Our group has been involved in numerous projects that have spanned the great state of Alaska.  We have investigated [1] methane fluxes potentially associated with subsea permafrost and methane hydrates near Prudhoe Bay, [2] methane emissions from thermokarst lakes, [3] methane production and oxidation in Skan Bay (Aleutian Island of Unalaska), and [4] groundwater methane discharge in the Kachemak Bay.  The diversity of Alaska allows a seemingly endless number of studies surrounding methane and carbon dioxide dynamics.

SELECT PUBLICATIONS

• Sparrow, K. J., J. D. Kessler, J. R. Southon, F. Garcia-Tigreros, K. M. Schreiner, C. D. Ruppel, J. B. Miller, S. J. Lehman, X. Xu, Limited contribution of ancient methane to surface waters of the U.S. Beaufort Sea shelf. Science Advances 4, eaao4842 (2018).
• Garcia-Tigreros Kodovska, F., K.J. Sparrow, S.A. Yvon-Lewis, A. Paytan, N.T. Dimova, A. Lecher, J.D. Kessler. (2016) “Dissolved methane and carbon dioxide fluxes in Subarctic and Arctic regions: Assessing measurement techniques and spatial gradients.” Earth and Planetary Science Letters, doi: 10.1016/j.epsl.2015.12.002.
• Dimova, N.T., A. Paytan, J.D. Kessler, K.J. Sparrow, F. Garcia-Tigreros Kodovska, A.L. Lecher, J. Murray, and S.M. Tulaczyk. (2015) "Current Magnitude and Mechanisms of Groundwater Discharge in the Arctic: Case Study from Alaska." Environmental Science & Technology, doi: 10.1021/acs.est.5b02215.
• Lecher, A.L., J.D. Kessler, K. Sparrow, F. Garcia-Tigreros Kodovska, N. Dimova, J. Murray, S. Tulaczyk, A. Paytan. (2015) “Methane transport through submarine groundwater discharge to the North Pacific and Arctic Ocean at two Alaskan sites.” Limnology and Oceanography, doi: 10.1002/lno.10118.
• Paytan, A., A. Lecher, N. Dimova, K. Sparrow, F. Garcia-Tigreros Kodovska, J.D. Kessler. (2015) “Methane transport from the active layer to lakes in the Arctic using Toolik Lake, Alaska, as a case study.” Proceedings of the National Academy of Sciences, doi:10.1073/pnas.1417392112.
• Kessler, J.D., W.S. Reeburgh, D.L. Valentine, F.S. Kinnaman, E.T. Peltzer, P.G. Brewer, J. Southon, and S.C. Tyler (2008).  “A survey of methane isotope abundance (14C, 13C, 2H) from five nearshore marine basins that reveals unusual radiocarbon levels in subsurface waters.”  Journal of Geophysical Research, 113, C12021, doi:10.1029/2008JC004822.

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