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Title: The Wintertime Covariation of CO 2 and Criteria Pollutants in an Urban Valley of the Western United States

Abstract

Numerous mountain valleys experience wintertime particulate pollution events, when persistent cold air pools (PCAPs) develop and inhibit atmospheric mixing, leading to the accumulation of pollutants. Here we examine the relationships between trace gases and criteria pollutants during winter in Utah’s Salt Lake Valley, in an effort to better understand the roles of transport versus chemical processes during differing meteorological conditions as well as insights into how targeted reductions in greenhouse gases will impact local air quality in varying meteorological conditions. CO 2 is a chemically inert gas that is coemitted during fossil fuel combustion with pollutants. Many of these coemitted pollutants are precursors that react chemically to form secondary particulate matter. Thus, CO 2 can serve as a stable tracer and potentially help distinguish transport versus chemical influences on pollutants. During the winter of 2015–2016, we isolated enhancements in CO 2 over baseline levels due to urban emissions (“CO 2ex”). CO 2ex was paired with similar excesses in other pollutant concentrations. These relationships were examined during different wintertime conditions and stages of pollution episodes: (a) Non-PCAP, (b) beginning, and (c) latter stages of an episode. We found that CO 2ex is a good indicator of the presence of gaseous criteriamore » pollutants and a reasonable indicator of PM2.5. Additionally, the relationships between CO 2ex and criteria pollutants differ during different phases of PCAP events which provide insight into meteorological and transport processes. Lastly, we found a slight overestimation of CO:CO 2 emission ratios and a considerable overestimation of NO x:CO 2 by existing inventories for the Salt Lake Valley.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [2];  [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [3]
  1. Univ. of Utah, Salt Lake City, UT (United States)
  2. Univ. of Utah, Salt Lake City, UT (United States); Utah Department of Environmental Quality, Salt Lake City, UT (United States)
  3. National Center for Atmospheric Research, Boulder, CO (United States)
Publication Date:
Research Org.:
Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1537326
Alternate Identifier(s):
OSTI ID: 1462771
Grant/Contract Number:  
SC0010624; DESC0010624
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research: Atmospheres
Additional Journal Information:
Journal Volume: 123; Journal Issue: 5; Journal ID: ISSN 2169-897X
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Meteorology & Atmospheric Sciences

Citation Formats

Bares, Ryan, Lin, John C., Hoch, Sebastian W., Baasandorj, Munkhbayar, Mendoza, Daniel L., Fasoli, Ben, Mitchell, Logan, Catharine, Douglas, and Stephens, Britton B. The Wintertime Covariation of CO2 and Criteria Pollutants in an Urban Valley of the Western United States. United States: N. p., 2018. Web. doi:10.1002/2017jd027917.
Bares, Ryan, Lin, John C., Hoch, Sebastian W., Baasandorj, Munkhbayar, Mendoza, Daniel L., Fasoli, Ben, Mitchell, Logan, Catharine, Douglas, & Stephens, Britton B. The Wintertime Covariation of CO2 and Criteria Pollutants in an Urban Valley of the Western United States. United States. doi:10.1002/2017jd027917.
Bares, Ryan, Lin, John C., Hoch, Sebastian W., Baasandorj, Munkhbayar, Mendoza, Daniel L., Fasoli, Ben, Mitchell, Logan, Catharine, Douglas, and Stephens, Britton B. Fri . "The Wintertime Covariation of CO2 and Criteria Pollutants in an Urban Valley of the Western United States". United States. doi:10.1002/2017jd027917. https://www.osti.gov/servlets/purl/1537326.
@article{osti_1537326,
title = {The Wintertime Covariation of CO2 and Criteria Pollutants in an Urban Valley of the Western United States},
author = {Bares, Ryan and Lin, John C. and Hoch, Sebastian W. and Baasandorj, Munkhbayar and Mendoza, Daniel L. and Fasoli, Ben and Mitchell, Logan and Catharine, Douglas and Stephens, Britton B.},
abstractNote = {Numerous mountain valleys experience wintertime particulate pollution events, when persistent cold air pools (PCAPs) develop and inhibit atmospheric mixing, leading to the accumulation of pollutants. Here we examine the relationships between trace gases and criteria pollutants during winter in Utah’s Salt Lake Valley, in an effort to better understand the roles of transport versus chemical processes during differing meteorological conditions as well as insights into how targeted reductions in greenhouse gases will impact local air quality in varying meteorological conditions. CO2 is a chemically inert gas that is coemitted during fossil fuel combustion with pollutants. Many of these coemitted pollutants are precursors that react chemically to form secondary particulate matter. Thus, CO2 can serve as a stable tracer and potentially help distinguish transport versus chemical influences on pollutants. During the winter of 2015–2016, we isolated enhancements in CO2 over baseline levels due to urban emissions (“CO2ex”). CO2ex was paired with similar excesses in other pollutant concentrations. These relationships were examined during different wintertime conditions and stages of pollution episodes: (a) Non-PCAP, (b) beginning, and (c) latter stages of an episode. We found that CO2ex is a good indicator of the presence of gaseous criteria pollutants and a reasonable indicator of PM2.5. Additionally, the relationships between CO2ex and criteria pollutants differ during different phases of PCAP events which provide insight into meteorological and transport processes. Lastly, we found a slight overestimation of CO:CO2 emission ratios and a considerable overestimation of NOx:CO2 by existing inventories for the Salt Lake Valley.},
doi = {10.1002/2017jd027917},
journal = {Journal of Geophysical Research: Atmospheres},
number = 5,
volume = 123,
place = {United States},
year = {2018},
month = {2}
}

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