Long-term decline of global atmospheric ethane concentrations and implications for methane

@article{Simpson2012LongtermDO,
  title={Long-term decline of global atmospheric ethane concentrations and implications for methane},
  author={Isobel J. Simpson and Mads P. Sulbaek Andersen and Simone Meinardi and Lori Bruhwiler and Nicola J. Blake and Detlev Helmig and F. Sherwood Rowland and Donald Ray Blake},
  journal={Nature},
  year={2012},
  volume={488},
  pages={490-494}
}
After methane, ethane is the most abundant hydrocarbon in the remote atmosphere. It is a precursor to tropospheric ozone and it influences the atmosphere’s oxidative capacity through its reaction with the hydroxyl radical, ethane’s primary atmospheric sink. Here we present the longest continuous record of global atmospheric ethane levels. We show that global ethane emission rates decreased from 14.3 to 11.3 teragrams per year, or by 21 per cent, from 1984 to 2010. We attribute this to… Expand
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 reducesExpand
Reversal of global atmospheric ethane and propane trends largely due to US oil and natural gas production
Atmospheric non-methane hydrocarbon concentrations began declining in the 1970s. Surface and column measurements show that Northern Hemisphere ethane concentrations are now rising, probably due toExpand
Natural gas fugitive emissions rates constrained by global atmospheric methane and ethane.
TLDR
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. Expand
Global atmospheric ethane, propane and methane trends (2006–2016)
Abstract. Methane, ethane and propane are among the most abundant hydrocarbons in the atmosphere. These compounds have many emission sources in common and are all primarily removed through OHExpand
Temporary pause in the growth of atmospheric ethane and propane in 2015–2018
Abstract. Atmospheric non-methane hydrocarbons (NMHCs) play an important role in the formation of secondary organic aerosols and ozone. After a multidecadal global decline in atmospheric moleExpand
A 21st-century shift from fossil-fuel to biogenic methane emissions indicated by 13CH4
TLDR
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. Expand
Temporary pause in the growth of atmospheric ethane and propane in 2015–2018
Abstract. Atmospheric non-methane hydrocarbons (NMHCs) play an important role in the formation of secondary organic aerosols and ozone. After a multidecade global decline in atmospheric moleExpand
Discrepancy between simulated and observed ethane and propane levels explained by underestimated fossil emissions
Ethane and propane are the most abundant non-methane hydrocarbons in the atmosphere. However, their emissions, atmospheric distribution, and trends in their atmospheric concentrations areExpand
Revisiting global fossil fuel and biofuel emissions of ethane
Recent measurements over the Northern Hemisphere indicate that the long-term decline in the atmospheric burden of ethane (C2H6) has ended and the abundance increased dramatically between 2010 andExpand
The global methane budget 2000–2012
Abstract. The global methane (CH4) budget is becoming an increasingly important component for managing realistic pathways to mitigate climate change. This relevance, due to a shorter atmosphericExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 36 REFERENCES
Recent decreases in fossil-fuel emissions of ethane and methane derived from firn air
TLDR
Measurements in firn (perennial snowpack) air from Greenland and Antarctica are used to reconstruct the atmospheric variability of ethane (C2H6) during the twentieth century, finding that this variability was primarily driven by changes in ethane emissions from fossil fuels. Expand
Contribution of anthropogenic and natural sources to atmospheric methane variability
TLDR
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. Expand
Extensive regional atmospheric hydrocarbon pollution in the southwestern United States
TLDR
Measured alkyl nitrate mixing ratios were comparable to urban smog values, indicating active photochemistry in the presence of nitrogen oxides, and therefore with abundant formation of tropospheric ozone. Expand
Reduced methane growth rate explained by decreased Northern Hemisphere microbial sources
TLDR
It is shown that the late-twentieth-century changes in the CH4 growth rates are best explained by reduced microbial sources in the Northern Hemisphere, and observations in the interhemispheric difference of 13C effectively exclude reduced fossil fuel emissions as the primary cause of the slowdown. Expand
Global atmospheric concentrations and source strength of ethane
Ethane (C2H6), like other gaseous hydrocarbons, contributes significantly to the chemistry of the lower atmosphere, chiefly through reactions with the OH (hydroxyl) radical, an important troposphericExpand
Influence of biomass burning during recent fluctuations in the slow growth of global tropospheric methane
[1] During the past 15 years the annual growth rate of tropospheric methane (CH4) has shown striking changes over 2–3 year periods, varying from +1% yr−1 to slightly negative values (−0.2% yr−1).Expand
Global Budget of Ethane and Regional Constraints on U.S. Sources
[1] We use a 3-D chemical transport model (the GEOS-Chem CTM) to evaluate a global emission inventory for ethane (C2H6), with a best estimate for the global source of 13 Tg yr−1, 8.0 Tg yr−1 fromExpand
Earth's Degassing: A Missing Ethane and Propane Source
TLDR
Evidence is provided that a substantial part of the missing source can be attributed to natural gas seepage from petroliferous, geothermal, and volcanic areas, which accounts for at least 17% and 10% of total ethane and propane emissions, respectively. Expand
Atmospheric methane levels off: Temporary pause or a new steady-state?
[1] The globally-averaged atmospheric methane abundance determined from an extensive network of surface air sampling sites was constant at ∼1751 ppb from 1999 through 2002. Assuming that the methaneExpand
Global wildland fire emissions from 1960 to 2000
In many regions of the world, fires are an important and highly variable source of air pollutant emissions, and they thus constitute a significant if not dominant factor controlling the interannualExpand
...
1
2
3
4
...