Headshot of Aparajeo Chattopadhyay.

Aparajeo Chattopadhyay

  • Scientist, Petrenko Lab

PhD, Physical Chemistry, Indian Association for the Cultivation of Science, India, 2018

B03 Hutchison Hall

Research Overview

I am an atmospheric chemist as well as an experimental physical chemist with extensive experience in laboratory-based investigations of atmospheric chemical processes related to air quality and climate change.  In the Ice core and atmospheric chemistry laboratory, I plan to work with atmospheric and ice core samples to understand trends in methane (CH4), a major greenhouse gas as well as hydroxyl (OH) radical which is the main atmospheric oxidant.  My research will also include measuring kinetic isotope effect for OH+CH4 reaction to improve model uncertainties in CH4 budget.  I shall also be involved in atmospheric monitoring of key greenhouse gases.  In future, I plan to study chemistry of atmospheric pollutants and emerging greenhouse gases in the laboratory as well.


Research Interests

  • Atmospheric chemistry: air quality and climate change
  • Global methane (CH4) budget
  • Hydroxyl (OH) radical abundance in the past and modern atmosphere
  • Gas kinetics, photochemistry, and spectroscopy
  • Ice cores
  • Atmospheric monitoring

Selected Publications

Past Appointments

Research Scientist, NOAA Chemical Sciences Laboratory and CIRES, University of Colorado Boulder, Boulder, Colorado, USA. 2018-2023


  • Member, American Geophysical Union, USA (AGU), 2019 – present.
  • Member, Royal Society of Chemistry, UK (MRSC), 2020 - present.
  • Associate Member, Royal Society of Chemistry, UK (AMRSC), 2016 - 2020.


  • Researcher Development Grant, 2022, by the Royal Society of Chemistry, UK.
  • Newton International Fellowship Award, 2018, by the Royal Society, UK, and SERB, India (declined).
  • International Travel Grant from the SERB, Govt. of India for attending the 24th International Symposium on Gas Kinetics and Related Phenomena 2016 at the University of York, UK.
  • Best Poster Presentation Award at the National Symposium on Radiation and Photochemistry (NSRP) 2015 held at IIT Kanpur, India.
  • Best Poster Presentation Award at the National Symposium on Radiation and Photochemistry (NSRP) 2013 held at NEHU, Shillong, India.
  • CSIR - Junior Research Fellowship (JRF) 2011 through NET by CSIR, Govt. of India for pursuing Ph.D. in Universities and Research Institutes in India.