Continuing decline in the growth rate of the atmospheric methane burden

  title={Continuing decline in the growth rate of the atmospheric methane burden},
  author={Edward J. Dlugokencky and Kenneth A. Masarie and Patricia M. Lang and Pieter P. Tans},
The global atmospheric methane burden has more than doubled since pre-industrial times,, and this increase is responsible for about 20% of the estimated change in direct radiative forcing due to anthropogenic greenhouse-gas emissions. Research into future climate change and the development of remedial environmental policies therefore require a reliable assessment of the long-term growth rate in the atmospheric methane load. Measurements have revealed that although the global atmospheric methane… 
Estimates of changes in the rate of methane sink from the atmosphere under climate warming
The temperature dependence of the methane oxidation rate is estimated. The methane lifetime in the atmosphere is shown to decrease by about 3% from 1900 to 2005. The overwhelming fraction of the
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
Atmospheric methane and global change
The Drivers of Atmospheric Methane Fluctuations over the Last Three Decades
Understanding the processes behind the observed methane fluctuations over the last three decades is crucial for reliable projections of future levels of atmospheric methane, the second most important
Implications of the recent fluctuations in the growth rate of tropospheric methane
Global measurements show that the mixing ratio of tropospheric methane (CH4) increased by 1.1% (19.5 ± 1.7 ppbv) over the five‐year period 1996–2000, with striking fluctuations in its annual growth
Relating interannual variability of atmospheric CH 4 growth rate to large-scale CH 4 emissions from northern wetlands
The increasing atmospheric concentration of the greenhouse gas methane (CH4) is highly relevant for current and future global warming. Since the mid-1980s atmospheric measurements have revealed
Atmospheric methane levels off: Temporary pause or a new steady‐state?
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 methane
Climate versus emission drivers of methane lifetime against loss by tropospheric OH from 1860-2100
Abstract. With a more-than-doubling in the atmospheric abundance of the potent greenhouse gas methane (CH4) since preindustrial times, and indications of renewed growth following a leveling off in
Global annual methane emission rate derived from its current atmospheric mixing ratio and estimated lifetime
Abstract. We use the estimated lifetime of methane (CH4), the current methane concentration, and its annual growth rate to calculate the global methane emission rate. The upper and lower limits of
Sources and Sinks of Methane.Future Concentrations and Impact on Global Warming.
There has been an average increase in the surface temperature of the earth by 0.6 ± 0.2oC over the 20th century (IPCC, 2001). This increase in the surface temperature of the earth is attributed to


Slowing down of the global accumulation of atmospheric methane during the 1980s
MEASUREMENTS of methane in modern air1–8 and in air trapped in ice cores9–12 have shown convincingly that the abundance of atmospheric methane has been rising since the Industrial Revolution. This is
Effect of ozone depletion on atmospheric CH4 and CO concentrations
GLOBAL surface-based measurements of atmospheric methane and carbon monoxide concentrations revealed a marked and unex-pected decrease in their growth rates in 1991 and 1992, particularly in the
Comment on ‘A dramatic decrease in the growth rate of atmospheric methane in the northern hemisphere during 1992' by E. J. Dlugokencky et al.
The carefully measured decrease in the growth rate of atmospheric methane (CH4) in 1992 reported by Dlugokencky et al. (1994) is an impressive accomplishment, and testimony for the importance of
Concentration and 13C records of atmospheric methane in New Zealand and Antarctica: Evidence for changes in methane sources
Measurements of 13C in atmospheric methane made at Baring Head, New Zealand (41°S), over the 4-year period, 1989–1993, display a persistent but highly variable seasonal cycle. Values for δ13C peak in
Decreasing trend of methane: Unpredictability of future concentrations
The growth rate and distribution of atmospheric methane
Methane was measured in air samples collected approximately weekly from a globally distributed network of sites from 1983 to 1992. Sites range in latitude from 90°S to 82°N. All samples were analyzed
A dramatic decrease in the growth rate of atmospheric methane in the northern hemisphere during 1992
Global measurements of atmospheric methane have revealed a sharp decrease in the growth rate in the Northern Hemisphere during 1992. The average trend for the Northern Hemisphere during 1983–1991 was
Three‐dimensional model synthesis of the global methane cycle
The geographic and seasonal emission distributions of the major sources and sinks of atmospheric methane were compiled using methane flux measurements and energy and agricultural statistics in
Sensitivity of the CH4 growth rate to changes in CH4 emissions from natural gas and coal
The observed rate of increase in atmospheric CH4 declined gradually during the late 1980s [Steele et al., 1992] and then fell dramatically by ∼4 to 7 parts per billion by volume (ppbv) yr−1 from 1991
Changes in CH4 and CO growth rates after the eruption of Mt. Pinatubo and their link with changes in tropical tropospheric UV flux
Trace gas measurements from air samples collected weekly at a globally distributed network of sampling sites revealed sharp increases in the growth rates of CH4 and CO in the tropics and high