By Rebecca Washenfelder
The
Total Carbon Column Observing Network is a new network of ground-based solar
observatories, dedicated to column measurements of greenhouse gases. We present CO2 column abundances
observed in Park Falls, Wisconsin
and Lauder, New Zealand
during May 2004 – June 2005. In Park Falls, Wisconsin,
the peak-to-peak variation of column-average CO2 is approximately 13
ppmv. In Lauder, New Zealand, the peak-to-peak
variation of column-average CO2 is approximately 4 ppmv. Assuming a secular trend of 2 ppmv yr-1,
we infer a peak-to-peak seasonal amplitude of 11 ppmv and 2 ppmv for Park Falls
and Lauder respectively. These values
are higher than model predictions by Olsen and Randerson [2003].
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