Best wishes to Crystal McClure for the successful defense of her PhD dissertation on May 7, 2018! Her dissertation—titled Impacts of Biomass Burning on Ozone, Particulate Matter, and Carbon Dioxide in the Northwest U.S.—capped 7 years of solid work in the Jaffe Group.
Dan Jaffe and Crystal McClure celebrate her PhD defense
Crystal is the first author on 2 published papers, 1 recently accepted paper, and 1 paper currently in review. (See her papers on the Publications page.) Later this summer, she will begin a post-doctoral fellowship at UC Davis with Chris Cappa that focuses on the optical properties of black carbon from wildfires.
Crystal offered some sage advice for students, and all of us: “Setbacks are part of the journey. Learn to embrace them and you’ll find that you learn and benefit more from your failures than your successes.” We are so excited for you, Crystal, and will miss you!
The Jaffe Group has kicked off 2018 with 3 new publications.
- Xi Gong, et al., Ozone in China: Spatial distribution and leading meteorological factors controlling O3 in 16 Chinese cities. Gong and her coauthors examined ozone (O3) concentrations in 16 Chinese cities and developed a statistical model to estimate the maximum daily 8-hour (MDA8) O3 during 2014–2016. They found that the Generalized Additive Model (GAM) captured 43-90% of daily O3 variations. They also identified the leading meteorological factors that affect O3 for each city. Read the full paper here.
Average maximum daily 8-hour (MDA8, ug/m3) ozone concentrations for 16 Chinese cities, 2014-2016.
- Pao Baylon, et al., Impact of biomass burning plumes on photolysis rates and ozone formation at the Mount Bachelor Observatory. Baylon and his coauthors examined biomass burning (BB) events at Mt. Bachelor Observatory (MBO) during the summer of 2015. Biomass burning can emit large amounts of aerosols and gases into the atmosphere. These plumes contain compounds that react with sunlight to produce ozone, a health hazard to sensitive individuals. The photochemistry in BB plumes is poorly understand. Baylon and his coauthors addressed this knowledge gap by using MBO data to calculate ozone production rates and comparing these values with modeled values. Read the full paper here.
- Lei Zhang, et al., A quantification method for peroxyacetyl nitrate (PAN) using gas chromatography (GC) with a non-radioactive pulsed discharge detector (PDD). Zhang and his coauthors developed a method for continuous peroxyacetyl nitrate (PAN) measurements using gas chromatography with a non-radioactive detector. PAN is a known precursor of ozone. Their method has high accuracy and is more readily deployable in field campaigns than the traditional gas chromatography method that utilizes a radioactive detector. Read the full paper here.
Congratulations to Pao Baylon for the successful defense of his PhD thesis on May 31, 2017! His dissertation, titled Impact of Stratospheric Intrusions, Regional Wildfires, and Long-Range Transport Events on Air Quality in the Western United States, was the culmination of 6 years of hard work in the Jaffe Group. Pao was the first author on 3 peer-reviewed papers, and his fourth paper is currently in review. (See his papers on the Publications page.) He is now employed at the Idaho Department of Environmental Quality, Air Quality Division.
Members of the Jaffe Group celebrating Pao’s PhD defense: (left to right) James Laing, Pao, Crystal McClure, Lei Zhang, Xi Gong, and Dan Jaffe
Pao shared some advice for graduate students: “Grad school is a cycle of ups and downs, and to survive this journey you should celebrate your triumphs and avoid dwelling on your lows.” And we celebrate you, Pao!
Two Jaffe Group members have published peer-reviewed papers in October. Well done to Xi Gong and Pao Baylon for their outstanding work!
Xi Gong and her coauthors used a statistical approach, the Generalized Additive Model, to quantify ozone impacts from wildfires on 8 US cities. They showed that this approach can provide quantitative support for situations when large contributions from noncontrollable sources, such as wildfires, caused an exceedance of the EPA’s daily ozone standard.
Read the full paper here.
Pao Baylon and his coauthors looked at a Siberian biomass burning event in Spring 2015 that was observed at Mt. Bachelor Observatory and by satellite instruments, and also intercepted by a research aircraft. When the plume was in the eastern Pacific, it split into two plumes, one moving eastward toward MBO and the other moving northeast to Alaska and then south to the US Midwest. The second plume was observed by the aircraft in the Midwest. Baylon et al. found that the ozone production observed at MBO was higher than that of the aircraft plume. This was due to the plume at MBO being warmer and the aircraft plume being colder.
Read the full paper here.
Datasets collected at Mt. Bachelor Observatory from 2004 to 2016 are now permanently archived and publicly available in the University of Washington ResearchWorks archive. The datasets include observations of ozone, carbon monoxide, mercury, nitrogen oxides, particulate matter and other atmospheric constituents. You can find the data by searching for Mt. Bachelor Observatory.
MBO datasets in UW ResearchWorks
UW ResearchWorks Archive