Law Dome DE08-OH firn air 15N, O2/N2, Ar/N2, 18O of O2

This data set comprises measurements of noble and inert gases in the firn at the DE08-OH site sampled in 2018-2019 near the summit of Law Dome, Antarctica. The data show the expected gravitational enrichment of heavy isotopes with depth, somewhat attenuated by the high accumulation rate and a near-surface well-mixed zone (convective zone), and the "lock-in" horizon at 68 m depth. As seen at many other sites, the heavy isotope of oxygen 18O is depleted progressively with depth within the lock-in zone due to faster gas permeation of 16O16O relative to 18O16O from compressed air bubbles.

本数据集包含2018-2019年在南极洲劳 Dome（Law Dome）峰顶附近的DE08-OH站点采集的粒雪（firn）中稀有气体与惰性气体的测量数据。数据显示，重同位素随深度呈现预期的重力富集现象，但该现象因高积累速率、近地表充分混合层（对流层，convective zone）以及68米深度处的锁定层位（lock-in horizon）而有所减弱。与其他多个站点观测结果一致，锁定层（lock-in zone）内氧的重同位素18O随深度逐渐减少，这是由于压缩气泡中16O16O的气体渗透速率快于18O16O所致。