Methane concentration and delta deuterium of methane from the NGRIP ice core ...

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(CH...

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Bibliographic Details
Main Authors: Bock, Michael, Schmitt, Jochen, Möller, Lars, Spahni, Renato, Blunier, Thomas, Fischer, Hubertus
Format: Dataset
Language:English
Published: PANGAEA 2010
Subjects:
Sample code/label
DEPTH, ice/snow
Gas age
Methane
δ Deuterium, methane
Ice drill
Gas chromatography
Mass spectrometry
NGRIP
Sampling/drilling ice
North Greenland Ice Core Project NGRIP
Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158
Arctic
Antarctic
Greenland
Antarc*
Greenland ice core
Greenland Ice core Project
ice core
Methane hydrate
North Greenland
North Greenland Ice Core Project
Sea ice
Online Access:https://dx.doi.org/10.1594/pangaea.756715
https://doi.pangaea.de/10.1594/PANGAEA.756715
Description
Summary: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. ... : 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.4429Please 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. ...

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