Data Report helium isotopes and neon: Baltic GasEx (2018)

3He/SF6 dual‐gas tracer injections were conducted in the southern Baltic Sea between June 06, 2018, and June 11, 2015 aboard the research vessel Alkor (AL510). SF6 was surveyed using a new, fully automated, high-resolution SF6 underway sampling and analysis system described in detail by Ho et al. (2002). For helium isotopes analysis, a total of 145 seawater samples were collected from 23 hydrographic stations aboard the Alkor (AL510), with each sample being secured in 40 ml copper tubes sealed by stainless steel pinch-off clamps. He isotope measurements were conducted in the Noble Gas Laboratory of the Lamont-Doherty Earth Observatory on a dedicated, fully automated VG5400 mass spectrometer following the procedures described by Ludin et al. (1998). Shipboard sampling was done by Tobias (Toby) Koffman. Helium extraction work and isotopic analysis by T. Koffman; data processing by P. Schlosser.

2018年6月6日至2015年6月11日期间，研究团队依托阿尔科尔号（Alkor）科考船（航次AL510），在波罗的海南部开展了氦-3（³He）/六氟化硫（SF6）双气体示踪剂注入作业。六氟化硫（SF6）的走航观测采用由Ho等人（2002年）详细阐述的新型全自动高分辨率走航采样与分析系统完成。针对氦同位素分析，研究团队在该航次的23个水文测站共采集145份海水样品，每份样品均封装于40毫升铜管中，并以不锈钢夹钳密封。氦同位素测量工作在拉蒙特-多尔蒂地球观测站（Lamont-Doherty Earth Observatory）稀有气体实验室完成，使用专用全自动VG5400型质谱仪，遵循Ludin等人（1998年）描述的实验流程操作。船上采样工作由托比亚斯（托比）·科夫曼（Tobias (Toby) Koffman）完成；氦气萃取与同位素分析工作同样由T. 科夫曼负责，数据处理则由P. 施洛瑟完成。