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
The Jaffe Group has published 4 first-author papers so far this year. Stay tuned for more! Click the following links to see each paper:
- James Laing, Dan Jaffe, Abbigale Slavens, Wenting Li, and Wenxi Wang, Can ΔPM2.5/ΔCO and ΔNOy/ΔCO enhancement ratios be used to characterize the influence of wildfire smoke in urban areas? Aerosol and Air Quality Research, doi: 10.4209/aaqr.2017.02.0069.
- Honglian Gao and Dan Jaffe, Comparison of ultraviolet absorbance and NO-chemiluminescence for ozone measurement in wildfire plumes at the Mount Bachelor Observatory. Atmospheric Environment 166, 224–233, doi: 10.1016/j.atmosenv.2017.07.007.
- Lei Zhang and Dan Jaffe, Trends and sources of ozone and sub-micron aerosols at the Mt. Bachelor Observatory (MBO) during 2004–2015. Atmospheric Environment 165, 143–154, doi: 10.1016/j.atmosenv.2017.06.042.
- Dan Jaffe and Lei Zhang, Meteorological anomalies lead to elevated O3 in the western U.S. in June 2015. Geophysical Research Letters 44, 1990–1997, doi: 10.1002/2016GL072010.
Aerobiology workshop participants in Bend, Oregon – May 2017
The Jaffe Group (specifically, Dan and Dee Ann) along with Andrew C. Schuerger of the University of Florida, Space Life Sciences Lab, organized a NASA-funded workshop in Bend, Oregon, at the beginning of May. This workshop gathered researchers from several universities and agencies to discuss a future experiment in “Aerobiology.” This is the study of the transport and biology of microbes in the atmosphere. Researchers plan to use Mt. Bachelor as a key sampling location to study the long-range transport of microbes in the global atmosphere. David Smith, now at NASA Ames Research Center, was one of the workshop participants. He is a UW alum (PhD Biology) and previously did ground-breaking work on aerobiology at Mt. Bachelor Observatory (see publications in 2011-2013).
In addition to PI Andrew Schuerger, David Smith, and Dan Jaffe, other participants were Co-PI Dale W. Griffin (US Geological Survey), Susannah M. Burrows (Pacific Northwest National Laboratory), Brent C. Christner (University of Florida), Cristina Gonzalez-Martin (University of La Laguna, Tenerife, Spain), Erin K. Lipp (University of Georgia), David G. Schmale (Virginia Tech), Boris Wawrik (University of Oklahoma), and Hongbin Yu (University of Maryland and NASA Goddard Space Flight Center).
Look for a future project studying microbes in the sky!