By establishing pathways of regionally varying hydrogen isotopes found in permafrost ground ice to methane produced in thermokarst lakes, Brosius et al. reconciled bottom-up estimates of emission of methane from thermokarst lakes in various Arctic regions with isotope constraints from ice core records;...
Impacts of high atmospheric greenhouse gas levels The rapidly rising concentrations of greenhouse gases (GHGs) are worrying news for the planet, as they contribute to the climate crisis. GHGs like CO₂, methane, and nitrous oxide trap heat radiating from the planet’s surface, preventing it fro...
Atmospheric methane growth reached an exceptionally high rate of 15.1 ± 0.4 parts per billion per year in 2020 despite a probable decrease in anthropogenic methane emissions during COVID-19 lockdowns1. Here we quantify changes in methane sources and in its atmospheric sink in 2020 compared...
Atmospheric methane growth reached an exceptionally high rate of 15.1 ± 0.4 parts per billion per year in 2020 despite a probable decrease in anthropogenic methane emissions during COVID-19 lockdowns1. Here we quantify changes in methane sources and in its atmospheric sink in 2020 compared...
of the planetary boundary layer was not nudged. The model runs were atmosphere-only runs with prescribed sea surface temperatures (SSTs). CO2is not emitted but set to a constant field, while methane, CFCs, and N2O are prescribed with constant lower boundary conditions, all at 2014 levels63. ...
The primary greenhouse gases in Earth’s atmosphere are water vapor, carbon dioxide, methane, nitrous oxide, and ozone. Without greenhouse gases, the average temperature of Earth’s surface would be about -18 °C (0 °F), rather than the present average of 15 °C (59 °F)....
The results place constraints on preindustrial methane emissions from these sources. Key Points First measurements of ethane in polar ice cores Preindustrial atmospheric ethane levels significantly lower than today Geologic emissions are the largest sources of atmospheric ethane in the preindustrial ...
Atmospheric methane oxidizing bacteria (atmMOB) constitute the sole biological sink for atmospheric methane. Still, the physiological basis allowing atmMOB to grow on air is not well understood. Here we assess the ability and strategies of seven methanot
Analyzing source apportioned methane in northern California during Discover-AQ-CA using airborne measurements and model simulations Matthew S. Johnson, Emma L. Yates, Laura T. Iraci, Max Loewenstein, ... Marc L. Fischer Pages 248-256 View PDF Article preview select article Seasonal and spatial va...
Spectral analyses indicate that the long-term variability in atmospheric methane levels is dominated by ∼100,000 yr glacial–interglacial cycles up to ∼400,000 yr ago with an increasing contribution of the precessional component during the four more recent climatic cycles. We suggest that ...