Ph.D., 2014, Stanford University
Hari is a stable isotope geochemist. He studies the interactions between different components of the Earth system, from plate tectonics to the climate and biosphere. His interest in the earth sciences initially stemmed from a fascination with the beauty, balance and magnitude of earth processes, particularly in mountain landscapes. Unsurprisingly, the questions that have motivated his research operate on large scales–from the regional to continental scale spatially, and over geological timescales spanning millions of years.
His recent research has centered on the evolution of climate in western North America and Central Asia over the past 65 million years. Using the isotopes of oxygen and hydrogen in sediments, he produces and interprets geochemical records to answer questions such as: 1) How and when did the mountains of western North America rise, and how did their uplift affect atmospheric circulation? 2) How do changes in plant communities affect climate and water vapor recycling to the atmosphere? And 3) What were continental climates like during high-CO2 times in the past? Some of his current projects include studies of the topographic and climatic histories of the Sierra Nevada and the Alaska Range, and examining modern atmospheric rivers delivering moisture to the western North America. He has developed a modern water isotope facility at Santa Clara to investigate the modern hydrologic cycle.
Mix, H.T., Ibarra, D.E., Mulch, A., Graham, S.A., and Chamberlain, C.P. (2015). A hot and high Eocene Sierra Nevada. Geological Society of America Bulletin.
Mix, H.T. and Chamberlain, C.P. (2014). Stable isotope records of hydrologic change and paleotemperature from smectite in Cenozoic western North America. Geochimica et Cosmochimica Acta, v. 141, p. 532-546.
Chamberlain, C.P., Winnick, M., Mix, H.T., Chamberlain, S.D., Maher, K. (2014). The role of Neogene grassland expansion and aridification on the isotopic composition of continental precipitation. Global Biogeochemical Cycles, v. 28, p. 992-1004.
Caves, J.K., Sjostrom, D., Mix, H.T., Winnick, M., Chamberlain, C.P. (2014). Stable isotope constraints on aridity in northern Central Asia and implications for the uplift history of the Altai and Hangay. American Journal of Science, v. 314, p. 1171-1201.
Mix, H.T., Winnick, M.J., Mulch, A., Chamberlain, C.P. (2013). Grassland expansion as an instrument of hydrologic change in Neogene western North America. Earth and Planetary Science Letters, v. 377-378, p. 73-83.
Feng, R., Poulsen, C.J., Werner, M., Chamberlain, C.P., Mix, H.T., Mulch, A. (2013). Early Cenozoic evolution of topography, climate, and stable isotopes in precipitation in the North American Cordillera. American Journal of Science, v. 313, p. 613-648.
Chamberlain, C.P., Mix, H.T., Mulch, A., Hren, M.T., Kent-Corson, M.L., Davis, S.J., Horton, T.W., Graham, S.A. (2012).The Cenozoic Climatic and Topographic Evolution of the Western North American Cordillera. American Journal of Science, v. 312, p. 213-262.
Mix, H.T., Mulch, A., Kent-Corson, M.L., Chamberlain, C.P. (2011). Cenozoic migration of topography in the North American Cordillera. Geology, v. 39, p. 87-90.
Davis, S.J., Mix, H.T., Wiegand, B.A., Carroll, A.R. and Chamberlain, C.P. (2009).
Synorogenic evolution of large-scale drainage patterns: Isotope paleohydrology of sequential Laramide basins. American Journal of Science, v. 309, p. 549-602.