SOMLIT-SOGIR time series (French Research Infrastructure ILICO): long-term core parameter monitoring in the Gironde Estuary

The SOMLIT-SOGIR time-series data characterize the hydrology of the Gironde Estuary ecosystem, located in the South-western France and flowing into the Bay of Biscay. Monthly-like measurements have been undertaken since 1997 by the OASU and EPOC teams (Univ. Bordeaux/CNRS). The SOMLIT-SOGIR time series is a part of the French monitoring network SOMLIT (https://www.somlit.fr/), labelled by the CNRS as a national Earth Science Observatory (Service National d’Observation : SNO). It aims to detect the long-term evolution of monitored ecosystems including both natural and anthropogenic forcings. Implemented at three sites (PK 30: 45.06833°N, 0.63833°W; PK 52: 45.24667°N, 0.725°W; PK 86:  45.5167°N, 0.95°W), the SOMLIT-SOGIR time series is among the oldest long-term coastal observation time series of the French Research Infrastructure dedicated to coastal ocean observations (RI ILICO, https://www.ir-ilico.fr). SOMLIT-SOGIR samples are collected at 1m below the water surface and 1m above the floor, at high and low tide, during slack water. Samples collected are analysed for 15 core parameters: water temperature and salinity, dissolved oxygen, pH, ammonia, nitrate, nitrite, phosphate, silicic acid, suspended particulate matter, particulate organic carbone, particulate nitrogen, chlorophyll a, delta15N and delta13C. CTD-PAR-profile is also performed at site PK86 during high tide. 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/.

SOMLIT-SOGIR时间序列数据集刻画了位于法国西南部、最终注入比斯开湾的吉伦特河口生态系统的水文特征。自1997年起，波尔多大学/法国国家科学研究中心（CNRS）下属的OASU与EPOC团队开展了类月度监测工作。SOMLIT-SOGIR时间序列隶属于法国SOMLIT监测网络（SOMLIT，https://www.somlit.fr/），该网络被法国国家科学研究中心（CNRS）认定为国家地球科学观测台（Service National d’Observation，简称SNO）。本数据集旨在监测受监测生态系统的长期演变过程，涵盖自然与人为双重驱动因子。该时间序列在三个监测点位布设：PK 30（45.06833°N，0.63833°W）、PK 52（45.24667°N，0.725°W）以及PK 86（45.5167°N，0.95°W），是法国海岸海洋观测研究基础设施（RI ILICO，https://www.ir-ilico.fr）旗下历史最悠久的长期海岸观测时间序列之一。SOMLIT-SOGIR的采样工作在水面下1米、水底上方1米处开展，采样时段为憩流期的涨潮与落潮阶段。本次采集的样品共分析15项核心参数：水温、盐度、溶解氧、pH值、氨氮、硝酸盐、亚硝酸盐、磷酸盐、硅酸、悬浮颗粒物、颗粒有机碳、颗粒态氮、叶绿素a、δ15N以及δ13C。此外，在PK86点位涨潮期间还会开展CTD-PAR-profile剖面测量。SOMLIT网络的质量管理体系符合ISO/IEC 17025:2017标准《检测和校准实验室能力的通用要求》。有关样品采集与数据获取的标准作业程序的更多信息可访问：https://www.somlit.fr/parametres-et-protocoles；关于质量标记方案的详细信息，请访问：https://www.somlit.fr/codes-qualite/。