Results are presented
from recent evaluations of multiple “LoFlo” CO2 analysers. These
experiments were conducted at both an urban site (Aspendale, a suburb of Melbourne, Australia),
and the Cape Grim baseline site. Figure 1 shows the
preliminary results from an overlap experiment involving two LoFlo analysers (identified
here as LoFlo-2A, and LoFlo-2B, each one operating with its own suite of
calibration gases) measuring marine boundary layer air from a shared single air
intake at the Cape Grim Baseline Air Pollution Station, in northwest Tasmania,
during April/May 2005. The figure shows the differences between hourly CO2
values from the two analysers, during those periods when baseline conditions
were experienced. The seven high pressure, CO2-in-dry air
calibration standards used for the LoFlo-2B system have been calibrated at the Carbon
Cycle Gases Group (CCGG), United States National Oceanic and Atmospheric
Administration (NOAA), Climate Monitoring and Diagnostics Laboratory (CMDL),
designated by the World Meteorological Organization (WMO) as the CO2
Central Calibration Laboratory.
Author: M.V. van der Schoot, L.P. Steele, R.J. Francey, et al (marcel dot vanderschoot at csiro dot au)
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