A5041169772- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Cryospheric studies and observations
- Atmospheric Ozone and Climate
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Air Quality and Health Impacts
- Isotope Analysis in Ecology
- Hydrocarbon exploration and reservoir analysis
- Archaeology and ancient environmental studies
- Air Quality Monitoring and Forecasting
- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Superconducting Materials and Applications
- Spacecraft and Cryogenic Technologies
- Winter Sports Injuries and Performance
- Radioactive contamination and transfer
- Advanced Chemical Sensor Technologies
- Atmospheric aerosols and clouds
- CO2 Sequestration and Geologic Interactions
- Mass Spectrometry Techniques and Applications
- Smart Materials for Construction
- Vehicle emissions and performance
- Fire effects on ecosystems
- Spectroscopy and Laser Applications
University of Rochester
2016-2025
Stony Brook University
2024
University of New Hampshire
2009-2024
Lead pollution in Arctic ice reflects large-scale historical changes midlatitude industrial activities such as ancient lead/silver production and recent fossil fuel burning. Here we used measurements a broad array of 13 accurately dated cores from Greenland Severnaya Zemlya to document spatial temporal lead 200 BCE 2010 CE, with interpretation focused on 500 CE. Atmospheric transport modeling indicates that was primarily European emissions before the 19th-century Industrial Revolution....
Abstract. Carbon monoxide (CO) is a regulated pollutant and one of the key components determining oxidizing capacity atmosphere. Obtaining reliable record atmospheric CO mixing ratios ([CO]) since preindustrial times necessary to evaluate climate–chemistry models under conditions different from today constrain past sources. We present high-resolution measurements ice cores drilled at five sites on Greenland sheet that experience range snow accumulation rates, mean surface temperatures,...
Abstract. Global chemistry–climate models (CCMs) play an important role in assessing the climate and air pollution implications of aerosols chemically reactive gases. Evaluating these under past conditions constraining historical sources sinks necessitate reliable records atmospheric mixing ratios spanning preindustrial times. Such precious were recently obtained for carbon monoxide (CO), documenting first time evolution this compound over industrial era. In study, we compare simulated...
Ambient aerosol samples ( n = 287) collected at a semi‐rural location, Thompson Farm (TF) in Durham, New Hampshire, from August 2007 to 2008 exhibited seasonal variation, characterized by the largest total carbon (TC) concentrations during winter (3.74 ± 2.55 μ g C m −3 ) and smallest summer (1.21 1.22 ). On average, 92% of TC was organic (OC), which 69% on average observed be water‐soluble (WSOC). This study focuses characterizing WSOC functional groups using Proton Nuclear Magnetic...
We present measurements of CO mole fraction and stable isotopes (δ13CO δC18O) in air during the winters 2013–14 2014–15 at tall tower sampling sites around Indianapolis, USA. A located upwind city was used to quantitatively remove background signal, allowing for first unambiguous isotopic characterization urban source yielding 13CO –27.7 ± 0.5‰ VPDB C18O 17.7 1.1‰ VSMOW this source. use isotope measurements, results from a limited traffic study, as well atmospheric reaction rates examine...
Abstract. Atmospheric carbon monoxide (CO) is a key player in global atmospheric chemistry and regulated pollutant urban areas. Oxidation of volatile organic compounds (VOCs) an important component the CO budget has also been hypothesized to contribute substantially summertime budget. In principle, stable isotopic analysis could constrain magnitude this source. However, signature VOC-produced not well quantified, especially for oxygen isotopes. We performed measurements isotopes on air...
Abstract. Cosmic rays entering the Earth's atmosphere produce showers of secondary particles such as protons, neutrons, and muons. The interaction these with oxygen-16 (16O) in minerals ice quartz can carbon-14 (14C). In glacial ice, 14C is also incorporated through trapping 14C-containing atmospheric gases (14CO2, 14CO, 14CH4). Understanding production rates situ cosmogenic important to deconvolve signals both which contain valuable paleoenvironmental information. Unfortunately, by muons...
Abstract. Measurements of carbon-14-containing carbon monoxide (14CO) in glacial ice are useful for studies the past oxidative capacity atmosphere as well reconstructing cosmic ray flux. The 14CO abundance represents combination trapped atmospheric and situ cosmogenic 14CO. systematics production retention not fully quantified, posing an obstacle to interpretation core measurements. Here we provide first comprehensive characterization at accumulation site (Summit, Greenland), including...
Abstract. Important uncertainties remain in our understanding of the spatial and temporal variability atmospheric hydroxyl radical concentration ([OH]). Carbon-14-containing carbon monoxide (14CO) is a useful tracer that can help characterization [OH] variability. Prior measurements 14CO ([14CO] are limited both their extent, partly due to very large air sample volumes have been required for (500–1000 L at standard temperature pressure, STP) difficulty expense associated with collection,...
Abstract Because of its global abundance and reactivity with hydroxyl radicals (OH•), tropospheric carbon monoxide indirectly impacts the lifetimes other OH•‐reactive gases, in particular methane reactive hydrocarbons. The origin chemistry atmospheric CO have been studied using stable isotopes. Both 13 C 18 O undergo isotopic fractionation during main chemical loss reaction, + OH•. kinetic isotope effect (KIE) for is mass dependent, a value ∼5‰; 12 reacts faster than OH. Whereas OH• exhibits...
Abstract. Atmospheric carbon monoxide (CO) is a regulated pollutant in urban centers. Oxidation of volatile organic compounds (VOCs) has been hypothesized to contribute substantially the summertime CO budget. We performed measurements stable isotopes on air samples from three sites and around Indianapolis, USA over summers investigate VOC contribution CO. One located upwind city, allowing us quantitatively remove background signal isolate enhancements. The distinct isotopic signatures...
Supplement for "Characterization of in situ cosmogenic 14 CO production, retention and loss firn shallow ice at Summit, Greenland" by Hmiel et al.Table S1: Measurements associated corrections Summit 2013 air samples.5All uncertainties represent ± 1σ.Measured pMC values shown are after the empirical correction ANSTO processing.The procedural blanks were not measured δ 13 a value -32.5 7.5 ‰ is assumed instead; this large uncertainty does make significant impact on final [ CO] since carbon...
Abstract. Measurements of carbon-14-containing carbon monoxide (14CO) in glacial ice are useful for studies the past oxidative capacity atmosphere as well reconstructing cosmic ray flux. 14CO abundance represents combination trapped atmospheric and situ cosmogenic 14CO. The systematics production retention not fully quantified, posing an obstacle to interpretation core measurements. Here we provide first comprehensive characterization at accumulation site (Summit, Greenland), including...