Water column chemistry in the southern Romanian EEZ 2023-2024 (H2020 BRIDGE-BS project)

Dataset contains hydrochemistry data collected along the Mangalia - East transect, in the Romanian southern EEZ (bottom depths between 15 and 1160 m), within the period February 2023 - July 2024. Data were collected during three BRIDGE -BS cruises carried out onboard R/V Mare Nigrum in February 2023 (cruise MN238), June 2023 (cruise MN242), and July 2024 (cruise MN260). In situ measurements of physical-chemical seawater parameters were done at each sampling station using SBE 25 CTD. Seawater samples were collected with 5L Niskin bottles from different depths, according to the CTD vertical profiles, and further analyzed in the GeoEcoMar lab for nutrients (by spectrometry), chlorophylls (by spectrometry), total mercury, and PAHs (by UPLC), the latter two only for July 2024 cruise. OCPs (by GC-ECD), PCBs (GC-ECD), and PAHs (by GC-MS) were analyzed in the NIMRD lab for the 2023 cruises. In addition, size-fractioned chlorophyll was analyzed by spectrometry for the June 2023 cruise in the NIMRD lab.本数据集包含采集于罗马尼亚南部专属经济区（Exclusive Economic Zone, EEZ）曼加利亚-东部断面的水化学数据，该区域海底水深介于15至1160米，数据采集时段为2023年2月至2024年7月。数据通过三次BRIDGE-BS航次采集完成，三次航次分别于2023年2月（航次MN238）、2023年6月（航次MN242）及2024年7月（航次MN260）在“黑海马”号（R/V Mare Nigrum）科考船上执行。每个采样站位均采用SBE 25型CTD完成海水物理化学参数的原位测定。研究人员依据CTD垂向剖面，使用5升尼斯金采水器从不同深度采集海水样品，后续在GeoEcoMar实验室完成多项指标分析：营养盐（分光光度法）、叶绿素（分光光度法）、总汞及多环芳烃（PAHs，超高效液相色谱UPLC法），其中总汞与PAHs仅在2024年7月航次中进行了检测。2023年航次的样品则在NIMRD实验室完成了有机氯农药（OCPs，气相色谱-电子捕获检测器法GC-ECD）、多氯联苯（PCBs，气相色谱-电子捕获检测器法GC-ECD）及多环芳烃（PAHs，气相色谱-质谱联用法GC-MS）的分析。此外，2023年6月航次的分级粒径叶绿素样品也在NIMRD实验室通过分光光度法完成了分析。