Nutrient concentration profiles from time series station E1 in the western English Channel in 2008

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.

针对英吉利海峡西部E1站位的硝酸盐、亚硝酸盐、硅酸盐与磷酸盐分析需求的营养盐样品，在条件允许时每两周采集一次。样品采用洁净采样方式采集后，置于阴凉避光环境下并尽快送抵实验室，针对经0.2 µm 密理博（Millipore）氟罗普尔（Fluoropore）滤膜过滤的水样及未过滤水样分别开展分析。若无致使无法开展即时分析的特殊情形，样品不会进行储存或冷冻处理。分析仪器为5通道布兰吕贝（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PML（普利茅斯海洋实验室，Plymouth Marine Laboratory）营养盐课题组在所有国际研究航次及科研项目中所使用的方法一致。质量控制流程采用有证参考物质开展，同时该课题组还参与了Quasimeme（海洋营养盐质量控制计划）项目。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分批开展分析。E1站位的样品通常采集自以下水层：表层、10 m、20 m、30 m、40 m及60 m。