Upward revision of global fossil fuel methane emissions based on isotope database

  title={Upward revision of global fossil fuel methane emissions based on isotope database},
  author={Stefan Schwietzke and Owen A. Sherwood and Lori Bruhwiler and J B Miller and Giuseppe Etiope and Edward J. Dlugokencky and Sylvia E. Michel and Victoria A. Arling and Bruce H. Vaughn and James W. C. White and Pieter P. Tans},
Methane has the second-largest global radiative forcing impact of anthropogenic greenhouse gases after carbon dioxide, but our understanding of the global atmospheric methane budget is incomplete. The global fossil fuel industry (production and usage of natural gas, oil and coal) is thought to contribute 15 to 22 per cent of methane emissions to the total atmospheric methane budget. However, questions remain regarding methane emission trends as a result of fossil fuel industrial activity and… 
Biogeochemistry: Rebalancing the global methane budget
  • G. Allen
  • Environmental Science, Medicine
  • 2016
The re-evaluate of the global methane budget and the contribution of the fossil fuel industry to methane emissions on the basis of long-term global methane and methane carbon isotope records finds that total fossil fuel methane emissions are not increasing over time, but are 60–110% greater than was previously thought.
Relevant methane emission to the atmosphere from a geological gas manifestation.
Significant geological CH4 emissions from the Lusi hydrothermal system (Indonesia) are reported, measured by ground-based and satellite (TROPOMI) techniques, equivalent to the minimum value of global geo-emission derived by ice core 14CH4 estimates.
Old carbon reservoirs were not important in the deglacial methane budget
Ice core isotopic measurements of methane from the last deglaciation are presented, which is a partial analog for modern warming and show that methane emissions from old carbon reservoirs in response to deglacial warming were small and argue against similar methane emissions in responseto future warming.
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.
Global Inventory of Gas Geochemistry Data from Fossil Fuel, Microbial and Burning Sources, version 2017
Abstract. The concentration of atmospheric methane (CH4) has more than doubled over the industrial era. To help constrain global and regional CH4 budgets, inverse (top-down) models incorporate data
Reduced biomass burning emissions reconcile conflicting estimates of the post-2006 atmospheric methane budget
It is shown that biomass burning emissions of methane decreased by 3.7 (±1.4) Tg CH4 per year from the 2001–2007 to the 2008–2014 time periods using satellite measurements of CO and CH4, nearly twice the decrease expected from prior estimates.
Forecasting of regional methane from coal mine emissions in the Upper Silesian Coal Basin using the on-line nested global regional chemistry climate model MECO(n)(MESSy v2.53)
Abstract. Methane is the second most important greenhouse gas in terms of anthropogenic radiative forcing. Since pre-industrial times, the globally averaged dry mole fraction of methane in the
Isotopic Ratios of Tropical Methane Emissions by Atmospheric Measurement
Tropical methane sources are an important part of the global methane budget and include natural wetlands, rice agriculture, biomass burning, ruminants, fossil fuels, and waste. δ13CCH4 can provide
Quantifying methane emissions from the largest oil-producing basin in the United States from space
A high-resolution satellite data–based atmospheric inversion framework is demonstrated, providing a robust top-down analytical tool for quantifying and evaluating subregional methane emissions from the Permian Basin.
Effects of Chemical Feedbacks on Decadal Methane Emissions Estimates
The coupled chemistry of methane, carbon monoxide (CO), and hydroxyl radical (OH) can modulate methane's 9‐year lifetime. This is often ignored in methane flux inversions, and the impacts of


Three decades of global methane sources and sinks
Methane is an important greenhouse gas, responsible for about 20% of the warming induced by long-lived greenhouse gases since pre-industrial times. By reacting with hydroxyl radicals, methane reduces
Reappraisal of the fossil methane budget and related emission from geologic sources
Converging evidence from new top-down and bottom-up estimates of fossil "radiocarbon-free" methane emissions indicates that natural geologic sources account for a substantial component of the
Contribution of anthropogenic and natural sources to atmospheric methane variability
The results indicate that wetland emissions dominated the inter-annual variability of methane sources, whereas fire emissions played a smaller role, except during the 1997–1998 El Niño event.
A geochemial perspective of natural gas and atmospheric methane
Natural gases are key components in the description of the global carbon cycle. Although the estimated 120 Gt C reserves of natural gas are minute compared to the total carbon reservoir (c. 1.4 × 108
Global Bottom-Up Fossil Fuel Fugitive Methane and Ethane Emissions Inventory for Atmospheric Modeling
Natural gas (NG)-related fugitive methane (CH4) emissions estimates from life cycle assessments (LCA) and local field measurements are highly uncertain. Globally distributed long-term atmospheric
A 21st-century shift from fossil-fuel to biogenic methane emissions indicated by 13CH4
The atmospheric methane level has resumed its increase after a plateau between 1999 and 2006, and a box-model analysis suggests that diminishing thermogenic emissions, probably from the fossil-fuel industry, and/or variations in the hydroxyl CH4 sink caused the plateau.
Natural gas fugitive emissions rates constrained by global atmospheric methane and ethane.
NG industry representative FER is estimated using global atmospheric methane and ethane measurements over three decades, and literature ranges of tracer gas atmospheric lifetimes, non-NG source estimates, and fossil fuel fugitive gas hydrocarbon compositions suggest an upper bound global average FER of 5% during 2006-2011, and a most likely FE of 2-4% since 2000, trending downward.
Natural and anthropogenic variations in methane sources during the past two millennia
High-resolution carbon isotope data for methane from two ice cores from Greenland for the past two millennia is presented and it is found that the δ13C content underwent pronounced centennial-scale variations between 100 bc and ad 1600.
Greater focus needed on methane leakage from natural gas infrastructure
It is found that a shift to compressed natural gas vehicles from gasoline or diesel vehicles leads to greater radiative forcing of the climate for 80 or 280 yr, respectively, before beginning to produce benefits.
The atmospheric cycling of radiomethane and the "fossil fraction" of the methane source
The cycling of 14 CH4 ("radiomethane") through the atmosphere has been strongly perturbed in the industrial era by the release of 14 C-free methane from geologic reser- voirs ("fossil methane"