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Bock, Michael; Schmitt, Jochen; Möller, Lars; Spahni, Renato; Blunier, Thomas; Fischer, Hubertus (2010): Methane concentration and delta deuterium of methane from the NGRIP ice core. PANGAEA,, Supplement to: Bock, M et al. (2010): Hydrogen isotopes preclude marine hydrate CH4 emissions at the onset of Dansgaard-Oeschger Events. Science, 328(5986), 1686-1689,

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The causes of past changes in the global methane cycle and especially the role of marine methane hydrate (clathrate) destabilization events are a matter of debate. Here we present evidence from the North Greenland Ice Core Project ice core based on the hydrogen isotopic composition of methane [dD(CH4)] that clathrates did not cause atmospheric methane concentration to rise at the onset of Dansgaard-Oeschger (DO) events 7 and 8. Box modeling supports boreal wetland emissions as the most likely explanation for the interstadial increase. Moreover, our data show that dD(CH4) dropped 500 years before the onset of DO 8, with CH4 concentration rising only slightly. This can be explained by an early climate response of boreal wetlands, which carry the strongly depleted isotopic signature of high-latitude precipitation at that time.
German Science Foundation (DFG), grant/award no. 5472008: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Latitude: 75.100000 * Longitude: -42.320000
Date/Time Start: 1996-07-01T00:00:00 * Date/Time End: 1996-07-01T00:00:00
Minimum DEPTH, ice/snow: 1993.48 m * Maximum DEPTH, ice/snow: 2129.88 m
NGRIP (NorthGRIP) * Latitude: 75.100000 * Longitude: -42.320000 * Date/Time: 1996-07-01T00:00:00 * Elevation: 2917.0 m * Location: Greenland * Campaign: NGRIP * Basis: Sampling/drilling ice * Method/Device: Ice drill (ICEDRILL)
Uncertainty for dD of CH4 is 3.4 per mil as derived from standard measurements as described in: Bock, M. et al., 2010, doi:10.1002/rcm.4429
Please note, that the concentration data given here have a higher error (of 29 ppbv 1-sigma) compared to conventional methods due to the uncertainty of total air content determination of the dD isotope system.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Sample code/labelSample labelBock, MichaelBag number
2DEPTH, ice/snowDepth ice/snowmGeocode
3Gas ageGas ageka BPBock, Michaelbased on age model GICC05
4MethaneCH4ppbvBock, MichaelGas chromatography
5δ Deuterium, methaneδD CH4‰ SMOWBock, MichaelMass spectrometryas measured, with respect to VSMOW, 1-sigma uncertainty of dD of CH4: 3.4 per mil
6δ Deuterium, methaneδD CH4‰ SMOWBock, MichaelMass spectrometrycorrected using d15N, with respect to VSMOW, 1-sigma uncertainty of dD of CH4: 3.4 per mil
288 data points

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