Chemical data from expeditions in the Kara, Laptev and East Siberian Seas in 2017 and 2018

Dataset includes hydrographic and chemical data from bottle samples obteined during expeditions of Shirshov Institute of Oceanology of Russian Academy of Sciences according to program "Ecosystem of the Seas of the Siberian Arctic" which has been implementing since 2007. Expeditions were on the R/V Akademik Mstislav Keldysh in the Kara, Laptev and East Siberian Seas in August-September in 2017 and 2018 (69th and 72nd cruises). Samples data include surface samples from ship flow-through system (1st sheet of file) and samples from water column on complex oceanographic stations (2nd sheet of file). This includes T, S, pH, total alkalinity (Alk), nutrients (silicates - Si, nitrates - NO3, phosphorus - PO4) and calculated carbonate system parameters (parcial pressure of CO2 - pCO2 in μatm; aragonite saturation state - ΩAr). Hydrographic parameters (T, S, depth) were recovered along with CTD (SBE 911 plus), chemical parameters were determined on board during few hours after water sampling according to methods (Grasshoff, 2009; Parsons, 2013).本数据集包含俄罗斯科学院希尔绍夫海洋研究所（Shirshov Institute of Oceanology of Russian Academy of Sciences）于2007年启动的“西伯利亚北极海域生态系统”科考项目期间，通过瓶装采样获取的水文与化学数据。本次科考依托“姆斯季斯拉夫·凯尔迪什院士号”（Akademik Mstislav Keldysh）考察船，于2017年与2018年8-9月在喀拉海、拉普捷夫海与东西伯利亚海开展，对应第69、72次科考航次。 样本数据包含两类：一是通过船舶流通系统采集的表层水样（对应数据集文件的第一张工作表），二是复杂海洋学站位采集的水柱水样（对应数据集文件的第二张工作表）。检测指标涵盖温度（T）、盐度（S）、pH值、总碱度（Alk）、营养盐（硅酸盐Si、硝酸盐NO3、磷酸盐PO4），以及计算得到的碳酸盐系统参数：二氧化碳分压（pCO₂，单位为微大气压μatm）、文石饱和状态（ΩAr）。 水文参数（温度、盐度、水深）通过CTD（SBE 911 plus型）设备采集；化学参数于水样采集后数小时内在船上实验室完成测定，测定方法参考Grasshoff（2009）与Parsons（2013）的标准规程。