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.
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Research Keywords
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Projects
Recent Publications
Thresholds of Temperature and Time for Mars Sample Return: Final Report of the Mars Sample Return Temperature-Time Tiger Team
Sephton, M. A., Freeman, K., Hays, L., Thiessen, F., Benison, K., Carrier, B., Dworkin, J. P., Glamoclija, M., Gough, R., Onofri, S., Peterson, R., Quinn, R., Russell, S., Stüeken, E. E., Velbel, M. & Zolotov, M., May 17 2024, In: Astrobiology. 24, 5, p. 443-488 46 p.Research output: Contribution to journal › Article › peer-review
Position-Specific 2H/H Equilibrium Isotopic Fractionation Factors in Alkane, Alkene, and Aromatic Molecules: A Density Functional Theory Approach
Watts, H. D., Kubicki, J. D., Pedentchouk, N. & Freeman, K. H., Jan 18 2024, In: ACS Earth and Space Chemistry. 8, 1, p. 21-35 15 p.Research output: Contribution to journal › Article › peer-review
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 › Article › 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 › Article › peer-review
Introduction
Freeman, K. H. & Jeanloz, R., May 31 2023, In: Annual Review of Earth and Planetary Sciences. 51, p. V-VIIIResearch output: Contribution to journal › Editorial › peer-review
Impact of organic carbon reworking upon GDGT temperature proxies during the Paleocene-Eocene Thermal Maximum
Inglis, G. N., Martínez-Sosa, P., Tierney, J. E., Witkowski, C. R., Lyons, S., Baczynski, A. A. & Freeman, K. H., Sep 2023, In: Organic Geochemistry. 183, 104644.Research output: Contribution to journal › Article › 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 › Article › peer-review
Storage, Transport, and Fate of Perfluoroalkyl Acids (PFAAs) in a Wastewater Reuse and Groundwater Recharge System
Jahn, K. L., Saffer, D. M., Freeman, K. H. & Lincoln, S. A., Sep 2023, In: Water Resources Research. 59, 9, e2022WR034321.Research output: Contribution to journal › Article › peer-review
Compound-specific carbon isotope measurements of individual lipid biomarkers from immature Ediacaran rocks of Baltica
Pehr, K., Baczynski, A. A., Bekker, A., Hoffmann, A., Freeman, K. H., Poulton, S. W. & Love, G. D., Aug 2023, In: Organic Geochemistry. 182, 104641.Research output: Contribution to journal › Article › peer-review
Analysis of intramolecular carbon isotope distributions in alanine by electrospray ionization Orbitrap mass spectrometry
Weiss, G. M., Sessions, A. L., Julien, M., Csernica, T., Yamada, K., Gilbert, A., Freeman, K. H. & Eiler, J. M., Nov 2023, In: International Journal of Mass Spectrometry. 493, 117128.Research output: Contribution to journal › Article › peer-review
Polycyclic aromatic hydrocarbons in samples of Ryugu formed in the interstellar medium
Zeichner, S. S., Aponte, J. C., Bhattacharjee, S., Dong, G., Hofmann, A. E., Dworkin, J. P., Glavin, D. P., Elsila, J. E., Graham, H. V., Naraoka, H., Takano, Y., Tachibana, S., Karp, A. T., Grice, K., Holman, A. I., Freeman, K. H., Yurimoto, H., Nakamura, T., Noguchi, T. & Okazaki, R. & 57 others, , Dec 1 2023, In: Science. 382, 6677, p. 1411-1416 6 p.Research output: Contribution to journal › Article › 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 › Article › peer-review
Alkenones in Pleistocene Upper Bed I (1.803–1.900 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 › Article › 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 › Article › 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 › Editorial › peer-review