Stable water isotopes of underway seawater during MOSAiC expedition

• Main Authors: Mellat, Moein, Meyer, Hanno, Brunello, Camilla F, Werner, Martin, Dahlke, Sandro, Sommerfeld, Anja, Deckelmann, Holger, Jaiser, Ralf, Weiner, Mikaela, Marent, Andreas
• Format: Dataset
• Language: English
• Published: PANGAEA 2022
• Subjects: Arctic Ocean; Calculated after Dansgaard (1964); Comment; DATE/TIME; DEPTH; water; Deuterium excess; Event label; isotopes; Mass spectrometer Finnigan MAT Delta-S (ISOLAB); MOSAiC; MOSAiC20192020; MOSAiC expedition; Multidisciplinary drifting Observatory for the Study of Arctic Climate; North Greenland Sea; Polarstern; PS122/1; PS122/1_10-111; PS122/1_10-2; PS122/1_10-25; PS122/1_10-32; PS122/1_10-52; PS122/1_10-77; PS122/1_10-93; PS122/1_11-15; PS122/1_11-28; PS122/1_11-4; PS122/1_11-42; PS122/1_7-111; PS122/1_7-95; PS122/1_8-100; PS122/1_8-119; PS122/1_8-15; PS122/1_8-26; PS122/1_8-4; PS122/1_8-84; PS122/1_9-103; PS122/1_9-15; PS122/1_9-29; PS122/1_9-45; PS122/1_9-56; PS122/1_9-92; PS122/2; PS122/2_15-6; PS122/2_15-8; PS122/2_16-14; PS122/2_16-29; PS122/2_16-37; PS122/2_16-53; PS122/2_16-61; Greenland; Greenland Sea; North Greenland
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.948291; https://doi.org/10.1594/PANGAEA.948291

Underway seawater samples have been taken from underneath the research vessel Polarstern through a pipe installed on the ship. The valve had been open for about 2 minutes before collecting the samples to avoid possible contaminations. Water samples for measurement of stable water isotopes (δ18O, δD,) were collected in narrow-mouth low-density polyethylene 20- or 30-mL plastic bottles (VWR international LLC, Germany), sealed with Parafilm M and stored at +4 °C from the end of the expedition until the measurement. Average daily salinity values were extracted from dship portal (https://dship.awi.de/). Oxygen and hydrogen isotope analyses were carried out at the ISOLAB Facility at AWI Potsdam (https://hdl.handle.net/10013/sensor.ddc92f54-4c63-492d-81c7-696260694001) with mass spectrometers (DELTA-S Finnigan MAT, USA): https://hdl.handle.net/10013/sensor.af148dea-fe65-4c87-9744-50dc4c81f7c9 https://hdl.handle.net/10013/sensor.62e86761-9fae-4f12-9c10-9b245028ea4c employing the equilibration method (details in Meyer et al., 2000). δ18O and δD values were given in per mil (‰) vs. Vienna standard mean ocean water (V-SMOW) as the standard. The second order parameter d excess was computed according to: d excess = δD-8 δ18O (Dansgaard, 1964).