Paleoclimatology, Stable Isotope Geochemistry
Telephone: (702) 895-4388
Fax: (702) 895-4064
Office: SEB 3240
Ph.D. – Syracuse University: 2001
Dr. Lachniet has an active research program in which he uses light stable and radiogenic isotope geochemistry, hydrology, speleology, glacial geology, geomorphology, and the sedimentary record to answer questions of paleoenvironmental and paleoclimatic change. His primary research areas are Costa Rica, Panama, Mexico, Alaska, and the Great Basin.
His research goal is to constrain past climate changes in these regions using proxy records. He is particularly interested in generating rainfall histories for Central America and to evaluate the climate forcings of climate change and variability in the neotropics. What processes control tropical and subtropical paleoclimates? Do the tropics have a stable or unstable climate? As the ‘heat engine’ of the earth, do the tropics drive climate change in higher latitudes? Or do the tropics respond passively to extratropical climate perturbations? How has the El Nino/Southern Oscillation changed over time? What will be the tropical response to anthropogenic climate change? These are some of the questions he is attempting to answer with his research.
His research attempts to resolve this problem through generation of high-resolution (sub-annual to decadal), precisely dated, quantitative isotopic proxy records from speleothems (cave calcite deposits). Speleothem isotopic records will help to resolve continuing debates about tropical-extratropical teleconnections on both a regional and a global scale, and provide insight into the history and dynamics of monsoonal precipitation. Together with studies on modern stable isotope climatology and hydrology, and traditional geologic investigations such as tropical glaciation, his research is making substantial progress in elucidating neotropical Quaternary paleoclimates.
Lachniet, M. S., Asmerom, Y., Polyak, V., and Bernal, J. P., 2017, Two millennia of Mesoamerican monsoon variability driven by Pacific and Atlantic synergistic forcing: Quaternary Science Reviews, v. 155, p. 100-113.
Lachniet, M.S., 2016. Great Basin Paleoclimate from the Leviathan Chronology, Nevada, in: Oviatt, C.G., Shroder, J.F. (Eds.), Lake Bonneville: A scientific update. Elsevier, pp. 551-569.
Lachniet, M.S., Lawson, D. E., Stephen, H., Sloat, A. R., and Patterson, W. P., 2016, Isoscapes of δ18O and δ2H reveal climatic forcings on Alaska and Yukon precipitation: Water Resources Research.
Lachniet, M.S., 2015. Are aragonite stalagmites reliable paleoclimate proxies? Tests for oxygen isotopic time series replication and equilibrium. Geological Society of America Bulletin 127, 1521-1533.
Lachniet, M. S., Denniston, R. F., Asmerom, Y., and Polyak, V. J., 2014, Orbital control of western North America atmospheric circulation and climate over two glacial cycles: Nature Communications. 10.1038/ncomms4805