Welcome to the Pratt Lab blog! Dr. Kerri Pratt is an assistant professor in the Departments of Chemistry and Earth & Environmental Sciences and faculty associate of the Program in the Environment at the University of Michigan. We study atmospheric trace gases, particles, snow, and clouds and their interactions with the biosphere (forests) and cryosphere (snow and sea ice). Our interdisciplinary research has relevance to climate change, air quality, and human health. As an analytical chemistry lab, we primarily use novel mass spectrometry techniques during our field research. We invite you to follow our adventures in (and outside!) the lab!

Saturday, March 18, 2017

Grand Prize for Rashad at 60th Science & Engineering Fair of Metropolitan Detroit!

Congratulations to summer 2016 D-RISE Pratt Lab researcher Rashad Prendergast (Cass Technical High School) for being awarded in the Grand Prize in the Senior Division (Category: Earth & Environmental Sciences) at the 60th Science & Engineering Fair of Metropolitan Detroit for his summer research and poster titled "Impact of Road Salt Usage on Atmospheric Concentrations of Cl and Na PM2.5"! Rashad will now go to compete at the Intel International Science and Engineering Fair in Los Angeles in May! Good luck Rashad!

Sunday, March 12, 2017

New paper on dust composition in the Taylor Glacier (East Antarctica)!

Congratulations to Sarah Aarons (recent PhD in the Aciego group at the University of Michigan) on her recent paper on "Dust composition changes from Taylor Glacier (East Antarctica) during the last glacial-interglacial transition: A multi-proxy approach" published in Quaternary Science Reviews! Pratt lab PhD student Nate May and Prof. Pratt are co-authors.

Monday, February 6, 2017

Welcome Natasha!

Welcome Natasha Garner! Natasha is a third-year PhD student in Prof. Hans Osthoff's group at the University of Calgary. She is visiting for two months to learn about Arctic halogen chemistry and participate in analysis and interpretation of our gigantic chemical ionization mass spectrometry dataset from Utqiaġvik, Alaska in spring 2016!

Sunday, February 5, 2017

Pratt/Ault Lab Weekend Getaway at UMBS

Pratt and Ault lab members took a weekend away from the lab to get out and explore the beautiful University of Michigan Biological Station (UMBS) during the winter. There was plenty of snow for skiing and snowshoeing during the day. We also took a trip across the Mackinac Bridge to the Upper Peninsula for lunch and to get a view of Lake Michigan and Lake Huron. In the cabin there was a wonderful fireplace to keep us warm while we exercised our creative skills by putting together puzzles and playing Trivial Pursuit. It was nice to spend some time outside and to relax with fellow group members!
A view of the cabins
Rachel on skis
Katie jumping on the frozen lake
Kerri teaching Oskar how to ski
Stephen made a fire to keep us all warm - perhaps in the future we can study biomass burning aerosols here!
Ryan on the edge of Lake Huron
Matt copying Ryan

Tuesday, January 31, 2017

Pratt Lab attends the 2016 American Geophysical Union Fall Meeting

Prof. Kerri Pratt and post-docs Dr. Peter Peterson and Dr. Katheryn Kolesar, along with Ph.D. students Matt Gunsch, Rachel Kirpes, and Stephen McNamara, presented their results from a number of different Arctic research projects currently ongoing in the group! The 2016 Fall Meeting was a week-long conference in San Francisco (Dec 12-16, 2016) that attracted tens of thousands of scientists in earth science-related fields to share their work and engage in productive discussions. It was also a great opportunity to network and touch base with many of our collaborators!

The following presentations were given by Pratt Lab members:

Prof. Kerri Pratt: The poster "Influences on Summertime Arctic Aerosol Chemical Mixing States" highlighted work by Rachel Kirpes and Matt Gunsch. Prof. Pratt also co-organized the "Chemical Exchange Between the Air, Snow, and Ice: From the Micro to the Global Scale" Cryosphere session.

Dr. Peter Peterson: The oral presentation "Airborne Observations of Reactive Bromine Transport in the Arctic" featured airborne reactive bromine and particle measurements collected during the BROMEX 2012 study near Utqiagvik (Barrow), AK.

Dr. Katheryn Kolesar: The oral presentation "Prudhoe Bay Emissions Drive Particle Growth Events Observed in Utqiagvik (Barrow), AK" highlighted our recently published analysis of years of aerosol data that show evidence of influence by the oil fields at Prudhoe Bay upwind from Utqiagvik (Barrow), AK.

Matt Gunsch: The poster presentation "Chemical Characterization of Atmospheric Particulate Matter from Prudhoe Bay, Alaska" featured results from our 2016 summer field study in the Prudhoe Bay oil fields of Alaska's North Slope.
Matt Gunsch and his poster
Rachel Kirpes: The poster "The Chemical Composition and Mixing State of Sea Spray Aerosol and Organic Aerosol in the Winter-Spring Arctic" examined particles collected on recent Arctic field studies for their unique chemical characteristics to aid our understanding of their effects on radiative forcing and cloud formation.
Rachel Kirpes and her poster
Stephen McNamara: The poster "The Influence of Nitrogen Oxides on Chlorine Chemistry in Utqiagvik (Barrow), Alaska" presented results from our 2016 winter-spring field study at Utqiagvik (Barrow) in which high amounts of chlorine species were observed episodically using chemical ionization mass spectrometry.
Stephen McNamara and his poster

Wednesday, January 25, 2017

Welcome Nicole, Garret, Annie, Guy, Logan, and Madeline!

Welcome winter semester graduate rotation students Nicole Olson and Garret Verwer! Nicole received her B.S. degree in Chemistry in 2016 from Edgewood College, and Garret received his B.S. degree in Chemistry in 2016 from Mercyhurst University.

Belated welcome to Annie Barget, a senior undergraduate student (major: Biomolecular Sciences), who joined the Pratt Lab in Fall 2016 to study Arctic snow chemical composition using ion chromatography!

Welcome to new Pratt Lab undergraduate students Guy, Logan, and Madeline! Guy Burke is a junior undergraduate student (majors: Chemistry & Spanish) who previously completed research in environmental engineering. Logan Vear and Madeline Parks are first-year undergraduate students who completed the Chem 125-Snow (General Chemistry Laboratory - Authentic Research Experience in Snow Chemistry) course with Prof. Pratt in Fall 2016.