Hydrography and carbon from Station M (OWSM) 2021-2022

The dataset contains data from a single array mooring covering the depths between 500 m and 2000 m (bottom) at Station M (OWSM) in the Norwegian Seas. The mooring was deployed in November 2021 and retrieved in August 2022. Measurements frequency is 1/1 hr for the hydrography and 1/8 hr for the carbon measurements. At 800 m and 1200 m nominal depth, the pressure has been calculated based on distance between the SBE sensors. Ship CTD was used to correct the SBE-37 sensors at mooring. The ship CTD salinity is corrected by comparing with bottle salinity from the deepest depth. The salinity correction is linear, i.e., use the same correction all over the water depth. The salinity correction vary from station to station at a cruise, but an average offset is used for the whole cruise. Salinity samples for calibration were taken on 2021-11-26, on 2022-01-21, on 2022-05-26, and on 2022-08-02. The CO2 data was collected using a HydroC-CO2 sensor provided by 4H-Jena in Germany. The pCO2 raw data has been converted to fCO2 using temperature and salinity from a SBE-37 and, furthermore, adjusted based on discrete fCO2 data collected in January and May 2022. The adjustment was -18.73 uatm. The discrete fCO2 is calculated from discrete DIC (Dissolved Inorganic Carbon) and TA (Total Alkalinity), using constants from Lueker et al. (2000), Dickson (1990), Lee (2010), and Dickson&Riley (1979). QC flags from EuroSITES are used for all data, where flag 0 is used for raw data (unknown, no QC was performed) and flag 2-4 are used for data that have been QC-ed. Flag 1 is good data, flag 2 is probably good data, flag 3 is potentially correctable bad data, and flag 4 is bad data. This dataset is part of the NorEMSO project (RCN:295962) and EMSO-ERIC.

该数据集包含挪威海M站（OWSM）单阵列锚系（single array mooring）的观测数据，覆盖深度范围为500米至2000米（海底）。锚系于2021年11月部署，2022年8月回收。水文数据的测量频率为每小时1次，碳测量数据为每8小时1次。在标称深度800米和1200米处，压力值基于SBE传感器（SBE sensors）之间的距离计算得出。船载CTD（Ship CTD）用于校正锚系上的SBE-37传感器（SBE-37 sensors）；船载CTD盐度通过与最深层瓶盐度数据对比进行校正，校正方式为线性，即全水深范围内使用相同的校正值。盐度校正值在航次内不同站点间存在差异，但整个航次采用平均偏移量进行统一校正。用于校准的盐度样本采集于2021年11月26日、2022年1月21日、2022年5月26日及2022年8月2日。CO₂数据由德国4H-Jena公司提供的HydroC-CO₂传感器（HydroC-CO₂ sensor）采集；pCO₂原始数据利用SBE-37传感器的温度和盐度数据转换为fCO₂，并基于2022年1月和5月采集的离散fCO₂数据进一步调整，调整量为-18.73微大气压（uatm）。离散fCO₂通过离散溶解无机碳（DIC, Dissolved Inorganic Carbon）和总碱度（TA, Total Alkalinity）计算得出，采用Lueker等（2000）、Dickson（1990）、Lee（2010）及Dickson&Riley（1979）提出的常数。所有数据采用EuroSITES的质量控制标志（QC flags）：标志0表示原始数据（状态未知，未进行质量控制），标志2至4表示已完成质量控制的数据；其中标志1为良好数据，标志2为可能良好数据，标志3为潜在可校正的不良数据，标志4为不良数据。本数据集属于NorEMSO项目（RCN:295962）和EMSO-ERIC。