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Carbon and oxygen isotope ratios of atmospheric carbon dioxide in the Salt Lake Valley, Utah, 2001-2011

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Created: May 22, 2017 at 10:40 p.m.
Last updated: May 22, 2017 at 11:30 p.m.
DOI: 10.4211/hs.64e1c0f40d124b1c9d342ce421c2f7be
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Stable isotope ratio data are useful in understanding biosphere-atmosphere fluxes and the roles of different sources contributing to these fluxes. The carbon isotope ratio data are useful in understanding aspects of the carbon cycle, while oxygen isotope ratios provide information about the vegetation and the water cycle.

Presented here are long-term observations of the carbon and oxygen isotope ratios and concentrations of atmospheric carbon dioxide measured in an urban setting. These data These Salt Lake City observations were made on the roof of a 4-story building at the University of Utah campus (latitude 40.76348 degrees north, longitude -111.84834 degrees west, 1820 meters elevation). Current carbon dioxide concentration data streams can be obtained online at

These methods used in data collection, data analyses, and quality control can be found in the following publications:

Pataki, D. E., D. R. Bowling, and J. R. Ehleringer (2003), Seasonal cycle of carbon dioxide and its isotopic composition in an urban atmosphere: Anthropogenic and biogenic effects, Journal of Geophysical Research-Atmospheres, 108(D23).

Pataki, D. E., T. Xu, Y. Q. Luo, and J. R. Ehleringer (2007), Inferring biogenic and anthropogenic carbon dioxide sources across an urban to rural gradient, Oecologia, 152(2), 307–322.

These data are used in the following publication:
B. Raczka, S. C. Biraud, J. R. Ehleringer, C. Lai, J. B. Miller, D. E. Pataki, S. Saleska, M. S. Torn, B. H. Vaughn, R. Wehr, D. R. Bowling. 2017. Does vapor pressure deficit drive the seasonality of δ13C of the net land-atmosphere CO2 exchange across the United States? Journal of Geophysical Research Biogeosciences

All stable isotope ratio analyses were conducted at Utah’s Stable Isotope Ratio Facility for Environmental Research (SIRFER,

The carbon dioxide concentration data are presented as parts per million (ppm). The carbon isotope ratio of atmospheric carbon dioxide are presented as per mil relative to the PDB international standard. The oxygen isotope ratio of atmospheric carbon dioxide are presented as per mil relative to the SMOW international standard.

Data flag information:

-2, discard for 18O only
-1, discard for 13C only
0, good data
1, low pressure - suspect
2, bad fill suspected
3, low pressure - discard
4, bad fill - discard
5, discard other (use if both -1 and -2 apply)
6, suspect other (bad run on the mass spec)

1, morning rush hour
2, evening rush hour
3, nighttime
4, diurnal

Subject Keywords



Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees


Start Date:
End Date:



Funding Agencies

This resource was created using funding from the following sources:
Agency Name Award Title Award Number
Department of Energy Confronting models with regional CO2 observations DE-SC-001-0624

How to Cite

Ehleringer, J. (2017). Carbon and oxygen isotope ratios of atmospheric carbon dioxide in the Salt Lake Valley, Utah, 2001-2011, HydroShare,

This resource is shared under the Creative Commons Attribution CC BY.


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