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Unexpected changes to the global methane budget over the past 2000 years
Citation
Ferretti, DF and Miller, JB and White, JWC and Etheridge, DM and Lassey, KR and Lowe, DC and MacFarling Meure, CM and Dreier, MF and Trudinger, CM and van Ommen, TD and Langenfelds, RL, Unexpected changes to the global methane budget over the past 2000 years, Science, 309, (5741) pp. 1714-1717. ISSN 0036-8075 (2005) [Refereed Article]
DOI: doi:10.1126/science.1115193
Abstract
We report a 2000-year Antarctic ice-core record of stable carbon isotope measurements in atmospheric methane (delta13CH4). Large delta13CH4 variations indicate that the methane budget varied unexpectedly during the late preindustrial Holocene (circa 0 to 1700 A.D.). During the first thousand years (0 to 1000 A.D.), delta13CH4 was at least 2 per mil enriched compared to expected values, and during the following 700 years, an about 2 per mil depletion occurred. Our modeled methane source partitioning implies that biomass burning emissions were high from 0 to 1000 A.D. but reduced by almost approximately 40% over the next 700 years. We suggest that both human activities and natural climate change influenced preindustrial biomass burning emissions and that these emissions have been previously understated in late preindustrial Holocene methane budget research.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Research Division: | Earth Sciences |
| Research Group: | Geology |
| Research Field: | Marine Geoscience |
| Objective Division: | Environment |
| Objective Group: | Ecosystem Assessment and Management |
| Objective Field: | Ecosystem Assessment and Management of Marine Environments |
| UTAS Author: | van Ommen, TD (Dr Tas van Ommen) |
| ID Code: | 112096 |
| Year Published: | 2005 |
| Web of Science® Times Cited: | 181 |
| Deposited By: | CRC-Antarctic Climate & Ecosystems |
| Deposited On: | 2016-10-26 |
| Last Modified: | 2016-10-26 |
| Downloads: | 0 |
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