14CH4 Measurements in Greenland Ice: Investigating Last Glacial Termination CH4 Sources

  title={14CH4 Measurements in Greenland Ice: Investigating Last Glacial Termination CH4 Sources},
  author={V. V. Petrenko and Andrew M. Smith and Edward J. Brook and David C. Lowe and Katja Riedel and Gordon W. Brailsford and Quan Hua and Hinrich Schaefer and Niels Reeh and Ray F. Weiss and David M. Etheridge and Jeffrey P. Severinghaus},
  pages={506 - 508}
Radiocarbon measurements show that wetlands were responsible for the rapid increase of atmospheric methane concentration during the last deglaciation. Methane from Wetlands At the end of the cold climate interval called the Younger Dryas, approximately 11,600 years ago, global temperatures began their final ascent to the warmth of the Holocene, and the concentration of methane in the atmosphere increased rapidly and substantially. There has been much speculation about the cause of that increase… 

Enrichment in 13 C of atmospheric CH 4 during the Younger Dryas termination

The abrupt warming across the Younger Dryas termination (~11 600 yr before present) was marked by a large increase in the global atmospheric methane mixing ratio. The debate over sources responsible

Role of Megafauna and Frozen Soil in the Atmospheric CH4 Dynamics

It is concluded that the Late Quaternary Extinction significantly affected the global methane cycle and affected the dynamics of all main methane sources.

Atmospheric methane control mechanisms during the early Holocene

Abstract. Understanding processes controlling the atmospheric methane (CH4) mixing ratio is crucial to predict and mitigate future climate changes in this gas. Despite recent detailed studies of the

Repeated pulses of vertical methane flux recorded in glacial sediments from the southeast Bering Sea

[1] There is controversy over the role of marine methane hydrates in atmospheric methane concentrations and climate change during the last glacial period. In this study of two sediment cores from the

Minimal geological methane emissions during the Younger Dryas–Preboreal abrupt warming event

To the extent that the characteristics of the most recent deglaciation and the Younger Dryas–Preboreal warming are comparable to those of the current anthropogenic warming, the measurements suggest that large future atmospheric releases of methane from old carbon sources are unlikely to occur.

in shallow Greenland firn

Measurements of radiocarbon ( 14 C) in carbon dioxide (CO2), methane (CH4) and carbon monoxide (CO) from glacial ice are potentially useful for absolute dating of ice cores, studies of the past

Glacial/interglacial wetland, biomass burning, and geologic methane emissions constrained by dual stable isotopic CH4 ice core records

Dual stable isotopic methane records from four Antarctic ice cores provide improved constraints on past changes in natural methane sources and show that tropical wetlands and seasonally inundated floodplains are most likely the controlling sources of atmospheric methane variations for the current and two older interglacials and their preceding glacial maxima.

Greenhouse gases in the Earth system: a palaeoclimate perspective

  • E. Wolff
  • Environmental Science, Geography
    Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
  • 2011
The phasing of changes in temperature and CO2 across glacial/interglacial transitions is consistent with the idea that CO2 acts as an important amplifier of climate changes in the natural system, and should be used to constrain assessments of the way the Earth could respond to higher than present concentrations of CO2.



Synchronous changes in atmospheric CH4 and Greenland climate between 40 and 8 kyr BP

ICE-CORE reconstructions of atmospheric methane concentrations for the past 220 kyr have revealed large variations associated with different climatic periods1–4. But the phase relationship between

On the origin and timing of rapid changes in atmospheric methane during the Last Glacial Period

We present high resolution records of atmospheric methane from the GISP2 (Greenland Ice Sheet Project 2) ice core for four rapid climate transitions that occurred during the past 50 ka: the end of

Changing boreal methane sources and constant biomass burning during the last termination

An ice core record of carbon isotopic ratios in methane over the entire last glacial–interglacial transition shows that the carbon in atmospheric methane was isotopically much heavier in cold climate periods, and the atmospheric lifetime of methane is reduced duringcold climate periods.

Thermokarst Lakes as a Source of Atmospheric CH4 During the Last Deglaciation

It is found that CH4 bubbling from newly forming thermokarst lakes comprised 33 to 87% of the high-latitude increase in atmospheric methane concentration and, in turn, contributed to the climate warming at the Pleistocene-Holocene transition.

Methane hydrate stability and anthropogenic climate change

Abstract. Methane frozen into hydrate makes up a large reservoir of potentially volatile carbon below the sea floor and associated with permafrost soils. This reservoir intuitively seems precarious,

A novel method for obtaining very large ancient air samples from ablating glacial ice for analyses of methane radiocarbon

Abstract We present techniques for obtaining large (∼100 L STP) samples of ancient air for analysis of 14C of methane (14CH4)and other trace constituents. Paleoatmospheric 14CH4 measurements should

The end of the ice age

  • E. Nisbet
  • Environmental Science, Geography
  • 1990
Methane-gas hydrates may have contributed to the rapid rise in atmospheric CH4, CO2, and global temperatures at the end of the last major glaciation about 13 500 years ago. Given suitable orbital

Ice Record of δ13C for Atmospheric CH4 Across the Younger Dryas-Preboreal Transition

Constant δ13CH4 during the rise in methane concentration at the YD-PB transition is consistent with additional emissions from tropical wetlands, or aerobic plant CH4 production, or with a multisource scenario.

The isotopic composition of atmospheric methane

Measurements of the 13C/12C, D/H and 14C composition of atmospheric methane (CH4) between 1988 and 1995 are presented. The 13C/12C measurements represent the first global data set with time series