Max Planck Gesellschaft



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

Radiocarbon Short Course in Irvine - August 2019

ISRaD - the International Soil Radiocarbon Database

See the ISRad web page

Also see the published paper in Earth Science Data

Powell Center Meeting Participants

Recent events

  • ISRaD/Powell Center Soil Radiocarbon Workshop at LBL, Dec 5th - 8th, 2019 (organized by A. Hoyt and K
  • Urugay - Max-Planck Research Group to collaborate on Radiocarbon
  • Carlos Sierra hosts a group working on incubation database
  • ISRaD manuscript submitted to Earth and Science Data Discussions
  • EGU meeting April 2019 -- presentation of ISRaD and related content
  • SSSA meeting in San Diego, January 2019
  • AGU meeting December 2018
  • 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


1Estop-Aragonés, C., Olefeldt, D., Abbott, B. W., Chanton, J. P., Czimczik, C. I., Dean, J. F., Egan, J. E., Gandois, L., Garnett, M. H., Hartley, I. P., Hoyt, A. M., Lupascu, M., Natali, S. M., O’Donnell, J. A., Raymond, P. A., Tanentzap, A. J., Tank, S. E., Schuur, E. A. G., Turetsky, M., Anthony, K. W. (in press). Assessing the potential for mobilization of old soil carbon after permafrost thaw: A synthesis of 14C measurements from the northern permafrost region. Global Biogeochemical Cycles. doi:10.1029/2020GB006672.
2Schädel, C., Beem-Miller, J., Rad, M. A., Crow, S. E., Pries, C. H., Ernakovich, J., Hoyt, A. M., Plante, A., Stoner, S., Treat, C. C., Sierra, C. (2020). Decomposability of soil organic matter over time: the Soil Incubation Database (SIDb, version 1.0) and guidance for incubation procedures. Earth System Science Data, 12(3), 1511-1524. doi:10.5194/essd-12-1511-2020.
3Lawrence, C. R., Beem-Miller, J., Hoyt, A. M., Monroe, G., Sierra, C. A., Stoner, S., Heckman, K., Blankinship, J. C., Crow, S. E., McNicol, G., Trumbore, S. E., Levine, P. A., Vindušková, O., Todd-Brown, K., Rasmussen, C., Pries, C. E. H., Schädel, C., McFarlane, K., Doetterl, S., Hatté, C., He, Y., Treat, C., Harden, J. W., Torn, M. S., Estop-Aragonés, C., Berhe, A. A., Keiluweit, M., Kuhnen, Á. D. R., Marin-Spiotta, E., Plante, A. F., Thomson, A., Shi, Z., Schimel, J. P., Vaughn, L. J. S., von Fromm, S. F., Wagai, R. (2020). An open-source database for the synthesis of soil radiocarbon data: International Soil Radiocarbon Database (ISRaD) version 1.0. Earth System Science Data, 12(1), 61-76. doi:10.5194/essd-12-61-2020.
4Shi, Z., Allison, S. D., He, Y., Levine, P. A., Hoyt, A. M., Beem-Miller, J., Zhu, Q., Wieder, W. R., Trumbore, S. E., Randerson, J. T. (2020). The age distribution of global soil carbon inferred from radiocarbon measurements. Nature Geoscience, 13, 555-559. doi:10.1038/s41561-020-0596-z.
5Metzler, H., Zhu, Q., Riley, W., Hoyt, A. M., Müller, M., Sierra, C. (2020). Mathematical reconstruction of land carbon models from their numerical output: computing soil radiocarbon from 12C dynamics. Journal of Advances in Modeling Earth Systems, 12(1): e2019MS001776. doi:10.1029/2019MS001776.
6Gandois, L., Hoyt, A. M., Hatté, C., Jeanneau, L., Teisserenc, R., Liotaud, M., Tananaev, N. (2019). Contribution of peatland permafrost to dissolved organic matter along a thaw gradient in North Siberia. Environmental Science & Technology, 53(24), 14165-14174. doi:10.1021/acs.est.9b03735.
7Chen, J., Zhu, Q., Riley, W. J., He, Y., Randerson, J. T., Trumbore, S. E. (2019). Comparison with global soil radiocarbon observations indicates needed carbon cycle improvements in the E3SM land model. Journal of Geophysical Research: Biogeosciences, 124(5), 1098-1114. doi:10.1029/2018JG004795.
8Drake, T. W., Oost, K. V., Barthel, M., Bauters, M., Hoyt, A. M., Podgorski, D. C., Six, J., Boeckx, P., Trumbore, S. E., Ntaboba, L. C., Spencer, R. G. M. (2019). Mobilization of aged and biolabile soil carbon by tropical deforestation. Nature Geoscience, 12(7), 541-546. doi:10.1038/s41561-019-0384-9.
9Schwab, V. F., Nowak, M., Elder, C. D., Trumbore, S. E., Xu, X., Gleixner, G., Lehmann, R., Pohnert, G., Muhr, J., Kuesel, K., Totsche, K. U. (2019). 14C-free carbon is a major contributor to cellular biomass in geochemically distinct groundwater of shallow sedimentary bedrock aquifers. Water Resources Research, 55(3), 2104-2121. doi:10.1029/2017WR022067.
10Sierra, C. A., Hoyt, A. M., He, Y., Trumbore, S. E. (2018). Soil organic matter persistence as a stochastic process: age and transit time distributions of carbon in soils. Global Biogeochemical Cycles, 32(10), 1574-1588. doi:10.1029/2018GB005950.
11Nagy, R. C., Porder, S., Brando, P., Davidson, E. A., Figueira, A. M. e. S., Neill, C., Riskin, S., Trumbore, S. E. (2018). Soil carbon dynamics in soybean cropland and forests in Mato Grosso, Brazil. Journal of Geophysical Research: Biogeosciences, 123(1), 18-31. doi:10.1002/2017JG004269.

Funded by ERC Advanced Grant
Directions | Disclaimer | Data Protection | Contact | Internal | Webmail | Local weather | PRINT | © 2011-2020 Max Planck Institute for Biogeochemistry