Speaker : Professor R.V.Krishnamurthy
Western Michigan University, USA
Topic : Study of the Earth's Climate History
Date : January 22nd, 2009
Time : 3:00 PM
Venue : MLS Hall, IACS

All are cordially invited to attend

Abstract: Almost every one is concerned today with the likely changes the earth’s climate is experiencing and seemingly aware of the causes for these changes. What is perhaps less realized is the fact that, during its 4.5 billion years of history our earth has witnessed several cycles of drastic changes in its climate. As recently as 23 thousand years ago-geologically speaking- one third of the earth was covered by ice. In fact severe oscillations in climate was a rule rather than an exception during the so-called Pleistocene Epoch or the past 2.5 millions years. How do we know that this was the case? Earth scientists use a variety of techniques to document the earth’s climate history. One powerful technique, pioneered by the Nobel Prize winning chemist Harold Urey, is based on the use of the stable isotopes of light elements. The talk will present an overview of the theory and practice of this tool. Attention will be paid to the climate history during the past 150 thousand years. Brief reference will also be made to the astronomical theory of Pleistocene glaciations.

About the speaker: Professor R.V.Krishnamurthy obtained his B.Sc (Honors) and M.Sc in Chemistry from the Utkal University and his PhD from the Physical Research Laboratory in Ahmedabad. He then spent seven years as a Fellow of Geochemistry at the California Institute of Technology. In 1993, Dr Krishnamurthy joined the Western] Michigan University as an Associate Professor where he is now a Professor of Geosciences and directs the Stable Isotope Geochemistry Program. He has been a visiting professor at the Max Planck Institute and Helmholtz Institute for Hydrology in Germany as well as the University of Helsinki. In 2005, he delivered the Prof K.R.Ramanathan Lecture at the PRL. Prof Krishnamurthy serves as a regular reviewer for several journals including Science, Nature, Analytical Chemistry, Applied Geochemistry, Geochemica Cosmochimica Acta and agencies such as the National Science Foundation and the National Research Council, U.K.