Rebecca Fisher

TL;DR: A factor of 2.5 increase in the global abundance of atmospheric methane (CH4) since 1750 contributes 0.5Wm2 to total direct radiative forcing by long-lived greenhouse gases (2.77Wm 2 in 2009) as discussed by the authors.

TL;DR: More than 250 plumes of gas bubbles have been discovered emanating from the seabed of the West Spitsbergen continental margin, in a depth range of 150-400 m, at and above the present upper limit of the gas hydrate stability zone (GHSZ) as mentioned in this paper.

TL;DR: The increase in the methane burden began in 2007, with the mean global mole fraction in remote surface background air rising from about 1775 ppb in 2006 to 1850 ppb by 2017, at rates not observed since the 1980s as discussed by the authors.

TL;DR: The isotopic evidence presented in this article suggests that the methane rise was dominated by significant increases in biogenic methane emissions, particularly in the tropics, for example, from expansion of tropical wetlands in years with strongly positive rainfall anomalies or emissions from increased agricultural sources such as ruminants and rice paddies.

TL;DR: In this paper, an active growing speleothem sampled from New St. Michaels Cave in 2004 is composed of paired laminae consisting of light columnar calcite and a darker microsparitic calcite.