Research in the Ehleringer Lab is directed at answering four ecological questions of societal relevance. First, how does drought influence carbon cycles in ecosystems of the western US? Second, how do humans and our choices influence carbon and water cycles in urban ecosystems? Third, how can stable isotopes analyses inform us about process related to human activities, our movements, and dietary choices? Fourth, how can we reconstruct climate history and broad precipitation patterns using biomarker proxies?

In the News

Global warming in the late holocene Postdoc Logan Mitchell has a paper in Science providing evidence of the human contribution to increased atmospheric methane concentration. Read more
AISES REPRESENTATIVE Jeffrey Ross, a PhD student in the lab, has been elected as the Junior National Student Representative to the American Indian Science and Engineering Society (AISES). In this position he will serve as the student representative to the AISES Board of Directors for a period of two-years. Jeffrey is a member of the Northwest Angle #33 First Nation in Ontario, Canada. His thesis research is investigating restoration processes and competition associated with Russian knapweed along riparian corridors of southern Utah deserts.
Chakraborty NEW LAB MANAGER We are pleased to welcome Dr. Suvankar Chakraborty as manager of SIRFER, the Stable Isotope Ratio Facility for Environmental Research. Suvankar comes to us from the University of Kentucky, where he was the Research Facility Manager in the stable isotope laboratory in the Department of Earth and Environmental Sciences.
URBAN RED BUTTE MAP Will McDonald has recently completed a 40-cm resolution map of the vegetation of the urban portions of the Red Butte Creek watershed. This map will now allow iUTAH researchers and land managers the capacity to evaluate transpiration, water runoff, and ecological dynamics in the very urbanized watershed. Click here for a high resolution map and poster.
MELISSA BERKE accepted a new faculty position at Notre Dame. In August postdoctoral investigator Mellisa Berke departed the Ehleringer Lab to become the new faculty member in Geology on the Notre Dame campus in South Bend. Look for her latest research results soon on n-alkane isotope variation along the North American monsoon gradient.
ISOCAMP 2013 is now finished! The 18th annual Stable Isotope Biogeochemistry and Ecology course in June was a resounding sucess. 37 graduate students and postdocs from around the world attended this year's lecture and lab classes. Another 6 students from Utah participated in the lectures. 16 instructors from across the USA provided stimulating lectures and inspired students.
The NERDMOBILE is coming to your neighborhood. Our mobile laboratory provide high precision, instantaneous measurements of CO, CO2, CH4, NOX, O3, and particulate matter. Click here to learn more and to see some of the transect data sets.

LEAF WAXES record early season hydrology. In Brett Tipple’s latest paper in PNAS, he describes results of a series of experiments that are making paleoclimatologist reconsider how they interpret n-alkane isotope data (derived from leaf waxes). Click here to learn more.

DEPRAVED In March 2013 we completed the 33rd annual DEPRAVED census of Encelia and Hymenoclea populations in Death Valley, California and Oatman, Arizona. Continuing our collaboration with Darren Sandquist’s Lab at CSU Fullerton, we spent a week monitoring the same four populations that we have followed since 1980. Thanks to all who have contributed to this field work over the years.
SIE News Measuring co2 to fight global warming. Jiim Ehleringer and colleagues have developed a method which could reliably detect changes in CO2 of 15% or more. Potential climate treaties would necessarily rely on the ability to verify CO2 emissions. Ehleringer did the study with four Massachusetts atmospheric scientists: Kathryn McKain and Steven Wofsy of Harvard University, and Thomas Nehrkorn and Janusz Eluszkiewicz of Atmospheric and Environmental Research, Inc.
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