10.7280/D18698
Saltzman, Eric
0000-0003-4364-6023
University of California, Irvine
H2 in firn air from Megadunes, Antarctica
Dryad
dataset
2021
Atmospheric chemistry
National Science Foundation
https://ror.org/021nxhr62
OPP- 1907974
2021-08-04T00:00:00Z
2021-08-04T00:00:00Z
en
https://doi.org/10.1073/pnas.2103335118
35584 bytes
5
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
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.
The firn air samples were analyzed for H2 at NOAA/GML using gas
chromatography with a mercuric oxide reduction gas analyzer (HgO-RGA).
Relative measurement uncertainty is estimated at ±2%. The H2 measurements
are reported as dry air mole fraction (ppb=nmol H2 mol-1 air). The
measurements were corrected for calibration drift, detector non-linearity,
and gravitational fractionation.