Carbon isotope ratios suggest no additional methane from boreal wetlands during the rapid Greenland Interstadial 21.2. Issue 11 (30th November 2015)

• Record Type: Journal Article
• Authors: Sperlich, Peter; Schaefer, Hinrich; Mikaloff Fletcher, Sara E.; Guillevic, Myriam; Lassey, Keith; Sapart, Célia J.; Röckmann, Thomas; Blunier, Thomas
• Is Part Of: Global biogeochemical cycles. Volume 29:Issue 11(2015:Nov.)
• Page Start: 1962
• Page End: 1976
• Publication Date: 2015-11-30
• Subjects: methane -- carbon isotopes -- ice cores -- precipitation -- boreal wetlands -- tropical wetlands; Biogeochemical cycles -- Periodicals; Electronic journals; 577.1405
• DOI: 10.1002/2014GB005007
• Languages: English
• ISSNs: 0886-6236

Abstract

Abstract: Samples from two Greenland ice cores (NEEM and NGRIP) have been measured for methane carbon isotope ratios ( δ 13 C‐CH4 ) to investigate the CH4 mixing ratio anomaly during Greenland Interstadial (GI) 21.2 (85, 000 years before present). This extraordinarily rapid event occurred within 150 years, comprising a CH4 mixing ratio pulse of 150 ppb (∼25%). Our new measurements disclose a concomitant shift in δ 13 C‐CH4 of 1‰. Keeling plot analyses reveal the δ 13 C of the additional CH4 source constituting the CH4 anomaly as −56.8 ± 2.8‰, which we confirm by means of a previously published box model. We propose tropical wetlands as the most probable additional CH4 source during GI‐21.2 and present independent evidence that suggests that tropical wetlands in South America and Asia have played a key role. We find no evidence that boreal CH4 sources, such as permafrost degradation, contributed significantly to the atmospheric CH4 increase, despite the pronounced warming in the Northern Hemisphere during GI‐21.2. Key Points: We present a δ 13 C record of the rapid CH4 variation 85ka before present We apply Keeling plot analysis and validate the results against a box model We propose that tropical wetland emissions caused the observed CH4 anomaly