David Valentine

Distinguished Professor

Contact Phone


Office Location

Webb 2017a


Geochemistry, Microbiology, Marine Science


Professor Valentine studies the interaction among microbes and between microbes and the Earth system.  He uses tools of isotope geochemistry and molecular microbiology to probe fundamental questions at the interface of biology, chemistry and earth science.


Citation Summary:  Google Scholar




Valentine RC and DL Valentine (in press) Neurons and the DHA Principle.  pp239. CRC Press – Taylor and Francis.

Aeppli C, CA Carmichael, RK Nelson, KL Lemkau, WM Graham, MC Redmond, DL Valentine, and CM Reddy (2012) Oil weathering after the Deepwater Horizon spill led to the formation of oxygenated residues. Environmental Science and Technology 46, 8799-8807.

Heintz M, S Mau and DL Valentine (2012) Oceanographic Control on Methanotrophic Potential in the Satna Monica Basin, Southern CA Borderland.  Limnology and Oceanography. Limnology and Oceanography 57(2) 420-432. doi:10.4319/lo.2012.57.2.0420.

Ryerson T, R Camilli , J Kessler, E Kujawinski, C Reddy, D Valentine, E Atlas, D Blake, J de Gouw, S Meinardi, D Parrish, J Peischl, J Seewald, C Warneke (2012) Chemical composition measurements quantify Deepwater Horizon hydrocarbon emissions and distribution in the marine environment.  Proceedings of the National Academy of Sciences doi/10.1073/pnas.1110564109.

Valentine DL, I Mezi?, S.  Ma?eši?, N. ?rnjari?-Žic, S.   Ivi?, P Hogan, V Fonoberov and S Loire (2012) Dynamic auto-inoculation and the microbial ecology of a deep water hydrocarbon irruption. Proceedings of the National Academy of Sciences doi/10.1073/pnas.1108820109.

Mau S, MB Heintz and DL Valentine  (2012) Quantification of CH4 loss and transport in dissolved plumes of the Santa Barbara Channel, California. Continental Shelf Research 32, 110-120.


Redmond MC and DL Valentine (2011) Natural gas and temperature structured a microbial community response to the Deepwater Horizon oil spill.  Proceedings of the National Academy of Sciences doi/10.1073/pnas.1108756108.

Kessler* JD, DL Valentine, MC Redmond and C Du (2011) Response to Technical Comment on Kessler et al “A Persistent Oxygen Anomaly Reveals the Fate of Spilled Methane in the Deep Gulf of Mexico”  Science, 332, 1033-d.

Wardlaw, G.D.  CM Reddy, RK Nelson and DL Valentine  (2011) Biodegradation preference for isomers of alkylated naphthalenes and benzothiophenes in marine sediment contaminated with crude oil.  Organic Geochemistry 42, 630-639.

Pack MA, MB Heintz, WS Reeburgh, SE Trumbore, DL Valentine, X Xu and ERM Druffel.  (2011) A method for measuring methane oxidation rates using low-levels of 14C-labeled methane and accelerator mass spectrometry.  Limnology and Oceanography: Methods, 9: 245-260.

Quistad SD and DL Valentine (2011) Anaerobic propane oxidation in marine hydrocarbon seep sediments.  Geochimica et Cosmochimica Acta 75, 2159-2169.

Kujawinski EB, MC Kido Soule, DL Valentine, AK Boysen, K Longnecker, and MC Redmond, (2011) Fate of Dispersants Associated with the Deepwater Horizon Oil Spill.  Environmental Science and Technololgy,45 (4), 1298–1306.

*Kessler JD, DL *Valentine, MC Redmond, M Du, EW Chan, SD Mendes, EW Quiroz, CJ Villanueva, SS Shusta,LM. Werra, SA Yvon-Lewis, TC Weber (2011) A Persistent Oxygen Anomaly Reveals the Fate of Spilled Methane in the Deep Gulf of Mexico.  Science (331) 312-315.

Valentine, DL Emerging Topics in Marine Methane Biogeochemistry (2011) Annual Review of Marine Science 3, 147-171.

Li C, AL Sessions, DL Valentine and N. Thiagarajan (2011) D/H variations of terrestrial lipids from Santa Barbara Basin over the past 1400 years: A preliminary assessment of paleoclimatic relevance.
Organic Geochemistry (42) 15-24.


Swan BK, CM Ehrhardt, KM Reifel,LI Moreno, and DL Valentine Archaeal and Bacterial Communities Respond Differently to Environmental Gradients in Anoxic Sediments of a California Hypersaline Lake, the Salton Sea (2010).  Applied and Environmental Microbiology. 76 (3) 757-768.

Kinnaman, F, J Kimball, L Busso, D Birgel, H Ding, K Hinrichs, and D. Valentine (2010) Gas flux and carbonate occurrence at a shallow seep of thermogenic natural gas.  Geo-Marine Letters 30: 355-65

Mau S, MB Heintz, FS Kinnaman, DL Valentine (2011) Compositional variability and air-sea flux of ethane and propane in the plume of a large, marine seep field near Coal Oil Point, CA.  Geo-Marine Letters 30: 367-78

Valentine DL, CM Reddy, C Farwell, TM Hill, O Pizarro, DR Yoerger, R Camilli, RK Nelson, EE Peacock, SC Bagby, BA Clarke, CN Roman and M Soloway (2010) Asphalt volcanoes as a potential source of methane to late Pleistocene coastal waters.  Nature Geoscience 3: 345-348.doi:10.1038/ngeo848

Swan BK, KM Reifel and DL Valentine (2010) Periodic sulfide irruptions impact microbial community structure and diversity in the water column of a hypersaline lake.  Aquatic Microbial Ecology

Valentine, DL.  Measure methane to quantify the oil spill (2010).  Nature, V 465 p 421

Redmond, MC, DL Valentine and AL Sessions Novel Methane, Ethane, and Propane Oxidizing Bacteria at Marine Hydrocarbon Seeps Identified by Stable Isotope Probing (2010).  Applied and Environmental Microbiology 76(19) 6412-6422.

Valentine DL, JD Kessler, MC Redmond, SD Mendes, MB Heintz, C Farwell, L Hu, FS Kinnaman, S Yvon-Lewis, Mengran Du, EW Chan, F Garcia-Tigreros, CJ VillanuevaPropane respiration jump starts microbial response to a deep oil spill, (2010).  Science, 330, 208 (2010); DOI: 10.1126/science.1196830


Earth 4:        Introduction to Oceanography

Earth 164B:  Earth System Oceans-Atmospheres

Earth 182A:  Field Studies in Marine Biogeochemistry

Earth 270:    Special Topics in Microbiology