Contact Information

The Jahren Laboratory is located

at the University of Oslo 

4th Floor, Kristine Bonnevies hus,

Blindern Campus


Mailing address:

c/o CEED, Postbox 1028 Blindern

N-0315 Oslo, Norway

Publications by Year

All peer-reviewed: * denotes student author; # denotes post-doctoral author; % denotes senior lab member.


S.V. Liu, L.B. Moore, T.M. Halliday, A.H. Jahren, J. Salva, V.E. Hendrick, E.L. Marinik and B.M. Davy. 2018. Short-term changes in added sugar consumption by adolescents reflected in the carbon isotope ratio of fingerstick blood. Nutrition and Health, 24(4):251-253. (view/download pdf)

W.M. Hagopian%, B.A. Schubert, R.A. Graper* and A.H. Jahren. 2018. Plant growth chamber design for subambient pCO2 and δ13C studies. Rapid Communications in Mass Spectrometry, DOI: 10.1002/rcm.8176kl. (view/download pdf)

C.R. MacDougall, C.E. Hill, A.H. Jahren, J. Savla, S.K. Riebl, V.E. Hedrick, H.A. Raynor, J.C. Dunsmore, M.I. Frisard and  B.M. Davy. 2018 The (δ13C) value of finger stick blood is a valid, reliable, and sensitive biomarker of sugar-sweetened beverage intake in children and adolescents. The Journal of Nutrition, 148(1): 147-152. (view/download pdf)

J.N. Bostic*, W.M. Hagopian% and A.H. Jahren. 2018. Carbon and nitrogen stable isotopes in U.S. milk: Insight into production process. Rapid Communications in Mass Spectrometry, 32(7): 561-566. (view/download pdf)

B.A. Schubert and A.H. Jahren. 2018 (Invited Review). Incorporating the effects of photorespiration into terrestrial paleoclimate reconstruction. Earth-Science Reviews, 177: 637-642. (view/download pdf)


M.T. Rabanus-Wallace, M.J. Wooller, G.D. Zazula, E. Shute, A.H. Jahren, P. Kosintsev, J.A. Burns, J. Breen, B. Llamas and A. Cooper. 2017. Megafaunal isotopes reveal role of increased moisture on rangeland during Late Pleistocene extinctions. Nature Ecology & Evolution, 1, 0125, DOI: 10.1038/s41559-017-0215. (view/download pdf)

B.A. Schubert, A.H. Jahren, S.P. Davydov and S. Warny. 2017. The transitional climate of the late Miocene Arctic: Winter dominated precipitation with high seasonal variability. Geology, DOI: 10.1130/G38746.1. (view/download pdf)


B.M. Davy and A.H. Jahren. 2016 (Invited Review). New markers of dietary added sugar intake. Current Opinion in Clinical Nutrition and Metabolic Care, 19(4): 282-288. (view/download pdf)

 B.M. Davy, A.H. Jahren, V.E. Hedrick, W. You and J.M. Zoellner. 2016. Influence of an intervention targeting a reduction in sugary beverage intake on the δ13C sugar intake biomarker in a predominantly obese, health-disparate sample. Public Health Nutrition, DOI:

V.E. Hedrick, B.M. Davy, G.A. Wilburn, A.H. Jahren and J.M. Zoellner. 2016. Evaluation of a novel biomarker of added sugar intake (δ13C) compared with self-reported added sugar intake and the Healthy Eating Index-2010 in a community-based, rural US sample. Public Health Nutrition, 19(3): 429-436. DOI: 10.1017/S136898001500107X. (view/download pdf)


T.P. McGlynn, R. Graham, J Wilson, J. Emerson, J.M. Jandt, and A.H. Jahren. 2015. Distinct types of foragers in the ant Ectatomma ruidum: typical foragers and furtive thieves. Animal Behaviour, 109: 243-247. (view/download pdf)

B.A. Schubert and A.H. Jahren. 2015. Seasonal temperature and precipitation recorded in the intra-annual oxygen isotope pattern of meteoric water and tree-ring cellulose. Quaternary Science Reviews, 125: 1-14. (view/download pdf)

V.E. Hedrick, J.M. Zoeller, A.H. Jahren, J.N. Bostic% and B.M. Davy. 2015. A dual-carbon-and-nitrogen stable isotope ratio model is not superior to a single-carbon stable isotope ratio model for predicting added sugar intake in Southwest Virginian adults. The Journal of Nutrition, DOI: 10.3945/jn.115.211011. (view/download pdf)

J.N. Bostic%, S.J. Palafox*, M.E. Rottmueller* and A.H. Jahren. 2015. Effect of baking and fermentation on the stable carbon and nitrogen isotope ratios of grain-based food. Rapid Communications in Mass Spectrometry, 29(10): 937-947. (view/download pdf)

B.A. Schubert and A.H. Jahren. 2015. Global increase in plant carbon isotope fractionation following the last glacial maximum caused by increase in atmospheric pCO2Geology, DOI: 10.1130/G36467.1. (view/download pdf)

W.M. Hagopian%, B.A. Schubert and A.H. Jahren. 2015. Large-scale plant growth chamber design for elevated pCO2 and δ13C studies. Rapid Communications in Mass Spectrometry, 29(5): 440-446. (view/download pdf)


A.H. Jahren, J.N. Bostic% and B.A. Davy. 2014 (Invited Review). The potential for a carbon stable isotope biomarker of dietary sugar intake. Journal of Analytical Atomic Spectrometry, 29(5): 795-816. (view/download pdf)

T.H.I. Fakhouri, A.H. Jahren, L.J. Appel, L. Chen, R. Alavi and C.A.M. Anderson. 2014. Change in serum carbon isotopes in response to change in sugar-sweetened beverage intake. Journal of Nutrition, 144(6): 902-905. (view/download pdf)

N.C. Arens, A.H. Jahren and D.C. Kendrick. 2014. Carbon isotope stratigraphy and correlation of plant megafossil localities in the Hell Creek Formation of eastern Montana, USA. Geological Society of America Special Papers, 503: 149-171. (view/download pdf)

N.C. Arens, A. Thompson and A.H. Jahren. 2014. A preliminary test of the press-pulse extinction hypothesis: Palynological indicators of vegetation change preceding the Cretaceous-Paleogene boundary, McCone County, Montana, USA. Geological Society of America Special Papers, 503: 209-227. (view/download pdf)


B.A. Schubert and A.H. Jahren. 2013. Reconciliation of marine and terrestrial carbon isotope excursions based on changing atmospheric CO2 levels. Nature Communications, 4:1653, DOI: 10.1038/ncomms2659. (view/download pdf)

A.H. Jahren, B.A. Schubert%, L. Marynowski and J.P. Wilson*. 2013. The carbon isotope organic geochemistry of Early Ordovician rocks from the Annascaul Formation, County Kerry. Irish Journal of Earth Sciences, 31: 1-12; doi: 10.3318/IJES.2013.31. (view/download pdf).


B.A. Schubert% and A.H. Jahren. 2012. The effect of atmospheric CO2 concentration on carbon isotope fractionation in C3 land plants. Geochimica et Cosmochimica Acta, 96: 29-43. (view/download pdf).

D.C. King*, B.A. Schubert% and A.H. Jahren. 2012. Practical considerations for the use of pollen δ13C value as a paleoclimate indicator. Rapid Communications in Mass Spectrometry, 26: 2165-2172, doi: 10.1002/rcm.6333. (view/download pdf).

B.A. Schubert%, A.H. Jahren, J.J. Eberle, L.S.L. Sternberg, and D.A. Eberth. 2012. A summertime rainy season in the Arctic forests of the Eocene. Geology, 40(6): 523–526, doi: 10.1130/G32856.1. (view/download pdf).

I. Yakovlev, C. G. Fossdal, T. Skrøppa, J. E. Olsen, A.H. Jahren, and Ø. Johnsen, 2012. An adaptive epigenetic memory in conifers with important implications for seed production. Seed Science Research, 14 pages, doi:10.1017/S0960258511000535. (view/download pdf).

A. Cuenca, G. Petersen, O. Seberg, and A.H. Jahren. 2012. Genes and processed paralogs co-exist in plant mitochondria. Journal of Molecular Evolution, 74: 158-169, doi:10.1007/s00239-012-9496-1 (view/download pdf).

W.M. Hagopian%, and A.H. Jahren. 2012. Elimination of nitrogen interference during online oxygen isotope analysis of nitrogen-doped organics using the “NiCat” nickel reduction system. Rapid Communications in Mass Spectrometry, 26: 1776-1782 (view/download pdf).


B.A. Schubert%, A.H. Jahren. 2011. Quantifying seasonal precipitation using high-resolution carbon isotope analyses in evergreen wood. Geochimica et Cosmochimica Acta, 75(22): 7291-7303. (view/download pdf)

B.M. Davy, A.H. Jahren, V.E. Hendrick*, D.L. Comber*. 2011. Association of δ13C in fingerstick blood with added-sugar and sugar-sweetened beverage Intake. Journal of the American Dietetic Association, 111(6) 874-878. (view/download pdf)

L. Marynowski, M. Rakocinski, E. Borcuch, B. Kremer, B.A. Schubert%, A.H. Jahren. 2011. Molecular and petrographic indicators of redox conditions and bacterial communities after the F/F mass extinction (Kowala, Holy Cross Mountains, Poland). Palaeogeography Palaeoclimatology Palaeoecology, 306, 1-14. (view/download pdf)

R.J. Panetta#, A.H. Jahren. 2011. Single-step transesterification with simultaneous concentration and stable isotope analysis of fatty acid methyl esters by gas chromatography-combustion-isotope ratio mass spectrometry. Rapid Communications in Mass Spectrometry, 25(10) 1372-1381. (view/download pdf)

B.A. Schubert% and A.H. Jahren. 2011. Fertilization trajectory of the root crop Raphanus sativus across atmospheric pCO2 estimates of the next 300 years. Agriculture, Ecosystems, and Environment, 140(1-2) 174-181, doi: 10.1016/j.agee.2010.11.024. (view/download pdf)


G.B. Hunsinger#, W.M. Hagopian%, A.H. Jahren. 2010. Offline Oxygen Isotope Analysis of Organic Compounds with High N:O, Rapid Communications in Mass Spectrometry, 24, 3182-3186. (view/download pdf)

E.H. Yeung#, C.D. Saudek, A.H. Jahren, W.M.L. Kao, M. Islas*, R. Kraft*, J. Coresh, and C.A. Anderson. 2010. Evaluation of a novel isotope biomarker for dietary consuption of sweets. American Journal of Epidemiology, doi: 10.1093/aje/kwq247. (view/download pdf)

W.M. Hagopian, and A.H. Jahren. 2010. Minimization of Sample Requirements for δ18O in Benzoic Acid, Rapid Communications in Mass Spectrometry, 24, 2542-2546; doi 10.1002/rcm.4669. (view/download pdf)

A.H. Jahren and B.A. Schubert#. 2010. The corn content of French-fry oil from national chain vs. small business restaurants, Proceedings of the National Academy of Sciences USA, 107(5) 2099-2101. (view/download pdf)


A.H. Jahren and N.C. Arens. 2009. Prediction of atmospheric δ13CO2 using plant cuticle isolated from fluvial sediment: tests across a gradient in salt content. Palaios, 24 394-401. doi: 10.2110/palo.2008.p08-069r. (view/download pdf)

A.H. Jahren, M.C. Byrne*, H.V. Graham*, R.A. Summons and L.S.L. Sternberg. 2009. The environmental water of the Middle Eocene Arctic: Evidence from δD and δ18O within specific compounds. Palaeogeography, Palaeoclimatology, Palaeoecology, 271(1-2), 96-103. doi: 10.1016/j.palaeo.2008.09.016. (view/download pdf)


A.H. Jahren, R.A. Kraft*. 2008. Carbon and nitrogen stable isotopes in fastfood: Signatures of corn and confinement. Proceedings of the National Academy of Sciences, 105(46), 17855-17860. doi: 10.1073 pnas.0809870105.(view/download pdf)

R.A. Kraft*, A.H. Jahren and C.D. Saudek. 2008. Clinical-scale investigation of stable isotopes in human blood: δ13C and δ15N from 406 patients at the Johns Hopkins Medical Institutions. Rapid Communications in Mass Spectrometry, 22(22), 3683-369.(view/download pdf)

G.J. Retallack and A.H. Jahren. 2008. Methane release from igneous intrusion of coal during Late Permian extinction events. Journal of Geology, 116, 1-20.(view/download pdf)

A.H. Jahren and L.S.L. Sternberg. 2008. Annual patterns within tree rings of the Arctic middle Eocene (~45 Ma): Isotopic signatures of precipitation, relative humidity and deciduousness. Geology, 36(2), 99-102.(view/download pdf)

A.H. Jahren, N.C. Arens and S.A. Harbeson*. 2008 (Invited). Prediction of atmospheric δ13CO2 using fossil plant tissues. Reviews of Geophysics, 46/2006RG0002.(view/download pdf)


L.S.L. Sternberg, M.C. Pinzon, P.F. Vendramini, W.T. Anderson, A.H. Jahren and K. Beuning. 2007. Oxygen isotope ratios of cellulose derived phenylglucosazone: An improved paleoclimate indicator of environmental water and relative humidity. Geochimica et Cosmochimica Acta, 71, 2463-2473.(view/download pdf)

A.H. Jahren. 2007 (Invited). The Arctic forest of the middle Eocene. Annual Review of Earth and Planetary Sciences, 35, 509-540.(view/download pdf)

S.P. Werts* and A.H. Jahren. 2007. Estimation of temperatures beneath archaeological campfires using carbon stable isotope composition of soil organic matter. Journal of Archaeological Sciences, 34(6), 850-857. doi:10.1016/j.jas.2006.05.007 (view/download pdf)

H.C.W. Skinner and A.H. Jahren. 2007 (Revised, 2nd Edition). Biomineralization, in Schlesinger, W.H., ed., Biogeochemistry, Volume 8: Treatise on Geochemistry: Oxford, Elsevier-Pergamon, Chapter 4, Pages 1-69. (view/download pdf)

G.J. Retallack, T.L. Greaver# and A.H. Jahren. 2007. Return to Coalsack Bluff and the Permian-Triassic boundary in Antarctica. Global and Planetary Change, 55, 90-108.(view/download pdf)


A.H. Jahren, C. Saudek, E. Yeung*, W.H. Kao, R. Kraft* and B. Caballero. 2006. An isotopic method for quantifying sweeteners derived from corn and sugar cane. American Journal of Clinical Nutrition, 84, 1380-1384.(view/download pdf)

L.S.L. Sternberg, M.C. Pinzon, W.T. Anderson and A.H. Jahren. 2006. Variation in oxygen isotope fractionation during cellulose synthesis: molecular and biosynthetic effects. Plant, Cell and Environment, 29, 1881-1889.(view/download pdf)

A.H. Jahren, K. Kelm#, B. Wendland, G. Petersen and O. Seberg. 2006. The carbon stable isotope composition of DNA isolated from an incipient paleosol: Geology, 34(5), 381-384.(view/download pdf)

G.J. Retallack, C.A. Metzger*, T.L. Greaver#, A.H. Jahren, R.M.H. Smith and N.D. Sheldon. 2006. Middle-Late Permian mass extinction on land. GSA Bulletin, 118(11), 1398-1411.(view/download pdf)


A.H. Jahren, C.P. Conrad, N.C. Arens, G. Mora# and C. Lithgow-Bertelloni. 2005. A plate tectonic mechanism for methane hydrate release along subduction zones. Earth and Planetary Science Letters, 236, 691-704.(view/download pdf)

G.J. Retallack, A.H. Jahren, N.D. Sheldon*, R. Chakrabarti, C.A. Metzger and R.M.H. Smith. 2005. The Permian-Triassic boundary in Antarctica. Antarctic Science, 17(2), 241-258.(view/download pdf)


A.H. Jahren, G. Petersen and O. Seberg. 2004. Plant DNA: A new substrate for carbon stable isotope analysis and a potential paleoenvironmental indicator. Geology, 32(3), 241-244.(view/download pdf)

A.H. Jahren. 2004. The carbon stable isotope composition of pollen. Review of Palaeobotany and Palynology, 132(3-4), 291-313.(view/download pdf)

A.H. Jahren, B.A. LePage and S.P. Werts*. 2004. Methanogenesis in Eocene Arctic soils inferred from δ13C of tree fossil carbonates. Palaeogeography, Palaeoclimatology, Palaeoecology, 214, 347-358.(view/download pdf)

A.H. Jahren. 2004. Factors of soil formation: Biota, in Hillel, D., Rosenzweig, C., Powlson, D., Scow, K., Singer, M., and Sparks, D., eds., Encyclopedia of Soils in the Environment: New York, Academic Press, p. 507-512.


A.H. Jahren and L.S.L. Sternberg. 2003. Paleohumidity estimates for the Eocene arctic rainforest. Geology, 31(5), 463-466. (view/download pdf)

A.H. Jahren, S. Porter* and J. Kuglitsch. 2003. Lichen metabolism identified in Early Devonian terrestrial organisms. Geology, 31(2), 99-102.(view/download pdf)

G. Mora# and A.H. Jahren. 2003. Isotopic evidence for the role of plant development on transpiration in deciduous forests of the southern United States. Global Biogeochemical Cycles, 17(2), 2002GB001981. (view/download pdf)


A.H. Jahren. 2002. The biogeochemical consequences of the mid-Cretaceous superplume. Journal of Geodynamics, 34, 177-191. (view/download pdf)

A.H. Jahren and K.L. Sanford*. 2002. Groundwater is the ultimate source of the Salt Creek Pupfish Habitat, Death Valley, U.S.A., Journal of Arid Environments, 51(3), 401-411. (view/download pdf)

N.C. Arens and A.H. Jahren. 2002. Chemostratigraphic correlation of four fossil-bearing sections in southwestern North Dakota. in Hartman, J.H., Johnson, K.R., and Nichols, D.J. eds., The Hell Creek Formation and the Cretaceous-Tertiary boundary in the northern Great Plains: An integrated record of the end of the Cretaceous: Boulder, Colorado, Geological Society of America Special Paper, 361, 75-93. (view/download pdf)

A.H. Jahren and L.S.L. Sternberg. 2002. Eocene meridional weather patterns reflected in the oxygen isotopes of Arctic fossil wood. GSA Today, 12(1), 4-9. (view/download pdf)


A.H. Jahren, R. Amundson, C. Kendall and P. Wigand. 2001. Paleoclimatic reconstruction using the correlation in δ18O of hackberry carbonate and environmental water, North America. Quaternary Research, 56(2), 252-263. (view/download pdf)

A.H. Jahren, N.C. Arens, G. Sarmiento, J. Guerrero and R. Amundson. 2001. Terrestrial record of methane hydrate dissociation in the Early Cretaceous. Geology, 29(2), 159-162. (view/download pdf)


N.C. Arens, A.H. Jahren and R. Amundson. 2000. Can C3 plants faithfully record the carbon isotopic composition of atmospheric carbon dioxide? Paleobiology, 26(1), 137-164. (view/download pdf)

N.C. Arens and A.H. Jahren. 2000. Carbon isotopic excursion in atmospheric CO2 at the Cretaceous-Tertiary boundary: Evidence from terrestrial sediments. Palaios, 15(4), 314-322. (view/download pdf)

C.A. Gadbury, L.C. Todd, A.H. Jahren and R. Amundson. 2000. Spatial and temporal variations in the isotopic composition of bison tooth enamel from the Early Holocene Hudson-Meng Bone Bed, Nebraska. Palaeogeography, Palaeoclimatology and Palaeoecology, 157, 79-93. (view/download pdf)


A.H. Jahren, M.L. Gabel and R. Amundson. 1998. Biomineralization in seeds: developmental trends in isotopic signatures of hackberry. Palaeogeography, Palaeoclimatology and Palaeoecology, 138:359-269. (view/download pdf)

A.H. Jahren, L.C. Todd, and R. Amundson. 1998. Stable isotope dietary analysis of bison bone samples from the Hudson-Meng bonebed: effects of paleotopography. Journal of Archaeological Science, 25, 465-475. (view/download pdf)

M. Coltorti, G. Ficcarelli, A.H. Jahren, M. Moreno-Espinosa, L. Rook and D. Torre. 1998. The last occurrence of Pleistocene megafauna in the Ecuadorian Andes. Journal of South American Earth Science, 11(6), 581-586.


R. Amundson, A.H. Jahren, R. Everett and J. Bartolome. 1997. Stable carbon isotope compositions of Poaceae pollen and its potential in paleovegetational reconstructions. Review of Paleobotany and Palynology, 99, 17-24. (view/download pdf)

Y. Wang, A.H. Jahren and R. Amundson. 1997. Biogenic carbonate in Hackberry (Celtis) endocarps: potential for 14C dating. Quaternary Research, 47, 337-343. (view/download pdf)

M.R. Cowan, M.L. Gabel, A.H. Jahren and L.L. Tieszen. 1997. Growth and biomineralization of Celtis occidentalis (Ulmaceae) pericarps. American Midland Naturalist, 137, 266-273. (view/download pdf)

A.H. Jahren, N. Toth, K. Shick, J.D. Clark, and R. Amundson. 1997. Distinguishing the nature of tool residue: chemical and morphological analysis of bamboo and bone tool residues. Journal of Archaeological Science, 24(3), 245-250. (view/download pdf)


A.H. Jahren, M.B. Kruger, and R. Jeanloz. 1992. Alexandrite as a high- temperature pressure calibrant, and implications for the ruby-fluorescence scale. Journal of Applied Physics, 71, 1579-1582. (view/download pdf)