Hydrogen Isotopes Preclude Marine Hydrate CH4 Emissions at the Onset of Dansgaard-Oeschger Events

M. Bock; J. Schmitt; L. Moeller; R. Spahni; Thomas Blunier; H. Fischer

doi:10.1126/science.1187651

Hydrogen Isotopes Preclude Marine Hydrate CH4 Emissions at the Onset of Dansgaard-Oeschger Events

M. Bock, J. Schmitt, L. Moeller, R. Spahni, Thomas Blunier, H. Fischer

46 Citationer (Scopus)

Abstract

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 [δD(CH ₄)] 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 δD(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.

Originalsprog	Engelsk
Tidsskrift	Science
Vol/bind	328
Udgave nummer	5986
Sider (fra-til)	1686-1689
Antal sider	3
ISSN	0036-8075
DOI	https://doi.org/10.1126/science.1187651
Status	Udgivet - 25 jun. 2010

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Citationsformater

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title = "Hydrogen Isotopes Preclude Marine Hydrate CH4 Emissions at the Onset of Dansgaard-Oeschger Events",

abstract = "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 [δD(CH 4)] 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 δD(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.",

author = "M. Bock and J. Schmitt and L. Moeller and R. Spahni and Thomas Blunier and H. Fischer",

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TY - JOUR

T1 - Hydrogen Isotopes Preclude Marine Hydrate CH4 Emissions at the Onset of Dansgaard-Oeschger Events

AU - Bock, M.

AU - Schmitt, J.

AU - Moeller, L.

AU - Spahni, R.

AU - Blunier, Thomas

AU - Fischer, H.

PY - 2010/6/25

Y1 - 2010/6/25

N2 - 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 [δD(CH 4)] 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 δD(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.

AB - 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 [δD(CH 4)] 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 δD(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.

U2 - 10.1126/science.1187651

DO - 10.1126/science.1187651

M3 - Journal article

SN - 0036-8075

VL - 328

SP - 1686

EP - 1689

JO - Science

JF - Science

IS - 5986

ER -

Hydrogen Isotopes Preclude Marine Hydrate CH4 Emissions at the Onset of Dansgaard-Oeschger Events

Abstract

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