SOMLIT-Roscoff time series (French Research Infrastructure ILICO): long-term core parameter monitoring in the Western English Channel

to characterize the hydrology of the western english channel, the station biologique de roscoff, sorbonne université/cnrs, performs the somlit-roscoff time series. since 1997, samples are collected at two fixed stations: a/ the near shore station somlit-estacade, close to the pier of roscoff strongly influenced by coastal waters and b/ the offshore station somlit-astan, at 2 nautical miles off roscoff with a permanently mixed water column (around 60 m depth). those stations are part of the french coastal environment monitoring network somlit (https://www.somlit.fr/) accredited by the cnrs as a national earth science observatory (service national d’observation: sno). the objective of the somlit network is to characterize coastal and nearshore ecosystems in a context of natural and anthropic climate change. the somlit network is part of the ir ilico france’s multi-agency research infrastructure for coastal ocean observation (https://www.ir-ilico.fr/).twice a month during the highest neap tide samples are collected at somlit-estacade and somlit-astan, at 2m depth for both stations and 60m depth for somlit-astan. water samples are analysed for more than 20 core parameters: sst, sss, dissolved oxygen, ph (spectroscopic method since 01/01/2018), ammonia, nitrates, nitrites, phosphates, silicates, suspended matter, particulate organic carbon, particulate organic nitrogen, chlorophyll, delta15n, delta13c; pico- and nano-plankton ; ctd-par-profile.the somlit network quality management system is in line with the iso/iec 17025:2017 standard: “general requirements for the competence of testing and calibration laboratories”. further information on standard operating procedures for sample collection and data acquisition are available at: https://www.somlit.fr/parametres-et-protocoles. for more information on the quality flagging scheme: https://www.somlit.fr/codes-qualite/.in the frame of the ir ilico, additional time series are also performed by the station biologique de roscoff: a/ coast-hf, high frequency hydrological monitoring national network close to somlit-astan station (https://coast-hf.fr/); b/ phytobs-network, national network of microphytoplankton monitoring at somlit-astan station (https://www.phytobs.fr/) and c/ benthobs national network of macrozoobenthos at two stations in the bay of morlaix (https://www.benthobs.fr/).

为描绘英吉利海峡西部的水文特征，罗斯科夫生物站，索邦大学/法国国家科学研究中心，执行了 SOMLIT-Roscoff 时间序列研究。自 1997 年起，在两个固定站点采集样本：a/ 近岸站点 SOMLIT-Estacade，靠近罗斯科夫码头，受海岸水域强烈影响；b/ 远岸站点 SOMLIT-Astan，位于罗斯科夫 2 海里处，具有永久性混合的水柱（约 60 米深度）。这两个站点均为法国沿海环境监测网络 SOMLIT（https://www.somlit.fr/）的组成部分，该网络经法国国家科学研究中心认证为国家级地球科学观测站（国家观测服务：SNO）。SOMLIT 网络旨在在自然和人为气候变化背景下，对沿海和近岸生态系统进行特征描述。SOMLIT 网络是法国沿海海洋观测多机构研究基础设施 IR ILICO France 的组成部分（https://www.ir-ilico.fr/）。在最高月亏潮期间，每月两次在 SOMLIT-Estacade 和 SOMLIT-Astan 站采集样本，两个站点的采集深度均为 2 米，而 SOMLIT-Astan 站的采集深度为 60 米。水样分析超过 20 个核心参数：海表温度（SST）、盐度（SSS）、溶解氧、pH 值（自 2018 年 1 月 1 日起采用光谱法）、氨、硝酸盐、亚硝酸盐、磷酸盐、硅酸盐、悬浮物质、颗粒有机碳、颗粒有机氮、叶绿素、δ15N、δ13C；微型和纳米浮游生物；CTD-Profiles。SOMLIT 网络的质量管理体系符合 ISO/IEC 17025:2017 标准：“测试和校准实验室的通用要求”。有关样本采集和数据获取的标准操作程序，更多信息可参考：https://www.somlit.fr/parametres-et-protocoles。有关质量标志方案的更多信息：https://www.somlit.fr/codes-qualite/。在 IR ILICO 的框架内，罗斯科夫生物站还执行了额外的时序研究：a/ Coast-HF，位于 SOMLIT-Astan 站附近的高频水文监测国家网络（https://coast-hf.fr/）；b/ Phytobs 网络，位于 SOMLIT-Astan 站的全国微型浮游植物监测网络（https://www.phytobs.fr/）和 c/ Benthobs，位于莫尔莱克斯湾两个站点的全国大型底栖动物监测网络（https://www.benthobs.fr/）。