... of naturally seeped oil into sinking particles. Determination of post-spill baselines for these isotopic signatures allows for evaluation of anthropogenic inputs in future. We collected sedimented material (sinking POM) between 2010 and 2016 at three sites in the northern Gulf of Mexico (Figure 1...

... isotopes (δ 13 CO and δC 18 O) in air during the winters of 2013–14 and 2014–15 at tall tower sampling sites in and around Indianapolis, USA. A tower located upwind of the city was used to quantitatively remove the background CO signal, allowing for the first unambiguous isotopic characterization...

...Sae Yun Kwon; Joel D. Blum; Daniel J. Madigan; Barbara A. Block; Brian N. Popp; Jody W. Deming; Tamar Barkay Analyses of mercury (Hg) isotope ratios in fish tissues are used increasingly to infer sources and biogeochemical processes of Hg in natural aquatic ecosystems. Controlled experiments...