Measurements of Kr/Ar and N2/Ar ratios in stored dissolved gas samples collected in 1981 through the Transient Tracers in the Ocean (TTO) program North Atlantic Survey (NAS)

This dataset includes measurements of Kr/Ar and N2/Ar ratios in stored dissolved gas samples collected in 1981 through the Transient Tracers in the Ocean (TTO) program.

These data were used, along with new observations of heavy noble gas ratios (elemental and isotopic ratios) from the Bermuda Atlantic Time-series (BATS) on cruise 10391 (30 April 2022 - 05 May 2022), to model simulations of these tracers using the Transport Matrix Method (TMM). Together these new measurements and model simulations provide insight into physical processes governing gas exchange in the high-latitude regions of North Atlantic Deep Water formation, and a comparison of physical simulations of N2/Ar ratios to observations in TTO samples reveals excess N2 that arises from benthic denitrification in the deep North Atlantic.

本数据集涵盖1981年通过海洋瞬态示踪剂计划（Transient Tracers in the Ocean, TTO）采集的储存溶解气体样品中的氪氩比（Kr/Ar）与氮氩比（N2/Ar）测量数据。
研究人员将上述数据与2022年4月30日至5月5日10391号科考航次中，百慕大大西洋时间序列（Bermuda Atlantic Time-series, BATS）站点获取的稀有重气体比值（含元素与同位素比值）新观测数据相结合，采用输运矩阵法（Transport Matrix Method, TMM）开展该类示踪剂的模型模拟工作。上述新测量数据与模型模拟结果共同阐明了调控北大西洋深层水形成高纬度区域气体交换的物理过程；将氮氩比的物理模拟结果与TTO计划采集样品的观测数据进行对比后，可发现北大西洋深层存在源自底栖反硝化作用的过量氮（N2）。