Stable water isotopes and conductivities of a lead case study during leg 5 of the MOSAiC expedition

• Main Authors: Meyer, Hanno, Mellat, Moein, Nomura, Daiki, Damm, Ellen, Bauch, Dorothea, Weiner, Mikaela, Marent, Andreas
• Format: Dataset
• Language: English
• Published: PANGAEA 2022
• Subjects: Arctic Ocean; AWI_Envi; AWI_Perma; Calculated after Dansgaard (1964); Chamber for gas sampling; CHAMGAS; Comment; Conductivity sensor Cond 315i; WTW GmbH; Germany; DATE/TIME; DEPTH; ice/snow; water; Deuterium excess; Event label; freshwater; IC; Ice corer; Latitude of event; leads; Leg 5; Longitude of event; Mass spectrometer Finnigan MAT Delta-S (ISOLAB); Mosaic; MOSAiC20192020; Multidisciplinary drifting Observatory for the Study of Arctic Climate; Permafrost Research; Polarstern; Polar Terrestrial Environmental Systems @ AWI; PS122/5; PS122/5_59-343; PS122/5_59-389; PS122/5_59-392; PS122/5_59-446; PS122/5_59-447; PS122/5_60-130; PS122/5_60-133; PS122/5_60-146; PS122/5_60-16; PS122/5_60-260; PS122/5_60-61; PS122/5_61-126; PS122/5_61-205; PS122/5_61-206; PS122/5_62-117; PS122/5_62-120; PS122/5_62-35; Arctic; Duran; Narrow Neck; Ice; permafrost; Sea ice
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.945285; https://doi.org/10.1594/PANGAEA.945285

The dataset comprises stable water isotopes and conductitities of a lead case study during leg 5 of the MOSAiC campaign. Samples have been taken from different water and ice types for this lead case study. Discrete water samples were taken using a peristaltic pump (Masterflex E/S Portable Sampler, Masterflex, USA) through a 2 m long PTFE tube (L/S Pump Tubing, Masterflex, USA). Water samples for measurement of stable water isotopes (δ18O, δD,) were collected in 50-mL glass screw-cap narrow-neck vials (VWR international LLC, Germany). Snow on the sea ice was sampled with a polyethylene shovel (GL Science Inc., Tokyo, Japan) and placed into a polyethylene zip-loc bag. Ice in the lead was collected and a 0.25 m ' 0.25 m ice block was cut with a hand saw and placed into a zip-lock bag. Ice temperature at the surface was measured with a needle-type temperature sensor (Testo 110 NTC, Brandt Instruments, Inc., USA). Two ice cores from the bottom of a melt pond were collected, using an ice corer with an inner diameter of 0.09 m (Mark II coring system, KOVACS Enterprises, Inc., USA). The cores were cut with a stainless steel saw into 0.1 m thick sections and stored in plastic bags for subsequent salinity and δ18O measurements. Snow and ice samples were immediately placed in a cooler box along with refrigerants to keep their temperature low and to minimize brine drainage. Onboard Polarstern, ice samples were transferred into ice melting bags (Smart bags PA, AAK 5L, GL Sciences Inc., Japan) and melted in the dark at +4°C. After the ice melted, the meltwater was placed in a 30-mL glass screw-cap vial for later stable water isotope measurement and into a 100-mL polypropylene bottle (I-Boy, AS ONE Corporation, Japan) for later salinity measurement. These samples were stored at +4°C in the dark until analysis. Under-ice water samples (from about 10 m depth) were collected via R/V Polarstern's underway water sampling system during leg 5. Samples were placed into 250-mL glass vials (Duran Co. Ltd, Germany) for later δ18O and ...