Browsing by Author "Martin, Scot"

Now showing items 1-14 of 14

    • The 1-by-3 Tandem Differential Mobility Analyzer for Measurement of the Irreversibility of the Hygroscopic Growth Factor 

      Rosenoern, T.; Paulsen, D.; Martin, Scot (Taylor & Francis Ltd, 2009)
      A new instrument, namely the 1 × 3 tandem differential mobility analyzer (1 × 3-TDMA), has been developed. Its primary measurement is the irreversibility of the hygroscopic growth factor of aerosol particles. The instrument ...

    • The Connection between Microphysical Morphology and Atmospheric Particle Phase Transitions 

      Smith, Mackenzie Lynn (2013-02-11)
      The phase of atmospheric particles can influence heterogeneous chemistry, cloud formation, and radiative forcing. Sulfate particles ranging from sulfuric acid to ammonium sulfate are the largest contributor arising from ...

    • Enhanced aerosol particle growth sustained by high continental chlorine emission in India 

      Gunthe, Sachin S.; Liu, Pengfei; Panda, Upasana; Raj, Subha S.; Sharma, Amit; Darbyshire, Eoghan; Reyes-Villegas, Ernesto; Allan, James; Chen, Ying; Wang, Xuan; Song, Shaojie; Pöhlker, Mira L.; Shi, Liuhua; Wang, Yu; Kommula, Snehitha M.; Liu, Tianjia; Ravikrishna, R.; McFiggans, Gordon; Mickley, Loretta; Martin, Scot; Pöschl, Ulrich; Andreae, Meinrat O.; Coe, Hugh; Coe (Springer Science and Business Media LLC, 2021-01-25)
      Many cities in India experience severe deterioration of air quality in winter. Particulate matter is a key atmospheric pollutant that impacts millions of people. In particular, high levels of particulate matter reduce ...

    • Fluorescence Aerosol Flow Tube Spectroscopy to Detect Liquid–Liquid Phase Separation 

      Ohno, Paul; Qin, Yi Ming; Ye, Jianhuai; Wang, Junfeng; Bertram, Allan; Martin, Scot (American Chemical Society (ACS), 2021-05-06)
      The phase behavior of atmospheric aerosol particles influences processes like gas-particle partitioning, solar light scattering, and cloud formation, ultimately affecting atmospheric air quality and climate. An important ...

    • Global Distribution of Solid and Aqueous Sulfate Aerosols: Effect of the Hysteresis of Particle Phase Transitions 

      Wang, Jun; Hoffmann, Andrew A.; Park, Rokjin J.; Jacob, Daniel; Martin, Scot (American Geophysical Union, 2008)
      The partitioning between solid and aqueous phases of tropospheric sulfate-ammonium particles is simulated with a global 3-D chemical transport model (CTM). The simulation explicitly accounts for the hysteresis of particle ...

    • Interfacial Forces are Modified by the Growth of Surface Nanostructures 

      Na, Chongzheng; Martin, Scot (American Chemical Society, 2008)
      Nanostructures formed by chemical reaction can modify the interfacial forces present in aqueous solution near a surface. This study uses force-volume microscopy to explore this phenomenon for the growth of manganese oxide ...

    • Isoprene Photooxidation via the Hydroperoxyl Pathway 

      Liu, Yingjun (2015-01-23)
      Photooxidation of isoprene has a large influence on the oxidation capacity of the atmosphere and is a significant source of secondary organic material (SOM) of atmospheric particles. A quantitative understanding of isoprene ...

    • Loading-Dependent Elemental Composition of α-pinene SOA Particles 

      Shilling, John E.; Chen, Qi; King, Stephanie M.; Rosenoern, Thomas; Kroll, Jesse H.; Worsnop, Douglas R.; DeCarlo, Peter F.; Aiken, Allison C.; Sueper, Donna; Jimenez, Jose L.; Martin, Scot (Copernicus Publications, 2009)
      The chemical composition of secondary organic aerosol (SOA) particles, formed by the dark ozonolysis of α-pinene, was characterized by a high-resolution time-of-flight aerosol mass spectrometer. The experiments were conducted ...

    • Phase Changes of Ambient Particles in the Southern Great Plains of Oklahoma 

      Martin, Scot; Rosenoern, Thomas; Chen, Qi; Collins, Donald R. (American Geophysical Union, 2008)
      A new instrument, a 1 × 3 tandem differential mobility analyzer (1 × 3-TDMA), was deployed in June 2007 in the Southern Great Plains, Oklahoma, USA to study the phase of ambient particles. Its primary measurement, the ...

    • The Physicochemical Properties of Secondary Organic Materials 

      Zhang, Yue (2015-05-20)
      The physicochemical properties of the secondary organic materials (SOMs) that constitute the particle phase have potentially important consequences for the growth, the reactivity, and ultimate fate of atmospheric organic ...

    • Rapid growth of anthropogenic organic nanoparticles greatly alters cloud life cycle in the Amazon rainforest 

      Zaveri, Rahul A.; Wang, Jian; Fan, Jiwen; Zhang, Yuwei; Shilling, John E.; Zelenyuk, Alla; Mei, Fan; Newsom, Rob; Pekour, Mikhail; Tomlinson, Jason; Comstock, Jennifer M.; Shrivastava, Manish; Fortner, Edward; Machado, Luiz A. T.; Artaxo, Paulo; Martin, Scot (American Association for the Advancement of Science (AAAS), 2022-01-14)
      <jats:p>Oxidation products of natural hydrocarbons rapidly grow pollution nanoparticles to sizes large enough to alter clouds.</jats:p>

    • Sensitivity of Sulfate Direct Climate Forcing to the Hysteresis of Particle Phase Transitions 

      Wang, Jun; Jacob, Daniel; Martin, Scot (American Geophysical Union, 2008)
      The effects of solid-aqueous phase transitions on sulfate direct climate forcing (SDCF) are investigated by using both a column model and a global chemical transport model. Aqueous particles have a larger mass extinction ...

    • Vertical Profiling of Fine Particulate Matter and Black Carbon by Using Unmanned Aerial Vehicle in Macau, China 

      Liu, Ben; Wu, Cheng; Ma, Nan; Ye, Jianhuai; Lin, Yong Jie; Chen, Qi; Martin, Scot; Li, Yaowei (Elsevier BV, 2020-03)
      An unmanned aerial vehicle 1 (UAV) equipped with miniature monitors was used to study the vertical profiles of PM2.5 (particulate matter [PM] with a ≤2.5-μm diameter) and black carbon (BC) in Macau, China, from the surface ...

    • Water Uptake by NaCl Particles Prior to Deliquescence and the Phase Rule 

      Wise, Matthew E.; Martin, Scot; Russell, Lynn M.; Buseck, Peter R. (Taylor & Francis, 2008)
      Using an environmental transmission electron microscope (ETEM), we show that a significant amount of water, far exceeding the multilayers caused by surface adsorption, is reversibly associated prior to deliquescence with ...