Journal cover Journal topic
Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 3.668
IF3.668
IF 5-year value: 3.707
IF 5-year
3.707
CiteScore value: 6.3
CiteScore
6.3
SNIP value: 1.383
SNIP1.383
IPP value: 3.75
IPP3.75
SJR value: 1.525
SJR1.525
Scimago H <br class='widget-line-break'>index value: 77
Scimago H
index
77
h5-index value: 49
h5-index49
Preprints
https://doi.org/10.5194/amt-2020-313
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-313
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  15 Sep 2020

15 Sep 2020

Review status
This preprint is currently under review for the journal AMT.

Measurements of atmospheric He/N2 as an indicator of fossil fuel extraction and stratospheric circulation

Benjamin Birner, William Paplawsky, Jeffrey Severinghaus, and Ralph F. Keeling Benjamin Birner et al.
  • Scripps Institution of Oceanography, UC San Diego, La Jolla, CA 92093, USA

Abstract. The atmospheric He/N2 ratio is expected to be increasing due to the emission of He associated with fossil fuels and is expected to also vary in both space and time due to gravitational separation in the stratosphere. These signals may be useful indicators of fossil-fuel exploitation and variability in stratospheric circulation, but direct measurements of He/N2 ratio are lacking on all time scales. Here we present a high-precision custom inlet system for mass spectrometers that continuously stabilizes the flow of gas during sample-standard comparison and removes all non-noble gases from the gas stream, enabling unprecedented accuracy in measurement of relative changes in the 4He/N2 ratio. Repeat measurements of the same combination of high-pressure tanks using our inlet system achieves a reproducibility of ~ 10 per meg (i.e. 0.001 %) in 6–8 h analyses. This compares to interannual changes of He/N2 gravitational enrichment at ~ 35 km in the mid latitude stratosphere of order 300–400 per meg, and an annual tropospheric increase from human fossil fuel activity of less than ~ 30 per meg y−1 (bounded by previous work on helium isotopes). The gettering and flow-stabilizing inlet may also be used for the analysis of other noble gas isotopes and could resolve previously unobserved seasonal cycles in Kr/N2 and Xe/N2.

Benjamin Birner et al.

Interactive discussion

Status: open (until 10 Nov 2020)
Status: open (until 10 Nov 2020)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement

Benjamin Birner et al.

Benjamin Birner et al.

Viewed

Total article views: 118 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
90 25 3 118 7 1 3
  • HTML: 90
  • PDF: 25
  • XML: 3
  • Total: 118
  • Supplement: 7
  • BibTeX: 1
  • EndNote: 3
Views and downloads (calculated since 15 Sep 2020)
Cumulative views and downloads (calculated since 15 Sep 2020)

Viewed (geographical distribution)

Total article views: 42 (including HTML, PDF, and XML) Thereof 42 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 20 Sep 2020
Publications Copernicus
Download
Citation