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Data from: Seasonally varying contributions to urban CO2 in the Chicago, IL, USA region: insights from a high-resolution CO2 concentration and δ13C record

Moore, Joel; Jacobson, Andrew D.

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  "DOI": "10.5061/dryad.h8d0n", 
  "author": [
      "family": "Moore, Joel"
      "family": "Jacobson, Andrew D."
  "issued": {
    "date-parts": [
  "abstract": "Understanding urban carbon cycling is essential given that cities sustain 54% of the global population and contribute 70% of anthropogenic CO2 emissions. When combined with CO2 concentration measurements ([CO2]), stable carbon isotope analyses (\u03b413C) can differentiate sources of CO2, including ecosystem respiration and combustion of fossil fuels, such as petroleum and natural gas. In this study, we used a wavelength scanned-cavity ringdown spectrometer to collect ~2x106 paired measurements for [CO2] and \u03b413C values in Evanston, IL for August 2011 through February 2012. Evanston is located immediately north of Chicago, IL, the third largest city in the United States. The measurements represent one of the longest records of urban [CO2] and \u03b413C values thus far reported. We also compiled local meteorological information, as well as complementary [CO2] and \u03b413C data for background sites in Park Falls, WI and Mauna Loa, HI. We use the dataset to examine how ecosystem processes, fossil fuel usage, wind speed, and wind direction control local atmospheric [CO2] and \u03b413C in a midcontinent urban setting on a seasonal to daily basis. On average, [CO2] and \u03b413C values in Evanston were 16\u201323 ppm higher and 0.97\u20131.13\u2030 lower than the background sites. While seasonal [CO2] and \u03b413C values generally followed broader northern hemisphere trends, the difference between Evanston and the background sites was larger in winter versus summer. Mixing calculations suggest that ecosystem respiration and petroleum combustion equally contributed CO2 in excess of background during the summer and that natural gas combustion contributed 80%\u201394% of the excess CO2 in winter. Wind speed and direction strongly influenced [CO2] and \u03b413C values on an hourly time scale. The highest [CO2] and lowest \u03b413C values occurred at wind speeds <3 m s\u22121 and when winds blew from the northwest, west, and south over densely populated neighborhoods.", 
  "title": "Data from: Seasonally varying contributions to urban CO2 in the Chicago, IL, USA region: insights from a high-resolution CO2 concentration and \u03b413C record", 
  "note": "<div class=\"o-metadata__file-usage-entry\">moore_jacobson_co2_d13C_meteo_data<div class=\"o-metadata__file-description\">This file contains hourly averages for concentrations and d13C of atmospheric CO2 measured in Evanston, IL from Aug. 2011 to early March 2012. Concentration and d13C values were measured with a Picarro G1101-i wavelength scanned-cavity ring down spectrometer. Wind direction, wind speed, and other supporting meteorological data are from the Illinois Environmental Protection Agency and the US National Weather Service. For more information, see the ReadMe file.</div><div class=\"o-metadata__file-name\"></div><div class=\"o-metadata__file-name\"></div></div>", 
  "type": "dataset", 
  "id": "5010256"
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