Characterization of in situ cosmogenic 14CO production, retention and loss in firn and shallow ice at Summit, Greenland

  1. Hmiel, Benjamin
  2. Petrenko, Vasilii V.
  3. Buizert, Christo
  4. Smith, Andrew M.
  5. Dyonisius, Michael N.
  6. Place, Philip
  7. Yang, Bin
  8. Hua, Quan
  9. Beaudette, Ross
  10. Severinghaus, Jeffrey P.
  11. Harth, Christina
  12. Weiss, Ray F.
  13. Davidge, Lindsey
  14. Diaz, Melisa
  15. Pacicco, Matthew
  16. Menking, James A.
  17. Kalk, Michael
  18. Faïn, Xavier
  19. Adolph, Alden
  20. Vimont, Isaac
  21. Murray, Lee T.

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1000 Titel
  • Characterization of in situ cosmogenic 14CO production, retention and loss in firn and shallow ice at Summit, Greenland
1000 Autor/in
  1. Hmiel, Benjamin |
  2. Petrenko, Vasilii V. |
  3. Buizert, Christo |
  4. Smith, Andrew M. |
  5. Dyonisius, Michael N. |
  6. Place, Philip |
  7. Yang, Bin |
  8. Hua, Quan |
  9. Beaudette, Ross |
  10. Severinghaus, Jeffrey P. |
  11. Harth, Christina |
  12. Weiss, Ray F. |
  13. Davidge, Lindsey |
  14. Diaz, Melisa |
  15. Pacicco, Matthew |
  16. Menking, James A. |
  17. Kalk, Michael |
  18. Faïn, Xavier |
  19. Adolph, Alden |
  20. Vimont, Isaac |
  21. Murray, Lee T. |
1000 Verlag
  • Copernicus Publications
1000 Erscheinungsjahr 2024
1000 Publikationstyp
  1. Artikel |
1000 Online veröffentlicht
  • 2024-07-25
1000 Erschienen in
1000 Quellenangabe
  • 18(7):3363-3382
1000 Copyrightjahr
  • 2024
1000 Lizenz
1000 Verlagsversion
  • https://doi.org/10.5194/tc-18-3363-2024 |
1000 Publikationsstatus
1000 Begutachtungsstatus
1000 Sprache der Publikation
1000 Abstract/Summary
  • <jats:p>Abstract. Measurements of carbon-14-containing carbon monoxide (14CO) in glacial ice are useful for studies of the past oxidative capacity of the atmosphere as well as for reconstructing the past cosmic ray flux. The 14CO abundance in glacial ice represents the combination of trapped atmospheric 14CO and in situ cosmogenic 14CO. The systematics of in situ cosmogenic 14CO production and retention in ice are not fully quantified, posing an obstacle to interpretation of ice core 14CO measurements. Here we provide the first comprehensive characterization of 14CO at an ice accumulation site (Summit, Greenland), including measurements in the ice grains of the firn matrix, firn air and bubbly ice below the firn zone. The results are interpreted with the aid of a firn gas transport model into which we implemented in situ cosmogenic 14C. We find that almost all (≈ 99.5 %) of in situ 14CO that is produced in the ice grains in firn is very rapidly (in &lt;1 year) lost to the open porosity and from there mostly vented to the atmosphere. The timescale of this rapid loss is consistent with what is expected from gas diffusion through ice. The small fraction of in situ 14CO that initially stays in the ice grains continues to slowly leak out to the open porosity at a rate of ≈ 0.6 % yr−1. Below the firn zone we observe an increase in 14CO content with depth that is due to in situ 14CO production by deep-penetrating muons, confirming recent estimates of 14CO production rates in ice via the muon mechanisms and allowing for narrowing constraints on these production rates. </jats:p>
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