H2 in firn air from Megadunes, Antarctica

This dataset contains two items: 1) firn air measurements of H2 from
Megadunes, Antarctica. 2) atmospheric surface flask air measurements of H2
from NOAA GML, CSIRO, and AGAGE from 1991-2003 adjusted to a common
calibration scale.    Firn air was sampled at
the Megadunes site in central Antarctica  (80.78 °S, 124.49 °E,
Alt: 2,283 m) Antarctica during January of 2004.  A 3” diameter
hole was bored to a depth of 70 m using an ice core drill. Drilling was
paused at 15 unique depths so that firn air could be sampled. The sampling
method was similar to techniques from previous published firn air studies.
The hole was sealed above each sampling depth with an inflatable rubber
packer to prevent contamination from the modern atmosphere. A waste air
intake was positioned directly below the rubber packer. The waste air
intake was separated from the sample air intake by a stainless-steel
baffle with a 2 ¾” diameter. Air was pumped from the waste air intake 3x
faster than from the sample air intake to ensure that no air that had been
in contact with the rubber packer was sampled. 34 2 L glass flasks with
Teflon seals were filled for analysis by the NOAA/GML ESRL Carbon Cycle
group. Details are given in the following manuscript: J.D.
Patterson, M. Aydin, A.M. Crotwell, G. Pétron, J.P. Severinghaus,
P.B. Krummel, R.L. Langenfelds, and E.S. Saltzman H2 in Antarctic firn
air: atmospheric reconstructions and implications for anthropogenic
emissions, PNAS, 10.1073/pnas.2103335118, 2021.