Entries by Laurence Yeung

Marine Chemistry: Kinetic and equilibrium fractionation of O2 isotopologues during air-water gas transfer and implications for tracing oxygen cycling in the ocean

February 22, 2019 /0 Comments/in /by

Boda Li, Laurence Y. Yeung, Huanting Hu, and Jeanine L. Ash Abstract Oxygen isotopologues are useful tools for understanding biogeochemical processes and chemical budgets in the ocean. For example, the triple‑oxygen isotope composition of dissolved oxygen in the ocean mixed layer (i.e., its δ17O and δ18O values) is widely used to estimate gross oxygen productivity […]

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

August 10, 2018 /0 Comments/in /by

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

November 7, 2017 /0 Comments/in /by

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

January 13, 2017 /0 Comments/in /by

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

February 18, 2016 /0 Comments/in /by

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

October 18, 2015 /0 Comments/in /by

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 […]