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| Titel |
A 60 yr record of atmospheric carbon monoxide reconstructed from Greenland firn air |
| VerfasserIn |
V. V. Petrenko, P. Martinerie, P. Novelli, D. M. Etheridge, I. Levin, Z. Wang, T. Blunier, J. Chappellaz, J. Kaiser, P. Lang, L. P. Steele, S. Hammer, J. Mak, R. L. Langenfelds, J. Schwander, J. P. Severinghaus, E. Witrant, G. Petron, M. O. Battle, G. Förster, W. T. Sturges, J.-F. Lamarque, K. Steffen, J. W. C. White |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 15 ; Nr. 13, no. 15 (2013-08-06), S.7567-7585 |
| Datensatznummer |
250085610
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| Publikation (Nr.) |
 copernicus.org/acp-13-7567-2013.pdf |
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| Zusammenfassung |
| We present the first reconstruction of the Northern Hemisphere (NH) high
latitude atmospheric carbon monoxide (CO) mole fraction from Greenland firn
air. Firn air samples were collected at three deep ice core sites in
Greenland (NGRIP in 2001, Summit in 2006 and NEEM in 2008). CO records from
the three sites agree well with each other as well as with recent atmospheric
measurements, indicating that CO is well preserved in the firn at these
sites. CO atmospheric history was reconstructed back to the year 1950 from
the measurements using a combination of two forward models of gas transport
in firn and an inverse model. The reconstructed history suggests that Arctic
CO in 1950 was 140–150 nmol mol−1, which is higher than today's
values. CO mole fractions rose by 10–15 nmol mol−1 from 1950 to the
1970s and peaked in the 1970s or early 1980s, followed by a
≈ 30 nmol mol−1 decline to today's levels. We compare the CO
history with the atmospheric histories of methane, light hydrocarbons,
molecular hydrogen, CO stable isotopes and hydroxyl radicals (OH), as well as
with published CO emission inventories and results of a historical run from a
chemistry-transport model. We find that the reconstructed Greenland CO
history cannot be reconciled with available emission inventories unless
unrealistically large changes in OH are assumed. We argue that the available
CO emission inventories strongly underestimate historical NH emissions, and
fail to capture the emission decline starting in the late 1970s, which was
most likely due to reduced emissions from road transportation in North
America and Europe. |
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