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Title: Long-term urban carbon dioxide observations reveal spatial and temporal dynamics related to urban characteristics and growth

Cities are concentrated areas of CO 2 emissions and have become the foci of policies for mitigation actions. However, atmospheric measurement networks suitable for evaluating urban emissions over time are scarce. Here we present a unique long-term (decadal) record of CO 2 mole fractions from five sites across Utah’s metropolitan Salt Lake Valley. We examine “excess” CO 2 above background conditions resulting from local emissions and meteorological conditions. We ascribe CO 2 trends to changes in emissions, since we did not find longterm trends in atmospheric mixing proxies. Three contrasting CO 2 trends emerged across urban types: negative trends at a residentialindustrial site, positive trends at a site surrounded by rapid suburban growth, and relatively constant CO 2 over time at multiple sites in the established, residential, and commercial urban core. Analysis of populationwithin the atmospheric footprints of the different sites reveals approximately equal increases in population influencing the observed CO 2, implying a nonlinear relationshipwith CO 2 emissions: Population growth in rural areas that experienced suburban development was associated with increasing emissions while population growth in the developed urban core was associated with stable emissions. Four state-of-the-art global-scale emission inventories also have a nonlinear relationship with population density acrossmore » the city; however, in contrast to our observations, they all have nearly constant emissions over time. Our results indicate that decadal scale changes in urban CO 2 emissions are detectable through monitoring networks and constitute a valuable approach to evaluate emission inventories and studies of urban carbon cycles.« less
Authors:
ORCiD logo [1] ; ORCiD logo [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1] ;  [1] ; ORCiD logo [3] ;  [1] ;  [1] ;  [4] ;  [5] ;  [1]
  1. Univ. of Utah, Salt Lake City, UT (United States)
  2. Univ. of Washington, Seattle, WA (United States)
  3. National Center for Atmospheric Research, Boulder, CO (United States)
  4. Univ. of Utah, Salt Lake City, UT (United States); Univ. of Hawaii at Manoa, Honolulu, HI (United States)
  5. Arizona State Univ., Tempe, AZ (United States)
Publication Date:
Grant/Contract Number:
SC0010625; SC0010624; FG02-04ER63904; SC0005236
Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 115; Journal Issue: 12; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Research Org:
Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23). Climate and Environmental Sciences Division; USDOE
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES
OSTI Identifier:
1423734
Alternate Identifier(s):
OSTI ID: 1425443; OSTI ID: 1425455

Mitchell, Logan E., Lin, John C., Bowling, David R., Pataki, Diane E., Strong, Courtenay, Schauer, Andrew J., Bares, Ryan, Bush, Susan E., Stephens, Britton B., Mendoza, Daniel, Mallia, Derek, Holland, Lacey, Gurney, Kevin R., and Ehleringer, James R.. Long-term urban carbon dioxide observations reveal spatial and temporal dynamics related to urban characteristics and growth. United States: N. p., Web. doi:10.1073/pnas.1702393115.
Mitchell, Logan E., Lin, John C., Bowling, David R., Pataki, Diane E., Strong, Courtenay, Schauer, Andrew J., Bares, Ryan, Bush, Susan E., Stephens, Britton B., Mendoza, Daniel, Mallia, Derek, Holland, Lacey, Gurney, Kevin R., & Ehleringer, James R.. Long-term urban carbon dioxide observations reveal spatial and temporal dynamics related to urban characteristics and growth. United States. doi:10.1073/pnas.1702393115.
Mitchell, Logan E., Lin, John C., Bowling, David R., Pataki, Diane E., Strong, Courtenay, Schauer, Andrew J., Bares, Ryan, Bush, Susan E., Stephens, Britton B., Mendoza, Daniel, Mallia, Derek, Holland, Lacey, Gurney, Kevin R., and Ehleringer, James R.. 2018. "Long-term urban carbon dioxide observations reveal spatial and temporal dynamics related to urban characteristics and growth". United States. doi:10.1073/pnas.1702393115.
@article{osti_1423734,
title = {Long-term urban carbon dioxide observations reveal spatial and temporal dynamics related to urban characteristics and growth},
author = {Mitchell, Logan E. and Lin, John C. and Bowling, David R. and Pataki, Diane E. and Strong, Courtenay and Schauer, Andrew J. and Bares, Ryan and Bush, Susan E. and Stephens, Britton B. and Mendoza, Daniel and Mallia, Derek and Holland, Lacey and Gurney, Kevin R. and Ehleringer, James R.},
abstractNote = {Cities are concentrated areas of CO2 emissions and have become the foci of policies for mitigation actions. However, atmospheric measurement networks suitable for evaluating urban emissions over time are scarce. Here we present a unique long-term (decadal) record of CO2 mole fractions from five sites across Utah’s metropolitan Salt Lake Valley. We examine “excess” CO2 above background conditions resulting from local emissions and meteorological conditions. We ascribe CO2 trends to changes in emissions, since we did not find longterm trends in atmospheric mixing proxies. Three contrasting CO2 trends emerged across urban types: negative trends at a residentialindustrial site, positive trends at a site surrounded by rapid suburban growth, and relatively constant CO2 over time at multiple sites in the established, residential, and commercial urban core. Analysis of populationwithin the atmospheric footprints of the different sites reveals approximately equal increases in population influencing the observed CO2, implying a nonlinear relationshipwith CO2 emissions: Population growth in rural areas that experienced suburban development was associated with increasing emissions while population growth in the developed urban core was associated with stable emissions. Four state-of-the-art global-scale emission inventories also have a nonlinear relationship with population density across the city; however, in contrast to our observations, they all have nearly constant emissions over time. Our results indicate that decadal scale changes in urban CO2 emissions are detectable through monitoring networks and constitute a valuable approach to evaluate emission inventories and studies of urban carbon cycles.},
doi = {10.1073/pnas.1702393115},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 12,
volume = 115,
place = {United States},
year = {2018},
month = {3}
}