Underway O2/Ar (Oxygen/Argon) and oxygen data collected on a research cruise on the vessel Ocean Starr, Bering, Chukchi, and Beaufort Seas, Arctic Ocean, 2019.

Data were collected between August 1, 2019 and August 24, 2019 using an equilibrated inlet mass spectrometer (EIMS, Cassar et al. 2009) connected to the surface uncontaminated seawater supply (which had a nominal intake depth of 3.5 meters) of Ocean Starr on leg 1 of Cruise identifier (ID) OS1901. Data were collected near-continuously over the cruise track which departed from Dutch Harbor, Alaska (AK) and sampled waters of the Bering and Chukchi Sea, ending in Nome, AK. This was a part of the Arctic Integrated Ecosystem Survey (Arctic IES) program. The objective of Arctic IES is to understand how reductions in Arctic sea ice and the associated changes in the physical environment influence the flow of energy through the ecosystems of the Chukchi and Beaufort seas. Two research expeditions in the Beaufort and Chukchi seas during late summer and early fall 2017 and 2019 were designed to address this objective. This survey takes measurements of the: 1) physical environment (temperature, salinity, nutrients); 2) seasonal composition, distribution and production of phytoplankton (plants); 3) distribution and standing stocks of zooplankton (bird, whale, and fish food); 4) assemblages, distributions, abundances, size, diet, and fitness of larval, early juvenile, and adult fishes; and 5) distribution and relative abundances of seabirds and marine mammals. The measurements here contribute to characterizing both the chemical environment and the rate of net biological oxygen production.

本数据集的采集工作于2019年8月1日至2019年8月24日期间开展，采用平衡式入口质谱仪（equilibrated inlet mass spectrometer，EIMS，Cassar等，2009），连接至“海洋之星号（Ocean Starr）”科考航次标识OS1901第一航段的表层未受污染海水供水系统，该供水系统的标称取水深度为3.5米。
数据沿科考航迹近乎连续采集，航迹从美国阿拉斯加州荷兰港（AK）起航，对白令海与楚科奇海海域进行采样，最终停靠于阿拉斯加州诺姆港（AK）。
本项目属于北极综合生态系统调查（Arctic Integrated Ecosystem Survey, Arctic IES）计划的一部分。北极IES的核心目标为阐明北极海冰消退及其伴随的物理环境变化，如何通过楚科奇海与波弗特海的生态系统影响能量流动。2017年与2019年夏末至初秋期间，针对波弗特海与楚科奇海开展的两次科考航次，均为达成该研究目标而设计。
本次科考开展了以下五类观测与测量工作：1）物理环境参数（水温、盐度、营养盐）；2）浮游植物（植物类群）的季节组成、空间分布与生产力；3）浮游动物——作为鸟类、鲸类与鱼类的食物来源——的空间分布与现存量；4）仔鱼、早期稚鱼和成鱼的类群组成、分布特征、丰度、体型、食性与生存适合度；5）海鸟与海洋哺乳动物的空间分布及相对丰度。
本次采集的数据可为表征研究区域的化学环境与净生物产氧速率提供支撑。