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  • 11
    Online Resource
    Online Resource
    Sensitivity of Ozone Production to NO x and VOC Along the Lake Michigan Coastline
    American Geophysical Union (AGU) ; 2019
    In:  Journal of Geophysical Research: Atmospheres Vol. 124, No. 20 ( 2019-10-27), p. 10989-11006
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 124, No. 20 ( 2019-10-27), p. 10989-11006
    Abstract: Direct observations of H 2 O 2 /HNO 3 at an urban plume endpoint can be used to assess the integrated O 3 sensitivity to NO x and VOC emissions Indicators of O 3 sensitivity show that the urban plume traveling over Lake Michigan evolves from VOC towards NO x ‐sensitive O 3 production O 3 , H 2 O 2 , HNO 3 , and NO 3 − provide unique constraints to predict the response of O 3 to changes in VOC and NO x emissions in coastal regions
    Type of Medium: Online Resource
    ISSN: 2169-897X , 2169-8996
    URL: Article
    DOI: 10.1029/2019JD030842
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2019
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    detail.hit.zdb_id: 2016800-7
    detail.hit.zdb_id: 2969341-X
    SSG: 16,13
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  • 12
    Online Resource
    Online Resource
    Simultaneous Measurements of O 3 and HCOOH Vertical Fluxes Indicate Rapid In‐Canopy Terpene Chemistry Enhances O 3 Removal Over Mixed Temperate Forests
    American Geophysical Union (AGU) ; 2021
    In:  Geophysical Research Letters Vol. 48, No. 3 ( 2021-02-16)
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 48, No. 3 ( 2021-02-16)
    Abstract: The daily maximum deposition velocity of O 3 to a mixed temperate forest in Northern WI in July ranged between 0.5 and 1.2 cm s −1 The missing nonstomatal fraction of O 3 deposition ranged between 10% and 90% of the total deposition in a given hour HCOOH fluxes are correlated with nonstomatal O 3 deposition, suggesting fast in‐canopy ozonolyzis of terpenes
    Type of Medium: Online Resource
    ISSN: 0094-8276 , 1944-8007
    URL: Article
    DOI: 10.1029/2020GL090996
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2021
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    SSG: 16,13
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  • 13
    Online Resource
    Online Resource
    Oceanic emissions of dimethyl sulfide and methanethiol and their contribution to sulfur dioxide production in the marine atmosphere
    Copernicus GmbH ; 2022
    In:  Atmospheric Chemistry and Physics Vol. 22, No. 9 ( 2022-05-17), p. 6309-6325
    Details
    In: Atmospheric Chemistry and Physics, Copernicus GmbH, Vol. 22, No. 9 ( 2022-05-17), p. 6309-6325
    Abstract: Abstract. Oceanic emissions of dimethyl sulfide (CH3SCH3, DMS) have long been recognized to impact aerosol particle composition and size, the concentration of cloud condensation nuclei (CCN), and Earth's radiation balance. The impact of oceanic emissions of methanethiol (CH3SH, MeSH), which is produced by the same oceanic precursor as DMS, on the volatile sulfur budget of the marine atmosphere is largely unconstrained. Here we present direct flux measurements of MeSH oceanic emissions using the eddy covariance (EC) method with a high-resolution proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToFMS) detector and compare them to simultaneous flux measurements of DMS emissions from a coastal ocean site. Campaign mean mixing ratios of DMS and MeSH were 72 ppt (28–90 ppt interquartile range) and 19.1 ppt (7.6–24.5 ppt interquartile range), respectively. Campaign mean emission fluxes of DMS (FDMS) and MeSH (FMeSH) were 1.13 ppt m s−1 (0.53–1.61 ppt m s−1 interquartile range) and 0.21 ppt m s−1 (0.10–0.31 ppt m s−1 interquartile range), respectively. Linear least squares regression of observed MeSH and DMS flux indicates the emissions are highly correlated with each other (R2=0.65) over the course of the campaign, consistent with a shared oceanic source. The campaign mean DMS to MeSH flux ratio (FDMS:FMeSH) was 5.5 ± 3.0, calculated from the ratio of 304 individual coincident measurements of FDMS and FMeSH. Measured FDMS:FMeSH was weakly correlated (R2=0.15) with ocean chlorophyll concentrations, with FDMS:FMeSH reaching a maximum of 10.8 ± 4.4 during a phytoplankton bloom period. No other volatile sulfur compounds were observed by PTR-ToFMS to have a resolvable emission flux above their flux limit of detection or to have a gas-phase mixing ratio consistently above their limit of detection during the study period, suggesting DMS and MeSH are the dominant volatile organic sulfur compounds emitted from the ocean at this site. The impact of this MeSH emission source on atmospheric budgets of sulfur dioxide (SO2) was evaluated by implementing observed emissions in a coupled ocean–atmosphere chemical box model using a newly compiled MeSH oxidation mechanism. Model results suggest that MeSH emissions lead to afternoon instantaneous SO2 production of 2.5 ppt h−1, which results in a 43 % increase in total SO2 production compared to a case where only DMS emissions are considered and accounts for 30% of the instantaneous SO2 production in the marine boundary layer at the mean measured FDMS and FMeSH. This contribution of MeSH to SO2 production is driven by a higher effective yield of SO2 from MeSH oxidation and the shorter oxidation lifetime of MeSH compared to DMS. This large additional source of marine SO2 has not been previously considered in global models of marine sulfur cycling. The field measurements and modeling results presented here demonstrate that MeSH is an important contributor to volatile sulfur budgets in the marine atmosphere and must be measured along with DMS in order to constrain marine sulfur budgets. This large additional source of marine–reduced sulfur from MeSH will contribute to particle formation and growth and CCN abundance in the marine atmosphere, with subsequent impacts on climate.
    Type of Medium: Online Resource
    ISSN: 1680-7324
    URL: Article
    URL: Article
    DOI: 10.5194/acp-22-6309-2022
    DOI: 10.5194/acp-22-6309-2022-supplement
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2022
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  • 14
    Online Resource
    Online Resource
    Overview of the Lake Michigan Ozone Study 2017
    American Meteorological Society ; 2021
    In:  Bulletin of the American Meteorological Society Vol. 102, No. 12 ( 2021-12), p. E2207-E2225
    Details
    In: Bulletin of the American Meteorological Society, American Meteorological Society, Vol. 102, No. 12 ( 2021-12), p. E2207-E2225
    Abstract: The Lake Michigan Ozone Study 2017 (LMOS 2017) was a collaborative multiagency field study targeting ozone chemistry, meteorology, and air quality observations in the southern Lake Michigan area. The primary objective of LMOS 2017 was to provide measurements to improve air quality modeling of the complex meteorological and chemical environment in the region. LMOS 2017 science questions included spatiotemporal assessment of nitrogen oxides (NO x = NO + NO 2 ) and volatile organic compounds (VOC) emission sources and their influence on ozone episodes; the role of lake breezes; contribution of new remote sensing tools such as GeoTASO, Pandora, and TEMPO to air quality management; and evaluation of photochemical grid models. The observing strategy included GeoTASO on board the NASA UC-12 aircraft capturing NO 2 and formaldehyde columns, an in situ profiling aircraft, two ground-based coastal enhanced monitoring locations, continuous NO 2 columns from coastal Pandora instruments, and an instrumented research vessel. Local photochemical ozone production was observed on 2 June, 9–12 June, and 14–16 June, providing insights on the processes relevant to state and federal air quality management. The LMOS 2017 aircraft mapped significant spatial and temporal variation of NO 2 emissions as well as polluted layers with rapid ozone formation occurring in a shallow layer near the Lake Michigan surface. Meteorological characteristics of the lake breeze were observed in detail and measurements of ozone, NO x , nitric acid, hydrogen peroxide, VOC, oxygenated VOC (OVOC), and fine particulate matter (PM 2.5 ) composition were conducted. This article summarizes the study design, directs readers to the campaign data repository, and presents a summary of findings.
    Type of Medium: Online Resource
    ISSN: 0003-0007 , 1520-0477
    URL: Article
    DOI: 10.1175/BAMS-D-20-0061.1
    Language: Unknown
    Publisher: American Meteorological Society
    Publication Date: 2021
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    detail.hit.zdb_id: 419957-1
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