In situ photolysis of deep ice core contaminants by Çerenkov radiation of cosmic origin
Ice core contaminants should provide permanent paleoclimatic records if, as it is generally assumed, they remained frozen in place and isolated from sunlight by the reflective overlaying snow layers. The excess CO levels recently detected in 1100–1600 AD Greenland ice core air bubbles relative to th...
Published in: | Geophysical Research Letters |
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American Geophysical Union
2003
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ftcaltechauth:oai:authors.library.caltech.edu:62891 2023-05-15T13:57:16+02:00 In situ photolysis of deep ice core contaminants by Çerenkov radiation of cosmic origin Colussi, A. J. Hoffmann, M. R. 2003-02 application/pdf https://authors.library.caltech.edu/62891/ https://authors.library.caltech.edu/62891/1/grl16364.pdf https://resolver.caltech.edu/CaltechAUTHORS:20151214-134828694 en eng American Geophysical Union https://authors.library.caltech.edu/62891/1/grl16364.pdf Colussi, A. J. and Hoffmann, M. R. (2003) In situ photolysis of deep ice core contaminants by Çerenkov radiation of cosmic origin. Geophysical Research Letters, 30 (4). Art. No. 1195. ISSN 0094-8276. doi:10.1029/2002GL016112. https://resolver.caltech.edu/CaltechAUTHORS:20151214-134828694 <https://resolver.caltech.edu/CaltechAUTHORS:20151214-134828694> other Article PeerReviewed 2003 ftcaltechauth https://doi.org/10.1029/2002GL016112 2021-11-11T19:07:16Z Ice core contaminants should provide permanent paleoclimatic records if, as it is generally assumed, they remained frozen in place and isolated from sunlight by the reflective overlaying snow layers. The excess CO levels recently detected in 1100–1600 AD Greenland ice core air bubbles relative to their Antarctic counterparts [Haan and Raynaud, 1998] amount, however, to an average production of about 5 ± 2 CO molecules cm^(−3) ice s^(−1) in that period. Here we show that such rates are quantitatively consistent with the in situ photodecarbonylation of the chromophoric organic matter present in Greenland, but not in the cleaner Antarctic, ice under the Çerenkov radiation fluxes generated by penetrating muons of cosmic origin. The normal CO levels of modern (1600–1800 AD) Greenland records, and their variability earlier in the last millennium correlate significantly with the occurrence of boreal fires and the associated release of organic aerosol [Savarino and Legrand, 1998]. Article in Journal/Newspaper Antarc* Antarctic Greenland Greenland ice core ice core Caltech Authors (California Institute of Technology) Antarctic Greenland Geophysical Research Letters 30 4 |
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Caltech Authors (California Institute of Technology) |
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English |
description |
Ice core contaminants should provide permanent paleoclimatic records if, as it is generally assumed, they remained frozen in place and isolated from sunlight by the reflective overlaying snow layers. The excess CO levels recently detected in 1100–1600 AD Greenland ice core air bubbles relative to their Antarctic counterparts [Haan and Raynaud, 1998] amount, however, to an average production of about 5 ± 2 CO molecules cm^(−3) ice s^(−1) in that period. Here we show that such rates are quantitatively consistent with the in situ photodecarbonylation of the chromophoric organic matter present in Greenland, but not in the cleaner Antarctic, ice under the Çerenkov radiation fluxes generated by penetrating muons of cosmic origin. The normal CO levels of modern (1600–1800 AD) Greenland records, and their variability earlier in the last millennium correlate significantly with the occurrence of boreal fires and the associated release of organic aerosol [Savarino and Legrand, 1998]. |
format |
Article in Journal/Newspaper |
author |
Colussi, A. J. Hoffmann, M. R. |
spellingShingle |
Colussi, A. J. Hoffmann, M. R. In situ photolysis of deep ice core contaminants by Çerenkov radiation of cosmic origin |
author_facet |
Colussi, A. J. Hoffmann, M. R. |
author_sort |
Colussi, A. J. |
title |
In situ photolysis of deep ice core contaminants by Çerenkov radiation of cosmic origin |
title_short |
In situ photolysis of deep ice core contaminants by Çerenkov radiation of cosmic origin |
title_full |
In situ photolysis of deep ice core contaminants by Çerenkov radiation of cosmic origin |
title_fullStr |
In situ photolysis of deep ice core contaminants by Çerenkov radiation of cosmic origin |
title_full_unstemmed |
In situ photolysis of deep ice core contaminants by Çerenkov radiation of cosmic origin |
title_sort |
in situ photolysis of deep ice core contaminants by çerenkov radiation of cosmic origin |
publisher |
American Geophysical Union |
publishDate |
2003 |
url |
https://authors.library.caltech.edu/62891/ https://authors.library.caltech.edu/62891/1/grl16364.pdf https://resolver.caltech.edu/CaltechAUTHORS:20151214-134828694 |
geographic |
Antarctic Greenland |
geographic_facet |
Antarctic Greenland |
genre |
Antarc* Antarctic Greenland Greenland ice core ice core |
genre_facet |
Antarc* Antarctic Greenland Greenland ice core ice core |
op_relation |
https://authors.library.caltech.edu/62891/1/grl16364.pdf Colussi, A. J. and Hoffmann, M. R. (2003) In situ photolysis of deep ice core contaminants by Çerenkov radiation of cosmic origin. Geophysical Research Letters, 30 (4). Art. No. 1195. ISSN 0094-8276. doi:10.1029/2002GL016112. https://resolver.caltech.edu/CaltechAUTHORS:20151214-134828694 <https://resolver.caltech.edu/CaltechAUTHORS:20151214-134828694> |
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other |
op_doi |
https://doi.org/10.1029/2002GL016112 |
container_title |
Geophysical Research Letters |
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30 |
container_issue |
4 |
_version_ |
1766264863887196160 |