Nonequilibrium clumped isotope signals in microbial methane

Author:

Wang David T.12,Gruen Danielle S.12,Lollar Barbara Sherwood3,Hinrichs Kai-Uwe4,Stewart Lucy C.5,Holden James F.5,Hristov Alexander N.6,Pohlman John W.7,Morrill Penny L.8,Könneke Martin4,Delwiche Kyle B.9,Reeves Eoghan P.1,Sutcliffe Chelsea N.3,Ritter Daniel J.10,Seewald Jeffrey S.2,McIntosh Jennifer C.10,Hemond Harold F.9,Kubo Michael D.11,Cardace Dawn12,Hoehler Tori M.11,Ono Shuhei1

Affiliation:

1. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

2. Marine Chemistry and Geochemistry Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA.

3. Department of Earth Sciences, University of Toronto, Toronto, Ontario M5S 3B1, Canada.

4. MARUM Center for Marine Environmental Sciences and Department of Geosciences, University of Bremen, Bremen D-28359, Germany.

5. Department of Microbiology, University of Massachusetts, Amherst, MA 01003, USA.

6. Department of Animal Science, Pennsylvania State University, University Park, PA 16802, USA.

7. U.S. Geological Survey (USGS), Woods Hole Coastal and Marine Science Center, Woods Hole, MA 02543, USA.

8. Department of Earth Sciences, Memorial University of Newfoundland, St John’s, Newfoundland and Labrador A1B 3X5, Canada.

9. Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

10. Department of Hydrology and Water Resources, University of Arizona, Tucson, AZ 85721, USA.

11. NASA Ames Research Center, Moffett Field, CA 94035, USA.

12. Department of Geosciences, University of Rhode Island, Kingston, RI 02881, USA.

Abstract

What controls clumped isotopes? Stable isotopes of a molecule can clump together in several combinations, depending on their mass. Even for simple molecules such as O 2 , which can contain 16 O, 17 O, and 18 O in various combinations, clumped isotopes can potentially reveal the temperatures at which molecules form. Away from equilibrium, however, the pattern of clumped isotopes may reflect a complex array of processes. Using high-resolution gas-phase mass spectrometry, Yeung et al. found that biological factors influence the clumped isotope signature of oxygen produced during photosynthesis (see the Perspective by Passey). Similarly, Wang et al. showed that away from equilibrium, kinetic effects causing isotope clumping can lead to overestimation of the temperature at which microbially produced methane forms. Science , this issue p. 431; p. 428; see also p. 394

Funder

National Defense Science and Engineering Graduate Fellowship

Neil and Anna Rasmussen Foundation Fund

Grayce B. Kerr Fellowship

Shell-MITEI Graduate Fellowship

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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