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The goal of 14Constraint is to enhance the availability and use of radiocarbon data as constraints for process-based understanding of the age distribution of carbon in and respired by soils and ecosystems. A team of researchers who is envisioned who will (1) work collaboratively with others on building an open community database of 14C data; (2) fill gaps in data and understanding by making new radiocarbon measurements in soil and respired CO2, (3) use models to interpret data for improving models of soil C cycling and (4) produce global data products for comparison with models.

The 14Constraint Team

PIs: Susan Trumbore, Carlos Sierra, Marion Schrumpf
Technical support: Kerstin Lohse, Jessica Heublein, Iris Kuhlmann, The Jena 14C analysis Facility
Researchers: Alison Hoyt, Valerie Schwab, Jan Muhr
PhD students: Jeffrey Beem-Miller, Shane Stoner
Collaborating researchers
UC Irvine: Jim Randerson, Xiaomei Xu, Yujie He, Paul Levine, Zheng Shi, Steve Allison
Lawrence Berkeley Lab: Margaret Torn, Bill Riley

14Constraint at AGU 2018

Our team will be present with several post and oral presentations at this years AGU. So stop by to learn more about the project.

  • Respired Radiocarbon: Insights into decadal soil carbon cycling (B23G-2577) - Alison Hoyt
  • Beyond the First Date: Soil Incubations and the Radiocarbon Constraint (B23G-2583) - Jeffrey Beem-Miller
  • Testing Thermal Oxidation and 14C Concentration as an Analogue for Traditional Soil Fractionation Methods (B23G-2615) - Shane Stoner


  • The International Soil Radiocarbon Database (ISRaD): A new resource for the synthesis of soil radiocarbon data across scales (B33B-02) - Corey R Lawrence
  • Global carbon-14 observations constrain rates of soil organic matter decomposition in the Energy Exascale Earth System Model (B33B-03) - Paul Alexander Levine
  • Trends and Challenges in Biogeosciences (B41B-01) - Susan Trumbore
  • Radiocarbon as a Clock for the Global Carbon Cycle (B42B-03) - Susan Trumbore

Radiocarbon Short Course in Irvine - August 2019

ISRaD - the International Soil Radiocarbon Database

See the ISRad web page

Powell Center Meeting Participants

Recent events

  • Hackathon in Jena on November 15,16 and 17 2018 to get everything in shape before AGU
  • Sue, Alison and Jeff participated in the Powell Center soil carbon meeting in Fort Collins Colorado, October 8-12, 2018 and discussued collaborative activities for ISRAD.
  • 14Constraint is hosting a “hack-a-thon” the 10-17 September with colleagues from the Powell center to work on the International Soil Radiocarbon Database (IsRad) and the publication announcing it.
  • Alison Hoyt co-convening a session at AGU: B087: Timescales of Carbon Cycling in Soils: Observations, Data Synthesis and Modeling
  • June 2018 Jeff Beem-Miller gives a talk on the Radiocarbon data base at the Radiocarbon meeting in Trondheim (From Fractions to Fluxes: The International Soil Radiocarbon Database (ISRaD)
  • May-July 2018 - Visit by istván Fekete (University of Nyiregyhaza, Hungary) funded by ERC
  • March 2018 - Susan give a talk at the INRA Symposium on Earth System Function and Climate Change
  • December 2017 AGU meeting and ICSN Hackathon
  • November 2017 Powell Center Database workshop with Corey Lawrence
  • September 2017 Radiocarbon short course
  • August-October 2017 Visit by Visit by Kateřina Jandová (Charles University, Prague, Czech Republic)
  • July- August 2017 Visit by Suzanne Pierre (Cornell University, New York, USA)
  • July 2017 Installation of the new Micadas AMS system at BGC

Funded by ERC Advanced Grant
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