Research Summary
Carbon, water and climate; biomarkers of ancient landscapes; fire markers; habitats of early humans; microbial biogeochemistry and biosignatures; oil, microbes and sediments in the Gulf of Mexico; and Pico-CSIA and early life of Earth.
In the News
Research Keywords
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Projects
Recent Publications
Sequential measurement of 13C, 15N, and 34S isotopic composition on nanomolar quantities of carbon, nitrogen, and sulfur using nano-elemental analysis/isotope ratio mass spectrometry
Baczynski, A. A., Brodie, C. R., Kracht, O. & Freeman, K. H., Mar 15 2023, In: Rapid Communications in Mass Spectrometry. 37, 5, e9444.Research output: Contribution to journal ⺠Article ⺠peer-review
Early Cretaceous marine incursions into South Atlantic rift basins originated from the south
Cui, X., Wignall, B., Freeman, K. H. & Summons, R. E., Dec 2023, In: Communications Earth and Environment. 4, 1, 6.Research output: Contribution to journal ⺠Article ⺠peer-review
Preferential Retention and Transport of Perfluorooctanesulfonic Acid in a Dolomite Aquifer
Jahn, K. L., Lincoln, S. A., Freeman, K. H. & Saffer, D. M., May 1 2023, In: Groundwater. 61, 3, p. 318-329 12 p.Research output: Contribution to journal ⺠Article ⺠peer-review
Local differences in paleohydrology have stronger influence on plant biomarkers than regional climate change across two Paleogene Laramide Basins, Wyoming, USA
Azevedo-Schmidt, L., Diefendorf, A. F., Schlanser, K., Baczynski, A. A., Dechesne, M., Dunn, R., Freeman, K. H. & Currano, E. D., Jun 15 2022, In: Palaeogeography, Palaeoclimatology, Palaeoecology. 596, 110977.Research output: Contribution to journal ⺠Article ⺠peer-review
Alkenones in Pleistocene Upper Bed I (1.803â1.900 Ma) sediments from Paleolake Olduvai, Tanzania
Brassell, S. C., Colcord, D. E., Shilling, A. M., Stanistreet, I. G., Stollhofen, H., Toth, N., Schick, K. D., Njau, J. K. & Freeman, K. H., Aug 2022, In: Organic Geochemistry. 170, 104437.Research output: Contribution to journal ⺠Article ⺠peer-review
Recommendation on Orbiting Sample Cleanliness
Cockell, C. S., Chitale, R., Clement, B., Davila, A., Freeman, K. H., French, K. L., Glavin, D. P., Hays, L. E., Hummel, K., Meyer, M. A., Pratt, L. M., Salvo, C., Seasly, E. & Tsang, K. W., Jun 1 2022, In: Astrobiology. 22, S1, p. S238-S241Research output: Contribution to journal ⺠Article ⺠peer-review
Introduction
Freeman, K. H. & Jeanloz, R., May 31 2022, In: Annual Review of Earth and Planetary Sciences. 50, p. V-VIIResearch output: Contribution to journal ⺠Editorial ⺠peer-review
Synchronous Marine and Terrestrial Carbon Cycle Perturbation in the High Arctic During the PETM
Cui, Y., Diefendorf, A. F., Kump, L. R., Jiang, S. & Freeman, K. H., Apr 2021, In: Paleoceanography and Paleoclimatology. 36, 4, e2020PA003942.Research output: Contribution to journal ⺠Article ⺠peer-review
Decreased soil carbon in a warming world: Degraded pyrogenic carbon during the Paleocene-Eocene Thermal Maximum, Bighorn Basin, Wyoming
Denis, E. H., Maibauer, B. J., Bowen, G. J., Jardine, P. E., Harrington, G. J., Baczynski, A. A., McInerney, F. A., Collinson, M. E., Belcher, C. M., Wing, S. L. & Freeman, K. H., Jul 15 2021, In: Earth and Planetary Science Letters. 566, 116970.Research output: Contribution to journal ⺠Article ⺠peer-review
Soil carbon degradation during the Paleocene-Eocene Thermal Maximum in the Piceance Basin, USA
Denis, E. H., Foreman, B. Z. & Freeman, K. H., Feb 15 2021, In: Palaeogeography, Palaeoclimatology, Palaeoecology. 564, 110182.Research output: Contribution to journal ⺠Article ⺠peer-review
Biased preservation of Pleistocene climate variability proxies at Olduvai Gorge, Tanzania
Ferland, T. M., Colcord, D. E., Shilling, A. M., Brassell, S. C., Stanistreet, I. G., Stollhofen, H., Njau, J. K., Schick, K. D., Toth, N. & Freeman, K. H., Jan 15 2021, In: Palaeogeography, Palaeoclimatology, Palaeoecology. 562, 109940.Research output: Contribution to journal ⺠Article ⺠peer-review
Position-specific isotope fractionation in amino acids sorbed to ice: Implications for the preservation of isotopologue biosignatures
Fox, A. C., Martineau, E., Remaud, G. S. & Freeman, K. H., Sep 15 2021, In: Geochimica et Cosmochimica Acta. 309, p. 45-56 12 p.Research output: Contribution to journal ⺠Article ⺠peer-review
Mission statement
Freeman, K. H. & Jeanloz, R., May 30 2021, In: Annual Review of Earth and Planetary Sciences. 49, p. v-viiiResearch output: Contribution to journal ⺠Editorial ⺠peer-review
Late Miocene C4 Grassland Fire Feedbacks on the Indian Subcontinent
Karp, A. T., Uno, K. T., Polissar, P. J. & Freeman, K. H., Apr 2021, In: Paleoceanography and Paleoclimatology. 36, 4, e2020PA004106.Research output: Contribution to journal ⺠Article ⺠peer-review
Soil Carbon Loss and Weak Fire Feedbacks During Pliocene C4 Grassland Expansion in Australia
Karp, A. T., Andrae, J. W., McInerney, F. A., Polissar, P. J. & Freeman, K. H., Jan 28 2021, In: Geophysical Research Letters. 48, 2, e2020GL090964.Research output: Contribution to journal ⺠Letter ⺠peer-review