under a Creative Commons License. Atmospheric Chemistry and Physics Evidence for a CO increase in the SH during the 20th century based
Abstract. Trends of carbon monoxide (CO) for the past 100 years are reported as derived from Antarctic firn drilling ex-peditions. Only one of 3 campaigns provided high quality results. The trend was reconstructed using a firn air model in the forward mode to constrain age distributions and assum-in...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
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2006
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.592.5324 http://hal.archives-ouvertes.fr/docs/00/32/84/78/PDF/acp-7-295-2007.pdf |
| Summary: | Abstract. Trends of carbon monoxide (CO) for the past 100 years are reported as derived from Antarctic firn drilling ex-peditions. Only one of 3 campaigns provided high quality results. The trend was reconstructed using a firn air model in the forward mode to constrain age distributions and assum-ing the CO increase to be proportional to its major source, namely CH4. The results suggest that CO has increased by ∼38%, from 38±7 to 52.5±1.5 ppbv over a period of roughly 100 years. The concentrations are on the volu-metric scale which corresponds to ∼1.08 of the scale used by NOAA/CMDL. The estimated CO increase is somewhat larger than what is estimated from the CO budget estima-tions and the CH4 growth alone. The most likely explanation might be an increase in biomass burning emissions. Using CH3Cl as another proxy produces a very similar reconstruc-tion. 1 |
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