Evaluation of 4 years of continuous &amp;lt;i&amp;gt;δ&amp;lt;/i&amp;gt;&amp;lt;sup&amp;gt;13&amp;lt;/sup&amp;gt;C(CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;) data using a moving Keeling plot method
Biogeosciences