Search Results - "Tonnesen, Gail"

US surface ozone trends and extremes from 1980 to 2014: quantifying the roles of rising Asian emissions, domestic controls, wildfires, and climate by Lin, Meiyun, Horowitz, Larry W, Payton, Richard, Fiore, Arlene M, Tonnesen, Gail

“…US surface O3 responds to varying global-to-regional precursor emissions, climate, and extreme weather, with implications for designing effective air quality…”
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Evaluating a Space‐Based Indicator of Surface Ozone‐NOx‐VOC Sensitivity Over Midlatitude Source Regions and Application to Decadal Trends by Jin, Xiaomeng, Fiore, Arlene M., Murray, Lee T., Valin, Lukas C., Lamsal, Lok N., Duncan, Bryan, Folkert Boersma, K., De Smedt, Isabelle, Abad, Gonzalo Gonzalez, Chance, Kelly, Tonnesen, Gail S.

“…Determining effective strategies for mitigating surface ozone (O3) pollution requires knowledge of the relative ambient concentrations of its precursors, NOx,…”
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Scientific assessment of background ozone over the U.S.: Implications for air quality management by Jaff, Daniel A, Cooper, Owen R, Fiore, Arlene M, Henderson, Barron H, Tonnesen, Gail S, Russell, Armistead G, Henze, Daven K, Langford, Andrew O, Lin, Meiyun, Moore, Tom

“…Ozone (O ) is a key air pollutant that is produced from precursor emissions and has adverse impacts on human health and ecosystems. In the U.S., the Clean Air…”
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Changes in Ozone Chemical Sensitivity in the United States from 2007 to 2016 by Koplitz, Shannon, Simon, Heather, Henderson, Barron, Liljegren, Jennifer, Tonnesen, Gail, Whitehill, Andrew, Wells, Benjamin

“…Anthropogenic nitrogen oxide (NO x ) and volatile organic compound (VOC) emissions in the United States have declined substantially over the last decade,…”
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Comparison of background ozone estimates over the western United States based on two separate model methodologies by Dolwick, Pat, Akhtar, Farhan, Baker, Kirk R., Possiel, Norm, Simon, Heather, Tonnesen, Gail

“…Two separate air quality model methodologies for estimating background ozone levels over the western U.S. are compared in this analysis. The first approach is…”
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New insights into the column CH2O/NO2 ratio as an indicator of near‐surface ozone sensitivity by Schroeder, Jason R., Crawford, James H., Fried, Alan, Walega, James, Weinheimer, Andrew, Wisthaler, Armin, Müller, Markus, Mikoviny, Tomas, Chen, Gao, Shook, Michael, Blake, Donald R., Tonnesen, Gail S.

“…Satellite‐based measurements of the column CH2O/NO2 ratio have previously been used to estimate near‐surface ozone (O3) sensitivity (i.e., NOx or VOC limited),…”
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Development of a tagged species source apportionment algorithm to characterize three-dimensional transport and transformation of precursors and secondary pollutants by Wang, Zion S., Chien, Chao-Jung, Tonnesen, Gail S.

“…We developed a new tagged species source apportionment (TSSA) algorithm for tracking the direct mass contributions of selected emissions sources to the…”
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Nitrogen Emissions, Deposition, and Monitoring in the Western United States by FENN, MARK E, HAEUBER, RICHARD, TONNESEN, GAIL S, BARON, JILL S, GROSSMAN-CLARKE, SUSANNE, HOPE, DIANE, JAFFE, DANIEL A, COPELAND, SCOTT, GEISER, LINDA, RUETH, HEATHER M, SICKMAN, JAMES O

“…Nitrogen (N) deposition in the western United States ranges from 1 to 4 kilograms (kg) per hectare (ha) per year over much of the region to as high as 30 to 90…”
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Modeling NH4NO3 Over the San Joaquin Valley During the 2013 DISCOVER‐AQ Campaign by Kelly, James T., Parworth, Caroline L., Zhang, Qi, Miller, David J., Sun, Kang, Zondlo, Mark A., Baker, Kirk R., Wisthaler, Armin, Nowak, John B., Pusede, Sally E., Cohen, Ronald C., Weinheimer, Andrew J., Beyersdorf, Andreas J., Tonnesen, Gail S., Bash, Jesse O., Valin, Luke C., Crawford, James H., Fried, Alan, Walega, James G.

“…The San Joaquin Valley (SJV) of California experiences high concentrations of particulate matter NH4NO3 during episodes of meteorological stagnation in winter…”
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Size distribution of sea-salt emissions as a function of relative humidity by Zhang, K. Max, Knipping, Eladio M., Wexler, Anthony S., Bhave, Prakash V., Tonnesen, Gail S.

“…This note presents a straightforward method to correct sea-salt-emission particle-size distributions according to local relative humidity. The proposed method…”
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Evaluating a Space-Based Indicator of Surface Ozone-NO x -VOC Sensitivity Over Midlatitude Source Regions and Application to Decadal Trends by Jin, Xiaomeng, Fiore, Arlene M, Murray, Lee T, Valin, Lukas C, Lamsal, Lok N, Duncan, Bryan, Boersma, K Folkert, De Smedt, Isabelle, Abad, Gonzalo Gonzalez, Chance, Kelly, Tonnesen, Gail S

“…Determining effective strategies for mitigating surface ozone (O ) pollution requires knowledge of the relative ambient concentrations of its precursors, NO ,…”
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Modeling NH 4 NO 3 Over the San Joaquin Valley During the 2013 DISCOVER-AQ Campaign by Kelly, James T, Parworth, Caroline L, Zhang, Qi, Miller, David J, Sun, Kang, Zondlo, Mark A, Baker, Kirk R, Wisthaler, Armin, Nowak, John B, Pusede, Sally E, Cohen, Ronald C, Weinheimer, Andrew J, Beyersdorf, Andreas J, Tonnesen, Gail S, Bash, Jesse O, Valin, Luke C, Crawford, James H, Fried, Alan, Walega, James G

“…The San Joaquin Valley (SJV) of California experiences high concentrations of particulate matter NH NO during episodes of meteorological stagnation in winter…”
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Assessment of progress toward regional haze rule visibility goals using United States anthropogenic emissions rate of progress by Morris, Ralph, Tonnesen, Gail, Brewer, Pat, Moore, Tom, Rodriguez, Marco

“…The U.S. EPA developed the Regional Haze Rule to address Section 7491 of the 1977 Clean Air Act Amendments to prevent any future and remedy any existing…”
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Future year (2028) source apportionment modeling to support Regional Haze Rule planning in the western U.S by Barna, Michael, Morris, Ralph, Brewer, Patricia, Moore, Tom, Tonnesen, Gail, Briggs, Kevin

“…The Western Regional Air Partnership (WRAP) has developed a modeling platform to simulate the formation of haze-causing particles that impact…”
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Effects of uncertainty in the reaction of the hydroxyl radical with nitrogen dioxide on model-simulated ozone control strategies by Tonnesen, Gail S.

“…We evaluated the effect of a 20% reduction in the rate constant of the reaction of the hydroxyl radical with nitrogen dioxide to produce nitric acid (OH+NO…”
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Coupling between Chemical and Meteorological Processes under Persistent Cold-Air Pool Conditions: Evolution of Wintertime PM2.5 Pollution Events and N2O5 Observations in Utah’s Salt Lake Valley by Baasandorj, Munkhbayar, Hoch, Sebastian W, Bares, Ryan, Lin, John C, Brown, Steven S, Millet, Dylan B, Martin, Randal, Kelly, Kerry, Zarzana, Kyle J, Whiteman, C. David, Dube, William P, Tonnesen, Gail, Jaramillo, Isabel Cristina, Sohl, John

“…The Salt Lake Valley experiences severe fine particulate matter pollution episodes in winter during persistent cold-air pools (PCAPs). We employ measurements…”
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Revisiting day-of-week ozone patterns in an era of evolving US air quality by Simon, Heather, Hogrefe, Christian, Whitehill, Andrew, Foley, Kristen M, Liljegren, Jennifer, Possiel, Norm, Wells, Benjamin, Henderson, Barron H, Valin, Lukas C, Tonnesen, Gail, Appel, K. Wyat, Koplitz, Shannon

“…Past work has shown that traffic patterns in the USA and resulting NOx emissions vary by day of week, with NOx emissions typically being higher on weekdays…”
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Air pollutant source characterization using the revised regional haze tracking metric and a photochemical grid model and implications for regional haze planning by Brewer, Patricia, Tonnesen, Gail, Morris, Ralph, Moore, Tom, Nopmongcol, Uarporn, Miller, Debra

“…The 2017 revisions to the Regional Haze Rule clarify that visibility progress at Class I national parks and wilderness areas should be tracked on days with the…”
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CMAQ/CAMx annual 2002 performance evaluation over the eastern US by Tesche, T.W., Morris, Ralph, Tonnesen, Gail, McNally, Dennis, Boylan, James, Brewer, Patricia

“…Operational, diagnostic, and comparative evaluations of two one-atmosphere regional models were performed for the full calendar year 2002 in support of…”
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Coupling between Chemical and Meteorological Processes under Persistent Cold-Air Pool Conditions: Evolution of Wintertime PM^sub 2.5^ Pollution Events and N^sub 2^O^sub 5^ Observations in Utah's Salt Lake Valley by Baasandorj, Munkhbayar, Hoch, Sebastian W, Bares, Ryan, Lin, John C, Brown, Steven S, Millet, Dylan B, Martin, Randal, Kelly, Kerry, Zarzana, Kyle J, Whiteman, C David, Dube, William P, Tonnesen, Gail, Jaramillo, Isabel Cristina, Sohl, John

“…The Salt Lake Valley experiences severe fine particulate matter pollution episodes in winter during persistent cold-air pools (PCAPs). We employ measurements…”
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