Entries by Laurence Yeung

RCMS: Scale distortion from pressure baselines as a source of inaccuracy in triple-isotope measurements

Laurence Y. Yeung, Justin A. Hayles, Huanting Hu, Jeanine L. Ash, and Tao Sun Rapid Comm. Mass Spectrom. (2018) doi: 10.1002/rcm.8247 Rationale: Isotope ratio measurements have become extremely precise in recent years, with many approaching parts‐per‐million (ppm) levels of precision. However, seemingly innocuous errors in signal baselines, which exist only when gas enters the instrument, […]

EPSL: Low oxygen and argon in the Neoproterozoic atmosphere at 815 Ma

Laurence Y. Yeung Abstract The evolution of Earth’s atmosphere on >106>106-yr timescales is tied to that of the deep Earth. Volcanic degassing, weathering, and burial of volatile elements regulates their abundance at the surface, setting a boundary condition for the biogeochemical cycles that modulate Earth’s atmosphere and climate. The atmosphere expresses this interaction through its […]

The relative abundances of resolved 12CH2D2 and 13CH3D and mechanisms controlling isotopic bond ordering in abiotic and biotic methane gases

E. D. Young, I. E. Kohl, B. Sherwood Lollar, G. Etiope, D. Rumble III, S. Li (李姝宁), M. A. Haghnegahdar, E. A. Schauble, K. A. McCain, D. I. Foustoukos, C. Sutclife, O. Warr, C. J. Ballentine, T. C. Onstott, H.  Hosgormez, A. Neubeck, J. M. Marques, I. Pérez-Rodríguez, A. R. Rowe, D. E. LaRowe, C. […]

PNAS: Widespread collapse of the Ross Ice Shelf during the late Holocene

Widespread collapse of the Ross Ice Shelf during the late Holocene Proceedings of the National Academy of Sciences, vol. 113 no. 9, 2354–2359, doi: 10.1073/pnas.1516908113 Yusuke Yokoyama*, John B. Anderson, Masako Yamane, Lauren M. Simkins, Yosuke Miyairi, Takahiro Yamazaki, Mamito Koizumi, Hisami Suga, Kazuya Kusahara, Lindsay Prothro, Hiroyasu Hasumi, John R. Southon, and Naohiko Ohkouchi […]

Combinatorial effects on clumped isotopes and their significance in biogeochemistry

A new paper from Laurence Yeung on the fundamentals of “clumped-isotope” fractionation, was recently accepted in Geochimica et Cosmochimica Acta. It shows, through simple theoretical arguments, the factors influencing the occurrence of rare-isotope pairs in molecules when they are made. One might be able to base future tracers of biogeochemistry on these principles. One of the […]