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Chemical Insights into the Molecular Composition of Organic Aerosols in the Urban Region of Houston, Texas

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    Chemical Insights into the Molecular Composition of Organic Aerosols in the Urban Region of Houston, Texas
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    • Tania Gautam
      Tania Gautam
      Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory (PNNL), Richland, Washington 99352, United States
      Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
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      Orcidhttps://orcid.org/0000-0002-9075-3799
    • Gregory W. Vandergrift
      Gregory W. Vandergrift
      Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory (PNNL), Richland, Washington 99352, United States
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      Orcidhttps://orcid.org/0000-0002-8962-9897
    • Nurun Nahar Lata
      Nurun Nahar Lata
      Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory (PNNL), Richland, Washington 99352, United States
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    • Zezhen Cheng
      Zezhen Cheng
      Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory (PNNL), Richland, Washington 99352, United States
      More by Zezhen Cheng
      Orcidhttps://orcid.org/0000-0001-6320-4519
    • Ashfiqur Rahman
      Ashfiqur Rahman
      Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory (PNNL), Richland, Washington 99352, United States
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    • Annalisa Minke
      Annalisa Minke
      Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory (PNNL), Richland, Washington 99352, United States
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    • Zhenli Lai
      Zhenli Lai
      Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory (PNNL), Richland, Washington 99352, United States
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      Orcidhttps://orcid.org/0000-0003-0552-7605
    • Darielle N. Dexheimer
      Darielle N. Dexheimer
      Sandia National Laboratories, Albuquerque, New Mexico 87123, United States
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    • Damao Zhang
      Damao Zhang
      Atmospheric, Climate, and Earth Sciences Division, Pacific Northwest National Laboratory (PNNL), Richland, Washington 99352, United States
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    • Matthew A. Marcus
      Matthew A. Marcus
      Advanced Light Source, Lawrence Berkeley Lab, Berkeley, California 94720, United States
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    • Maria A. Zawadowicz
      Maria A. Zawadowicz
      Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, New York 11973, United States
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      Orcidhttps://orcid.org/0000-0003-4234-0954
    • Chongai Kuang
      Chongai Kuang
      Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, New York 11973, United States
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    • Ran Zhao
      Ran Zhao
      Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
      More by Ran Zhao
      Orcidhttps://orcid.org/0000-0002-1096-7632
    • Allison L. Steiner
      Allison L. Steiner
      Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
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      Orcidhttps://orcid.org/0000-0002-3823-1512
    • Swarup China*
      Swarup China
      Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory (PNNL), Richland, Washington 99352, United States
      *E-mail: [email protected]
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      Orcidhttps://orcid.org/0000-0001-7670-335X
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    ACS ES&T Air

    Cite this: ACS EST Air 2024, 1, 10, 1304–1316
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsestair.4c00141
    Published July 27, 2024
    Copyright © 2024 American Chemical Society
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    Abstract

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    Molecular functional groups, such as organosulfates (CHOS) and organonitrates (CHNO) are important tracers for field observations of secondary organic aerosols (SOA). While CHOS and CHNO are prevalent in the atmosphere, there is a lack of knowledge regarding daily and day- and night-time variations in these species in the urban atmosphere. Meteorological factors such as wind speed/direction, relative humidity (RH), and temperature can influence the formation of CHOS/CHNO. To investigate these trends, we utilized multimodal chemical imaging and advanced high resolution mass spectrometry techniques to acquire particle speciation and molecular formulas (MFs) associated with day and night sampling periods. Back trajectory analyses revealed the oceanic influence of southern wind airmasses in later June sampling periods with organic fractions <10%. Conversely, northern winds in early June sampling periods contributed to the episodic emergence of extremely low volatile organics (ELVOCs) and organic factions up to 41%. The observed unique MFs to June 3 (223 MFs) and to June 4 (144 MFs) were largely found to be of biogenic rather than anthropogenic origin. Our findings reveal episodic prevalence and temporal distribution of SOA constituents across the urban region of Houston, Texas.

    Copyright © 2024 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsestair.4c00141.

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    ACS ES&T Air

    Cite this: ACS EST Air 2024, 1, 10, 1304–1316
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsestair.4c00141
    Published July 27, 2024
    Copyright © 2024 American Chemical Society
    Request reuse permissions

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