Vertical distributions of temperature, salinity, dissolved oxygen concentrations and saturations, Chl-a, turbidity and pH in the water column of the continental shelf off the Gironde (North East Atlantic, France)

the aim of this work was to document the seasonal and inter-annual dynamic of dissolved oxygen and ancillary data (t, s, chl-a, turbidity, ph) along a cross-shelf transect off the gironde estuary. this work has been motivated by recent simulations that suggest the occurrence of seasonal bottom deoxygenations in this river-dominated ocean margin (riomar); but unfortunately there were no data sets to test this hypothesis until now. profiles of temperature, salinity and dissolved oxygen were performed in the water column of the west gironde mud patch off the gironde estuary (from 45°46.383’n – 1°28.925’w to 45°35.524’n - 1°50.689’w) during seven cruises on the r/v côte de la manche (doi: 10.18142/284 ; 10.17600/18000861) between 2016 and 2021 (october 2016, august 2017, january 2018, april 2018, july 2019, april 2021, october 2021). turbidity was measured in january and april 2018, july 2019 and october 2021, chl-a in october 2016, august 2017, january 2018, april 2018 and july 2019 and ph in october 2021. this dataset had permitted to validate the occurrence of bottom deoxygenations when the water column is stratified.

本研究旨在记录吉龙德河口横断面海域溶解氧及其辅助数据（如水温t、盐度s、叶绿素a浓度chl-a、浊度、pH值）的季节性及年际动态变化。该研究源于近期模拟结果，该结果显示在此以河流为主导的海洋边缘区域（Riomar）可能存在季节性底部缺氧现象；然而，遗憾的是，直至目前尚未有数据集能够验证该假设。研究团队在吉龙德河口西部泥滩区域（经纬度范围：45°46.383’n – 1°28.925’w至45°35.524’n - 1°50.689’w）进行了温度、盐度及溶解氧的垂直剖面观测，观测地点位于吉龙德河口（R/V Côte de la Manche）2016年至2021年间进行的七次航行中（DOI: 10.18142/284 ; 10.17600/18000861），具体航行时间分别为2016年10月、2017年8月、2018年1月、2018年4月、2019年7月、2021年4月及2021年10月。浊度于2018年1月和4月、2019年7月及2021年10月进行测量，叶绿素a浓度于2016年10月、2017年8月、2018年1月、2018年4月及2019年7月进行测量，pH值于2021年10月进行测量。本数据集使得对水柱分层状态下底部缺氧现象的发生进行了验证。