Provided by: Ray Leuning on 05/13/2010
My first comment is that these sensors are not sufficiently accurate or precise to give you good profile information unless the concentration within the canopy is substantially greater than background during the periods of interest i.e. >> than 8 ppm resolution. However, these problems can be minimized by comparing the sensors at the same height over a range of temperatures to obtain relative calibrations. Such a comparison may be sufficient for evaluating the change in storage term of the mass balance.
I have just placed an order for 8 sensors for another purpose. I will be comparing their performance to an FTIR spectrometer for several weeks/months and will also do an intensive set of calibrations in the lab to determine their accuracy, precision and temperature sensitivity. I plan to publish the results in due course.