Atmospheric Processes and Composition Group

Rachel Chang,

Rachel completed all her education at University of Toronto with a BASc in Engineering Science and an MASc in Chemical Engineering under the supervision of Professors Greg Evans and Jon Abbatt. Her PhD was completed with Jon Abbatt where she studied the ability of the organic component of ambient particles to absorb water as well as the sources and chemical composition of Arctic aerosol. She was an NSERC post-doctoral fellow at Harvard University with Steve Wofsy where she constrained methane emissions from permafrost regions using aircraft measurements over Alaska.

John MacInnis,

John graduated with a BSc in Chemistry from Cape Breton University in 2013 and a PhD in Chemistry from Memorial University in 2020. His PhD research focused on understanding the transport and fate of per- and polyfluoroalkyl substances to Arctic regions in Canada. His current research focuses on understanding the source and chemical composition of aerosol particles and occurrence of fog in the Northwest Territories.

Baban Nagare,

Baban graduated PhD from ETH Zurich, Switzerland in 2016. His PhD work was focused on process level understanding of ice formation in mixed phase cloud regime. He joined Prof. Chang’s group in 2018 as post doctoral fellow and working on aerosol chemistry and fog microphysics.

Sean Hartery,

Sean Hartery completed a B.Sc. in Physics (Hons.) with a Minor in Mathematics at Dalhousie University in 2015. During this time, Sean also worked as a research assistant for the Atmospheric Processes and Composition Group (APCG) investigating environmental trends in methane emissions from Alaskan wetlands. After leaving the APCG, Sean joined the McDonald group at the University of Canterbury, where he completed a PhD. His thesis was titled "Aerosol Cloud Interactions over the Southern Ocean." In this work, a comprehensive set of in situ field observations collected in the Ross Sea were analyzed to understand how sea spray aerosol particles directly, and indirectly, influence the regional climate of the Southern Ocean. In 2020, Sean rejoined the APCG as a research assistant. In the wake of COVID-19, he has helped design, run and maintain a Filtering Facepiece Respirator (FFR) testing facility in collaboration with the Health and Environment Research Centre. In 2021, Sean will commence postdoctoral work with Dalhousie's Automated Wave Tank (DAWT) to study the effects of surfactants on the air-sea flux and hygroscopicity of sea spray particles.

Joelle Dionne,

Joelle completed a BSc Honours in Mathematics at the University of British Columbia and a Diploma in Meteorology at Dalhousie University. They finished the MSc program in Dalhousie University’s Physics and Atmospheric Science department, with co-supervision from Dr. Rachel Chang and Dr. Ian Folkins. Their master's research focused on applying aircraft data to a single column model to study the effects of some autoconversion parameterizations on the reproduction of some low cloud microphysical and radiative properties in the Arctic. They are now working on a PhD supervised by Dr. Rachel Chang.

Patrick Duplessis,

Patrick completed a minor in Chemistry at Université de Montréal and a B.Sc. in Earth and Atmospheric Sciences at Université du Québec à Montréal with a meteorology major. He has done two summer internships at UQÀM during which he studied rapid ice-loss events (RILEs) in the Arctic and the role of the snowflake type in the flood of Southern Alberta of 2013. He is currently a Ph.D. student in the Physics and Atmospheric Science department under the supervision of Dr. Rachel Chang and Dr. Randall Martin and is also part of the TOSST program. His project consists in investigating the microphysical properties of marine and coastal fog.

Liam Kroll,

Liam completed a (Hon.) BSc in Physics from McMaster University. He is currently a MSc student in the Department of Physics and Atmospheric Sciences under the supervision of Dr. Rachel Chang. His project will analyze microphysical and optical properties of surface Arctic aerosols alongside LIDAR data from the Polar Environment Atmospheric Research Laboratory to gain a better understanding of the differences and similarities between Arctic aerosols near the surface, and aloft. This study will be complemented by some aerosol transport modelling, with a focus on the radiative effects of these aerosols.

Past Members

Nicole Chisholm, MSc, 2017-2020

Changshuo Chen, Visiting PhD student, 2017-2019

Jai Prakash Chaubey, Post Doctoral Fellow, 2017-2019

Amanda Mercer, MSc, 2014-2017

Matt Boyer, MSc, 2014-2017

Lauren Utter, Summer student, Summer 2017

Fran MacWilliam, Summer student, Summer 2017

Sonja Bhatia, Post Doctoral Fellow, 2016

Sean Hartery, Honours student & research assistant, 2014-2016

Jeff Miller, Summer student, Summer 2016

Cody Boudreau, Co-op student, Fall 2015

Ashley Drodge, Co-op student, Summer 2015