

   co2 {base}                                   R Documentation

   MMaauunnaa LLooaa AAttmmoosspphheerriicc CCOO22 CCoonncceennttrraattiioonn

   DDeessccrriippttiioonn::

        Atmospheric concentrations of CO2 are expressed in
        parts per million (ppm) and reported in the preliminary
        1997 SIO manometric mole fraction scale.

   UUssaaggee::

        data(co2)

   FFoorrmmaatt::

        A time series of 468 observations; monthly from 1959 to
        1997.

   DDeettaaiillss::

        The values for February, March and April of 1964 were
        missing and have been obtained by interpolating lin-
        early between the values for January and May of 1964.

   SSoouurrccee::

        Keeling, C. D.  and T. P. Whorf, Scripps Institution of
        Oceanography (SIO), University of California, La Jolla,
        California USA 92093-0220.

        <URL: ftp://cdiac.esd.ornl.gov/pub/maunaloa-co2/mau-
        naloa.co2>.

   RReeffeerreenncceess::

        Cleveland, W. S. (1993).  Visualizing Data.  New Jer-
        sey: Summit Press.

   EExxaammpplleess::

        data(co2)
        plot(co2, ylab = expression("Atmospheric concentration of CO"[2]),
             las = 1)
        title(main = "co2 data set")

