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Exploring the Potential for Developing the Capacity to Do Isotope Research at the National University of Singapore
15 February 2016 (Monday), 12pm
About the Talk
Studies on the natural abundances of hydrogen and oxygen stable isotopes in water within plants have provided new information on water sources, competitive interactions, and water-use patterns under natural conditions. However, not until relatively recently have the dual isotopes of water (δ2H/δ18O) been used together to assess plant water source. And what this approach is saying challenges the fundamental notions of where plants get their water, the nature of belowground water mixing, source apportionment and compartmentalization in the hydrological cycle. Building on a limited number of field studies, recent global-in-scale meta-analysis shows that plants are using water that is much more bound than hydrologists would ever have thought. In fact, this work suggests that there are effectively two water worlds—one pool of water in the subsurface that supplies plant transpiration and another pool in the subsurface that forms the downward percolation to groundwater and streamflow generation. Now, with remotely-sensed Tropospheric Emissions Spectrometer data for δ2H-vapor aboard NASA’s Aura satellite, it appears that this behavior is more common than initially assumed. Here we will suggest a few implications of this new knowledge, in particular; and explore the utility of stable water isotopes in understanding the water cycle – relevant to ecosystems, humanity and the Earth’s climate, in general.
About the Speaker
Jaivime Evaristo is a PhD candidate at the Global Institute for Water Security in Saskatchewan, Canada. He obtained a BS in Biology (major in Cell Biology) from the University of the Philippines-Mindanao in 2001. After several years of career in the industry, Jaivime went back to graduate school and obtained an MS in Applied Geosciences (major in Hydrogeology) at the University of Pennsylvania (UPenn). At UPenn, Jaivime was awarded with the Dean’s Scholar Award in 2013 for his distinguished graduate record and for his work in stable isotope ecohydrology in Puerto Rico, as part of the Critical Zone Observatory program of the US National Science Foundation. He then moved to Canada to pursue a PhD with Dr. Jeffrey J. McDonnell, an internationally-recognized hydrologist and President-Elect of the 7000-strong Hydrology Section of the American Geophysical Union. In Canada, Jaivime is two-time recipient of the Saskatchewan Innovation and Opportunity Scholarship, a prestigious scholarship awarded to students whose research advances understanding in the fields of water security and environmental sustainability. Jaivime’s research has taken him to international scientific conferences and workshops in Rennes (France), Florence (Italy), Scotland (UK), and various parts of the United States and Canada between 2013 and 2015. In September 2015, Jaivime’s work was published in the journal Nature, showing global-in-scale evidence for ecohydrological separation and potentially overturning existing paradigm on the coupling between plant transpiration and groundwater recharge and streamflow generation.
More on Jaivime Evaristo: http://www.usask.ca/watershed/people/Jaivime%20Evaristo.php