used by the PML nutrient group in all their International Research cruises, and research programmes. Quality control procedures are carried out using certified reference materials, and also the group participates in the Quasimeme programme. This has been the protocol since 2007, and prior to that the samples were stored frozen and then analysed in batches. The E1 samples are normally taken for the following depths: Surface, 10 m, 20 m, 30 m, 40 m and 60 m.英吉利海峡西部E1站位的硝酸盐、亚硝酸盐、硅酸盐及磷酸盐营养盐分析样品，在条件允许的情况下每两周采集一次。样品采用洁净采样流程采集，全程置于低温避光环境中，并尽快运送至实验室，分别对经0.2 µm 密理博（Millipore）Fluoropore滤膜过滤后的水样与未过滤水样开展分析。除非因特殊情况无法进行现场分析，否则样品不会被储存或冷冻。所用分析仪为5通道布兰-吕伯（Bran and Luebbe）分段流动分析系统，采用经过充分验证的分析方法，该方法与普利茅斯海洋实验室（Plymouth Marine Laboratory, PML）营养盐课题组在所有国际研究航次及科研项目中使用的方法一致。质量控制流程采用有证标准物质开展，同时该课题组还参与了Quasimeme计划。该操作规范自2007年起沿用至今，在此之前样品均经冷冻储存后批量分析。E1站位样品通常采集以下深度的水样：表层、10米、20米、30米、40米及60米。