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Faculty Profiles

Trefry, John

Professor, Ocean Engineering and Marine Sciences

Personal Overview

• Associate Editor of the Elsevier journal Marine Chemistry (2004-).

• Member of U.S. Department of Interior Outer Continental Shelf Scientific Committee (2003- ).

• President of the Florida Academy of Sciences (2005-2007).

Educational Background

Ph.D. Texas A&M University
A.B. Syracuse University

Professional Experience

Member of the first scientific team to photograph and sample active hydrothermal vents on the Mid-Atlantic Ridge in 1985. Research has identified the importance of high-temperature venting (200-350 degrees C) on the cycling of trace metals through the oceans and in creating metal-rich deposits on the seafloor.

Involved in various national and international panel and workshop activities in areas such as the development of U.S. Marine pollution programs and offshore oil activities from U.S. to Sakhalin Island, Russia.

Participated in >40 Oceanographic cruises including trips aboard R/Vs OCEANOGRAPHER, DISCOVERER, GYRE, KNORR, RESEARCHER, ATLANTIS (and AII)/ALVIN, SURVEYOR with more that 600 days at sea. Chief Scientist on 12 occasions.

Teaches courses in marine and environmental chemistry, geochemistry and instrumental analysis.

Current Research

Current research projects include:

• ANIMIDA III Program: Study of potential impacts of offshore oil operations in the Alaskan Arctic (2013-2016). Research includes detailed study trace metals in bottom sediments and inputs of suspended sediment and trace metals from arctic rivers to the Beaufort Sea and their transport and fate in the marine environment.
(U.S. Department of the Interior, Bureau of Ocean Energy Managment)



•Chukchi Sea Offshore Monitoring in the Drilling Area (COMIDA), U.S. Department of Interior, Bureau or Ocean Energy Management, Regulation and Enforcement, 2009-2012.Chukchi Sea Offshore Monitoring in the Drilling Area (COMIDA), U.S. Department of Interior, Bureau or Ocean Energy Management, Regulation and Enforcement, 2009-2016. Study of trace metals, including arsenic, lead and mercury, in water, biota and sediments from the Chukchi Sea with recent emphasis on Hanna Shoal. Study is designed to identify sensitive areas for possible future oil exploration and to track impacts of global climate change in the sensitive arctic environment.




Selected Publications

Trefry, J.H., Trocine, R.P., Cooper, L.W., Dunton, K.H. (2014) Trace metals and organic carbon in sediments of the northeastern Chukchi Sea. Deep-Sea Research II, 102:18-31, doi: 10.1016/j.dsr2.2013.07.018.

Fox, A.L., Hughes, E.A., Trocine, R.P., Trefry, J.H., Schonberg, S.V., McTigue, N.D., Lasorsa, B.K., Cooper, L.W. (2014) Mercury in the northeastern Chukchi Sea: Distribution patterns in seawater and sediments and biomagnification in the benthic food web. Deep-Sea Research II, 102:56-67, doi:10.1016/j.dsr2.2013.07.012.

Dunton, K.H., Grebmeier, J.M., Trefry, J.H. (2014) The benthic ecosystem of the northeastern ChukchiSea: An overview  of its unique biogeochemical and biological characteristics. Deep-Sea research II, 102:1-8, doi: 10.1016/j.dsr2.2014.01.001.

Konar, B., Ravelo, A., Grebmeier, J, Trefry, J. (2014) Size frequency distributions of key epibenthic organisms in th eeastern Chukchi Sea and their correlations with environmental parameters. Deep-Sea Research II, 102:107-118, doi:10.1016/j.dsr2.2013.07.015.

Ravelo, A.M., Konar, B., Trefry, J.H., Grebmeier, J.M. (2014) Epibenthic community variability in the northeastern Chukchi Sea. Deep-Sea Research II, 102-119-131, doi:10.1016/j.dsr2.2013.07.017.

Trefry, J.H., Dunton, K.H., Trocine, R.P., Schonberg, S.V., McTigue, N.D., Hersh, E.S., McDonald, T.J. (2013) Chemical and biological assessment of two offshore drilling sites in the Alaskan Arctic. Marine Environmental Research 86:35-45.

Kang, W-J. and Trefry, J.H. (2013) Identifying increased inputs of terrestrial phosphorus to sediments of the southwestern Everglades and Florida Bay. Estuarine, Coastal and Shelf Science 129:28-36.

Naidu, A.S., Blanchard, A.L., Misra, D., Trefry, J.H., Dasher, D.H., Kelley, J.J., Venkatesan, M.I. (2012) Historical changes in trace metals and hydrocarbons in nearshore sediments, Alaskan Beaufort Sea, prior and subsequent to petroleum-related industrial development: Part I. Trace metals. Marine Pollution Bulletin 64:2177–2189.

Trefry, J.H. and Trocine, R.P. (2011) Metals in sediments and clams from the Indian River Lagoon, Florida: 2006-7 versus 1992. Florida Scientist 74:43-62.

Trefry, J.H. and Trocine, R.P. (2011) Chemical forms and reactions of barium in mixtures of produced water with seawater. In: Lee K, Neff J (eds) Produced water: environmental risks and advances in mitigation technologies, Ed. by Lee, K and Neff, J. Springer, New York, pp. 127-146.


Rember, R.D. and Trefry, J.H. (2004) Increased concentrations of dissolved trace metals and organic carbon   during snowmelt in rivers of the Alaskan Arctic. Geochimica et Cosmochimica Acta 68:477-489.

Kang, W.-J., Trefry, J.H., Nelsen, T.A. and Wanless, H.R. (2000) Direct Atmospheric Inputs versus Runoff Fluxes of Mercury to the Lower Everglades and Florida Bay. Enviromental Science and Technology 34: 4058-4063.

Metz, S. and Trefry, J.H. (2000) Chemical and mineralogical influences on concentrations of trace metals in hydrothermal fluids. Geochimica et Cosmochimica Acta, 64(13): 2267-2279.

Feely, R.A., Trefry, J.H., Lebon, G.T. and German, C.R. (1998) The relationship between P/Fe and V/Fe ratios in hydrothermal precipitates and dissolved phosphate in seawater. Geophysical Research Letters, 25(13): 2253-2256.

Trefry, J.H. and Metz, S. (1989) Role of Hydrothermal Precipitates in the Geochemical Cycling of Vanadium. Nature 342: 531-533.

Trefry, J.H., Metz, S., Trocine, R.P. and Nelsen, T.A.(1985) A Decline in Lead Transport by the Mississippi River. Science 230: 439-441.