“Global sensitivity analysis of GEOS-Chem modeled ozone and hydrogen oxides during the INTEX campaigns” [DOI: 10.5194/acp-18-2443-2018], by Kenneth E. Christian, William H. Brune, Jingqiu Mao, and Xinrong Ren was published February 19, 2018 in Atmospheric Chemistry and Physics​. This paper applies a global sensitivity method to the GEOS-Chem chemical transport model to find the model uncertainty for ozone (O3), hydroxyl radical (OH), and hydroperoxyl radical (HO2) mixing ratios and apportion this uncertainty to specific model inputs for the DC-8 flight tracks corresponding to the NASA INTEX campaigns of 2004 and 2006. Modeled results generally agree with measurements when uncertainties in both the model and measurements are taken into account. While model results were largely sensitive to emissions, chemical reaction rates also represented a large source of uncertainty. For ozone and OH, modeled mixing ratios were most sensitive to a bevy of emissions, notably lightning NOx, various surface NOx sources, and isoprene. HO2 mixing ratios were most sensitive to CO 10 and isoprene emissions as well as the aerosol uptake of HO2.

ARL HQ, in collaboration with the University of Maryland, is hosting Mr. Owen Parker of the City College of New York as an intern under the NOAA CREST Scholarship program. Mr. Parker will be with ARL until April 2018, and will work with Drs. Xinrong Ren and Winston Luke in deploying and operating a number of in-situ and remote sensing instruments for measurements of atmospheric trace gases. He will deploy and operate instruments on the roof of the NCWCP Building in College Park, MD, and will also assist Dr. Ren in operating in-situ monitors aboard a Cessna light aircraft as part of the UMD greenhouse gas measurement campaign. Finally, Mr. Parker will assist in preparing a variety of in-situ trace gas sensors (CO, SO2, O3, NO/NOY, NO2, and Hg(0)) for deployment on Hart-Miller Island in the Port of Baltimore for a summer campaign to study the role played by chemistry and transport (land-air-sea interactions) in photochemical ozone generation in a coastal environment. During the aforementioned campaign in spring and summer 2018, where measurements of coastal atmospheric dynamics will be conducted from various platforms including ground-based instruments, aircrafts, and boats in the Chesapeake Bay estuary, Mr. Parker will compare measurements from in-situ sensors (e.g., Cavity Ring Down analyzer) and remote sensing instruments and compare ground-based measurements to satellite observations of coastal air quality.


Dr. Kelsey Ellis will be working at ATDD starting February 26, 2018. She is a visiting scientist who will spend a few months working with Bruce, Temple, Michael, and others on VORTEX-SE and related projects. Dr. Ellis is an Assistant Professor in the Department of Geography at the University of Tennessee, Knoxville and has research interests in natural hazards (i.e., tropical cyclone climatology, tornadoes climatology, risk and vulnerability analyses, historical reconstructions, and spatial climatologies) and human-environment interactions (i.e., microclimates, land use-atmosphere interaction, climate-suicide relationships, and urban microenvironments).  Contact: LaToya.Myles@noaa.gov.

Temple Lee will be making a presentation during the Senior Management Meeting on 26 February.