ICOS follows a two-pronged radiocarbon sampling strategy.
To track long-term changes in the large-scale European
atmospheric fossil fuel CO2 burden,
two-weekly integrated samples are analyzed.
These measurements are complemented by spot samples that allow
to determine the fossil CO2 content of a specific air mass.
A large share of the integrated samples is analyzed using gas proportional counters.
These conventional samples require a CO2
which is contained in approximately 20 m3
The atmospheric CO2
is sampled by chemical absorption
-free NaOH solution over the course of two weeks. CO2
absorption takes place in so called Raschig-tube samplers,
which have been originally developed for atmospheric 14
the 1970s (Levin et al., 1980
The samplers have proven very reliable and robust and are also used in the Heidelberg
sampling network (Levin et al., 2010
The CRL has the capacity of building four to six samplers
per year for the ICOS atmospheric station network at cost-price.
Requests should be made to Ingeborg Levin
Low-volume integrated samplers for 14
analysis by AMS are currently under development.