Aradhna Tripati

Aradhna Tripati is an American geoscientist, climate scientist, and advocate for diversity. She is a professor at the University of California, Los Angeles (UCLA) where she is part of the Institute of the Environment and Sustainability, the Department of Earth, Planetary, and Space Sciences, the Department of Atmospheric and Oceanic Sciences, and the California Nanosystems Institute. She is also the director of the Center for Diverse Leadership in Science. Her research includes advancing new chemical tracers for the study of environmental processes and studying the history of climate change and Earth systems. She is recognized for her research on climate change and clumped isotope geochemistry. She studies the evolution of atmospheric carbon dioxide levels and the impacts on temperature, the water cycle, glaciers and ice sheets, and ocean acidity.

Aradhna Tripati
Alma materCalifornia State University, Los Angeles
University of California, Santa Cruz, PhD, 2002
AwardsPresidential Early Career Award for Scientists and Engineers
Scientific career
FieldsPaleoceanography, Climate Change, Geochemistry
InstitutionsUniversity of California, Los Angeles
Thesis (2002)
Doctoral advisorJames Zachos
WebsiteResearch site

Early life and education

Born in Texas, Tripati moved to California at age three with her parents, who had emigrated to the United States from the Fiji Islands.[1] She was raised largely by her mother, a nurse, whom she credits with giving her the support and access to opportunities that have since ensured her success. Tripati went to elementary school and junior high school in the Los Angeles Unified School District. At age 12 she enrolled at California State University, Los Angeles as a full-time student through their Early Entrance Program.[2]

Tripati holds a B.S. in geology from California State University, Los Angeles where she received several awards, including the Aaron Waters Award for outstanding senior in 1996.[3] She received her Ph.D. in Earth Sciences from the University of California, Santa Cruz in 2002 where she worked under the supervision of doctoral advisor James Zachos.

Tripati began her postdoctoral research at the University of Cambridge with a Marshall Sherfield Postdoctoral Fellowship. Over the next eight years as an independent researcher, Tripati received several fellowships: the Comer Abrupt Climate Change Fellowship, the Thomas Neville Research Fellowship in Natural Science at Magdalene College, and a UK National Environmental Research Council (NERC) Fellowship.

Career and Research
Aradhna Tripati and a group of community college students in one of her research laboratories.

In 2009, Tripati became an assistant professor at UCLA and was subsequently promoted to associate professor in 2014, where she continues to teach full-time. She has joint appointments in the Atmospheric & Oceanic Sciences and Earth, Planetary, & Space Sciences departments and the Institutes of Geophysics & Planetary Physics and Environment & Sustainability.

Since she was an undergraduate student, Tripati has been working on advancing and utilizing state-of-the-art geochemical methods to understand Earth's climate evolution. Over the course of her career, she has applied these methods to better understand the history and patterns of changes in Earth's temperature, carbon cycling, pH, ice volume, and hydrology.

Tripati's laboratory leverages clumped isotope geochemistry as a tool to reconstruct climate norms from the distant past in order to understand the dynamics of climate change over a range of timescales.[4] The primary geochemical method she works with is clumped isotope thermometry, which has led to advancements of its use in the field. She helped develop a technique known as a "paleothermometer," which allows scientists to measure past temperatures by analyzing the chemical ratios of specimens from different time periods.[5] The chemical composition of a particular specimen reflects the composition of the Earth's atmosphere at a given point in time, allowing scientists to understand what the atmosphere was like in the past. Using these techniques in a 2009 study, Tripati and her team were able to find that the last time carbon dioxide levels reached their current level was between 10 and 15 million years ago when the average global temperature was 10˚F warmer than it is today.[6] In a later study published in 2016, Tripati and her colleagues from around the world demonstrated that an ice sheet collapse that took place 14,000 years ago caused the Earth's entire jet stream to shift within a single century.[7][8] Their results were based on analysis of an ANDRILL-2 drill core that was extracted near the U.S. Antarctic base McMurdo Station. The study suggested that the Antarctic ice sheet may be sensitive to atmospheric carbon dioxide levels that are not far from where they currently reside.

Tripati has also applied her expertise in clumped isotope geochemistry towards determining the body temperatures of dinosaurs that have long been extinct. As a visiting professor at California Institute of Technology, she collaborated on a 2011 study that analyzed the composition of fossilized teeth of Jurassic sauropods to find that their internal body temperature was close to that of most modern mammals, resting somewhere between 36 and 38˚C.[9][10] Scientists had previously hypothesized that sauropod body temperature was warmer, but their study suggested that these dinosaurs stayed cool by using internal air sacs for ventilation. In a later 2015 study, she and her colleagues analyzed the chemical composition of ancient eggshells to estimate the maternal body temperature of a number of different dinosaurs.[11][12][13] Their results, combined with other studies, suggested that dinosaurs aren't simply cold-blooded or warm-blooded, but were somewhere in between.

In 2014, Tripati received a National Science Foundation CAREER Award to leverage clumped isotopes as a tool to reconstruct terrestrial climates during the Last Glacial Maximum, as well as to support her work recruiting and retaining a diverse research workforce.[14]

Diversity, equity, and inclusion

Tripati engages in activism to promote diversity, equity, and inclusion in the sciences and in the workforce, with a particular focus on addressing the underrepresentation of women, people of color, and other minorities in geoscience, environmental science, and other STEM fields. In July 2017, she launched the UCLA Center for Diverse Leadership in Science, which focuses on the intersection between race and environmental science.[1][15][16] The center aims to develop a cohort of community-minded scientists with expertise in climate, environmental science, green chemistry, and green engineering who will become leaders.

Tripati organized and wrote a grant proposal that funded a career development workshop for women and minorities at American Geophysical Union (AGU)[17] and served as faculty lead for a program aimed at increasing transfers from community colleges to UCLA. She is involved in the Minorities Striving and Pursuing Higher Education Degrees in Earth System Science group, was a Goldschmidt Geochemistry Society Mentor, is on the advisory board for 500 Women Scientists, and has established two peer mentoring groups on Facebook: Equity and Inclusion in Geoscience and Environmental Science, and the Society for Difficult Women.

Tripati engages youth in the sciences with K-12 outreach programs. She works with high school students and teachers on research projects and she implements an annual project in her UCLA general education oceanography class where students must create educational content for K-12 science teachers. She appeared in a sketch on Jimmy Kimmel that discussed the consensus on human-induced climate change arising from greenhouse gas emissions and in an interview on KCRW's Press Play with Madeleine Brand to answer questions about the realities of climate change.[18][19]

Awards and honors

Tripati has been awarded for her contributions to research, teaching, and service, including the Presidential Early Career Award in Science and Engineering, the highest honor bestowed by the United States Government on science and engineering professionals in the early stages of their research careers.[20]

Selected publications
  • Tripati, A. and Elderfield, H., 2005, Deep-Sea Temperature and Circulation Changes at the Paleocene-Eocene Thermal Maximum, Science, 308(5729), 1894–1898, doi:10.1126/science.1109202
  • Tripati, A., Backman, J., Elderfield, H., and Ferretti, P., 2005, Eocene bipolar glaciation associated with global carbon cycle changes, Nature, 436, 341–346, doi:10.1038/nature03874
  • Tripati, A., Roberts, C.*, Eagle, R., 2009, Coupling of CO2 and ice sheet stability over major climate transitions of the last 20 million years, Science, 326, 1394–1397, doi:10.1126/science.1178296
  • Tripati, A., Delaney, M.L., Zachos, J.C., Anderson, L.D., Kelly, D.C., and Elderfield, H., 2003, Tropical Sea-Surface Temperature Reconstruction for the Early Paleogene Using Mg/Ca Ratios of Planktonic Foraminifera, Paleoceanography, 18(4), 1101, doi:10.1029/2003PA000937.

References
  1. Funes, Yessenia (2018-02-15). "Green science's white people problem". Grist. Retrieved 2019-10-19.
  2. "UCLA – Earth, Planetary, and Space Sciences | List of Prizes, Awards, and Honors to EPSS Faculty, by Name". epss.ucla.edu. Retrieved 2019-10-19.
  3. "Scholarships". Cal State LA. 2013-10-22. Retrieved 2019-10-19.
  4. Blakemore, Erin (March 9, 2017). "How we know that climate change is happening—and that humans are causing it". Popular Science. Retrieved 2019-10-19.
  5. "What are 'clumped isotopes'? | Carbonate Research". www.carbonateresearch.com. Retrieved 2019-10-19.
  6. Guilford, Gwynn. "The last time CO2 levels were this high, this much water covered what's now Brussels". Quartz. Retrieved 2019-10-19.
  7. Mooney, Chris (February 22, 2016). "Antarctica could be much more vulnerable to melting than we thought". The Washington Post. Retrieved 2019-10-19.
  8. Colgan, David (November 29, 2016). "Study shows major changes in ice and temperatures could cause abrupt effects farther away". phys.org. Retrieved 2019-10-19.
  9. Witze, Alexandra (2011-06-23). "Big dinosaurs kept their cool". Science News. Retrieved 2019-10-19.
  10. Andrei, Mihai (2011-06-26). "Dinosaurs were as warm blooded as today's mammals". ZME Science. Retrieved 2019-10-19.
  11. Feltman, Rachel (October 13, 2015). "Were dinosaurs warm or cold blooded? Ancient eggshells could reveal the truth". The Washington Post. Retrieved 2019-10-19.
  12. Michelson, Molly (October 13, 2015). "How to Measure a Dinosaur's Temperature". California Academy of Sciences. Retrieved 2019-10-19.
  13. "Were dinosaurs hot or not? Fossil eggs shed light on mystery". ABC News. 2015-10-14. Retrieved 2019-10-19.
  14. "NSF Award Search: Award#1352212 - CAREER: CLUMPMAP - Glacial Climate from Clumped Isotope Thermometry". www.nsf.gov. Retrieved 2017-12-07.
  15. "Student group raises awareness for environmental racism with forum". dailybruin.com. 2018-05-10. Retrieved 2019-10-19.
  16. "New center at UCLA raises everyone's voices for environmental science". UCLA. Retrieved 2019-10-19.
  17. AGUvideos. "AGUniverse - 2015, 26 March, Volume 6, Issue 6 - Aradhna Tripati." YouTube. YouTube, 27 Mar. 2015. Web. 20 June 2017
  18. by, Written. "This Jimmy Kimmel Segment Featured More Scientists Discussing Climate Change Than ABC's Top News Shows Did In An Entire Year". Media Matters for America. Retrieved 2019-10-19.
  19. "We answer your climate change questions | Press Play". KCRW. Retrieved 2019-10-19.
  20. "President Obama Honors Federally-Funded Early-Career Scientists". whitehouse.gov. 2017-01-09. Retrieved 2017-12-07.
  21. "Aradhna Tripati named Geological Society of America fellow". Institute of the Environment and Sustainability at UCLA. 2018-05-14. Retrieved 2019-10-17.
  22. "Geological Society of America – 2017 Bromery Award – Aradhna Tripati". www.geosociety.org. Retrieved 2017-12-07.
  23. Science, Kavli Frontiers of (2015-09-09), Pleistocene-to-modern Records of Climate Change – Aradhna Tripati, University of California, Los Angeles, retrieved 2017-12-07
  24. "Renowned Climate Scientist Aradhna Tripati Honored With E.O. Wilson Award". www.biologicaldiversity.org. Retrieved 2017-12-07.
  25. "UCLA – Earth, Planetary, and Space Sciences | News – Professors Mitchell and Tripati ..." epss.ucla.edu. Retrieved 2017-12-07.
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