Scripps CO2 program graphics on keelingcurve.ucsd.edu are licensed under a CC BY license, Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which clarifies appropriate uses and requirements. The graphics must be credited to the Scripps Institution of Oceanography at UC San Diego. For graphics which show ice-core data, additional credit must be given for these products, as appropriate for that source (see below).
For applications supporting peer-reviewed scientific publications, ethical usage may also require disclosing intentions at early stages to avoid duplicating ongoing studies at Scripps or elsewhere. For such applications, coauthorship may sometimes be appropriate. An example would be if an important result or conclusion depends on this product, such as the first account of a previously unreported phenomenon.
The graphics referred to here are the plots displayed on the front page and located at PDF Downloads.
MLO data from the most recent month is preliminary
Mauna Loa carbon dioxide data from the most recent month is preliminary and subject to subsequence updates to account for retrospective calibration and quality control. See scrippsco2.ucsd.edu for data that has passed these routine quality checks and updates. The datasets are archived once a month on the scrippsco2.ucsd.edu website and the Scripps CO2 Program library archive database at UCSD.
CO2 data starting in 1958 are from the Scripps CO2 program
Citation: C. D. Keeling, S. C. Piper, R. B. Bacastow, M. Wahlen, T. P. Whorf, M. Heimann, and H. A. Meijer, Exchanges of atmospheric CO2 and 13CO2 with the terrestrial biosphere and oceans from 1978 to 2000. I. Global aspects, SIO Reference Series, No. 01-06, Scripps Institution of Oceanography, San Diego, 88 pages, 2001. http://escholarship.org/uc/item/09v319r9
CO2 data going back 2000 years
Citation: Rubino, Mauro; Etheridge, David; Thornton, David; Allison, Colin; Francey, Roger; Langenfelds, Ray; Steele, Paul; Trudinger, Cathy; Spencer, Darren; Curran, Mark; Van Ommen, Tas; Smith, Andrew (2019): Law Dome Ice Core 2000-Year CO2, CH4, N2O and d13C-CO2. v1. CSIRO. Data Collection. https://doi.org/10.25919/5bfe29ff807fb
CO2 data going back 800,000 years
Citation: Lüthi, D., M. Le Floch, B. Bereiter, T. Blunier, J.-M. Barnola, U. Siegenthaler, D. Raynaud, J. Jouzel, H. Fischer, K. Kawamura, and T.F. Stocker. 2008. High-resolution carbon dioxide concentration record 650,000-800,000 years before present. Nature, Vol. 453, pp. 379-382, 15 May 2008.
CO2 data going back 70 million years
Description: The 70M Years plot uses paleo-CO2 data that have been assembled and curated by an international group of proxy experts. The combined file is used and the CO2 data is restricted to data points with a maximum uncertainty of 25%.
Citation: Baerbel Hoenisch. (2021). Paleo-CO2 data archive (Version 1) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.5777278