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

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.

doi:10.1073/pnas.1702393115

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

2018
By Mitchell, Logan E. ; Lin, John C. ; Bowling, David R. ; ...
Source: PNAS 115 (12) 2912-2917; https://doi.org/10.1073/pnas.1702393115

[PDF-2.03 MB]

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Details:

Journal Title:

Proceedings of the National Academy of Sciences of the United States of America
Personal Author:

Mitchell, Logan E. ; Lin, John C. ; Bowling, David R. ; Pataki, Diane E. ; Strong, Courtenay ; ... More +

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. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) ; ESRL (Earth System Research Laboratory)

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) ; ESRL (Earth System Research Laboratory) Less -
Description:

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 long-term trends in atmospheric mixing proxies. Three contrasting CO2 trends emerged across urban types: negative trends at a residential-industrial 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 population within the atmospheric footprints of the different sites reveals approximately equal increases in population influencing the observed CO2, implying a nonlinear relationship with 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."
Keywords:

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Benefits Carbon Dioxide Cities Cycle Drivers Emissions Fuel Co2 Emissions Greenhouse Gas Quantification Scale Science Technology Trends Urban Verification
Source:

PNAS 115 (12) 2912-2917; https://doi.org/10.1073/pnas.1702393115
DOI:

https://doi.org/10.1073/pnas.1702393115
Pubmed ID:

29507190
Pubmed Central ID:

PMC5866532
Document Type:

Journal Article
Funding:

Grant no. NA14OAR4310178 ; Grant no. NA09OAR4310064

Grant no. NA14OAR4310178 ; Grant no. NA09OAR4310064 Less -
Rights Information:

Other
Compliance:

PMC
Main Document Checksum:

[+]

urn:sha256:68905c61ac4f825b3311720ef8cd0b4db618dfd13749c59f59680cc19a2143b9
Download URL:

https://repository.library.noaa.gov/view/noaa/29214/noaa_29214_DS1.pdf
File Type:

	air.utah.edu	htm
	Available dataset	htm
	Available dataset	htm
	carbontracker	htm
	RACCOON	htm

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